Abstract: A method of coding stereo audio spectral values first carries out grouping of those values in scale factor bands, with which scale factors are associated. Sections are formed next, each comprising at least one scale factor band. The spectral values are coded within at least one section with a code book assigned to the section, out of a plurality of code books each with a code book number assigned to it, the number of the code book used being transmitted as side information to the coded stereo audio spectral values. At least one additional code book number is provided, which does not refer to a code book but shows information relevant to the section to which it is assigned. A method of decoding stereo audio spectral values which are partly coded by the intensity stereo process and which have side information uses the relevant information, showing the additional code book numbers, to cancel the existing coding of the stereo audio spectral values.

Abstract: A digital music broadcasting audio system and particularly a music broadcasting audio system to retrieve digital music information from different storage devices consists of a basic audio system structure (including at least a tape broadcasting device, a CD broadcasting device, a radio-receiving device, a front end processor, an audio selection switch, a back end amplifier and one or more speaker) to couple with a storage device input unit so that users can retrieve digital music information from different storage devices, and the audio system can broadcast digital music besides performing the function of broadcasting radio, CDs and cartridge tapes.

Abstract: A Bluetooth dongle is powered on and connected to a general audio output device such as an earphone. And, a device with Bluetooth function such as a Bluetooth PDA is positioned at another place that is at a distance from the audio output device. The earphone can receive audio signal from the PDA through the Bluetooth dongle after certification and paring procedures are done. Thereby, a set of dongles can be used in variable different devices. Consequently, a wire audio transmission can be easily achieved.

Abstract: A circuit arrangement reduces the number of interrupts to a DSP required to transfer digital samples between external I/O devices and a data memory, thus allowing the DSP to perform additional sample processing operations. An interrupt accelerator responds to I/O interrupts from an I/O device by pausing the DSP, transferring samples with the data memory, and tracking the number of samples transferred. When a predetermined number of samples have been transferred, the interrupt accelerator interrupts the DSP to perform a block transfer of samples in conjunction with sample processing.

Abstract: A method and system is disclosed for digitally demodulating an analog signal. In one example, the analog signal contains a L+R signal, a L−R signal centered around a carrier signal, and a pilot signal. An exemplary system for digitally demodulating such a signal includes an analog to digital converter, three digital filters, clock reconstitution circuitry, L−R signal recovery circuitry, and channel recovery circuitry. The analog to digital converter converts the analog signal into a digital signal. The three filters separate the L+R signal, the pilot signal, and the L−R signal from the digital signal. The clock reconstitution circuitry reconstitutes a clock signal from the separated pilot signal. The L−R signal recovery circuitry recovers the separated L−R signal using the reconstituted clock signal. The channel recovery circuitry recovers a left channel signal and a right channel signal from the separated L+R signal and the recovered L−R signal.

Abstract: A remote speaker system (14) for an automotive vehicle (10) has a holder (22) fixedly mounted within the vehicle (10). A speaker assembly (19) having a speaker housing (20) coupled to holder (22) and a speaker (26) coupled within the housing (20). A receive circuit (48) is coupled within the housing (20) and is electrically coupled to the speaker (26). A control circuit has an audio receiver generating audio signals and a transmit circuit (44) transmitting a wireless communication signal in response to the audio signal. The receive circuit (48) receives the wireless communication signal and converts the wireless communication signal into an audio electrical signal. The speaker converts the audio electrical signal into an audible signal.

Abstract: Described is a personal on-demand audio entertainment system with a base unit attached to a personal computer or other source, a headphone unit and a remote control unit. The base unit transmits digital audio content to the headphone unit using infrared, radio frequency, magnetic or electromagnetic coupling. These data are stored in solid-state memory within the headphone unit. In the headphone unit, the stored digital audio content is converted to analog audio signals, amplified and sent to transducers for conversion to audio signal for the listener during playback. The system is designed such that playback may occur during the downloading process. The remote control unit also uses infrared, radio frequency, magnetic or electromagnetic coupling for communication to the headphone unit. This communication is made using a different channel and does not interfere with the audio data downloading.

