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7539316 |
Configurable filter for processing television audio signals
A television audio signal encoder includes a matrix that sums a left channel audio signal and a right channel audio signal to produce a sum signal. The matrix also subtracts one of the left and...
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7515889 |
Scaling adjustment using pilot signal
A demodulator ( 10 ) converts television signals to video baseband signals and audio baseband signals including stereo signals representing a right channel signal value, a left channel signal value...
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7295631 |
Stereo demultiplexer
A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the...
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6978026 |
Circuit arrangement for gaining a stereo subcarrier and an RDS carrier
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...
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6813359 |
Apparatus and method for minimizing multipath interference
A method and apparatus for minimizing multipath interference for commercial FM signals which use SCA secondary signals in QAM format that includes tracking the time series of phase measurements of...
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6618486 |
Controller for FM 412 multiplex power regulation
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...
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6492913 |
Method and circuit for decoding an analog audio signal using the BTSC standard
An integrated circuit for decoding an analog audio signal includes a tuner that receives the analog audio signal and provides a sound intercarrier frequency signal. A digital demodulator receives...
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6272226 |
Apparatus and method for masking audio signals in a signal distribution system
An apparatus and method is provided for transmitting "masked" stereo audio signals in a signal distribution network such as a cable television system within the bandwidth constraints of...
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6118879 |
BTSC encoder
The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and...
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5848167 |
Distributed pre-emphasis equalizer
A distributed pre-emphasis equalizer comprises a partial pre-emphasizer and a (50) microsecond pre-emphasizer. The partial pre-emphasizer receives an input signal and produces a partially...
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5774555 |
Switched capacitor bandpass filter for detecting pilot signal
An apparatus for detecting a pilot signal. A phase detector detects a phase difference between a filtered amplitude-modulated pilot signal and a frequency divided signal, and a low pass filter...
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5696830 |
Circuit arrangement for deriving a quality signal dependent on the quality of a received multiplex signal
The method for obtaining the quality signal includes multiplying a digital multiplex signal (MPX) by respective reference carrier signals mutually phase shifted by 90° to each other, but otherwise...
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5684878 |
Video signal recorder video apparatus and audio signal receiver
The VCR (video cassette recorder) inserts an index signal into a video signal at the time of recording, when information which will later become inaccurate at the time of playback is included in...
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5673324 |
Radio receiver circuit for deriving at least one reception quality signal
In a circuit for deriving at least one quality signal that is dependent on the quality of a received signal, where the received signal is demodulated, a first auxiliary signal which is dependent on...
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5590203 |
Pilot signal detection circuit
A pilot signal detection circuit comprises: a PLL circuit for generating a reference signal whose frequency is same as and phase-synchronized with a carrier of a pilot signal extracted from...
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5561849 |
Apparatus and method for music and lyrics broadcasting
A system for broadcasting audio music and broadcasting lyrics for display and highlighting substantially simultaneously with the occurrence of the lyrics in the accompanying audio music is...
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5537613 |
Device and method for detecting pilot signal for two-carrier sound multiplexing system
A pilot signal detection circuit receives a supply of a pilot signal produced by frequency-modulation of a predetermined third frequency carrier signal by a first discrimination signal of a first...
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5507024 |
FM data-system radio receiver
An FM stereo radio data-system receiver has a front end including an FM discriminator that produces a composite signal composed of an AM stereo signal, including a 19 KHz pilot, and an AM...
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5506906 |
Radio receiver station-seeker stop-signal generator
Radio receivers which scan through a predetermined band of the radio spectrum, in a station-seeking mode, must independently detect whether the currently tuned frequency is the central frequency of...
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5499300 |
Stereo and dual audio signal identifying circuit
A stereo and dual audio signal identifying circuit including an FM detector receiving a second intermediate frequency signal, a bandpass filter, an AM detector. The circuit further including an...
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5471534 |
Devices, systems and methods for composite signal decoding employing interpolation filter
A device and method for composite signal decoding is provided in which an analog-to-digital converter (15) digitizes an incoming FM composite signal. The digitized signal is filtered by an...
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5467399 |
Coherent signal generation in digital radio receiver
A digital radio receiver generates coherent signals for synchronous detection without use of a phase-locked loop by employing an adaptive notch filter to cancel the desired signal. The cancelling...
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5442709 |
Circuit for decoding a multiplex signal in a stereo receiver
In a circuit for decoding a multiplex signal in a stereo receiver, where the multiplex signal contains a composite signal (L+R) in the base band, a subcarrier modulated with a difference signal...
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5406631 |
Stereo signal demodulator circuit and stereo signal demodulator using the same
A stereo signal demodulator circuit demodulates a stereo signal by using a PLL circuit including a voltage-controlled oscillator (VCO) for generating a first oscillation signal and a second...
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5396551 |
Headset amplifier
A headset amplifier, adapted for use with a voltage source such as a battery, includes a time-out-timer circuit for deactivating the headset amplifier after a first predetermined period of time and...
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5337196 |
Stereo/multivoice recording and reproducing video tape recorder including a decoder developing a switch control signal
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...
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5315583 |
Method and apparatus for digital audio broadcasting and reception
A radio broadcasting system for a composite signal consisting of a frequency modulated (fm) analog signal and a multicarrier modulated digital signal is provided which is resistive to multipath...
