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6788789 Phase conversion surround circuitry  
A phase-conversion surround circuitry gives surround effects to right- and left-channel audio signals. An audio difference signal between the right- and left-channel audio signals is delayed at a...
6782308 Robot performing dance along music  
In a music information reproducing device 1, a music information reproducing unit 2 reads a music information file 6 stored in a storage unit 4 and reproduces it as consecutive audible sound...
6771778 Method and signal processing device for converting stereo signals for headphone listening  
The invention relates to a method for converting signals in two-channel stereo format to become suitable to be played back using headphones. The invention also relates to a signal processing...
6768798 Method of customizing HRTF to improve the audio experience through a series of test sounds  
A method of customizing the HRTF for each tested individual for providing all tested individuals an optimum audio experience by providing convincing and realistic three-dimensional sounds....
6754350 Surround reproducing circuit  
A surround reproducing circuit includes a first adder for generating a difference signal of an L signal and an R signal which are inputted, a low-pass filter connected to an output side of the...
6738479 Method of audio signal processing for a loudspeaker located close to an ear  
A method of audio signal processing for a loudspeaker located close to an ear in use, the method consisting of or including:- creating one or more derived signals from an original monophonic input...
6735314 Expanded stereophonic circuit with tonal compensation  
A stereophonic processing system provided with spatial expansion of the stereophonic sound so that a pair of spaced-apart loudspeakers will acoustically appear to be spaced apart further then they...
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...
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...
6700980 Method and device for synthesizing a virtual sound source  
The invention relates to a method for synthesizing a virtual sound source in a system (40) which comprises at least a right and a left channel for transmitting a stereo signal and in which the...
6690799 Stereo signal processing apparatus  
To realize a stereo signal processing apparatus which effectively removes vocal signals, without degradation of stereo effect, with a simple construction. The stereo signal processing apparatus,...
6683962 Method and system for driving speakers with a 90 degree phase shift  
A method and system for providing enhanced coupling of a stereophonic pair of full-range loudspeakers or subwoofers to all room modes of a laterally symmetric listening room wherein the preferred...
6683959 Stereophonic device and stereophonic method  
The data put to the digital filter operation and the data not put to the digital filter operation are synthesized together at a predetermined distribution ratio to form a stereophonic sound image....
6658310 Method of entering audio signal, method of transmitting audio signal, audio signal transmitting apparatus, and audio signal receiving and reproducing apparatus  
A method of entering an audio signal into a data processing apparatus, in which analog audio signals of at least two channels as the audio signal are digitized by and transmitted from an audio...
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...
6643375 Method of processing a plural channel audio signal  
A method of processing a plural channel audio signal representing a three dimensional sound-field for generation by respective left and right loudspeakers arranged at a given distance from a...
6636608 Pseudo-stereo circuit  
A pseudo-stereo circuit is provided which processes an input monophonic signal into stereophic audio signals. A phase-shift circuit shifts a phase of the input monophonic signal by a phase shift...
6621906 Sound field generation system  
A signal of a whole audio frequency band is input to input lines CHL and CHR having band-split digital band pass filters BFL1 to BFLn and BFR1 to BFRn, attenuators ATL1 to ATLn and ATR1 to ATRn,...
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 maximum...
6614910 Stereo sound expander  
A stereo sound expander reproduces a realistic sound image in three dimensions by coupling modified and unmodified stereo signals. By not modifying a Head Related Transfer Function (HRTF) for one...
6608902 Stereo signal separation circuit and application thereof  
A stereo separation circuit includes a pair of amplifiers and a pair of divider circuits. Each of the amplifiers is coupled to receive a stereo signal (e.g., a left stereo signal or a right stereo...
6606388 Method and system for enhancing audio signals  
A technique for enhancing audio signals generated from compressed digital audio files is described. The technique uses a Bass Maximizer module, a Harmonic Exciter module and a Quasi Stereo module....
6587565 System for improving a spatial effect of stereo sound or encoded sound  
A system for improving a spatial effect of stereo sound or encoded sound when producing three dimensional image sound signals from signals of stereo channel includes a spatial effect enhancing...
6584202 Method and device for reproducing a stereophonic audiosignal  
A method and an arrangement for reproducing a stereophonic or multi-channel audio signal in a space, particularly in the passenger compartment of a motor vehicle, is described Loudspeakers for...
6546105 Sound image localization device and sound image localization method  
A sound image localization apparatus comprises a signal source for outputting an audio signal; a localization angle input unit for receiving an angle of a sound image to be localized; a...
6522751 Stereophonic signal processing apparatus  
A stereophonic signal processing apparatus, capable of reproducing sounds of musical instruments in high fidelity while effectively eliminating vocal signals, includes a right filter combination...
6519344 Audio system  
There is provided an audio system which suppresses standing waves. An audio signal source (1) outputs audio signals (SR) and (SL) which are then supplied to reproducing loudspeakers (3) and...