Abstract: A dual-mode receiver that functions both as a digital audio broadcast receiver and a solid-state digital audio content player is described. In a “radio” mode, the receiver is able to: receive a digital audio bitstream, decode the received bitstream, store or render the decoded bitstream either based on an input from a user or a pre-programmed instruction from a user. In a “play” mode, the receiver is able to access the stored digital audio content, or extract stored digital audio content from a compact media device (e.g., compact flash memory) that is interfaced with the receiver.

Abstract: An FM stereo signal demodulating apparatus includes a bandpass filter 1 for extracting a 19 Hz signal from an FM detected signal; a first phase shifter 21 for phase-shifting the 19 Hz signal by 90 degree; a first XOR 22 for taking an exclusive OR between an output from the first phase-shifter 21 and the 19 KHz signal; a second phase shifter 23 for phase-shifting an output signal from said XOR 21; a second XOR 24 for taking an exclusive OR between an output from the first XOR 22 and an output from the second phase shifter; an inverter 25 for inverting an output from said XOR 24; a third phase-shifter for phase-shifting an output signal from said inverter 25; a third XOR for taking an exclusive OR between an output from said third phase-shifter 26 and an output from said first XOR 22; a first multiplier 3 for multiplying an output from said first XOR 22 and said FM detected signal; a second multiplier 4 for multiplying an output from said third XOR 27 and said FM detected signal; a third multiplier 5 for multip

Abstract: A system and method serves to generate a composite audio signal capable of modulating a radio frequency carrier to a standard television channel for cable transmission. The system includes inputs for a first audio signal, a second audio signal, and a video signal. A third audio signal is generated which is the sum of the audio signals. A fourth audio signal is generated from the difference of the audio signals. The fourth audio signal is pre-emphasized twice and a timing signal is extracted. A first frequency pilot signal is generated from the timing signal. A second frequency subcarrier signal is also generated from the timing signal. The pre-emphasized fourth audio signal is compressed and modulated. The composite audio signal is generated from the third audio signal, the compressed and modulated fourth audio signal, and the pilot signal.

Abstract: Stereo recovery circuitry for a digital receiver is disclosed that provides increased accuracy and efficiency in recovering stereo signal information from transmitted stereo signals. The stereo decoder includes a digitally controlled oscillator that recovers a pilot tone signal from transmitted stereo signal information. By processing demodulated stereo signals on the digital side and digitally controlling the oscillator, the stereo decoder has increased efficiency and accuracy. In one embodiment, the oscillator may be a phase-locked-loop having a loop filter and an amplitude stabilized tunable resonator. Additional circuitry is disclosed for utilizing the pilot tone signal to recover left and right channel signal information from the demodulated stereo signals.

Abstract: The noise in a frequency demodulated audio signal is detected on basis of the characteristics of the stereo-multiplex signal to obtain a very reliable information that can be used for the sliding stereo-mono transition, noise blanking and a de-noising of the stereo-difference signal. A noise signal (vd,l(t)−vd,u(t) or vd,u(t)−vd,l(t)) is calculated by subtracting one sideband of the stereo-difference signal from the other sideband of the stereo-difference signal and as a direct measure for the quality of the signal generating the variance (&sgr;2vd) of the noise signal by squaring and thereafter averaging the noise signal.

Abstract: An audio system with wireless speakers eliminates the long audio signal transmission lines between the amplifier and speakers. Sending the radio frequency signal from the amplifier to speakers utilizes wireless communication technique. Therefore, the problems in moving, assembling, and setting up the audio system can be solved.

Abstract: A method of normalizing received digital audio data includes decomposing the digital audio data into a plurality of sub-bands and applying a psycho-acoustic model to the digital audio data to generate a plurality of masking thresholds. The method further includes generating a plurality of transformation adjustment parameters based on the masking thresholds and desired transformation parameters and applying the transformation adjustment parameters to the sub-bands to generate transformed sub-bands.

Abstract: A stereo radio receiver has a channel separation stage for setting an optimal channel separation of the left audio channel from the right audio channel, even under sufficient receiving field strength following a time of multipath reception for the duration of the operating time of a timing element, to a reduced (i.e., lesser degree of) channel separation.

