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6118875 Binaural synthesis, head-related transfer functions, and uses thereof  
A method and apparatus for simulating the transmission of sound from sound sources to the ear canals of a listener encompasses novel head-related transfer functions (HTFs), novel methods of...
6111958 Audio spatial enhancement apparatus and methods  
A spatial enhancement system broadens the sound image of a stereo signal. The system emphasizes dissimilarity between the left and right channels by (i) boosting the level of the dissimilar...
6097558 Digital audio signal transmission apparatus with data blocks of varying sizes  
Digital audio signal transmission is provided for digitally processing, for transmission in a digital VCR format, audio signals from a plurality of channels into a digitized audio data segmented...
6067360 Apparatus for localizing a sound image and a method for localizing the same  
It is an object of the present invention to provide an apparatus for localizing a sound image capable of achieving so called "surround-effect" sufficiently with a simple structure while...
6067072 Audio equipment and method of displaying operating thereof  
The present invention is concerned with an audio equipment capable of processing video signals and a method of displaying operation of the acoustic equipment. An input selector switch 1 is...
6052470 System for processing audio surround signal  
A surround signal processing system receives a surround signal and also a program of processing the surround signal. The received surround signal is decoded into multiple-channel signals according...
6038323 Stereophonic image enhancement system for use in automobiles  
A stereophonic image enhancement signal processing system for vehicular sound systems provides a symmetrical improvement in imaging for listeners located at the left and right regions of a vehicle...
6026168 Methods and apparatus for automatically synchronizing and regulating volume in audio component systems  
A signal regulator regulates an auxiliary signal based upon a primary signal scaled by an external amplifier. The signal regulator receives the primary signal with an unscaled level. Processing...
6009178 Method and apparatus for crosstalk cancellation  
A system and method are disclosed for providing a two channel signal to the ears of a listener through an audio system. The audio system includes a plurality of audio signals which are played...
6005947 Technique for enhancing stereo sound  
An acoustic signal processing subsystem for an electronic stereophonic audio system is disclosed. The acoustic signal processing subsystem will modify electronic audio signals such that sound...
6002774 Arrangement, a system, a circuit and a method for enhancing a stereo image  
A stereophonic audio signal processing arrangement for variably enhancing a stereo image, wherein the stereo image enhancement is reduced at high signal levels so as to reduce distortion. The...
5995631 Sound image localization apparatus, stereophonic sound image enhancement apparatus, and sound image control system  
A stereophonic sound image enhancement apparatus subtracts a right input signal from a left input signal and amplifies the subtracted signal to produce a difference signal, and also subtracts a...
5991385 Enhanced audio teleconferencing with sound field effect  
An audio teleconferencing apparatus and method provide an audio sound field among a plurality of teleconferencees creating a sense of a virtual conference table having a spatial location for each...
5987141 Stereo expander  
A stereophonic audio processing system having left and right stereophonic sound channels with respective loudspeakers therefor is presented. The system is provided with spatial expansion of the...
5983087 Distributed digital signal processing for vehicle audio systems  
A radio with a tuner and other program sources uses a digital signal processor (DSP) to enhance the audio signal and to generate a stream of digital data including audio data and control data...
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...
5974152 Sound image localization control device  
A sound image localization control device reproduces an acoustic signal on the basis of a plurality of simulated delay times and a plurality of simulated filtering characteristics as if a sound...
5970152 Audio enhancement system for use in a surround sound environment  
An audio enhancement system and method for use in a surround sound environment creates a more diffuse and continuous sound field from a multi-channel, multi-speaker reproduction environment....
5946400 Three-dimensional sound processing system  
A three-dimensional sound processing system which provides a listener with three-dimensional sound effects by reproducing a sound image properly positioned in a reproduced sound field. A filter...
5943427 Method and apparatus for three dimensional audio spatialization  
A digital audio spatialization system that incorporates accurate synthesis of three-dimensional audio spatialization cues responsive to a desired simulated location and/or velocity of one or more...
5937071 Sound field expanding apparatus with improved tone control system  
A sound field processor having amplitude/phase conversion circuits for left and right channels of a stereophonic signal. The amplitude/phase conversion circuits for left and right channels have...
5930733 Stereophonic image enhancement devices and methods using lookup tables  
A stereophonic image may be enhanced by splitting the left and right input audio signals into a plurality of left and right output signals in a plurality of audio frequency bands and then...
5917916 Audio reproduction systems  
Stereophonic sound reproduction apparatus comprising an input means (2) for producing binaural signals, cross-talk cancellation means, (10) loudspeaker means, (20, 22) headphone means, (26) and a...
5912975 Method and circuit for creating phantom sources using phase shifting circuitry  
In portable stereo radio receivers and television receivers, the loudspeakers therein may be separated only by a limited amount. This severely restricts the stereo image created by the...
5910990 Apparatus and method for automatic equalization of personal multi-channel audio system  
An apparatus for automatically equalizing a personal multi-channel audio system, and a method therefor, are disclosed. White noises which are generated by a transfer characteristic measuring...
