Abstract: A radio front end utilizes at least one band pass filter to pass only the appropriate frequency band. Once the desired frequency band has been isolated it is converted to a digital format in an analog to digital converter and a digital signal processing device interprets the signal.

Abstract: To improve an S/N of an AM signal in a diversity reception circuit while suppressing an increase in a circuit size of A/D conversion circuits therein. In the diversity reception circuit, a single AM signal is supplied to each of the A/D conversion circuits provided for A/D converting a plurality of FM signals, and a plurality of obtained results of the conversions are added by an adding circuit, thereby improving the S/N.

Abstract: A method for automatically tuning a frequency modulator in a mobile device is described. A frequency band is automatically scanned using a frequency modulation (FM) receiver. The FM receiver is integrated as a part of the mobile device. Quality associated with channels of the frequency band is analyzed to identify at least one available channel at a first frequency. The first frequency is assigned to an FM modulator. The FM modulator is integrated as a part of the mobile device. A determination is made whether a command to scan for a second frequency is received. If the command to scan for the second frequency is not received, a signal on the first frequency is transmitted by the FM modulator.

Abstract: The wide bandwidth transceiver includes a receiver section, a transmitter section, and a local oscillation module. The local oscillation module generates a first and a second local oscillation. The transmitter section converts an outbound baseband signal and/or a low intermediate frequency (IF) signal into a first outbound radio frequency (RF) signal based on the second local oscillation when the wide bandwidth transceiver is in a second wireless standard mode and converts the outbound baseband and/or the low IF signal into a second outbound RF signal based on the first and second local oscillations when the wide bandwidth transceiver is in a first wireless standard mode.

Abstract: A single pole multi throw switch comprises a first switching unit, a second switching unit coupled to a common port and comprising a parasitic off state capacitance, and a matching unit. The matching unit may be coupled between the first switching unit and the common port, wherein the matching unit is configured to contribute, in conjunction with the parasitic off state capacitance of the second switching unit, to an impedance match if the first switching unit is active and the second switching unit is inactive.

Abstract: A disclosed player tracking unit provides a display, a wireless interface device designed or configured to communicate with a portable wireless headset, and a logic device designed or configured to communicate with the display, the wireless interface device, a master gaming controller that controls a game played on a gaming machine, and a player tracking server. The logic device can further communicate with the portable wireless headset using the wireless interface device. The portable wireless headset can include one or more earpieces configured to be worn by a player. Various messages, alerts, music, etc. can be sent from the player tracking unit to the portable wireless headset.

Abstract: A radio system includes: a memory which stores a system parameter and a pseudo parameter, the system parameter being used for generation of a feature value specific to a search target radio system, the pseudo parameter being similar to the system parameter; a feature value generator which generates one or a plurality of the feature values based on a signal in a received frequency band by using the system parameter; a non-feature value generator which generates one or a plurality of non-feature values based on the signal in the received frequency band by using the pseudo parameter; and a determination section which determines whether or not a signal of the search target radio system exists by using the one or the plurality of the feature values and the one or the plurality of non-feature values.

Abstract: An integrated low-IF (low intermediate frequency) terrestrial broadcast receiver and associated method are disclosed that provide an advantageous and cost-efficient solution. The integrated receiver includes a mixer, local oscillator generation circuitry, low-IF conversion circuitry, and DSP circuitry. And the integrated receiver is particularly suited for small, portable devices and the reception of terrestrial audio broadcasts, such as FM and AM terrestrial audio broadcast, in such portable devices.

Abstract: An embodiment of the present invention provides an RF log-amp detector, comprising a pre-amplifer at the input of the RF log-amp detector, a plurality of limiters with variable gain connected to the pre-amplifier, wherein the gain of the preamplifier is set to its minimum and the dynamic range is expanded by modifying the amplification gain of the plurality of limiters, thereby increasing the dynamic range and reducing accuracy, after which a coarse measurement of a power level is taken and wherein the RF log-amp detector then defines which pre-amplification level is required based on the course measurement to bring the signal at the output of the preamp within an optimum dynamic range of the log-amp and wherein the pre-amplification gain is then set while the gain of the plurality of limiters are set to their minimum value with the RF log-amp then performing a second measurement with higher accuracy and calculating the final measurement from fine measurements and the pre-amplification gain.

