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4815068 |
Audio encoder for use with more than one decoder each having different characteristics
A "hybrid" encoder has a characteristic action suitable for substantially full complementary playback in an audio signal transmission or recording system using decoders designed for one type...
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4538256 |
Method and apparatus for cutting information into a record carrier
Method and apparatus for producing a mechanically reproducible recording in a metal disk record by operating an electrically excited cutting stylus to cut a modulated groove in the record,...
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4417103 |
Stereo reproduction with gapless splicing of pitch altered waveforms
A time compression audio reproduction system has two stereo channels with means for synchronously operating the pitch correction means in each channel to obtain time coincidence between...
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4406001 |
Time compression/expansion with synchronized individual pitch correction of separate components
A time compression/expansion audio reproduction system of the type that provides pitch correction by repetitive variable time delay achieves improved performance by separating the reproduced signal...
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4388654 |
Video disc player with selectively enabled audio signal expander circuitry
A video disc player designed to play video disc records having either non compressed monophonic wide band audio signals or video disc records having compressed stereophonic limited band audio...
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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...
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4312060 |
Preamplifier for phonograph pickup
The preamplifier has a first stage or section of low or unity gain, such as an emitter-follower circuit, which also isolates the preamplifier from impedance variations of the cartridge, and with a...
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4186281 |
Multichannel record disc reproducing apparatus
A multichannel record disc reproducing apparatus comprises a first phase locked loop circuit including a phase comparator and a voltage controlled oscillator for demodulating an angle-modulated...
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4137430 |
System for recording a signal with tracing and tracking distortion compensation on a record disc
In a record disc recording system for recording a signal f(t), the cutter stylus has a cutting angle θ and operates responsive to a signal to be recorded on a record disc. A tracing and tracking...
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4121059 |
Sound field expanding device
In a sound field expanding device, left and right channel sound signals of a two channel stereo are respectively divided into several frequency bands, adjusted on levels and phases, mixed again,...
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4096360 |
Multichannel record disc reproducing system
A multichannel record disc reproducing system comprises at least two phase-locked loops. Each loop includes a phase comparator and a voltage-controlled oscillator for respectively demodulating an...
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4075425 |
Multi-directional sound signal reproducing system
The present invention is to increase the carrier level so as to improve the S/N ratio when the factor T 93 , T T or T Q is small in level. When the level is low, noises are apt to be offensive to...
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4074083 |
Stereophonic sound system particularly useful in a cinema auditorium
A network is described which processes two channel stereophonic sound programs for playback through left, right and center sound reproduction channels. Use of the network allows certain advantages...
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4070552 |
Multi-directional stereo multiple recording apparatus with constant acceleration cutting
A multi-directional stereo multiple recording and reproducing apparatus is disclosed in which a plurality of sound source signals are encoded to a plurality of main- and sub-channel signals, the...
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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...
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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...
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4008381 |
Multichannel record disc recording system
A multichannel record disc recording system comprises: a circuit for shaping sum and difference signals from multichannel signals, angle modulating the difference signal, multiplexing the sum...
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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...
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3985978 |
Method and apparatus for control of FM beat distortion
A method and apparatus is disclosed for reducing crossover modulation distortion generated at a sub-channel and for minimizing phase differences between 4-channel signals that are recorded on a...
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3983334 |
Matrix and equalizer circuit with gain control
A combined matrix and equalizer circuit comprises a matrix circuit for operating with gains on a plurality of input signals. A feedback loop feeds back from a point between output terminals of the...
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3982071 |
Multichannel sound signal processing system employing voltage controlled amplifiers
A circuit for controlling the application of one or more audio signals to a plurality of channels incorporates a series of voltage controlled amplifiers for interconnecting an individual signal...
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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...
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3946165 |
Method and apparatus for control of crosstalk in multiple frequency recording
A method and apparatus is disclosed for reducing distortion between signals that are recorded on a recording medium in a multiple-frequency manner. More specifically, the present invention is...
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3944755 |
Composite filter circuit
A composite filter circuit comprises a first series resonant circuit connected to a single common resistor, resonating at a first frequency, and exhibiting a low-pass filtering characteristic. A...
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3943303 |
Abnormal sound eliminating system in record disc reproducing apparatus
In a record disc reproducing apparatus, an abnormal sound eliminating system comprises a variable filter in the transmission system for a signal reproduced from a record disc. The filter does not...
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3896271 |
System for a multichannel record disc with crosstalk compensation provided during recording
A cutting and recording system for multichannel discs has means for applying beforehand crosstalk compensation correction components to the recording signals. This compensation cancels a crosstalk...
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3839602 |
SYSTEMS FOR RECORDING AND/OR REPRODUCING FOUR CHANNEL RECORD DISKS HAVING MIXED SUM AND DIFFERENCE SIGNALS RECORDED ON OPPOSITE GROOVE WALLS
A system records a four channel record by forming sum and difference signals for each two of four channel signals. The difference signals are compressed, but only with respect to a specific...
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3803367 |
RECORDING SYSTEM FOR A MULTICHANNEL RECORD DISK
A system for recording a plurality of signals in a single sound groove in a record disk by multiplexing a direct-wave sum signal and an angular-modulated difference signal for every two signal...
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3484566 |
DISC RECORDING SYSTEM WITH PRECOMPENSATION BY SUCCESSIVE DIFFERENTIATION
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3457374 |
RECORDING METHOD AND APPARATUS FOR COMPENSATING THIRD ORDER DISTORTIONS
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3390888 |
Recording device
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3293364 |
Sound signal correction system
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3229038 |
Sound signal transforming system
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3229048 |
Recording system
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3195067 |
Frequency compensated gain control circuit
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3190969 |
Method for stereophonic re-recording
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3162728 |
Stereo-sound reproducing device
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3162730 |
Stereophonic amplifier circuit providing improved low frequency response
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3162727 |
Stereophonic reverberation system
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3153702 |
Volume compensated stereophonic phonograph
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3094587 |
Improved dual channel amplifier system
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3077519 |
Stereophonic phonograph
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3075052 |
Methods of producing grooved records
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3067292 |
Stereophonic sound transmission and reproduction
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3067287 |
Stereophonic sound transmission systems
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3013125 |
Stereophonic recording
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2980766 |
Balance indicator for stereophonic sound systems
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2962561 |
Method and apparatus for dual sound track recording
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