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7558549 |
Method and system for rejecting single-sided leakage into an amplitude modulated (AM) channel
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...
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7502478 |
Stereo audio headset interface and method that is compatible with mono headsets
A stereo headset interface that is compatible with mono for an audio playback device. A load in series between an audio output from a stereo headset driver and a ground of a mono headset plug...
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7457420 |
Method and system for detecting signal modes in a broadcast audio transmission
A Japanese BTSC audio broadcast signal has three modes of transmission: mono, stereo, or dual mono. The control channel centering at 3.5 fH is one of the three channels in the J-BTSC signal, and...
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7330551 |
Apparatus and method for controlling input signal level
Disclosed are an apparatus and a method for controlling an input signal level. The apparatus for controlling an input signal level according to the present invention includes: a memory for storing...
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7313240 |
Noise reduction in a stereo receiver comprising an expander
A FM broadcast compander system is combined with a conventional denoising system suited for FM receiver, wherein a noise indicator is determined by a subtraction of the conventionally transmitted...
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7292694 |
Noise reduction in a stereo receiver
A method to denoise a stereo signal which comprises a stereo sum signal (U s (z)) and a stereo difference signal (U d (z)), wherein a stereo to mono blending on basis of an attenuation of the...
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7251332 |
Portable audio devices
The components of a portable personal audio system include first and second audio signal source devices, such as an MP3 player ( 14 ) and telephone ( 16 ). These are connected via respective leads...
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7239710 |
Stereo radio receiver with noise suppression
For the purpose of largely suppressing the noise pulses caused in a stereo radio receiver in the reception signal, particularly by the ignition system of a motor vehicle, a digital field strength...
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7187775 |
Audio signal recording apparatus
When a plug of a monaural microphone is connected to an external microphone input section, a right channel terminal is connected to a GND terminal, and a voltage Vdet will be a GND potential. A DC...
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7162038 |
Audio source selection circuit
Audio source selection circuit (QW) for an audio signal processor with inputs for source signals (F 1 , F 2 , NA, NB) provided by at least one source (Q 1 , Q 2 ), with a processing device (V)...
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7110549 |
Noise reduction in a stereo receiver
A method to denoise a stereo signal comprising a stereo sum signal and a stereo difference signal, performs a frequency selective stereo to mono blending based on the masking effect of the human...
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7043034 |
Loudspeaker with single or dual channel input selector and lockout
A dual purpose loudspeaker incorporating at least two audio signal inputs and at least one switch is adapted to receive and reproduce either a single audio signal input or two audio signal inputs...
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6748085 |
Computer system with a common audio input for its audio circuitry
A portable computer system includes an audio circuit and a common audio input socket coupled to the audio circuit. This audio circuit has a controller and two amplifiers. Two types of external...
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6711268 |
Automatic stereo/monaural headphone
A stereo headphone employing a standard stereo headphone plug is adapted for automatically hearing a monaural signal at both earpieces, when accessing a typical monaural source. In the first...
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6707917 |
Monaural and stereo audio signal control system
A monaural and stereo audio signal control system for use in cable-signal set-top boxes selects signal processing paths as a function of the monaural and stereo nature of the incoming audio...
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6658116 |
Stereo radio receiver
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...
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5974153 |
Method and system for sound expansion
Monaural inputs are accepted for presentation to a pair of speakers. The output sound image from that pair of speakers is such that a listener will perceive that the sound is stereo and that...
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5920632 |
Apparatus for continuously switching a demodulator from stereo operation to mono operation, and vice versa
In a stereo decoder, channel separation takes place with the aid of a demodulator to acquire signals for stereo operation. At low received field strength there is a continuous switchover to mono...
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5784465 |
Stereo receiver
The invention is directed to reducing noises of a low density without causing the listener to feel a sense of incongruity. A received signal is subjected to frequency discrimination. The sound...
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5771293 |
Switching arrangement for mobile radio receivers
In the case of a switching arrangement for mobile radio receivers having a device for adjusting the stereo playback portion relative to the mono playback portion as a function of multipath effects,...
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5701345 |
Multipath interference reduction system and method
A multipath interference reduction system and method for smoothly reducing noise associated with FM stereo signal reception with an adjustable blend. The system includes a peak detector for...
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5699432 |
Circuit for mobile radio receivers
In a circuit for mobile radio receivers with a device for setting the stereo reproduction portion relative to the mono reproduction portion as a function of changes in the reception field strength,...
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5655025 |
Circuit for automatically recognizing and receiving mono and stereo audio signals
In a mono/stereo input circuit for use in an audio equipment, and more particularly in a circuit for automatically recognizing and receiving mono/stereo audio signals, although a mono connector is...
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5515442 |
Mono/stereo switching circuit
A mono/stereo switching circuit wherein first, second, and third switches operate in circuit which is arranged so that (1) when the first switch is engaged, and the mono/stereo switch is engaged,...
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5497206 |
Circuit for controlling an audio signal output of a television
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,...
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5445517 |
Adaptive noise silencing system of combustion apparatus
Pressure variation of combustion noise is detected by a microphone set in a combustion chamber, and the pressure propagation characteristic for the path from the gas flow control valve to the...
