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| Number | Title | Issue Date |
| 5757927 | Surround sound apparatus A surround sound apparatus wherein a decoder decodes directionally encoded audio signals for reproduction via a loudspeaker layout over a listening area wherein the signals are decoded by a matrix. The coefficients of the decoding matrix are such that at ... | 05/26/1998 |
| 5727068 | Matrix decoding method and apparatus A matrix decoding system and method generates left, right, center and surround output signals by adding and subtracting weighted versions of first and second input signals. The output signals are generated using a variable matrix to combine the input sign... | 03/10/1998 |
| 5671287 | Stereophonic signal processor A frequency-dependent linear audio signal processor takes source signals S in input signals and provide directionally spread directionally encoded output signals. The processor directionally encodes with constant gain magnitude frequency components of the... | 09/23/1997 |
| 5602923 | Theater sound system with upper surround channels An improved theater surround sound system incorporates a screen top speaker and an overhead speaker driven by corresponding upper surround channels to more accurately reproduce sounds produced from above the listener. These top surround channels are encod... | 02/11/1997 |
| 5594800 | Sound reproduction system having a matrix converter Matrix reproduction decoding means derive from input signals intended to feed a stereophonic plurality of loudspeakers output signals intended to feed a second greater plurality of loudspeakers in a stereophonic arrangement covering a sector of directions... | 01/14/1997 |
| 5524054 | Method for generating a multi-channel audio decoder matrix In an MPEG multi-channel audio signal processor, a decoder requires a respective decoder matrix for determining different output channels from coded audio data. Some transmitted information indicates basic parameters of the multi-channel system. This info... | 06/04/1996 |
| 5341430 | Device for effecting a modification in a stream of transmission cells A device for effecting a modification in a stream of transmission blocks detects a transmission block to be modified and generates a detection signal via detection means, which comprises delay means for effecting a delay in the stream of transmission bloc... | 08/23/1994 |
| 5222059 | Surround-sound system with motion picture soundtrack timbre correction, surround sound channel timbre correction, defined loudspeaker directionality, and reduced comb-filter effects Spectral imbalance (alteration in timbre) when playing home video versions of motion pictures having soundtrack equalized for playback in a room whose room-loudspeaker system is aligned to the standard motion picture theater X-curve is overcome by timbre ... | 06/22/1993 |
| 5043970 | Sound system with source material and surround timbre response correction, specified front and surround loudspeaker directionality, and multi-loudspeaker surround Spectral imbalance (alteration in timbre) when playing home video versions of motion pictures is overcome by re-equalization according to a unique correction response curve which compensates for the equalization for playback in large theater-sized auditor... | 08/27/1991 |
| 4933768 | Sound reproducer A television receiver includes a volume control circuit (4) for controlling levels of sound signals corresponding to a left channel, a right channel, a center channel and a surround channel and speakers (6 to 10) corresponding to these channels. The telev... | 06/12/1990 |
| 4807217 | Multi-channel stereo reproducing apparatus The present invention provides a multi-channel stereo reproducing apparatus which can reproduce a recording medium such as an audio disc or the like in which in order that users can enjoy screen musics or the like reproduced at, for example, a concert hal... | 02/21/1989 |
| 4532647 | Automatic dimension control for a directional enhancement system A directional enhancement system for quadrophonic sound systems wherein the improvement comprises an automatic dimension control. The automatic dimension control utilizes a plurality of limiting devices, each of which has an input terminal, an output term... | 07/30/1985 |
| 4525855 | Variable rate and variable limit dimension controls for a directional enhancement system The disclosed invention relates to directional enhancement systems and provides apparatus for enhancing the directional content of information contained in a plurality of composite signals derived from preceding decoding apparatus of the system. The appar... | 06/25/1985 |
| 4491801 | Matrix circuit for processing plural signals Unbalanced two input signals are applied to a buffer. The buffer provides to an balanced adder with balanced buffer output signals. The adder adds the buffer output signals and generates an unbalanced addition output signal. The addition output signal is ... | 01/01/1985 |
| 4316058 | Sound field transmission system surrounding a listener Systems for uniformly reproducing a sound field surrounding a listener are disclosed utilizing three channels of audio information signals. One channel provides signals representative of total sound pressure (a sum signal) and the two remaining channels p... | 02/16/1982 |
| 4262170 | Microphone system for producing signals for surround-sound transmission and reproduction A system including a compact array of microphones in combination with signal combining circuitry, especially suited for use with surround-sound sources, for producing two composite signals LT and RT corresponding to those required by an SQ-matrix-type qua... | 04/14/1981 |
| 4149031 | Multichannel matrix logic and encoding systems Apparatus and methods relating to "quadrasonic" encoding and decoding systems, including synthetic supplementary channel systems, matrix logic systems, and systems employing stereo compatible matrix variations.... | 04/10/1979 |
