Sound reproduction system having enhanced low frequency directional control characteristics
Turning now to FIGS. 2A-B, an improved sound reproduction system 38 constructed in accordance with the teachings of the present invention, thereby achieving improved pattern control by eliminating th... Read More
Inventors: Janssen, Craig N.;, Assignee: |
Sound system gain and equalization circuit
It is an object of the invention to provide a new and improved equalizer circuit for processing and performing equalization on audio signals. It is a further object of the invention to provide such a ... Read More
Inventors: Maag, Clifford; Parker, Lance;, Assignee: Night Technologies International (Provo, UT) |
Signal processing circuit in an audio device
The present invention has been made in view of the above circumstances. Accordingly, an object of the invention is to provide a signal processing circuit which changes amplification gain of the variab... Read More
Inventors: Ishimitsu, Shunsuke; Kihara, Hisashi; Mori, Shuichi;, Assignee: Pioneer Electronic Corporation (Tokyo, JP) |
Noise suppression apparatus and recording medium recording processing program for performing noise removal from voice
A first object of the present invention is to provide a noise suppression apparatus capable of increasing auditory sound quality. A second object of the present invention is to provide a recording med... Read More
Inventors: Takahashi, Hidetaka;, Assignee: Olympus Optical Co., Ltd. (JP) |
Device for use in an audio signal processing system
It is an object of the present invention to provide a device for use in an audio signal processing system, designed to eliminate the aforementioned drawbacks, and which, at the same time, is straight ... Read More
Inventors: Zini, Sergio Luca; Ruggeri, Ruggero;, Assignee: |
Tone control circuit
What is claimed is: 1. An electronic tone control circuit comprising, an integrator circuit having an input terminal and an output terminal, a differentiator circuit having an input terminal and an ou... Read More
Inventors: Moskowitz, Jacob F.;, Assignee: Massachusetts Institute of Technology (Cambridge, MA) |
Frequency characteristic adjusting circuit
An object of this invention is to provide a simple-structured frequency characteristic adjusting circuit. Another object of this invention is to provide a frequency characteristic adjusting circuit wh... Read More
Inventors: Ishikawa, Kazumasa; Takahashi, Shin-ichi; Yoneyama, Masahide;, Assignee: Nippon Columbia Kabushiki Kaisha (Tokyo, JP) |
Method for reducing the search complexity in analysis-by-synthesis coding
The present invention is directed to a method of encoding a frame of input speech signal by performing a limited search of a tree-code excitation codebook to find a codeword achieving an optimal repre... Read More
Inventors: Mazor, Baruch; Veeneman, Dale E.;, Assignee: GTE Laboratories Incorporated (Waltham, MA) |
Electronic musical instruments which form musical tones by repeatedly generating musical tone waveform elements
Accordingly, it is the principal object of this invention to provide an improved electronic musical instrument wherein musical tones are formed by repeatedly generating musical tone waveform elements ... Read More
Inventors: Chibana, Masanobu;, Assignee: Nippon Gakki Seizo Kabushiki Kaisha (Hamamatsu, JP) |
Electronic musical instrument with editing of tone data
It is therefore an object of the present invention to provide an electronic musical instrument which stores a plurality of groups of tone data obtained by respectively sampling different tones into a ... Read More
Inventors: Ichiki, Tetsuji;, Assignee: Yamaha Corporation (Shizuoka, JP) |
Fast significant sample detection for a pitch detector
FIG. 1 shows an illustrative maxima locator which is the focus of this invention. The maxima locator is responsive to frames of digital samples representing an analog speech signal received via path ... Read More
Inventors: Thomson, David L.;, Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories (Murray Hill, NJ) |
Decoder for self-clocking serial data communications
To attain these and other objectives, at the receiving end of at least one serial data channel to which a receiving device connects, this invention provides simple but highly efficient and effective r... Read More
Inventors: Stewart, Robert E.;, Assignee: |
