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4815133 Sound field producing apparatus  
A sound field producing apparatus operatively connected to a stereophonic sound source and adapted to supply audio signals to a loudspeaker system, comprising an indirect sound extracting circuit...
4815132 Stereophonic voice signal transmission system  
In a stereophonic voice transmission system for transmitting voice signals of a plurality of channels, a transmitting end encodes main data consisting of at least one channel voice signal among a...
4815131 Digital audio channel selection circuit  
A digital audio channel selection circuit for a serial audio signal having two multiplexed channels. The digital signal is converted from digital to analog and applied to two separate sample and...
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...
4803727 Transmission system  
A stereo coding system is described in which 7 kHZ bandwidth sum (L+R) and difference (L-R) signals are converted to digital form (11 and 12). The difference signal is then bandlimited (13) to 2...
4792974 Automated stereo synthesizer for audiovisual programs  
Surround stereo signals are synthesized from the composite or DME monaural sound tracks of audiovisual programs by use of multi-channel, computer-controlled digital circuitry and...
4790014 Low-pitched sound creator  
An analog sound signal is outputted. Low-frequency components are selected from the outputted analog sound signal so that a low-pitched sound signal is derived from the analog sound signal. A key...
4782530 Non-recursive system for expanding the stereo base of stereophonic acoustic diffusion apparatus  
A first and a second input signals, composing a stereophonic pair, are amplified in respective channels, added by adder means in a desired phase relationship, chosen between completely in phase...
4736426 Graphic balancer  
The present invention provides a graphic balancer comprising, in units of bands, level adjusting means (operational amplifiers 1L and 1R, resonators 2L and 2R, and volume controls 3L and 3R) for...
4700389 Stereo sound field enlarging circuit  
In a stereo sound field enlarging circuit, signals A and B applied to left and right input terminals are suitably processed so that signals A' and B' represented by the following equations are...
4698842 Audio processing system for restoring bass frequencies  
An audio processing system for injecting left and right channel audio signals with a signal having a fundamental frequency component that is half the frequency of the highest amplitude low...
4696035 System for expanding the stereo base of stereophonic acoustic diffusion apparatus  
A first and a second input signal, constituting a stereophonic pair are amplified in respective direct amplifier means so as to obtain a first and a second output signal. In order to obtain the...
4648113 Method and apparatus for providing a visual indication of a relationship between two signals  
A visual indication of the relationship between first and second electrical signals, such as the left and right channel signals in a stereophonic audio system, is provided through use of a video...
4646150 Apparatus and method for stereo television sound  
An apparatus and method are provided for receiving and reproducing stereo television sound. A transmitted television signal is received that contains a first component comprising the sum of first...
4642812 Sound field enlarging device and method  
A method for performing sound field enlargement in a digital audio reproducing apparatus such as a compact disc player. A sum is calculated between each received pair of right-channel and...
4635288 Electrical signal mixing apparatus  
Electrical signal mixing apparatus for recording studio or live performance comprising a plurality of input channels having means for conditioning input signals applied thereto, a plurality of...
4630298 Method and apparatus for reproducing sound having a realistic ambient field and acoustic image  
Apparatus for reproducing sound having a realistic ambient field and acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output. A...
4622878 Stereophonic system for electronic organs  
A stereophonic electronic organ system having two electrical-acoustic channels each including a loudspeaker separated from the other, note generating means for producing for each note in a musical...
4612663 Multichannel audio reproduction system  
A multichannel reproduction system for use with a source providing left (L) and (R) signals includes circuitry for developing difference signals L-R and R-L which are delivered to individual ones...
4611226 Television receiver incorporating a processing section for processing stereo/multichannel-sound signals  
A processing section for a television receiver for processing stereo/dual sound signals having a first sound carrier modulated by a first sound signal, and a second sound carrier modulated both by...
4608456 Digital audio scrambling system with error conditioning  
In the scrambling system, an analog audio signal is converted into a digital signal to provide a sequence of digital signal samples corresponding to the analog audio signal. Each digital signal...
4603429 Dimensional sound recording and apparatus and method for producing the same  
A sound recording having right and left information channels to drive right and left speakers, respectively. The right information channel has a left main stereo component having a pattern...
4586192 Soundstage boundary expansion system  
A system for providing the effect of an extended soundstage comprises a pair of stereophonic loudspeakers, each having a movable or vibrational element driven by a pair of voice coils including a...
4577540 Electronic musical instrument having a pan-pot function  
Digital pan-pot data supplied from a CPU is supplied to first and second analog multiplexers, and control signals are selected among a plurality of control signals obtained by dividing an output...
4567607 Stereo image recovery  
A method and apparatus for improving the accuracy in locating psychoacoustic images in plural channels of related audio signals. Signals are cross-fed from one channel to another in an...
