Abstract: A television set having an .alpha.-wave generation function includes a user key input portion, an .alpha.-wave generator, a sound producer, a first switch for selectively applying the .alpha.-wave generated by the .alpha.-wave generator to the sound producer and a controller for controlling an on/off operation of the first switch in response to a user input via the key input portion, to thereby enable a user to select the .alpha.-wave generation in the television set. Through a second switch for selectively applying an audio signal to the sound producer and a third switch for selectively supplying a video signal to a cathode ray tube of the television set, the user can control the .alpha.-wave generation simultaneously or independently from the audio and video signals.

Abstract: A composite electronic apparatus consisting of a video and audio signal processing portion including image displaying circuits for displaying images based on a video signal and sound reproducing circuits for reproducing a sound based on an audio signal, a position detecting portion for conducting positional detection to produce position data representing a detected position, a data reproducing portion operative to read information from a record medium and to reproduce map data or video or audio data on the basis of the information read from the record medium, a data processing portion for causing the position data and the map data to be subjected to predetermined data processing, a video signal transmitting portion operative to produce a video signal for image display on the basis of the position data and the map data subjected to the predetermined data processing and to transmit the video signal for image display to the image displaying circuits so that images displayed by the image displaying circuits, and

Abstract: A television for storing and displaying a stored still picture, which includes: a memory for storing a still picture of a desired scene; a decoder for separating a video signal of a broadcast channel into an RGB signal and a synchronizing signal; a synchronizing signal detector for outputting a detection signal according to the existence of the synchronizing signal; a microcomputer for controlling so that the RGB signal output from the decoder can be displayed on a picture tube by recognizing the detection signal when a normal broadcast signal is input and so that the still picture stored in the memory can be displayed on the picture tube when a normal broadcast signal is not input. Thus, if a broadcast channel goes off the air, or a channel which is not on the air is selected, a selected picture is retrieved from the memory and displayed on the television screen, thereby reducing eye fatigue.

Abstract: A channel selection apparatus is provided for allowing receipt of signals broadcast according to the NTSC, SECAM and PAL broadcast modes. A controller discriminates the signal's broadcast mode based on the horizontal sync signal included in the received signal and alters a circuit connection path. Accordingly, a desired broadcast mode can be automatically selected without requiring any particular switch manipulation by a user. Further, a video signal processing path is separated from a sound signal processing path, in order to obtain excellent sound quality, even when receiving a stereo broadcast. Also, it is possible to easily automate the manufacturing process for the apparatus, thereby improving productivity.

Abstract: A compact-disk-player-incorporated television receiver includes; in a single case, a television signal receiver for receiving a tuned television signal and detecting video and audio signals from the received signal and outputting the same, a compact disk player having a song accompaniment function for receiving a first control signal input as data and a second control signal input via an instruction input unit, reading data from at least one type of compact disk if the two control signals are identical, and then outputting video and audio signals, a video signal processor for selectively receiving and signal-processing a video signal from the television signal receiver or a video signal from the compact disk player and displaying the processed signal via a display, an audio signal processor for selectively receiving and signal-processing an audio signal of the television signal receiver or an audio signal of the compact disk player and displaying the processed signal via a sound converter, a power source for

Abstract: A direct broadcast satellite sends subscribers signals received from an earth-station transmitter and typically having a 10 MHz bandwidth, 6 MHz for an analog video station and 4 MHz for up to 24 digital audio stations. When a subscriber selects one of the audio stations, an FM demodulator recovers the 10 MHz signal; a variable gain amplifier amplifies the received signal; and an A/D converter digitizes the amplified signal at (e.g.) 24.576 MHz. A digital synthesizer produces trigonometric functions (sine, cosine) at (e.g.) 24.576 MHz, and mixers downconvert the signals to baseband. The sampling frequency is then reduced to 256 KHz, twice the digital audio signal baud rate. In response to the 256 KHz signals, a first servo varies a VCO frequency to obtain a regulation by the A/D converter of the digitizing frequency at 24.576 MHz and another servo regulates the frequency of the trigonometric functions.

