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8155335 |
Headset having wirelessly linked earpieces
A wireless headset includes a first earpiece and a second earpiece, where the first and second earpieces communicate with each other over a wireless link. In some configurations, the first earpiece...
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8139772 |
System and method for estimating channel condition based on filtered pilot energy signal
A receiver may estimate a channel condition based on a difference between a pilot energy signal and a filtered pilot energy signal. The receiver may further switch to a stereophonic mode when both...
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8139771 |
System and method for switching a mode of a receiver using block estimation
A system and method for switching a mode of a receiver between a monophonic and stereophonic mode is disclosed. The method can include generating a residual signal indicative of a noise level...
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8130990 |
Fully automatic switching on/off in hearing aids
In a hearing aid system comprising two hearing aids between which wireless signal transmission is provided. The hearing aids are automatically switched on and off. To this end, a field strength or...
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8081781 |
A/V amplifier and method for driving the same
For achieving an audio reproduction with high sound quality, in a multi-channel A/V amplifier, front speakers are driven with a parallel-drive bi-amplifier arrangement upon stereo reproduction. In...
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RE42949 |
Stereophonic audio signal decompression switching to monaural audio signal
A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the...
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8045840 |
Video-audio recording apparatus and method, and video-audio reproducing apparatus and method
A video-audio recording and reproducing apparatus (101) has a built-in stereo microphone (21a, 21b) and an external microphone connection terminal (32). The external microphone connection terminal...
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8014531 |
Stereo/monaural switching circuit and integrated circuit having the same
An adder mixes an L-channel sound signal and an R-channel sound signal with each other and then outputs a mixed signal. A switching unit performs a switching operation such that, if power is being...
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7991621 |
Method and an apparatus for processing a signal
An apparatus for processing an encoded signal and method thereof are disclosed, by which an audio signal can be compressed and reconstructed in higher efficiency. An audio signal processing method...
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7889871 |
Apparatus for multichannel sound reproduction system
The sound reproduction of a multichannel sound reproduction system with a plurality of speakers which is connected to the output of an FM stereo receiver is controlled by a control signal derived...
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7864962 |
System and method of routing audio signals to multiple speakers
A method and system for utilizing multiple speakers in a portable electronic device is disclosed. The method includes receiving an input at a user interface of a portable electronic device,...
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7751571 |
Sound signal processor and method for processing sound signal using the same
A sound signal processor and a method for processing a sound signal using the same enables the elimination of a plop noise generated in the course of a sound mode checking operation. The sound...
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7715567 |
Noise reduction in a stereo receiver
A method of 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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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 (Us(z)) and a stereo difference signal (Ud(z)), wherein a stereo to mono blending on basis of an attenuation of the stereo...
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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 (12)...
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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 (F1, F2, NA, NB) provided by at least one source (Q1, Q2), with a processing device (V) which forms...
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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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