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5703955 Method and apparatus for multichannel sound reproduction  
A multichannel sound reproduction method and apparatus are described for achieving a higher proportion in the overall room size for acoustic/visual use, which can be used for the...
5701344 Audio processing apparatus  
An audio processing apparatus is arranged to be capable of attenuating only an unnecessary wind noise without cutting off the low frequency part of sounds picked up. In the apparatus, a first low...
5692051 Electronic equalization for recessed loudspeaker mounting  
An equalizing circuit, for compensating frequency response perturbations in a loudspeaker caused by a recessed mounting of the loudspeaker, includes an input for receiving an audio signal, a...
5682433 Audio signal processor for simulating the notional sound source  
An Audio Signal Processing system in which gain values are calculated for a plurality of output channels so that, from a notional listening position, a notional sound source may be perceived as...
5677957 Audio circuit producing enhanced ambience  
A circuit for use in connection with a stereo audio system to increase the ambience includes a differencing circuit for receiving a left stereo input and a right stereo input. The differencing...
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...
5666425 Plural-channel sound processing  
An artificial head (2) and a plurality of discrete monophonic microphones (8, 10, 12) are used to record one or more sound sources. The signals (14, 16, 18) from each of the microphones (8, 10, 12)...
5666422 Remote speaker for surround-sound applications  
A surround-sound system for use with conventional TV sets, using a wireless remote bipolar rear speaker (or two conventional speakers fed out of phase) for the surround (difference) channels. The...
5657391 Sound image enhancement apparatus  
A sound image enhancement apparatus for reproducing two-channel stereo signals with speakers, includes for each channel a first phase shifter and a second phase shifter for introducing different...
5642422 Digital surround sound method and apparatus  
Method and apparatus for implementing surround sound in an audio system having a number of audio output devices, and audio output buffers associated with the audio output devices adapted to output...
5642424 Device for connecting external sound generator  
A device for connecting an external sound generator having a plug and being incorporated in an apparatus having a circuit outputting an electrical sound signal. The external sound generator is, for...
5636283 Processing audio signals  
A system for mixing five channel sound which surrounds an audio plane. The position of a sound source is displayed on a VDU (16) relative to the position of a notional listener (31). The sound...
5633938 Audio track mixing processor  
An audio track mixing processor comprising phonic conversion circuitry for receiving a primary audio track of an input audio mix in stereo and transmitting a detector activation signal in mono; a...
5610986 Linear-matrix audio-imaging system and image analyzer  
An audio-imaging system includes at least first and second input channels for receiving first and second channel audio input signals and at least first, second and third output signals which are...
5604809 Sound field control system  
First and second processing circuits are provided for carrying out a reverberation process of an input signal, and first and second filters are provided for applying amplitude characteristics to...
5594801 Ambient expansion loudspeaker system  
A sound reproduction system has audio drivers for producing audio outputs in response to a left channel signal and a right channel signal and for producing an expanded acoustic image. The sound...
5590161 Apparatus for synchronizing digital data without using overhead frame bits by using deliberately introduced errors for indicating superframe synchronization of audio signals  
A transmitter for transmitting a low probability of detection rf signal, in which digitized audio data is contained therein. Each data frame contains deliberately introduced errors to synchronize a...
5579395 Stereo decoder with cross-talk compensation  
A circuit arrangement for converting of a stereo signal having a mid-plane signal and a side signal into an output signal for each of two audio signal channels. By this circuit arrangement, a...
5572591 Sound field controller  
According the present invention, a sound field controller for reproducing a sound field with presence comprising; input terminals for inputting an audio signal having a first and a second channel...
5557680 Loudspeaker system for producing multiple sound images within a listening area from dual source locations  
A loudspeaker system comprises two spaced-apart sound cabinets with the first cabinet housing a speaker driver directed toward a listener and couplable to a left channel signal to create a left...
5550920 Voice canceler with simulated stereo output  
A vocal canceler receives left- and right-channel input signals, and combines their non-vocal components into a single monaural karaoke signal. It then shifts the monaural karaoke signal by one...
5541999 Audio apparatus having a karaoke function  
An audio apparatus having a plurality of modes as a karaoke reproduction to superimpose a sound signal from a microphone on an audio signal from a stereo sound source. A subtracting circuit is...
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,...
5509078 Circuit for preventing crosstalk  
An operational amplifier is applied with an audio signal at a non-inverting terminal thereof for amplifying the audio signal. A crosstalk cancelling circuit is provided for reducing the output of...
5506907 Channel audio signal encoding method  
An encoding method and apparatus for audio signals for generating ten-channel audio signals from audio signals of a left channel, a left center channel, a center channel, a right center channel, a...
