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| Number | Title | Issue Date |
| 7155020 | Audio circuitry for dynamics reduction A circuit for processing an audio signal includes an input stage to which the audio signal is applied and an output at which the processed audio signal is presented. The circuit comprises first and second input stages (11, 12) having nonlinear performance cur... | 12/26/2006 |
| 7054403 | Phase-Locked Loop A phase lock circuit has a signal path to which a phase comparator, a loop filter and a voltage control oscillator are connected in series, the phase comparator being adapted to compare the phase of an input signal VIN with the phase in the output signal ... | 05/30/2006 |
| 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 complementary encode/decode system while permitting compatible d... | 03/21/1989 |
| 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, orienting the cutting stylus to be driven at a tracking angle of l... | 08/27/1985 |
| 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 corresponding portions of the signal output from each channel. Featur... | 11/22/1983 |
| 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 from a recording into components which are separately del... | 09/20/1983 |
| 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 signals recorded thereon. The player includes expander circuitr... | 06/14/1983 |
| 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 transducers. A predetermined low frequency band of the audio ... | 10/26/1982 |
| 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 bandwidth for greater than the audio range to reproduce si... | 01/19/1982 |
| 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 wave signal. The modulated signal is separated from a composi... | 01/29/1980 |
| 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 distortion compensation circuit operates, upon being suppli... | 01/30/1979 |
| 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, and then supplied to loudspeakers, so as to reproduce a natu... | 10/17/1978 |
| 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 angle-modulated signal which is separated from a signal pic... | 06/20/1978 |
| 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 T93, TT or TQ is small in level. When the level is low, noises are apt to be offensive to a listener's ear, but the repr... | 02/21/1978 |
| 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 of a three channel program to be obtained from the two cha... | 02/14/1978 |
| 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 encoded main-channel signals and a carrier signal of a frequ... | 01/24/1978 |
| 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 |
| 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 |
| 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 signal and the angle-modulated difference signal, and recording... | 02/15/1977 |
| 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 |
| 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 recording medium in a multiple-frequency manner. More specifi... | 10/12/1976 |
| 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 matrix circuit and a specific one of the input terminals o... | 09/28/1976 |
| 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 source with different channels at different times, and a cont... | 09/21/1976 |
| 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 |
| 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 directed to reducing or eliminating crosstalk from a main chann... | 03/23/1976 |
| 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 parallel resonant circuit includes one circuit element of th... | 03/16/1976 |
| 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 pass the signal band, which is variable. A control signal g... | 03/09/1976 |