Abstract: A method and apparatus for high fidelity duplexing, local transmission and reception of audio-signals transmitted from sources such as stereos, televisions, or musical instruments is taught. According to these teachings, high fidelity wireless stereophonic transmission system having a plurality of audio channels are realized. An oscillator is electrically connected to the first audio channel to provide a first carrier frequency upon which the data of the first audio channel is imposed. The first carrier frequency is then combined with a second audio channel's data forming a composite signal. The composite signal is then imposed on signal generated by a second oscillator. This second oscillator provides a carrier frequency for a frequency modulated (FM) transmitter. The signal from the FM transmitter is received by a receiver and the respective signal's of the two audio channels are demodulated and used to drive speakers.

Abstract: A method and apparatus for controlling display of content signals begins by receiving a content signal that includes video content and at least one associated content control indicator. The content signal may also include audio content associated with the video content. The processing continues by comparing the at least one associated content control indicator (e.g., a rating of mature subject matter of the content signal) with at least one content control setting (e.g., a parental setting based on allowable viewing of rated content signals). When the associated content indicator compares unfavorably to the content control setting, a video graphics processor scrambles the at least a portion of the video content. The scrambled video content is then provided to a video rendering device for subsequent display.

Abstract: A method (100) and apparatus (400) for encoding and decoding data in a signal using notch depth modulation. The method (100) of data to be encoded in the signal. The method then notch filters (125) the signal according to the frequency notch representation of the data. The apparatus (400) for encoding data comprises an digitizer (405) to digitize the signal. A code former (420) provides the data to be encoded in the signal. A notch filter (430) notch filters the signal according to the data. Decoding the data converts the signal into a frequency domain representation (520) and determines the notch spectral content (525) of the signal at selected notch frequencies. The method (500) establishes notch thresholds (534) at each of the selected notch frequencies, then decodes the data (540) from the signal by comparing the notch spectral content to the notch thresholds.

Abstract: A method of coding a time-discrete stereo signal, the stereo signal having a first and a second channel, permits scalable stereo coding. At first, a mono signal is formed from the stereo signal, which is then coded, whereupon the coded mono signal is transmitted to a bit stream. Thereafter, the coded mono singal is decoded again, whereupon stereo information is formed on the basis of the coded/decoded mono signal and the first and second channels, with such stereo information being coded and being also written into the bit stream in order to obtain a bit stream comprising a complete coded monolayer as well as a layer with coded stereo information.

Abstract: An input digital audio signal is divided into sub-band signals in respective sub-bands. Scale factors of the respective sub-bands are determined on the basis of the sub-band signals for every frame. Calculation is made as to differences between the determined scale factors for a first frame and the determined scale factors for a second frame preceding the first frame. Absolute values of the calculated scale-factor differences are calculated, and data representative of the calculated absolute values are generated. The data representative of the calculated absolute values are encoded into data of a Huffman code. Sign bits are generated which represent signs of the calculated scale-factor differences. The sub-band signals are quantized in response to the determined scale factors for every frame to generate quantized samples of the sub-band signals. The Huffman-code data, the generated sign bits, and the quantized samples of the sub-band signals are combined into a bit stream.

Abstract: A feedback controller, embedded in an FM audio processor, that controls the “integrated multiplex power” to the requirements of ITU-R 412 (2.51) is disclosed. This regulation specifies the maximum power, which is the same as the power produced by a sinewave modulating the carrier ±19 kHz (where ±75 kHz is 100% peak modulation). The controller applies the square of the multiplex signal to an integrator. A constant is removed from the integrator; representing the maximum power threshold. The output of the integrator is sampled periodically with a sample-and-hold circuit. A second integrator receives the output of the sample-and-hold. The output of the second integrator circuit is added to the threshold setting of a compressor, which determines the average power output of the compressor. The output of the compressor is applied through a peak controller to the input of the multiplex coder, closing a feedback loop, which controls the integrated multiplex power to a preset threshold.