5497425 Multi channel surround sound simulation device  
A passive multi channel surround sound simulation device has a pair of input jacks for receiving a two channel stereophonic signal having a speaker level. An electronic circuit produces from the...
5487113 Method and apparatus for generating audiospatial effects  
A method and apparatus is disclosed for producing one or more audiospatial effects in an original audio signal. A spatially disorienting signal, typically a modified white noise pattern, is...
5459790 Personal sound system with virtually positioned lateral speakers  
A head mounted surround sound virtual positioning system that includes a video recorder (200), which is operable to have disposed therein a tape (202), having a surround sound audio track...
5440637 Listening and display unit  
A listening and display unit for playing and promoting audio recordings, including a display surface for promotional and instructional messages, two or more audio jacks connected by an audio cable...
5440638 Stereo enhancement system  
The sound field in a stereo reproduction system is enhanced by a preprocessor that removes a portion of the audio information that is common or substantially common to both the left and right...
5434921 Stereo image control circuit  
A stereo imaging circuit has a first channel input terminal, and a second channel input terminal; a variable resistance in circuit with each of the first and the second channel input terminals; a...
5426622 Multi-mode audio imaging control device having unitary control element  
A multi-mode audio imaging control device having unitary control element for use in recording and reproducing of multi-channel audio programs. The imaging control device includes a first channel...
5420929 Signal processor for sound image enhancement  
A signal processor for sound image enhancement of stereophonic signals provides fluctuating coherence between the left channel and right channel outputs by crossfeeding a high pass portion of the...
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...
5400411 Volume/balance control apparatus  
A volume/balance control apparatus includes a plurality of resistance arrays which correspond to a plurality of channels, a volume operator and a balance operator which generate volume and balance...
5400405 Audio image enhancement system  
Stereo processing circuitry is provided for modifying stereo signals so as to enhance the perception of imaging and ambience in non-ideal listening locations and confined environments such as the...
5394472 Monaural to stereo sound translation process and apparatus  
A process and apparatus are disclosed which provides increased perceptual location control and spatial characteristics to existing multi-channel material, said apparatus includes a plurality of...
5386082 Method of detecting localization of acoustic image and acoustic image localizing system  
A method of detecting localization of an acoustic image, in which an acoustic impulse is emitted from a sound source to a dummy of a human head, an acoustic sensor is provided to a portion of the...
5386473 Passive surround sound circuit  
A passive circuit for decoding surround-sound signals using a transformer having center-tapped primary and secondary windings. The line level left and right signals are introduced into the primary...
5384856 Acoustic system  
In a digital channel divider of the present invention, a plurality of filters are connected in parallel, which can set a desired transmission frequency response optionally for a digital input...
5381482 Sound field controller  
A sound field controller for generating apparent sound sources by adjusting the amplitude and delay time of a sound signal so that the sound will be perceived by plural listeners as sound coming...
5343531 Audio reproducing apparatus  
A vocal sound can be erased by a simple arrangement. An audio reproducing apparatus in which a sum signal and a difference signal of left and right signals of a stereophonic signal are supplied...
5341457 Perceptual coding of audio signals  
A technique for the masking of quantizing noise in the coding of audio signals is adapted to include geometric interpolation between the thresholds for a tone masking noise and for noise masking a...
5333200 Head diffraction compensated stereo system with loud speaker array  
A stereo audio processing system for a stereo audio signal processing reproduction that provides improved source imaging and simulation of desired listening environment acoustics while retaining...
5333199 Digital signal processor for simultaneously processing left and right signals  
A data input/output circuit of a digital signal processor of the invention includes a converter circuit for serial-parallel conversion of data, an R-channel dedicated input latch circuit, two...
5325435 Sound field offset device  
A sound field offset device having two channels, each of which includes a frequency selection filter for dividing a stereophonic input signal into two frequency bands by a given frequency falling...
5278909 System and method for stereo digital audio compression with co-channel steering  
Left right and surround components of a stereo signal are coded into a monaural and small co-channel providing volume steering for recreating a stereo effect with a substantially reduced bit rate....
5274708 Digital stereo sound enhancement unit and method  
A method and apparatus for processing digital stereo signals in a stereo system having a left and right channel in which digital information corresponding to the left and right channels is read...
5272756 Method and apparatus for determining phase correlation of a stereophonic signal  
A method and apparatus used for determining phasing correlation between left-channel and right-channel signals of a stereophonic audio signal is provided. The determination of the phase correlation...
5265166 Multi-channel sound simulation system  
A multi-channel sound simulation system for processing a stereophonic signal having a high frequency component for use with at least a pair of primary loudspeakers and a pair of secondary...