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| Number | Title | Issue Date |
| 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 filter for changing a phase of a right channel input signal... | 01/14/2003 |
| 6507658 | Surround sound panner A method and apparatus implements a novel surround sound panning paradigm. Rather than controlling the x-y position of a perceived sound source within a linear grid, the perceived sound is characterized by specifying perceived arrival energy as a function... | 01/14/2003 |
| 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 localization position; multiplying one of the first and th... | 01/07/2003 |
| 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 includes a correction filter circuit for converting input digita... | 12/24/2002 |
| 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 a listener in use is described. The information in the chan... | 12/24/2002 |
| 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 (listener). The device for reproducing multi-channel audio ... | 10/22/2002 |
| 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 loudspeaker crosstalk cancellation, followed by panning in... | 08/27/2002 |
| 6430293 | Recording and play-back two-channel system for providing a holophonic reproduction of sounds A two-channel sound recording and play-back system for providing a holophonic reproduction or play-back of sounds is herein disclosed. The two-channel recording system comprises cables and electronic apparatus for providing a stereophonic type of recordin... | 08/06/2002 |
| 6430294 | Sound image localization method and apparatus, delay amount control apparatus, and sound image control apparatus with using delay amount control apparatus A delay amount control apparatus is arranged by a delay amount detecting unit, a delay amount saving unit, a delay unit, and a cross-fade mixing unit. The delay amount detecting unit detects as to whether or not the delay coefficient is changed. The delay... | 08/06/2002 |
| 6421446 | Apparatus for creating 3D audio imaging over headphones using binaural synthesis including elevation The apparent location of sound signals as perceived by a person listening to the sound signals over headphones can be positioned or moved in azimuth, elevation and range by a range control block and a location control block. Several range control blocks a... | 07/16/2002 |
| 6418226 | Method of positioning sound image with distance adjustment A sound apparatus is constructed for directing a sound image of a virtual sound source at a designated source point to a listener in a virtual sound field. In the sound apparatus, a database provisionally memorizes acoustic transfer characteristics of the... | 07/09/2002 |
| 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 right impulses of a head related transfer function for an i... | 05/07/2002 |
| 6363155 | Process and device for mixing sound signals The present invention is directed to a process and device for mixing a plurality of sound signals. The process includes separating each sound signal and selectively delaying each separated sound signal. The process also includes selectively weighting each... | 03/26/2002 |
| 6361439 | Game machine audio device and information recording medium A game machine audio device is provided which can obtain sounds to which a sense of distance in virtual game space has been imparted, while hardly altering the sound volume. Frequency components in sounds generated are altered according to distances in vi... | 03/26/2002 |
| 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 signals respectively for two channels, and a first signal ... | 03/12/2002 |
| 6332026 | Bass management system for home theater equipment A setup to be used in a home theater or sound reproduction system for handling low frequency sound signals with a signal source providing several full bandwidth digital sound channels and at least one digital low frequency subwoofer channel includes a del... | 12/18/2001 |
| 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 localization of a virtual sound image. Interaural time delay, inte... | 10/23/2001 |
| 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 without having rear loudspeakers, so using the front stereophon... | 09/18/2001 |
| 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 loudspeaker, a listener perceives the loudspeaker as having... | 09/04/2001 |
| 6285766 | Apparatus for localization of sound image A sound image localization apparatus comprises crosstalk canceling means and direction localizing means, wherein first the crosstalk canceling means first subject an input sound signal to crosstalk cancellation, and then, the direction localizing means su... | 09/04/2001 |
| 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 to the head-tracking means, for generating the binaural si... | 06/05/2001 |
| 6222930 | Method of reproducing sound A sound reproducing system in which virtual image orientation processing of audio signals for at least two rear speakers disposed in directions from a listener close to the right-back direction from the listener is performed by a virtual sound orientation... | 04/24/2001 |
| 6223090 | Manikin positioning for acoustic measuring A computer controlled, three-dimensional, iterative and reiterative, closed-loop system for automatically positioning the head of a manikin situated on a motorized stand relative to a stationary sound source in order to perform accurate near-field Head-Re... | 04/24/2001 |