Abstract: A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Each subsequent stage of the digital multi-channel decoding process is performed at the lowest sampling rate that yields acceptable performance for that stage. Analog-to-digital conversion of the composite audio signal is performed first to generate a composite digital audio signal. After analog-to-digital conversion, all signal processing may be performed in the digital domain. The composite digital audio signal is digitally filtered to frequency compensate for variations caused by previous stages of processing, including IF demodulation. Digital channel demodulation and filtering are performed to isolate single channels of the composite digital audio signal such as SAP, L−R, and L+R channels.

Abstract: Apparatus and method for transmitting and reproducing stereophonic audio signals are disclosed. The method comprises splitting first and second channels into two frequency bands, combining the lower frequency band signals of the two channels, and transmitting the combined signals of the two channels or signals representative thereof. The apparatus comprises: a splitter for splitting each of the two channels into two frequency bands, a combiner, for combining the lower frequency band signals of the two channels, and a transmitter for transmitting the combined signals, or signals representative thereof, and the higher frequency band signals of the two channels, or signals representative thereof.

Abstract: A Wireless Concealed Transmitter Stereo Center Speaker System includes a concealed transmitter unit installed a center speaker, and two receiver units installed in two rear speakers, wherein the concealed transmitter unit includes an automatic audio level regulating circuit to regulate the audio level of the output signal of audio equipment to a predetermined range, a power control circuit controlled by the output signal of the audio equipment to provide the necessary working voltage, and an inductance antenna to transmit stable output signal from the audio equipment to the receiver units of rear speakers; the receiver units are of low working voltage design, including an automatic 24-time frequency divider circuit to effectively discriminate left and right sound tracks, and an auto-shut off circuit to automatically cut off power supply from either an alternating current source or battery power supply when the audio equipment does not work; the concealed transmitter unit and the receiver units further use a r

Abstract: The invention relates to a device for receiving digital radio signals. The device has a digital receiving appliance comprising a tuner and a demodulator that is connected to said tuner. The device also contains a first microcomputer. The demodulator and the first microcomputer are connected to a supplementary module by an appliance interface of the digital receiving appliance. Said supplementary module has a second microcomputer and a signal processing unit which is controlled by said second microcomputer and which is connected to the appliance interface at the output end. The supplementary module also contains at least one other signal output through which the signals that are processed in the signal processing unit can be output.

Abstract: The invention addresses itself to the task of providing a medium-frequency stereo broadcast receiving circuit that does not require any alteration of the radio wave format used in the medium-frequency stereo broadcast system that has become the de facto standard, and that receives transmitted broadcast waves and removes, in the course of the demodulation process, disturbance that has affected the signal during its propagation, thereby improving the audio quality of the demodulated signal and obtaining the full potential of the stereo effect. To achieve this, the received medium-frequency stereo broadcast wave is converted to a single-sideband signal, and the sum signal (L+R) is demodulated from the phase term of this converted single-sideband signal. The difference signal (L−R) is demodulated from the phase term of the received medium-frequency stereo broadcast wave and from the demodulated sum signal output.

Abstract: An audio amplifying circuit and system for amplifying and broadcasting audio signals using high efficiency Class D switching amplifiers, consisting of a battery charger and batteries suitably sized to supply power to the system for operation at full output power for a predetermined time. The system may have a power conditioning section for converting input power directly into the necessary DC voltage used by the class D amplifiers. The system can deliver over 100 watts RMS in a small form factor to a suitable arranged and impedance matched acoustical transducers configured as either a single point acoustic source or in a distributed pattern. The system may provide audio coverage of either indoor or outdoor areas by adjusting the number and type of acoustic transducers, and be activated or controlled either remotely or locally to provide public notification and emergency warning messages.

Abstract: In a device for processing a stereo audio signal having a first channel (L) and a second channel (R) the stereo signal is at first analyzed (12) to obtain a measure for a quantity of bits required by a coder to code the stereo audio signal using a coding algorithm. The first channel and the second channel are then modified (14) when the measure for the quantity of bits is larger than a predetermined value, the modification being performed in such a way that the energy of a sum signal of the first and the second modified channel (L′, R′) is in a predetermined relation to the energy of a sum signal of the first and the second channel and that a difference signal of the first and the second modified channel is attenuated in contrast to the difference signal of the first and the second channel.