Abstract: A receiver can be configured to include an RF front end that is configured to downconvert a received signal to a baseband signal or a low Intermediate Frequency (IF) signal. The receiver can downconvert the desired signal from an RF frequency in the presence of numerous interference sources to a baseband or low IF signal for filtering and channel selection. The filtered baseband or low IF signal can be converted to a digital representation. The digital representation of the signal can be upconverted in the digital domain to a programmable IF frequency. The digital IF signal can be converted to an analog IF signal that can be processed by legacy hardware.

Abstract: A Method and Apparatus for Enhancing the Speed of Wideband Signal Search Systems provides a system that can perform hyper fast scanning for signals while at the same time provide very good phase noise performance. The method and apparatus provide a way to reduce costs by avoiding the expensive solutions employed by the unmodified prior systems. The method and apparatus have all of the abilities of standard wideband signal collection systems. Secondly the method and apparatus are able to automatically, and extremely quickly, control multiple VCO's in a finely coordinated tuning process. Thirdly, the method and apparatus still have very good phase noise performance, even though it has hyper fast tuning speeds. Fourthly, the preferred method and apparatus pipeline the digitization and tuning phases of the collection process.

Abstract: A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the sample frequency represents a level within the range of information levels, to shift in frequency noise generated at the sample frequency during encoding of the data sample stream into pulse width modulated patterns.

Abstract: A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the channel spacing or one-half of a channel spacing displaced from an integer multiple of the channel spacing. The local oscillator signal is selected to frequency translate the signal of interest to within a near-baseband passband whose lower edge is spaced from DC by at least about the maximum bandwidth of the signal of interest. Problems associated with 1/f noise, DC offsets, and self-mixing products are avoided or substantially diminished. Other methods and systems are also disclosed.

Abstract: A portable electronic device includes a control unit, an antenna, a switching unit, a multimedia broadcasting unit, a FM unit, and a speaker. The control unit and the antenna are electrically connected to the switching unit. The switching unit is electrically connected to the speaker via the multimedia broadcasting unit and the FM unit. The antenna receives multimedia broadcasting signals and FM signals. The control unit controls the switching unit switch between the multimedia broadcasting unit and the FM unit to receive corresponding signals from the antenna. The speaker outputs the signals from the multimedia broadcasting unit and the FM unit.

Abstract: Systems and methods are provided for accessing broadcast media items and segments from non-broadcast sources. In response to detecting that a user has not finished listening to a broadcast segment (e.g., a radio segment), an electronic device can automatically identify and access an alternate, non-broadcast source for the same broadcast segment (e.g., a corresponding podcast episode). Using the electronic device, a user can play back the segment from the non-broadcast source, starting playback at the last position of the broadcast segment when the user stopped listening to the broadcast. In some embodiments, the electronic device can update library counts (e.g., play counts and new/not new tags) based on media items and segments played back as part of a media broadcast.

Abstract: The present invention is a system for and a method of providing one or more remote coverage areas for wireless communications. In an embodiment, a system for providing a remote coverage area for wireless communications comprises a local system that generates a first radio communication signal and a remote system located geographically remote from the local system. The remote system comprises a first converter that converts the first radio communication signal to a stream of data packets, a network that receives the stream of data packets from the first converter; and a second converter that receives the stream of data packets from the network and generates the remote coverage area by converting the stream of data packets to a second radio communication signal. The remote coverage area may be located indoors.

Abstract: A digital data processing circuit comprising: a setting unit configured to set setting data on an audio signal processing circuit configured to generate an FM modulated signal based on the setting data, the FM modulated signal being a signal to be transmitted wirelessly to an FM radio receiver; and an output unit configured to output audio data for reproducing a predetermined audio signal while the setting unit sets the setting data on the audio signal processing circuit.

Abstract: A FM-AM demodulator includes a FM signal amplifier, a local oscillator, an image oscillator, a first selector, a first orthogonal mixer, an AM signal amplifier, a first frequency divider, a second frequency divider, a second selector, a second orthogonal mixer, a third selector, a first filter, a first amplifier, a fourth selector, a second filter, a second amplifier, a first gain controller, an I/Q compensation unit, an IF oscillator, a third orthogonal mixer, an adder, a channel filter configured to extract a signal with a predetermined frequency band output from the adder, a third amplifier, a second gain controller, a demodulator, and an I/Q compensation controller configured to generate an I/Q compensation signal to use for adjusting phase and gain of the I signal used in an I/Q compensation unit by detecting amplitude of the output signal from the demodulator, and output the generated signal to the I/Q compensation unit.