| 6219426 | Center point stereo field expander for amplified musical instruments The CPS (center point stereo) system of the present invention is directed to stereo sound reinforcement of live music, particularly with electronically-implemented instruments such as guitars and keyboards that provide a musical source signal at line leve... | 04/17/2001 |
| 6195434 | Apparatus for creating 3D audio imaging over headphones using binaural synthesis An apparent location of a sound source is controlled in azimuth and range to a listener of the sound using headphones by a range control block that has variable amplitude scalers and a time delay and by an azimuth control block that also has variable ampl... | 02/27/2001 |
| 6181800 | System and method for interactive approximation of a head transfer function A head related transfer function (HRTF) is used to simulate positional three-dimensional sound. The HRTF accounts for the frequency response, delays and reflections of the human body. The HRTF is unique to each individual and is affected by the shape and ... | 01/30/2001 |
| 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 output audio signal that emulates an audio signal as emanati... | 01/23/2001 |
| 6175631 | Method and apparatus for decorrelating audio signals A system and method are described for rendering a left rear surround input signal at a left rear virtual speaker location and rendering a right rear surround input signal at a right rear virtual speaker location. The method includes phase shifting the lef... | 01/16/2001 |
| 6169806 | Computer, computer system and desk-top theater system A computer including an extraction unit for extracting source signals of surround sound from data received via a medium, and a processor for decoding and converting the source signals into audio signals of a plurality of channels. The processor includes t... | 01/02/2001 |
| 6154549 | Method and apparatus for providing sound in a spatial environment A method and apparatus for providing sound in a spatial environment is provided. Control is provided over the perceived position of sound sources, including perceived positions behind the listener or listeners. The invention is effective for multiple simu... | 11/28/2000 |
| 6130948 | Sound field processor with sound field expanding apparatus A sound field expanding apparatus is formed from an L-channel sound field expanding circuit and an R-channel sound field expanding circuit that have substantially the same circuit structure. Left and right stereophonic input signals of two channels are in... | 10/10/2000 |
| 6125115 | Teleconferencing method and apparatus with three-dimensional sound positioning A computer network teleconferencing system is provided in which audio signals are coupled to or associated with source indicators, such as source addresses in TCP protocol packets. Three-dimensional spatialization transforms are applied to audio data acco... | 09/26/2000 |
| 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 signals to convey a three-dimensional sound impression. The rig... | 09/19/2000 |
| 6122382 | System for processing audio surround signal A multiplexing-resultant surround signal is decoded into multiple-channel signals including at least a first left-channel signal, a first right-channel signal, and a rear-channel signal. Samples of the rear-channel signal are thinned out to generate a thi... | 09/19/2000 |
| 6111959 | Sound spreader A sound spreader accepts one or more input signals and generates a plurality of output signals, wherein the output signals are transmitted to a plurality of transducers each generating acoustical energy that together comprise a sound field. The spreader p... | 08/29/2000 |
| 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 components, (ii) providing spectral equalization to enhance the p... | 08/29/2000 |
| 6091894 | Virtual sound source positioning apparatus A virtual sound source positioning apparatus includes a channel signal generating section for generating first and second channel signals, a first component signal indicative of a component of the first channel signal, and a second component signal indica... | 07/18/2000 |
| 6084970 | Mono-stereo conversion device, an audio reproduction system using such a device and a mono-stereo conversion method The invention provides a method and a device for converting a monaural signal into a stereo signal by selectively allocating frequency bands of the input signal to left or right outputs. In this way, some instruments will be present only in the left outpu... | 07/04/2000 |
| 6078669 | Audio spatial localization apparatus and methods Audio spatial localization is accomplished by utilizing input parameters representing the physical and geometrical aspects of a sound source to modify a monophonic representation of the sound or voice and generate a stereo signal which simulates the acous... | 06/20/2000 |
| 6072877 | Three-dimensional virtual audio display employing reduced complexity imaging filters A three-dimensional virtual audio display method is described which includes generating a set of transfer function parameters in response to a spatial location or direction signal. An audio signal is filtered in response to the set of transfer function pa... | 06/06/2000 |