5896456 Automatic stereophonic manipulation system and apparatus for image enhancement  
The manipulation system and apparatus receives electronic signals which are to be processed and recorded for playback as enhanced stereophonic audio signals from two laterally spaced loudspeakers...
5892831 Method and circuit for creating an expanded stereo image using phase shifting circuitry  
In portable stereo radio receivers and television receivers, the loudspeakers therein may be separated only by a limited amount. This severely restricts the stereo image created by the...
5892830 Stereo enhancement system  
A stereo enhancement system processes the difference signal component generated from a pair of left and right input signals to create a broadened stereo image reproduced through a pair of speakers...
5890125 Method and apparatus for encoding and decoding multiple audio channels at low bit rates using adaptive selection of encoding method  
A split-band coding system combines multiple channels of input signals into various forms of composite signals and generates spatial-characteristic signals representing soundfield spatial...
5889867 Stereophonic Reformatter  
A method of creating an impression of sound from an imaginary source to a listener. The method includes the step of determining an acoustic matrix for an actual set of speakers at an actual...
5889843 Methods and systems for creating a spatial auditory environment in an audio conference system  
A method and a system for audio communication between a plurality of users at a plurality of sites utilizes a set of audio input sensors at each site. Each set of audio input sensors binaurally...
5883962 Method and apparatus for spatially enhancing stereo and monophonic signals  
A method and apparatus is disclosed which spatially enhances stereo signals without sacrificing compatibility with monophonic receivers. In accordance with one embodiment of the present invention,...
5883961 Sound system  
A method of synthesizing a set of filters comprises locating first and second loudspeakers at first and second locations, respectively, coupling a first component of an audio program to the first...
5878145 Electronic circuit and process for creation of three-dimensional audio effects and corresponding sound recording  
Acoustic signals received by the ears are controlled by feeding back and filtering the signal to be applied to the speaker, rather than by use of a feedforward filter. The feedback filter may...
5872851 Dynamic stereophonic enchancement signal processing system  
A stereophonic signal processing system for enhancing the perception of sonic dimension and imaging in a sound reproduction system having at least two stereo speakers. The system provides a...
5850455 Discrete dynamic positioning of audio signals in a 360° environment  
A software algorithm is disclosed which allows audio signals to be positioned discretely and dynamically in a 360° environment, the center of which is assumed to be the position of the...
5844993 Surround signal processing apparatus  
A surround signal processing apparatus for reproducing surround sound through a pair of speakers arranged at front left and right positions with respect to a listener, based on a monaural rear...
5838800 Apparatus for enhancing stereo effect with central sound image maintenance circuit  
A system for enhancing the effect of stereo audio signals while maintaining the central audio image includes an expander circuit that tracks the monaural information that is common to both left...
5835895 Infinite impulse response filter for 3D sound with tap delay line initialization  
An audio processing system is used to process digital audio signals that represent sound emanating from a source that is moving through three dimensional space. The audio processing system has a...
5822438 Sound-image position control apparatus  
To obtain a sound-broadened image and a clear sound-image discrimination image when producing plural kinds of sounds, the electronic musical instrument and the like provides a sound-image position...
5822437 Signal modification circuit  
A circuit is disclosed for modifying a first signal and a second signal from a signal source providing at least two signals. The circuit including devices for forming signal components from the...
5815578 Method and apparatus for canceling leakage from a speaker  
A system and method are disclosed for canceling the leakage from a speaker.
5812677 Acoustic signal processing method and apparatus  
Main voice processing is performed on an acoustic signal at a basic sampling frequency fs within one period of the basic sampling frequency fs to allow the main voice processing implemented...
5812672 Method for reducing data in the transmission and/or storage of digital signals of several dependent channels  
A method for reducing data during the transmission and/or storage of the digital signals of several dependent channels is described in which the dependence of the signals in the channels, e.g. in...
5799094 Surround signal processing apparatus and video and audio signal reproducing apparatus  
A surround signal processor reproduces multi-channel audio signals with a pair of left and right rear surround signals via a pair of speakers arranged at front left and right positions roughly...
5796845 Sound field and sound image control apparatus and method  
The apparatus of the invention calculates filter coefficients for controlling sound field and sound image, based on a plurality of first impulse response signals and a pair of second impulse...
5768394 Surround audio signal reproducing apparatus having a sub-woofer signal mixing function  
A surround audio signal reproducing apparatus for reproducing a multi-channel audio signal to generate a surround sound effect is provided. The apparatus contains a surround decoder, a sub-woofer...
5764775 Audio processing unit for mixing L channel and R channel of CD/CD-1 audio signal  
Audio process units for controllably mixing L-channel and R-channel portions of a CD/CD-I audio signal each use a single attenuator (or digital multiplier) for developing L*G(LL), L*G(LR), R*G(RR)...
5761313 Circuit for improving the stereo image separation of a stereo signal  
By using special frequency response manipulation in the difference channel of a stereo signal, the stereo image will appear to extend beyond the actual placement of the loudspeakers. This is...
5748745 Analog vector processor and method for producing a binaural signal  
An analog vector processor and method for converting right and left mono and stereo audio input signals through a series of six amplifier blocks and two control blocks using a series of unique...