Abstract: A hybrid analog/digital STB includes a tuner supplying respective analog and digital television signal processing paths. The analog processing path provides demodulated composite analog video and audio signals and the digital processing path provides demodulated component digital video and audio signals. The demodulated analog and video signals are combined in composite or component form to achieve various desirable effects in a highly flexible system architecture. OSD and display map normalization functions are also integrated within the system architecture.

Abstract: An automatic gain control circuit for controlling gain according to a sound gain controller so as to output a stable video intermediate frequency signal includes a first gain control amplifier receiving a video intermediate frequency signal, for amplifying the signal by a sound gain control voltage and for then producing an amplified video intermediate frequency signal, a second gain control amplifier receiving a carrier signal having a sound intermediate frequency signal and a video intermediate frequency signal, for amplifying the carrier signal by the sound gain control voltage and for then providing the amplified carrier signal, and a sound gain control voltage detecting circuit for receiving the amplified signal from the second gain control amplifier, for detecting the sound gain control voltage and for then providing the detected sound gain control voltage to thereby automatically control the gain of said first gain control amplifier.

Abstract: A system for automatically adapting the mean sound level of a television receiver. The system for automatically adapting the mean sound level of a television receiver comprises an adapting module comprising both a video adapting circuit comprising at least one additional input highpass filter and a fixed-gain video amplifier connected in series and interposed in the video image processing circuits at circuity for providing video image signals, and secondly an audio adapting circuit interposed in the sound path at circuity for taking audio signals to detect the input mean level of sound, to compare said mean level of sound with a pre-established reference mean level, and automatically to adapt the mean level of output sound to maintain it at the pro-established reference mean level.

Abstract: In a video transmitter including a first data processing system wherein compressed and encoded video-audio data are read out of a first store under control of a CPU, and then decoded to be reproduced, there is provided a second data processing system for after-recording, data processing operation of which is controlled by a CPU. The second processing system comprises a audio data compressor, a first buffer memory, a second store, a second buffer memory, and a audio data decoder. Reproducing operations of the first and second data processing systems are performed in synchronism with each other. Thus, with a video transmitter equipped with a codec apparatus, it is possible to achieve after-recording.

Abstract: A device for processing a modulated real analog television signal has a digital preprocessing stage for conditioning a complex digital signal for digital demodulation of a television signal at intermediate frequency. The digital signal preprocessing is carried out such that subsequent demodulation of the video and audio elements can be carried out at a favorable cost. Therefore a fully-digital signal processing for television signals, from the intermediate frequency, with a limited filter cost is possible.

Abstract: A real time visual communication system capable of improving a correspondence between a received video signal and a received audio signal in real time and improving reality. An AV signal is separated into a video signal and an audio signal, and the output state of the video or audio signal is controlled by the characteristics of the audio or video signal. For example, the sound field, reverberation, and the like are controlled in accordance with the characteristics of the video signal. A suitable image pickup unit is selected in accordance with the characteristics of the audio signal to make the sights of conversation participants coincide with each other. It is possible to reproduce sounds of audio signals well matching video signals and to provide visual communication having good reality because of the combination of matched audio and video signals.

Abstract: A signal transmitter and receiver (or a combination thereof) incorporated for example in audio and video apparatus such as a TV and a video-deck, comprises a synchronizing signal separator separating a synchronizing signal from video-signal, a monostable circuit of which period recovering its stable state, or unstable period, after an input of triggering signal, is longer than the period of synchronizing signal separated by the synchronizing signal separator, and a dc-power supply on-off controller controlling the on-off of dc-power supply according to the output of the monostable circuit. The dc-power supply on-off controller limits the supply of dc-power to a minimal number of circuits except during signal processing.

Abstract: A digital audio broadcast receiving apparatus that minimizes a frequency at which the user switches between NICAM audio and analog audio. When a reserve audio switching flag C4 is "H" it indicates that analog audio and NICAM audio represent the same program, in which NICAM audio, which provides better sound quality, is automatically selected. If a broadcast receiving condition deteriorates, analog audio is automatically selected. Conversely, when the flag C4 is "L", it indicates that NICAM audio and analog audio represent two different programs. In this case, analog audio that is in synchronization with video is automatically selected. At this moment, it is possible that the user intentionally selects NICAM audio, which is not related to video, so that NICAM audio is not switched to analog audio even if NICAM audio has some noise. An audio switching point is shifted by changing a threshold for determining PCM data error rate or by changing a sampling time.