6507657 Stereophonic sound image enhancement apparatus and stereophonic sound image enhancement method  
A stereophonic sound image enhancement apparatus comprises a first filter for changing a phase of a left channel input signal in response to a frequency of the left channel input signal; a second...
6504933 Three-dimensional sound system and method using head related transfer function  
A three-dimensional sound system and a method utilizing a head related transfer function (HRTF) for providing a three-dimensional sound effect from a two-channel stereo signal source having first...
6504934 Apparatus and method for localizing sound image  
The present invention includes producing a first processed signal which localizes sound image at a first localization position and a second processed signal which localizes sound image at a second...
6498857 Method of synthesizing an audio signal  
A method of synthesizing an audio signal having left and right channels corresponding to an extended virtual sound source at a given apparent location in space relative to a preferred position of...
6498856 Vehicle-carried sound reproduction apparatus  
A vehicle-carried sound reproduction system which reproduces a sound image forwardly of a passenger of a vehicle in which it is incorporated. The vehicle-carried sound reproduction apparatus...
6473497 Digital telephone set  
An aural information is expanded correspondingly to a compression system and a compression rate when a receiving signal from a digital telephone circuit is the aural information and a control...
6470087 Device for reproducing multi-channel audio by using two speakers and method therefor  
A device and a method for reproducing a multi-channel audio signal with only two speakers preserving the sound field of multi-channel audio reproduction, thereby providing vivid realism to a user...
6449368 Multidirectional audio decoding  
An audio crosstalk-cancelling network that may be implemented in software, such that when run in real time on a personal computer, the canceller has very low mips requirements and uses a small...
6442277 Method and apparatus for loudspeaker presentation for positional 3D sound  
A method and device for placement of sound sources in three-dimensional space via two loudspeakers. This technique uses an efficient implementation which consists of binaural signal processing and...
6424719 Acoustic crosstalk cancellation system  
A system for acoustic crosstalk cancellation which uses a loudspeaker arrangement including three loudspeakers, with the center loudspeaker set forward of the two outside loudspeakers. This...
6385320 Surround signal processing apparatus and method  
A surround signal processing apparatus and method can realize sound image localization and have reverberation effects. In the apparatus, left and right impulse measuring sections measure left and...
6360200 Process for reducing redundancy during the coding of multichannel signals and device for decoding redundancy-reduced multichannel signals  
A redundance reduction method used in coding multichannel signals is proposed, where signals available in digitized form are predicted. A prediction error is computed, which is subsequently...
6356639 AUDIO DECODING APPARATUS, SIGNAL PROCESSING DEVICE, SOUND IMAGE LOCALIZATION DEVICE, SOUND IMAGE CONTROL METHOD, AUDIO SIGNAL PROCESSING DEVICE, AND AUDIO SIGNAL HIGH-RATE REPRODUCTION METHOD USED FOR AUDIO VISUAL EQUIPMENT  
A sound image localization device which includes a signal source for outputting an audio signal, a signal divider for dividing the audio signal output from the signal source into two digital audio...
6307941 System and method for localization of virtual sound  
A system and method for providing improved virtual sound images. One or more spatial cues of an audio signal may be modulated within a described range to increase the clarity and perceived...
6292570 Surround sound  
To improve listener perceived characteristics multi-channel sound reproduction systems are known which include a surround sound channel. It is preferred to reproduce the surround sound signal...
6285767 Low-frequency audio enhancement system  
The present invention provides an audio enhancement apparatus and method which spectrally shapes harmonics of the low-frequency information in a pair of audio signals so that when reproduced by a...
6282247 Method and apparatus for digital compensation of radio distortion over a wide range of temperatures  
Radio distortion in a radio signal is compensated for in a digital modem in a wireless communication system over a wide range of temperatures. Actual frequency responses of components in the...
6281749 Sound enhancement system  
The present invention provides an audio enhancement apparatus and method which spectrally shapes the differential information in a pair of audio signals so as to create an immersive,...
6246772 Wireless headphone/speakers sound field control circuit  
A wireless headphone/speakers sound field control system, which includes a wireless signal receiver, a left speaker connected to the wireless signal receiver through a left differential amplifier...
6243476 Method and apparatus for producing binaural audio for a moving listener  
A system for generating loudspeaker-ready binaural signals comprises a tracking system for detecting the position and, preferably, the angle of rotation of a listener's head; and means, responsive...
6192086 Digital sub-systems and building blocks for a mostly digital low-cost BTSC compatible encoder  
A BTSC-compatible encoder that is integrated onto an application specific integrated circuit includes a low pass filter that is responsive to a digital representation of an audio signal that has a...
6178245 Audio signal generator to emulate three-dimensional audio signals  
A system produces, based on samples of a single-channel input audio signal and an indication of a particular orientation of the listener relative to a source of the audio signal, a multi-channel...
6122381 Stereophonic sound system  
A stereophonic sound system is disclosed, having a source of stereophonic signals which contain a right signal and a left signal as well as further signals which supplement the right and left...