Abstract: An audio input interface (122) receives a digital audio signal and identifies an audio bitstream which is optionally decrypted by a decryption unit (123), and decoded by an audio decoding unit (124). An audio digital to analog converter (126) converts the decoded audio bitstream to an analog audio signal which is optionally decrypted by an audio analog decryption unit (127). A video input interface (142) receives a digital video signal and identifies a video bitstream which is optionally decrypted by a video digital decryption unit (143), and decoded by a video decoding unit (144). A video digital to analog converter (146) converts the decoded video bitstream to an analog video signal that is optionally decrypted by a video analog decryption unit (147). An analog transmitter (150) mixes the analog audio signal and analog video signal and transmits an analog wireless output signal to an analog wireless device (110).

Abstract: A portable spa including an audio system designed to use the spa shell as the sound generating device. Transducer devices are mounted within an enclosure which is bonded to the spa shell so as couple the sound vibration energy to the shell so that sound can be heard when using the spa.

Abstract: There is disclosed methods and apparatus for is for high quality, multimedia broadcast networks. Highly scalable, fault tolerant, filly integrated scheduled live video streaming are enabled or facilitated. A disclosed solution offers easy access, a convenient web-based remote management console and a flexible structure.

Abstract: A stereo broadcasting receiving device comprises pseudo stereo signal generation means for generating a pseudo left stereo signal and a pseudo right stereo signal from an L+R signal, first multiplication means for multiplying the pseudo left stereo signal by a first coefficient, second multiplication means for multiplying the pseudo right stereo signal by the first coefficient, third multiplication means for multiplying the L+R signal by a second coefficient, fourth multiplication means for multiplying an L−R signal by a third coefficient, coefficient determination means for determining the first coefficient, the second coefficient, and the third coefficient on the basis of the result of judgment in receiving state judgment means, means for generating a left stereo output signal on the basis of an output signal of the first multiplication means, an output signal of the third multiplication means, and an output signal of the fourth multiplication means, and means for generating a right stereo o

Abstract: A compander for noise reduction of a FM signal is described, wherein a group delay (&tgr;) linked to the generation of the compressor gain (cc(t)) is equalised during generation of the multiplex signal (m(t)), and a group delay (&tgr;) linked to the generation of the expander gain (ce(t)) is equalised during generation of the sum signal (us(t)) and the expanded difference signal (ue(t)). Alternatively or additionally the compressor gain and/or the expander gain is controlled by an auxiliary signal on the basis of a combination of sum signal and difference signal of the FM signal. Such companders avoid overmodulation in the transmitter.

Abstract: Perceptual coding of spatial cues (PCSC) is used to convert two or more input audio signals into a combined audio signal that is embedded with two or more sets of one or more auditory scene parameters, where each set of auditory scene parameters (e.g., one or more spatial cues such as an inter-ear level difference (ILD), inter-ear time difference (ITD), and/or head-related transfer function (HRTF)) corresponds to a different frequency band in the combined audio signal. A PCSC-based receiver is able to extract the auditory scene parameters and apply them to the corresponding frequency bands of the combined audio signal to synthesize an auditory scene. The technique used to embed the auditory scene parameters into the combined signal enables a legacy receiver that is unaware of the embedded auditory scene parameters to play back the combined audio signal in a conventional manner, thereby providing backwards compatibility.

Abstract: A method for influencing the channel separation of an audio signal to be reproduced, obtained from a received radio signal, in a radio receiver, as well as a radio receiver for carrying out the method includes an auxiliary field strength signal derived from the received field strength of the received radio signal, and an auxiliary interference signal derived from signals indicating reception interference events, being combined with one another and with an auxiliary channel separation signal that is derived from a signal indicating the frequency of interference events, to yield a factor D which influences the stereo channel separation.