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5257312 |
Time-discrete stereo decoder
A receiver having a signal path incorporating a tuner, a demodulator circuit for supplying a stereo multiplex signal having a baseband stereo sum signal (L+R), a 19 kHz stereo pilot and a stereo...
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5241687 |
Phase controlling phase of local subcarrier signal to correspond to transmitted pilot signal
Apparatus for demodulating information signals frequency-modulated on an RF carrier signal carrying spectral components within the audio frequency range, a pilot carrier signal having an imparted...
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5222143 |
Compatible multivoice broadcasting receiver
A compatible multivoice broadcasting receiver is disclosed which can receive both Korean multivoice broadcasting and American multivoice broadcasting and commonly process the one-carrier component...
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5220607 |
Digital switching signal in stereo decoders and circuit array for generation thereof
In stereo receivers with digital decoding pulse generation, interference by the harmonics of the digital switching signal with signals in adjacent channels or with carrier signals in the sideband...
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5181249 |
Three channel audio transmission and/or reproduction systems
In order to permit three-component (left, right and back) audio signals (LS, RS, BS) to be conveyed by a three-channel (left, right and mono) transmission system and still permit stereo and mono...
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5054070 |
Stereo signal communication system and method
A system which enables transmission of a standard composite stereo sound signal, made up of baseband, subcarrier band and pilot signals, from a first location to a second location while requiring...
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4944010 |
Stereo demodulator and a demodulating method thereof
A stereo demodulator of a matrix system comprises: a first amplifier (23, 24, 25) for negative feedback amplification of a stereophonic composite signal, a first voltage-current converter (26) for...
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4933972 |
Stereo multiplex demodulator
A composite stereo signal comprised of a modulated signal modulated by a sum signal which is the sum of left and right channel audio signals and a difference signal which is the difference between...
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4887297 |
Apparatus for processing stereo signals and universal AM stereo receivers incorporating such apparatus
Multi-system or "universal" AM stereo receivers are provided which require no switching of the receiver's stereo decoder circuitry regardless of which AM stereo system signal is being received. In...
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4823390 |
FM stereo generator
An FM stereo generator for use as a modulator or in a test instrument or the like to provide the conventional 19 KHz and 38 KHz signals. The phase of the generated 19 KHz pilot subcarrier signal is...
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4811395 |
Two-tone test signal method for BTSC calibration
A two-tone test signal method for calibrating a BTSC monitoring system compensates for errors introduced into the monitoring system by unpredictable high frequency components of noise when testing...
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4750206 |
Adapter for TV stereo, SAP and auxiliary signals
An adapter is provided for use with a television receiver to detect and decode stereophonic audio signals, SAP signals or auxiliary signals that may be transmitted with the composite television...
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4736427 |
MTS test signal generator
An instrument for testing the multichannel sound circuits of a television receiver provides a plurality of discrete test signals respectively consisting of a carrier sine wave modulated with an...
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4723287 |
Demodulating system for multivoice system
A demodulating system for the multivoice TV system, which is constituted so that a tuner is tuned to receive the sum signal and the difference signal of an aural signal and a pilot signal which are...
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4694495 |
Integrable circuit for identifying a pilot tone
A circuit serves to extract one of two or more pilot tones which are modulated on an audio-frequency signal to select an appropriate decoder, and which cause a changeover to the appropriate decoder...
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4691356 |
AM/FM synchronizing circuit
A synchronizing circuit used for both an AM intermediate frequency signal and an FM composite signal. A phase detector, voltage-controlled oscillator, frequency divider and phase shifter are...
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4688252 |
IV SAP/stereo audio system
A TV SAP/stereo audio system includes a DC switch for selectively coupling the output of a stereo decoder and the output of a SAP detector to a stereo amplifier. A DC voltage, representative of the...
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4660193 |
Digital modulation method for standard broadcast FM subcarrier
A digital transmission system using standard FM broadcast stations employs an SCA subcarrier which is amplitude modulated with a second subcarrier modulated to have different phase orientations...
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4644580 |
Sound-multiplexed TV signal demodulator having electrically independent stereo and SAP demodulation means
A sound-multiplexed TV signal demodulator includes a stereo demodulation means having a first phase-locked loop of a first voltage controlled oscillator and also having a first frequency divider...
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4637044 |
Phase selectable circuit for use in a stereo demodulator
A circuit has two signal paths. The first path provides a signal with a selected magnitude and phase. The second path selectively provides either no signal or a signal with twice the magnitude and...
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4633496 |
Low-pass filter circuit
A low-pass filter circuit for suppressing a subcarrier contained in an FM stereo demodulation signal in which the output signal of the circuit is unaffected by magnetic distortion. The FM stereo...
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4630299 |
Digital circuit for decoding digitized, demodulated FM stereo signals
A simple digital filter having only a single multiplier operates to extract the pilot tone from a demodulated and digitized FM stereo signal. The number of poles in the filter is chosen so that the...
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4620314 |
Method of generating an approximately sinusoidal signal and circuit arrangement for implementing this method, particularly in a stereo demodulator
An approximately sinusoidal signal is generated by superimposing a first signal, which has a half cycle duration and corresponds to a triangular signal which is suppressed during every second half...
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