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5432854 |
Stereo FM receiver, noise control circuit therefor
A noise control system for a FM stereo receiver senses the presence of noise outside of the FM stereo transmission bandwidth at an output of a FM detector and uses variations of amplitude of the...
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5414774 |
Circuit and method for controlling an audio system
A circuit for directly differentiating stereo and mono signals regardless of whether a pilot carrier signal is present. The circuit generally includes a detection circuit coupled to a control...
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5406640 |
Method of and apparatus for producing predominate and non-predominate color coded characters for optical character recognition
Color coding of characters both for optical character recognition by a machine and for viewing by a human is provided by coloring a character with a predominate color distinguishable by humans and...
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5375188 |
Music/voice discriminating apparatus
A music/voice discriminating apparatus is composed of a signal processing portion for effecting the signal processing upon input acoustic signals, a music/voice deciding portion for discriminating...
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5347499 |
Circuit for selectively setting a monaural playback channel in a stereo audio apparatus
A circuit selectively sets a left/right monaural playback channel in a digitally signal-processed stereo audio apparatus. The circuit includes a channel selecting signal generator for generating a...
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5287547 |
Transmission and reception system
In a home bus system control signals and information signals are carried between a transmission station at one location and reception stations at other locations. There are plural signal sources at...
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5202925 |
FM stereophonic receiver
An FM stereophonic receiver including an FM detector circuit for detecting an intermediate frequency signal, and for providing a main signal and a sub signal in response to the detected...
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5155770 |
Surround processor for audio signal
A surround processor adapted to apply a stereo surround processing and a monaural surround processing to audio input signals of two channels to provide surround processed outputs, wherein a...
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5056148 |
Output circuit of audio device
An output circuit of a stereo type audio device includes a switch state detection switch which responds to an open state of a normally closed internal switch of an output jack of a first channel to...
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5036543 |
Noise suppression apparatus for FM receiver
A noise component is extracted either from FM-detected output or from the so-called signal meter in the intermediate frequency amplifier. The noise component is amplified and rectified to provide a...
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4977597 |
Stereo receiver circuit
Stereo receiver circuit for processing a multiplex signal comprising a pilot signal by means of a pilot signal detector which detects frequency components in the multiplex signal at the frequency...
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4860354 |
Arrangement for decoding a stereo multiplex signal
Arrangement for decoding a stereo multiplex signal, having a baseband stero signal (L+R), a stereo difference signal (L-R) which is amplitude-modulated on a suppressed sub-carrier, and a pilot...
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4833715 |
FM stereo receiver
An FM stereo receiver includes a level detecting circuit for detecting the received electric field intensity and a pseudo stereo circuit for changing the phase of an entered signal and outputting...
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4817151 |
Selective decoder for compatible FM stereophonic system utilizing companding of difference signal
A decoder for use in an FM stereo broadcasting system in which the usual difference signal S and a compressed version S' of the difference signal are transmitted, automatically selects on a...
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4747141 |
AM stereo signal decoder
A simplified stereo signal decoder is disclosed for use in an AM stereo receiver which receives composite AM stereo broadcast signals comprising a radio frequency carrier wave having amplitude...
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4703501 |
Sound multiplex receiver
A multiplex sound receiver in which a detection signal is extracted from a broadcast to indicate whether the broadcast is monaural, stereo, or multi-lingual. The detection signal is used for...
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4674121 |
Circuit for detecting the level of noise in FM signal for use in AM/FM receiver
A circuit is provided for detecting the level of noises in received FM signals in an AM/FM receiver which includes at least an FM intermediate-frequency amplifier, an FM detector connected thereto,...
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4646348 |
Blend control for low voltage stereo decoders
A blend control circuit for attenuating the L-R signal in a stereo system as a function of a d-c control potential. The circuit is designed to operate with a very low supply voltage and to provide...
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4466115 |
FM Stereo signal demodulator
An FM stereo signal demodulator for separating a composite stereo signal into left and right signals is disclosed wherein the amplitude of the 38 kHz signal necessary to separate the composite...
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4416024 |
Distortion reducing circuit in FM receiver
A distortion reducing circuit in an FM receiver comprises a distortion detector for receiving the output of an FM demodulating circuit. The distortion detector comprises a high pass filter, the...
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4408098 |
Receiver with field-strength dependent noise reduction control
Receiver comprising a field-strength detector for measuring the received signal amplitude and a noise reduction circuit connected thereto via a control signal generating device for reducing...
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4405834 |
Circuit for receiving two-tone/stereophonic programs
The invention relates to a circuit for use in a receiver which can receive two-tone/stereo signals. This circuit is intended to make a choice between mono or stereo reproduction of signal A or of...
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4399325 |
Demodulating circuit for controlling stereo separation
A demodulating circuit is capable of controlling stereo separation as a function of an electric field strength. An intermediate frequency signal not limited obtained from an intermediate frequency...
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4389536 |
Receiver for a two channel television sound
A decoder in a receiver for a two channel television sound comprises an adder and a subtractor for decoding a m.(L+R)-information on a first channel and a 2mR-information on a second channel into...
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