Abstract: The television sound volume to be achieved when a television is turned on by an on-time reservation function is preset into the system along with presetting the on-time of the television. The setting is accomplished using arrow keys and viewing an on-time reservation means on the television screen.

Abstract: An improved audio recording/reproducing apparatus reduces noises in the reproduced audio signal by employing a bypassing circuit which includes a transistor having a low internal resistance.

Abstract: A circuit for controlling the audio signal output of a television, in which it is determined whether video and audio signals are input from an external source, such as a video tape recorder. If so, then the audio output signals are properly controlled according to whether the audio signal are mono or stereo-type signals. The circuit includes an audio input state detecting circuit for determining the audio input state by employing an exclusive OR gate and at least two analog/digital converters, and a video signal detecting circuit for detecting whether or not video signals are input. A switching circuit performs switching operations through an AND gate which logically combines the output of the audio signal state detecting circuit and the output of the video state detecting circuit. Therefore, even in the case where the audio signal is a mono-type signal, a quasi-stereo sound is output through both left and right speakers.

Abstract: A sound carrier detecting circuit for use in a television or a video tape recorder is disclosed. During the sound carrier detection, the carrier frequency of the sound signals is corrected by utilizing pulse width modulation signals output from a microprocessor, so that the noise due to shifting of the detected frequency can be eliminated. The circuit includes a key input part provided with one or more keys for selecting a tuning state, and a microprocessor for outputting pulse width modulating signals and manual sound tuning signals in response to appropriate settings of the key input means. A variable oscillating part for converting the pulse width modulating signals into dc component signals and, in turn, outputting variable frequency signals in accordance with the level of the dc component signals is provided alongside a frequency modulating and oscillating part which oscillates and outputs set frequency signals set to a specific frequency in accordance with the relevant broadcasting method.

Abstract: A circuit arrangement for demodulating the sound signals in a television signal is described, which circuit arrangement ensures a simple and low-cost structure, also for operation at different transmission standards.To this end, the circuit arrangement according to the invention includes an oscillation-generating stage which derives a (first) oscillation from a television signal (IF television signal) modulated on a first intermediate-frequency carrier oscillation, whose frequency corresponds to the frequency of an intermediate-frequency picture carrier oscillation in the IF television signal and encloses a phase angle of at least substantially 90.degree. with the picture carrier oscillation, a (first) mixer stage, a first input of which can receive the (first) oscillation, and a switching device for optionally applying the IF television signal or a sound signal (IF sound signal) modulated on a second intermediate-frequency carrier oscillation to a second input of the (first) mixer stage.

Abstract: Apparatus and method which commands the displaying of audio information on a television receiver display in the case where it is judged that a sound muting control unit was operated, whereby the audio information is displayed by a single operation of the sound muting control unit.

Abstract: Automatically fine tuned pictures and sounds can be obtained from a novel color television system having a video/audio signal adjusting circuit, a remote controller operable for generating a program mode selection signal, a memory having a plurality of memory locations for storing operating parameter data for the video and the audio processing circuit corresponding to program modes, a microprocessor responsive to the program mode selection signal for receiving the operating parameter data corresponding thereto and for generating an audio control signal and a video control signal, a video signal adjusting circuit responsive to the video control signal for adjusting the video signal to have a video characteristic corresponding to the program mode selection signal, and an audio signal adjusting circuit responsive to the audio control signal for adjusting the audio signal to have a frequency band characteristic corresponding to the program mode selection signal.

Abstract: A television set with an integrated radio tuner, such that simulcast radio broadcasts may be played through the television sound system at the viewer's discretion. A user-programmable memory provides the viewer with the ability to store multiple television channel/radio frequency associations. A remote control device provides the viewer with the capability of selecting either normal television audio or radio simulcast sound.