Abstract: A multiple signal carrier transmission apparatus and method for broadcasting stereo sounds to an audio output device uses three related carrier frequencies on which are modulated the sum of first and second stereo channel signals and the first and second stereo channel signals themselves. The composite multiple carrier frequency signal is transmitted to a receiver which separates the three carrier frequency signals to generate a separate left channel signal, a right channel signal and a composite center channel, monophonic, signal which is the sum of the first and second channel signals. A detector monitors the signal strength of each separate left and right channel signal to detect a decrease in either channel output below a threshold. When a decrease below the threshold is detected, the center sum signal replaces the left and/or right channel signal having the diminished signal strength for output through the appropriate speaker to minimize channel fade out.

Abstract: A portable spa including an audio system designed to use the spa shell as the sound generating device. Transducer devices are mounted within an enclosure which is bonded to the spa shell so as to couple the sound vibration energy to the shell so that sound can be heard when using the spa.

Abstract: A storytelling system in which a base unit broaadcasts some blocks of audio data stored therein, and transmits other blocks of audio data stored therein to remote units either for remote broadcast, or cause the remote units to illuminate. Transmission to the remote units may be as radio signals, as ultrasound signals, as infrared signals, or as electrical impulses transmitted along wires. The blocks of data include identification codes to indicate which units are to broadcast the blocks of audio data or illuminate. The remote units have unique identifying features and are covered by matching dolls representing characters of the story. Each remote unit broadcasts the audio data appropriate to its own doll, or illuminates its own doll while the audio data appropriate to its own doll is being broadcast by the base unit.

Abstract: An automobile audio system, including a transmitter configured for installation within an automobile and further configured to wirelessly transmit modulated carrier data associated with at least two audio signals so that the modulated carrier data is receivable within the automobile. The automobile audio system may also include a receiver configured for use within the automobile, where the receiver is selectively tunable to obtain a recovered audio signal from the modulated carrier data and output the recovered audio signal, the recovered audio signal being an at least approximate reproduction of a user-desired one of the audio signals.

Abstract: A supplemental audio content system is for providing supplemental audio content to movie patrons during playing of a motion picture film and associated soundtrack in a cinema of cineplex including a plurality of individual cinemas. The system may include a player for playing supplemental audio content during playing of the motion picture and associated soundtrack, and a wireless transmitter connected to the supplemental audio content player. An earphone may be worn by the movie patron, and the earphone may be connected to a wireless receiver to cooperate with the wireless transmitter to deliver supplemental audio content to the at least one movie patron. The wireless transmitter and wireless receiver preferably have operating characteristics to avoid interference with respective supplemental audio content systems for other cinemas of the cineplex.

Abstract: An audio/mechanical/visual transducer system that makes use of a wireless communication channel for communicating between the audio signal generator and the transducer, through a wireless transmitter is provided. This invention provides an RF or Power Line Carrier path for communicating the audio signals to a variety of transducer devices, thereby permitting maximum positional flexibility for the transducers without requiring additional or dedicated wiring.

Abstract: A receiver for receiving a digital audio broadcast by which digital audio data and incidental control data are sent out includes a reception circuit for receiving the digital audio broadcast, a decoder circuit for extracting the digital audio data and the control data from a signal received by the reception circuit, a D/A converter for performing D/A conversion of the thus extracted digital audio data into an analog audio signal and outputting the analog audio signal, a controller for controlling a characteristic of the analog audio signal in accordance with the extracted control data, and a memory into which the one of the digital audio data and the control data which had been extracted at an earlier time by the decoder circuit is written.

Abstract: Audio data and additional audio information multiplexed therewith and distributed are received by an integrated receiver decoder. The received audio data is separated and decoded by a received-signal processing section. The data is then sent to an external recording unit and recorded onto a recording medium. The received additional audio information is separated by the received-signal processing section. The title of a musical piece and performer information are sent to the external recording unit through a digital interface or an infrared interface, and written onto a predetermined area of the recording medium.