Abstract: The present invention provides a single circuit and a method which can identify the WLAN standard of a packet or the modulation type of a packet. The single circuit includes a shift register, N determinators and decision logic. The shift register is configured to receive several periods of the preamble of the packet. Each of the N determinators is configured to determine whether the WLAN standard, or the modulation type, of the packet matches one of the N WLAN standards, or the N modulation types. Decision logic is configured to decide the WLAN standard, or the modulation type, of the packet.

Abstract: Digital upgrade system and method for translating analog commands and digital commands in wireless customer services premises equipment (CPE). The digital upgrade system receives a command from a CPE Host and translates the command from analog to digital in order to broadcast it over a wireless digital network to be received by a client. Alternatively, the digital upgrade system receives a digital command from a digital network and translates it to an analog command to be received by a functionality module of a wireless CPE Host.

Abstract: A configurable transceiver includes an RF receiver section that generates at least one downconverted signal from a received RF signal. A receiver processing module processes at least one downconverted signal in a plurality of receiver stages to produce a stream of inbound data, wherein the receiver processing module is configurable in response to a control signal to selectively bypass at least one of the plurality of receiver processing stages. A transmitter processing module processes outbound data in a plurality of transmitter stages to produce at least one baseband signal, wherein the receiver processing module is configurable in response to the control signal to selectively bypass at least one of the plurality of transmitter processing stages. An RF transmitter section generates at least one RF signal from the at least one baseband signal.

Abstract: A wireless device, such as a mobile phone, and a method for operating the wireless device to access a media option. The wireless device may include a media player; a radio signal receiver system configured to receive media signals; a controller comprising a memory comprising a list of different media options, indicating media items the user is interested in taking part of and a media scanner configured to scan the radio signal receiver system to detect media content associated with the media options; a user input interface to select one media item currently indicted as detected; and a media selector configured to pass received media signals relating to the selected media item to the media player.

Abstract: Digital upgrade system and method for translating analog commands and digital commands in wireless customer services premises equipment (CPE). The digital upgrade system receives a command from a CPE Host and translates the command from analog to digital in order to broadcast it over a wireless digital network to be received by a client. Alternatively, the digital upgrade system receives a digital command from a digital network and translates it to an analog command to be received by a functionality module of a wireless CPE Host.

Abstract: A vehicle-mounted receiver system includes a receiver apparatus that is controlled for receiving, in common, transmissions from a plurality of external devices such as a remote key, smart key, etc., having respectively different transmission frequencies. The receiving frequency at the current time is selected based on criteria such as the insertion/non-insertion status of the ignition key, or whether an interrogation signal has been transmitted to a specific external device so that a response transmission is be received from that device during a specific time interval and the receiving frequency is to be set accordingly during that specific interval.

Abstract: A multiband receiver is disclosed for receiving a multiband RF signal having first and second RF bands. The first RF band contains a first service RF range, and the second RF band contains a second service RF range. The receiver includes a mixer for converting the RF signal into an IF signal, using a single local oscillator frequency “f,” and an IF bandpass filter for canceling out some of frequencies of the IF signal outside of a predetermined passband. The local oscillator frequency “f” is determined to allow the first and second service IF ranges to lie outside of the predetermined passband, and to allow a frequency portion of the first IF band exclusive of the first service IF range and a frequency portion of the second IF band exclusive of the second service IF range to lie within the predetermined passband.

Abstract: A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the channel spacing or one-half of a channel spacing displaced from an integer multiple of the channel spacing. The local oscillator signal is selected to frequency translate the signal of interest to within a near-baseband passband whose lower edge is spaced from DC by at least about the maximum bandwidth of the signal of interest. Problems associated with 1/f noise, DC offsets, and self-mixing products are avoided or substantially diminished. Other methods and systems are also disclosed.

Abstract: A system for AM broadcasting, and listing to audio, as well as, viewing slow scan pictures, by using an ordinary AM receiver and a slow scan video converter. The slow scan can be an AM picture, such as, robot 36, or a FM picture in the AM band, using the FAST FM MODE of a slow scan converter, like the KENWOOD VC-H1. A transmitter, like the AM-88 NORTH COUNTRY RADIO, can broadcast in AM or FM mode on the AM band. Because of frequency differences between the audio and video, and if desired, modulation differences between the audio and video, there is no interference between the audio and video on the AM service. A diplexer and an antenna tuner enable both signals to be sent out from the same antenna.