Abstract: An apparatus and method for demodulating and remodulating a transmitted signal prior to presentation to a television receiver, the transmitted signal comprising a video signal, a first channel signal, and a second channel signal, wherein one of the two channel signals is selected, demodulated and remodulated with the video signal prior to presentation to the television receiver. The apparatus allows the viewer of a television receiver which accepts a single channel signal to select between one of two alternate channel signals associated with a video broadcast without the need to modify the television receiver. The apparatus is particularly well suited for television broadcasts using a dual carrier transmission format. A novel varactor diode tuning means is used in one embodiment for changing the center frequency of a frequency modulation demodulator. The disclosed apparatus also transparently allows stereo demodulation for television receivers which are capable of such stereo demodulation.

Abstract: A circuit is provided for precorrecting an aural carrier signal in a common amplifier system in a television transmitter wherein an aural frequency signal and a visual signal are commonly amplified. The precorrecting serves to minimize cross-modulation distortion of the aural carrier caused by the common amplification. A visual carrier signal is modulated by a video baseband signal to provide a modulated video signal from which there is provided a sampled video signal. This sampled video signal is supplied to an aural corrector which provides from the sampled video signal a phase correction signal and an amplitude correction signal. The phase correction signal and amplitude correction signal are used to modulate an aural carrier signal to provide a precorrected aural signal which is then combined with the video signal to provide a combined signal.

Abstract: A frequency controlled clock circuit for use in a television receiver utilizes a detected sound intermediate frequency (IF) signal for use in controlling a voltage controlled oscillator and thereby provide immunity from ghost signals in the transmitted video signal. A phase locked loop responds to phase errors detected from the voltage controlled oscillator and a reference signal from the sound IF signal to control the frequency of the voltage controlled oscillator.

Abstract: A muting circuit for a television receiving set comprises a mute-judging part, a mute key input, an acoustic output circuit, a caption-judging part, and a caption key input. The mute-judging partenters a mute ON and a mute OFF state alternately every time it receives a mute key input signal. The acoustic output circuit reduces the sound output level to zero decibels at the mute ON state, and restores the sound output at the mute OFF state. The caption-judging part enters a caption ON state and caption OFF state alternately every time it receives a caption key input signal while it enters a caption ON state if the mute-judging part enters a mute ON state. Thus, in the mute ON stated the closed caption is displayed on the screen.

Abstract: In a system, a non-volatile memory unit 14 into which data representative of various kinds of functions of a monitor apparatus are stored is provided in the monitor apparatus, a control operation is performed on the basis of the data stored in the non-volatile memory unit 14 by a CPU 13, and the non-volatile memory unit 14 into which the data have been stored is loaded in the monitor apparatus during production of the monitor apparatus. Otherwise, after the non-volatile memory unit 14 has been loaded on the monitor apparatus, the data are stored in the loaded memory unit by using an external computer or a remote controller.

Abstract: A mute circuit of a MUSE decoder can remove noise produced in the changing of channels in a multi-broadcast receiver and includes a synchronizing signal comparator for comparing the audio frame synchronizing signal of a received signal with a standard frame synchronizing signal and producing a comparison result, an unequal bit number detector for receiving the comparison result and detecting the number of non-matching synchronizing bits per frame, and a mute controller for controlling a mute operation according to the detected number of non-matching synchronizing bits per frame. Also, in a method employing the above components, after having detected the number of non-matching bits of the audio frame synchronizing signal, the time for muting process is determined according to the detected number. Thus, excessive errors in a received signal and noise produced when changing channels can be removed completely.

Abstract: A circuit for controlling a reproduced volume level of an audio signal to a desired level includes a peak detector for detecting a peak amplitude level in the audio signal, a user operable control for generating a signal indicative of a desired amplitude level, a comparator for comparing the detected peak amplitude level in the audio signal with the desired amplitude level and for generating a comparison signal as a result of the comparison, and a voltage controlled amplifier coupled to the comparator for adjusting the peak amplitude level in the audio signal in dependence on the comparison signal. The output from the voltage controlled amplifier then has the desired level.