Abstract: There is provided a digital broadcasting receiver capable of making channel selection without making a user conscious of the difference between a physical channel number and a virtual channel number. A CPU uses an OSD display circuit, for example, to display a menu screen, and causes a user to select either a first mode or a second mode. The first mode is a mode for making channel selection by the physical channel number in which a frequency is assigned to a channel by the physical channel number in accordance with a rule, and a second mode is a mode for making channel selection by the virtual channel number in which a frequency corresponds to a channel on the side of the receiver. The CPU automatically makes, when no channel selection can be made by the entered channel number in the selected mode, an attempt to make channel selection corresponding to the other mode.

Abstract: An aural information is expanded correspondingly to a compression system and a compression rate when a receiving signal from a digital telephone circuit is the aural information and a control signal received from the digital telephone circuit indicates that the aural information is compressed. When the control information indicates a stereo system including a right voice system and a left voice system, right and left voices are separated and output. Thus, a stereo communication is realized with an improved tone quality with using a digital telephone set.

Abstract: A system and method for audio telepresence. The system includes a user station and a telepresence unit. The telepresence unit includes a directional microphone for capturing sounds at the remote location, and means for converting the captured sounds into a stream of data to be communicated to the user station. The user station includes means for receiving the stream of data and a plurality of speakers for recreating the sounds of the remote location. The user station and the speakers are located within an anechoic chamber where sound reflections are substantially absorbed by anechoic linings of the chamber walls. Because of the substantial lack of sound reflection within the anechoic chamber, a user within the anechoic chamber will be able to experience an aural ambience that closely resembles the sounds captured at the remote location. The user station may include microphones for capturing the user's voice, and the telepresence unit may include speakers for projecting the user's voice at the remote location.

Abstract: According to the invention, a circuit arrangement for gaining a 38 kHz stereo subcarrier and a 57 kHz RDS carrier for decoding a stereo signal comprised in a demodulated FM signal and/or an RDS signal comprised in a demodulated FM signal, having a simple structure with only one PLL and particularly only one voltage-controlled oscillator (2) is characterized in that the arrangement comprises a phase-locked loop with a loop filter (1), a voltage-controlled oscillator (2), a first phase detector (3) which receives a reference signal having a reference frequency, and a second phase detector (4), which receives the FM signal, the output signal of the voltage-controlled oscillator (2) being coupled to both phase detectors (3, 4) in a form divided down by means of dividers (6, 9; 10, 11), and the signal fed back to the second phase detector having a frequency of 19 kHz, in that dividers (9, 10, 12) are provided, by means of which the output signal of the voltage-controlled oscillator (2) is divided down and which su

Abstract: Method and apparatus for generating a composite audio signal clocked to a selected frequency from left and audio input signals. A video/audio signal generator transmits the left and right audio input signals, together with a video signal having a horizontal synchronization signal embedded therein. If copy protection has not been applied to the video signal, the embedded horizontal synchronization signal will have a frequency of 15.734 KHz. If applied to the video signal, copy protection techniques will shift the frequency of the horizontal synchronization signal. To avoid distortion of the composite audio signal, a switch configured to selectively couple the video signal or a secondary video signal generated by an internal video signal generator to an audio signal processor which generates the composite audio output signal from the left and right audio input signals. Embedded within the secondary video signal is a horizontal synchronization signal having a frequency of 15.734 KHz.

Abstract: Apparatus for labelling a stereophonic signal includes a plurality of notch filters having selected center frequencies to form notches at the selected frequencies in the channels of a stereophonic audio signal. Code generating components produce a coded label signal in the form of one or more code words, with the code being formed of selected signal bursts at the selected frequencies. The coded label signals are inserted into both channels of the audio signal, in the notches formed by the notch filters. The code signal amplitude bears a predetermined relationship to the audio signal amplitude in each channel.

Abstract: A system for wireless transmission between a device such as a game controller and a base transceiver linked with a host device. Multiple controllers can be linked with the base transceiver through radio frequency transmission, and audio signals can be selectively transmitted there between. Audio commands can be introduced with manual controls at the controller for transmission to the base transceiver. Audio signals can be generated, mixed or otherwise processed by the combination of the host device and base transceiver for selective transmission to one or more controllers. The combination of manual switches, audio commands, and radio frequency transmission provides unique combinations of interaction between a person and the host device.