Abstract: A wireless headphone device may include a receiver for receiving a wireless digital signal containing a plurality of digital audio streams combined with control codes according to a predetermined format, a manually operated selector switch for selecting one or more of the plurality of digital audio streams to be produced as audio for the user, and a decoder for extracting the selected audio streams from the received signal in accordance with the predetermined format and for responding to the control codes in the received signal to perform predetermined functions.

Abstract: Aspects of a method and system for integrated FM recording are provided. A multimedia device with various integrated systems such as an integrated FM radio may provide content-based multimedia content recording, recorded content retrieval, and playback of desired or potentially relevant contents. The multimedia device may receive multimedia content along with information identifying the received multimedia content via the various integrated systems. A segment of the received multimedia content may be recorded selectively by comparing the corresponding content information with a favorite content list. The favorite content list may be generated and updated based on the multimedia content and/or program selection data. The multimedia device may have access to additional related stored multimedia contents to retrieve and render the stored segment of the received multimedia content.

Abstract: A meter reading system of the present invention enables transmission of data between utility meter endpoints and readers. In a first embodiment, the endpoint provides a short message providing its identification to the reader and immediately enters a listen mode. If the reader hears the short message, it can immediately respond and request additional information from the endpoint. If the reader does not hear the short message or does not request additional information during the endpoints listening period, the endpoint enters a sleep mode until its next transmission time. In another embodiment, the endpoint transmits an SCM via AM communication to the reader. The reader can then request additional information and the endpoint can respond with the information via two-way FM communication. In another embodiment, the endpoint is capable of transmitting interval data to the reader via either AM or FM communication.

Abstract: The invention relates to an electronic device comprising a headset connector adapted to connect a headset to the electronic device and an active amplifier circuit connected to the headset connector. The active amplifier circuit is adapted to amplify radio signals received by an antenna, which is connected to the electronic device via the headset connector. The invention relates equally to a chip comprising such an active amplifier circuit, to a system comprising the electronic device and to a corresponding method for receiving radio signals at such an electronic device.

Abstract: Aspects of the method and system for rejecting single sided leakage into an amplitude modulated channel may comprise an AM demodulator for demodulating a received composite broadcast signal's control channel to generate an amplitude modulated (AM) component. A PM demodulator may demodulate a received composite broadcast signal's control channel to generate a phase modulated (PM) component. At least one subtractor may subtract an AM leakage component and a PM leakage component contributed by the single sided leakage in the received composite broadcast signal's control channel. The system may comprise at least one of each of AM and PM bandpass filters and envelope detectors that filter and detect envelopes of the AM and PM components at 982.5 Hz and 922.5 Hz.

Abstract: An electric device for receiving a radio frequency (RF) signal is provided. The electric device includes an antenna, a first power amplifier, a battery, a second filter and a second power amplifier. The antenna is used for receiving and outputting a RF signal. The first power amplifier is used for receiving the RF signal, amplifying the RF signal and outputting the RF enhanced by the first power amplifier and a feedback signal. The battery is used for providing a working voltage to the first power amplifier, and receiving and outputting the feedback signal. The second filter is used for receiving the working voltage provided by the battery and the feedback signal, filtering the feedback signal and outputting the working voltage. The second power amplifier is used for receiving the working voltage.

Abstract: The wide bandwidth transceiver includes a receiver section, a transmitter section, and a local oscillation module. The local oscillation module generates a first and a second local oscillation. The transmitter section converts an outbound baseband signal and/or a low intermediate frequency (IF) signal into a first outbound radio frequency (RF) signal based on the second local oscillation when the wide bandwidth transceiver is in a second wireless standard mode and converts the outbound baseband and/or the low IF signal into a second outbound RF signal based on the first and second local oscillations when the wide bandwidth transceiver is in a first wireless standard mode.

Abstract: A portable memory device and method comprises a data storage component; and a wireless receiver operatively connected to the data storage component, wherein the wireless receiver is adapted to receive mobile TV signals. The portable memory device further comprises an interface component adapted to connect to a host computing device. The wireless receiver is adapted to receive radio signals. The wireless receiver is adapted to receive satellite signals. The wireless receiver comprises an antenna; a matching network operatively connected to the antenna; and a radio frequency (RF) receiver chip operatively connected to the matching network. The portable memory device further comprises a demodulator operatively connected to (or integrated in) the RF receiver chip. The data storage component comprises a flash memory unit comprising software code adapted to interface with a host computing device and process data on the host computing device.