Abstract: In a sound multiplex broadcast system employing sound multiple signals having a plurality of sound multiplex modes and a display control method therefor, there are detected kinds of sound multiplex mode of sound multiple signals received by the receiver, a sound multiplex mode is set, a demodulated sound output signal of a mode determined according to the mode detection signals and the mode setting signal is selected from demodulated sound output signals attained by demodulating the received sound multiple signals so as to be supplied to a sound output unit, and a kind of sound multiplex mode of the demodulated sound output signal thus selected is displayed on a display unit.

Abstract: A stereo/multivoice recording and reproducing apparatus used for a high fidelity video tape recorder comprises a multi-channel television system (MTS) decoder for demodulating stereo and multivoice signals included in an IF signal supplied from a tuner, a high fidelity audio processor for frequency-modulating the stereo signal output from a MTS decoder, left and right channel heads for recording the stereo signal frequency-modulated in the high fidelity audio processor, a second audio processor for amplifying the multivoice signal from the MTS decoder, and a third audio head for recording the multivoice signal amplified in the second audio processor. According to one aspect of the invention, the apparatus can simultaneously record stereo and multivoice signal and selectively reproduce one of the stereo signal and the multivoice signal.

Abstract: Based on a series of video data for producing one or a plurality of text displaying images and a series of accompaniment MIDI data, a signal processing circuit (1) prepares a quasi video signal containing the two kinds of data as arranged in alternating fields or in alternating pluralities of fields in time series and identification data for identifying the series of video data and MIDI data. The quasi video signal is transmitted to terminal units (5) for users via a CATV or like transmission path. The terminal unit extracts from the quasi video signal fields of MIDI data and video data containing identification data specifying a piece of music selected by the user, and reproduces the accompaniment of the selected piece and displays the text thereof based on the extracted data.

Abstract: An acoustic sound reproducing system includes an audible signal reproducing apparatus, television receiver and a speaker system. The audible signal reproducing apparatus and the speaker system are connected to the television receiver. The television receiver has a power switch and a selecting switch which exchanges an output signal from the audio signal reproducing apparatus for an output signal from the television receiver when the power switch is changed to an on-position.

Abstract: A buffer system for TV receivers includes a cyclic storage device connectible to the demodulation circuits for continuously storing the audio and video signals last outputted thereby only over a predetemined time interval, enabling the viewer to jump-back to see a preceding portion of the TV broadcasts. In one described embodiment, the viewer normally sees the broadcasts in a real-time manner but may depress a button to see the broadcasts in a delayed-time manner via the cyclic storage device. In a second described embodiment, the viewer normally sees the broadcasts in a real-time manner, may depress a button to freeze a part of the broadcast in another storage device, and may later depress another button to play back the portion frozen.

Abstract: A system for processing audio and video components of a television signal provides for automatic control of closed caption signal display in response to the status of an audio muting feature. The system includes an operating mode in which enabling audio muting also enables the closed caption display and disabling muting disables generation of the closed caption display.

Abstract: A de-interleaving system includes a generator for generating a write address for storing input audio data of a D2 MAC signal in units of packets, a generator for generating a read address for de-interleaving the stored audio data of the D2 MAC signal in units of packets so that the audio data is arranged in the sequence of pre-interleaving, a plurality of RAMs for storing the audio data of the D2 MAC signal according to the write address applied from the write address generator and for reading the stored audio data according to the read address applied from the read address generator, and several selectors for receiving the write address and read address from the write address generator and read address generator so as to apply the addresses to corresponding RAMs in units of packets of audio data. The system can enhance the error correction capability by receiving D2 MAC signals interleaved in units of packets and de-interleaving audio data in a normal sequence.

Abstract: A sound recording apparatus for use in video tape recorders, for equalizing a sound signal before the sound signal is recorded onto a recording medium includes an operational amplifier where the sound signal is inputted to its first input terminal, a feedback resistor connected to an output terminal and a second input terminal of the operational amplifier, and a simulated inductor circuit connected to the second input terminal of the operational amplifier. The simulated inductor circuit has a buffer where a predetermined bias is provided to its input. Between an output of the buffer and the second input terminal of the operational amplifier is connected an impedance network whose circuit constant is switched by a switch which operates according to a recording speed mode of the video tape recorder. This switching changes an equalizing characteristic of the amplifier.