| 4139729 | Sound reproduction system with matrixing of power amplifier outputs In a surround sound reproduction system the required number of power amplifiers is reduced by effecting at least part of the decoding operation by the manner in which the various loudspeakers are connected to the outputs of the power amplifiers while pres... | 02/13/1979 |
| 4115666 | Discrete 4-channel stereo recording and/or reproducing system compatible with matrix systems A discrete 4-channel stereo recording and reproducing system which is based on a regular matrix type 4-channel stereo system and compatible with both of a regular matrix system and a CD-4 type 4-channel stereo system. In the audio frequency band, the same... | 09/19/1978 |
| 4095049 | Non-rotationally-symmetric surround-sound encoding system In a surround-sound encoding system which does not have full circular or square symmetry, a third channel is added to a basic two channel system in such a way that the third channel may be reduced in amplitude or restricted in frequency without substantia... | 06/13/1978 |
| 4085291 | Synthetic supplementary channel matrix decoding systems Apparatus and methods relating to "quadrasonic" encoding and decoding systems, including synthetic supplementary channel systems, matrix logic systems, and systems employing stereo compatible matrix variations.... | 04/18/1978 |
| 4045621 | Recording system for a multichannel record disc A multichannel record disc recording system uses two channels of direct wave sum signals and two channels of angle-modulated wave difference signals which are multiplexed and recorded in one sound groove on a record disc. During recording, a tracing disto... | 08/30/1977 |
| 4016373 | Multichannel record disc recording system A multichannel record disc recording system comprises circuits for forming first and second sum signals and first and second difference signals respectively from signals of two different channels of four channels. The first and second difference signals, ... | 04/05/1977 |
| 4016374 | Multichannel record disc recording system with signal level control A multichannel record disc recording system comprises operation circuits for forming first and second sum signals and first and second difference signals respectively, from the signals of two pairs of channels, or a total of four channels. The first and s... | 04/05/1977 |
| 4001518 | Discrete four-channel disc reproducing system A compatible discrete four-channel (CD-4) stereophonic reproducing system which comprises a detecting circuit for detecting a sub-channel signal. A control means detects an over-deviation of the sub-channel signal and deactivates a noise elimination switc... | 01/04/1977 |
| 3991283 | Multichannel record disc reproducing system A multichannel record disc reproducing system comprises a circuit for demodulating an angle-modulated wave picked up from a multichannel record disc. A circuit detects abnormal phenomena of the angle-modulated wave, whereupon an expansion circuit accompli... | 11/09/1976 |
| 3979564 | 4-Channel stereo recording and reproducing method A method for recording and reproducing a 4-channel stereo signal wherein the reproduced signal can be used with conventional discrete signal or matrix stereophonic systems. Four related audio signals are matrixed to produce a first main channel audio sign... | 09/07/1976 |
| 3968331 | Encoding and decoding system for quadraphonic sound Method of encoding quadraphonic signals in four channels, in which for each side the front signal is recorded together with the phase-shifted back signal, and the back signal is recorded together with the supplementarily phase-shifted front signal.... | 07/06/1976 |
| 3953686 | Multichannel record disc recording system A multichannel record disc recording system comprises automatic gain control circuits for each of the multichannels a control voltage, representing the phases and levels of the multichannel signals, control the gain of the automatic gain control circuits.... | 04/27/1976 |
| 3944735 | Directional enhancement system for quadraphonic decoders Method and apparatus for enhancing the directional content of information recorded or transmitted as four separate channels on a medium having only two independent tracks or channels and subsequently decoded into four signals each of which contains predom... | 03/16/1976 |
| 3940698 | Muting circuit A muting circuit comprises, substantially, a gate circuit for passing or not passing input signals and a circuit for forming a control signal for controlling the gating operation of the gate circuit. The control signal forming circuit has a circuit for de... | 02/24/1976 |
| 3936619 | Four-channel stereophonic reproducing system for reproducing discrete CD-4 four-channel stereo disc There is provided a four-channel stereophonic reproducing system wherein each muting circuit comprises a limiter for limiting the carrier level of a frequency-modulated signal to a predetermined level, a control circuit actuated by the output of the limit... | 02/03/1976 |
| 3936618 | Multichannel record disc reproducing system and apparatus A multichannel record disc reproducing system and apparatus comprises a phase-locked loop for demodulating an angle-modulated wave signal in a multiplexed signal picked up from a multichannel record disc. A synchronous detector compares the phases of the ... | 02/03/1976 |
| 3931482 | Four-channel stereophonic reproducing system for reproducing discrete four-channel stereophonic discs In a four-channel stereophonic reproducing system of the type in which a first, second, third and fourth audio signals are reproduced from two stereophonic composite signals which are respectively comprised of a left side signal consisting of a main chann... | 01/06/1976 |