Abstract: Reducing the cost and size of an FM radio receiver for receiving the North American weather band is aimed. An intermediate-frequency bandpass filter (IFBPF (80)) for limiting the band of a reception signal converted to an intermediate signal is configured with a variable passband width WF. WF is varied in accordance with reception conditions. When the user selects to receive signals in the weather band, a microcomputer (54) switches the tuning frequencies and sets WF to a lower limit of a range variable by the IFBPF (80). Adjacent-channel interference can thereby be suppressed during reception in the weather band, which has a smaller channel step than do other bands. In this configuration, there is no need to externally mount an expensive crystal filter to an IC for an FM tuner.

Abstract: An efficient configurable signal filter. The filter includes a first mechanism for receiving a first signal of a first type and a second signal of a second type. A second mechanism selectively filters the first signal during a first mode of operation, and filters the second signal during a second mode of operation. A third mechanism generates control signals. A fourth mechanism automatically configures the second mechanism to operate in the first mode of operation or the second mode of operation based on the control signals. In a specific embodiment, the first type of signal is characterized by a first rate, and the second type of signal is characterized by a second rate. The first signal and the second signal are digital ADC outputs. The second mechanism includes plural filter blocks, each having one or more Multiply-Accumulate (MAC) pipes. Each of the one or more MAC pipes include one or more MAC blocks that are each associated with a coefficient memory data structure of a coefficient memory.

Abstract: A receiver is arranged to receive at least two RF signals (51,52). A first RF signal of the at least two radio frequency signals (S] 5S2) is having a first center frequency, whilst a second signal of the at least two RF radio frequency signals (si,s2) is having a second center frequency, the receiver comprises a frequency shifter (10,11) arranged to shift the first center frequency to the second center frequency and a combiner (12) arranged to combine the frequency shifted first RF signal (S3) with the second RF signal (si) so as to obtain a combined RF signal (s4). The receiver further comprising a frequency down converter (15,16) arranged to frequency down convert the combined RF signal (s4) to a combined lower frequency signal and a demodulator (19) arranged to demodulate the combined lower frequency signal.

Abstract: Aspects of a method and system for sharing a single antenna for frequency modulation (FM) transmission or FM reception, and near field communication (NFC) are presented. Aspects of a system may include at least one circuit that enables, via a single antenna, simultaneous transmission of an FM signal and transmission of an NFC signal or reception of an NFC signal.

Abstract: A wireless receiver (100) is provided, comprising: a non-coherent signal detector (130) configured to receive an incoming signal and perform a non-coherent signal analysis in response to a first control signal; a coherent signal detector (140) configured to receive the incoming signal and perform a coherent signal analysis to extract coherently-encoded data from the incoming signal in response to a second control signal; and a receiver circuit (160) configured to process the coherently-encoded data. The non-coherently-encoded data provides an indication as to whether the incoming signal includes the coherently-encoded data, and the coherent signal detector is further configured to enter in a low power sleep state in response to a third control signal.

Abstract: A radio receiver having an FM band tuner, an AM band tuner, a controller coupled to both said tuners, and a radio data (RD) decoder for providing radio data. The RD decoder is coupled for receiving radio data from at least one of the tuners which is tuned to a radio program. The RD decoder is coupled to the controller for switching the radio receiver from FM band to AM band or vice versa based on radio program frequency correspondence data included in the radio data. The radio receiver is advantageous since it allows for automated cross switching between different frequencies whereon a same radio program is broadcast. This is particularly advantageous if the radio receiver, such as placed in a car, leaves the broadcast coverage area. User intervention is thus obviated.

Abstract: A radio front end utilizes at least one band pass filter to pass only the appropriate frequency band. Once the desired frequency band has been isolated it is converted to a digital format in an analog to digital converter and a digital signal processing device interprets the signal.