4524451 Sound reproduction system having sonic image localization networks  
In a sound reproduction system having two loudspeakers located in front of a listener, an input audio signal is divided into a plurality of channel signals which are respectively applied through...
4503554 Stereophonic balance control system  
The disclosure relates to an audio signal reproduction system having one or more of the following features: (1) a loudspeaker having (a) a flat frequency response and (b) a predetermined power...
4496979 FM High-fidelity processor  
A processor providing high-quality audio signals from television sound channels by signal recovery using induced intermodulation between the picture carrier and the sound subcarrier signal. The...
4495637 Apparatus and method for enhanced psychoacoustic imagery using asymmetric cross-channel feed  
Enhanced pyschoacoustic imagery is achieved in an audio signal processing circuit for processing plural channels of related audio signals. Asymmetric bi-directional audio signal cross-feed is...
4433209 Stereo/monaural selecting circuit  
The present invention is directed to a stereo/monaural selecting circuit having a jack for supplying therefrom for reproduction a stereophonic sound signal output or a monaural sound signal output...
4421488 Aid for curing or mitigating stammering  
An aid for curing or mitigating stammering comprises two earphones and at least one microphone which are connected with an amplifier, and a delay unit in which the signal from the amplifier to one...
4415768 Tuning apparatus and method  
Right and left FM stereo signals are combined to form an L plus R value and subtracted to produce an L minus R value. The L minus R value is passed through a high-pass filter which mutes the high...
4410761 Stereo loudspeaker system for a picture reproducing screen  
A television system having a stereo loudspeaker system with a plurality of speakers and delay circuitry for successively delaying the left and right signals so that the speaker at the right end of...
4404429 Matching volume control characteristics for two channels  
First and second sound channels are provided for processing audio signals. Each sound channel includes means responsive to a D.C. control voltage for controlling the volume of the audio output...
4399328 Direction and frequency independent column of electro-acoustic transducers  
An electro-acoustic arrangement comprising a plurality of transducer units including five, seven or nine equally spaced transducers situated in line with the transducers connected to a...
4394537 Sound reproduction device  
A sound reproducing device particularly adapted for use in the passenger compartment of an automobile and having improved stereo separation and symmetrical frequency characteristics. The device...
4388494 Process and apparatus for improved dummy head stereophonic reproduction  
In stereophonic reproduction using a dummy head process, the frequency responses of the microphones are equalized by free-field matching filters to provide overall transfer constants independent...
4359601 Audio control system  
An audio control system comprised of an equalizer which divides and controls the level of a plurality of audio frequency bands and an electronic display which provides an illuminated indication of...
4356349 Acoustic image enhancing method and apparatus  
A method and apparatus are described for processing audio signals in a particular manner to achieve an enhancement in the perceived sound when the processed audio signals are projected by audio...
4355203 Stereo image separation and perimeter enhancement  
A stereo enhancement system utilizes a difference signal derived from the left and right stereo channels in which the difference signal is delayed, amplified, and then added into the appropriate...
4352953 Multichannel non-discrete audio reproduction system  
A method and apparatus for generating a plurality of audio outputs from first and second stereophonically related audio signals includes coupling the first audio signal out as a leftmost audio...
4349698 Audio signal translation with no delay elements  
Spatially correlated input audio signals are combined in a first combination of adder and subtracter to produce an input summation signal and an input difference signal, which are respectively...
4329544 Sound reproduction system for motor vehicle  
A sound reproduction system for a motor vehicle in which two channel signals are applied to two loudspeakers provided in the passenger compartment to reproduce the signals. The system includes a...
4292467 Control for audio receiver  
An audio receiver or other electronic device having a number of controllable functions is provided with control apparatus in which mechanical parts have been substantially eliminated. An...
4219696 Sound image localization control system  
A sound reproducing system for reproducing sounds from two loudspeakers located in front of a listener comprises a difference creating network for causing a ratio of sound pressures applied to...
4218585 Dimensional sound producing apparatus and method  
A sound reproducing system having right and left speakers which transmit right and left stereo sounds, respectively. The right signal, in addition to driving the right speaker, is inverted and...
4208546 Phase stereophonic system  
A system for reproducing phase stereophonic signals, in which the audio signals applied to one or more inputs of the system are split up at each input to pass along two parallel paths. Each of...
4192969 Stage-expanded stereophonic sound reproduction  
A stereophonic reproduction system comprises a localization network receptive of sterophonic signals to localize of sonic images at desired locations. A crosstalk canceler, connected in tandem...
4191852 Stereophonic sense enhancing apparatus  
An apparatus fo effectively increasing stereophonic sense when the distance between left and right loudspeakers is small is disclosed.This apparatus enlarges the apparent distance between the left...
4149036 Crosstalk compensating circuit  
A crosstalk compensating circuit for use in stereo reproduction having a phase shifter or attenuator provided in each of plural signal transmission paths to adjust the amplitude and phase of an...