Abstract: A wireless audio distribution system may have a wireless transmitter, responsive to a plurality of audio input channels, for transmitting signals carrying the audio, a receiver, responsive to the transmitted signals for selecting one or more of the audio input channels to be reproduced in accordance with local setting selectors at the receiver. An additional audio source, such as a microphone, can be selectively used by for example the driver to talk on the cell phone or to make announcements to passengers via the wireless audio distribution system in accordance with a master settings selector which may be used to override local settings such as audio channel or volume selection.

Abstract: A Method and System for Optimizing Decibel Data Conversion. This invention provides an ability to convert linear signals into decibel units via digital logic circuitry. The resultant system can present information to users in real-time. This is made possible by performing an approximation function that is simple enough to be implemented directly in digital hardware, rather than through software executed by massive computing resources. An exemplary application for this technology is as a component of a surgical reactive electronic jamming system. This invention allows a surgical reactive jammer to determine precisely the correct jamming thresholds to apply in real-time. It allows signal surveillance equipment to survey the spectrum and display those results in dBm with far more efficiency than before. Finally, it enables a whole industry of communications related devices that need to do real time decibel conversion.

Abstract: A tuner is provided for selecting, independently of each other, a plurality of radio frequency channels for simultaneous reception. The tuner comprises a plurality of up converters whose outputs are combined in a combiner. Each up converter operates independently of the other up converters to select a channel from a multi channel input signal and to convert the selected channel to a first high intermediate frequency. The intermediate frequencies of the up converters are different from each other. The common signal from the combiner is supplied to a down converter which converts the signals at different high intermediate frequencies to signals at different lower intermediate frequencies. Thus, the signals from the combiner and from the down converter carry all of the selected channels at different intermediate frequencies. The signal from the down converter is subsequently processed to separate the selected channels and demodulate them.

Abstract: A differential signal receiver and method is disclosed. One embodiment relates to a receiver for receiving a differential signal. The receiver includes a first voltage-to-current converter that converts the voltage received at a first input to a first current, and a second voltage-to-current converter that converts a voltage signal received at a second input to a second current. A current subtractor provides a difference current of the first and second currents that is indicative of the differential signal.

Abstract: A receiver for AM and FM broadcast signals is disclosed. FM signals are received from an FM antenna and then processed by receive path circuitry or an FM tuner integrated circuit (IC) to produce audio output signals, such as digital audio output signals. The AM signals are received by an AM antenna and then up-converted using a fixed-clock to a frequency range nearer to the FM signal frequencies. The up-converted AM frequencies are then processed using the receive path circuitry. A multiplexer (MUX) allows for selection of the FM signals or the up-converted AM signals to be passed through for signal processing.

Abstract: An apparatus for converting a signal from a first analog format to a second analog format. The apparatus has an input port, a first converter, filters, first mixers, second converters, and an output port. The input port is configured to receive the signal. The signal has the first analog format. In an embodiment, the first analog format complies with the SCTE 40 2003 technical standard. In an embodiment, the second analog format is a conventional analog format. The first converter is coupled to the port and is configured to convert the signal to a first digital format. The filters are coupled to the first converter and configured to isolate a first channel of the signal from a second channel of the signal. The first mixers are coupled to the filters and configured to expand the first channel and the second channel to a second digital format. The second converters are coupled to the first mixers and configured to convert the first channel and the second channel to the second analog format.

Abstract: A wireless audio distribution system may include a wireless transmitter transmititing an encoded digital bitstream serially combining each of a plurality of audio input channels and control data, a wireless receiver receiving the transmitted bitstream, a manual selector switch to for selecting one or more of the audio input channels and a sound producing device reproducing the selected audio channels in accordance with the control data. A system may include a wireless receiver receiving an encoded digital bitstream combining each of a plurality of audio input channels with control data disbursed therein, a manual selector switch for selecting audio input channels and a sound producing device for selectively decoding and demultiplexing the selected audio channels to be reproduced in accordance with the control data.

Abstract: A receiver in which the sneaking noise from a crystal oscillator is reduced. A high-frequency amplifier circuit 11, a mixing circuit 12, a local oscillator 13, intermediate-frequency filters 14 and 16, an intermediate-frequency amplifier circuit 15, a limit circuit 17, an FM detection circuit 18, and a stereo demodulation circuit 19, an oscillator 20, and a PLL circuit 21 all constituting an FM receiver are provided as a one-chip component 10. A crystal oscillator 31 as an external component is connected to the oscillator 20. The natural-oscillation frequency of the crystal oscillator 31 is so set that the fundamental component and its harmonics are out of the reception band.