Power control method for a voltage controlled power amplifier and circuitry used in the method
I claim: 1. A method for controlling the rising and falling edges of an output pulse of a voltage controlled power amplifier (4) to track a waveform of a control pulse (TXC) when the power amplifier i... Read More
Inventors: Vaisanen, Risto;, Assignee: Nokia Mobile Phones Ltd. (Salo, FI) |
Digital communicationn system using partial response and bipolar coding techniques
It is therefore an object of the present invention to provide a digital communication system which combines the advantages of the partial response signalling and bipolar coding techniques and eliminat... Read More
Inventors: Hirosaki, Botaro; Shimizu, Hiroshi; Tsujimura, Yasuhiro; Yoshida, Toshihisa;, Assignee: NEC Corporation (Tokyo, JP) |
System for set-up of transmitters in high capacity digital radio links
OF THE PREFERRED EMBODIMENT FIG. 5 shows a block scheme of the generator 6 of the test signal of the invention. The invention includes four sinusoidal oscillators 7, 8, 9, 10 operating at different f... Read More
Inventors: Cardini, Lorenzo; Perego, GianCarlo; Nobili, Rocco;, Assignee: Telettra-S.p.A. (IT) |
Two loop automatic level control for power amplifier
The foregoing as well as other objects are achieved by a two loop combination of an adaptive power supply feedback control loop for an RF power amplifier where the power supply control is effected thr... Read More
Inventors: Apel, Thomas R.;, Assignee: The United States of America as represented by the Secretary of the Army (Washington, DC) |
Bias adjustment responsive to signal power
What is claimed is: 1. An improved base-emitter bias voltage correction arrangement for a power transistor adapted for processing signals carrying modulation which produces a varying average power lev... Read More
Inventors: Boyd, William M.;, Assignee: RCA Corporation (New York, NY) |
Automatic electrical power control circuit
A control circuit is provided for regulating the power amplification of communication signals. The circuit comprises an amplifying transmission path including a power amplifier, a controllable variabl... Read More
Inventors: Hotta, Toshinori; Yamamoto, Osamu;, Assignee: NEC Corporation (JP) |
Adaptive power control circuit
Accordingly, it is an object of this invention to provide an adaptive power control circuit for a transmitter amplifier which provides slow speed response for constant power conditions and high speed ... Read More
Inventors: Miller, Gene D.; Mitzlaff, James E.; Kwitkowski, Peter A.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Method and apparatus for controlling transient responses in a power amplifier
We claim: 1. In a power amplifier, a method for controlling transient responses, the method comprises the steps of: a) detecting when an output power adjustment is requested to produce a requested out... Read More
Inventors: Petersen, Michael W.; Fischbach, Clark D.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Diversity apparatus for a global positioning system antenna
Accordingly, it is an object of the present invention to provide a diversity apparatus for a global positioning system antenna capable of selecting an antenna having the best receiving sensitivity fro... Read More
Inventors: Kim, Kyung-Ho;, Assignee: Hyundai Electronics Industries Co., Ltd. (KR) |
Buffer circuit
With a view to solve the prior art problem described above, it is an object of the present invention to provide a buffer circuit which can operate with a satisfactory settling characteristic without c... Read More
Inventors: Matsuzawa, Akira;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Technique for determining signal dispersion characteristics in communications systems
FIG. 1 shows a portion 100 of an illustrative enhanced National Television System Committee (NTSC) television signal format which incorporates a training sequence 101 during time interval 102 pursuan... Read More
Inventors: Wang, Jin-Der;, Assignee: AT&T Bell Laboratories (Murray Hill, NJ) |
Phase logic demodulator
In accordance with the present invention there is provided a phase logic demodulator for a phase-shift keying, suppressed carrier communication system. The demodulator comprises a first and a second A... Read More
Inventors: Claxton, Dale H.;, Assignee: TRW Inc. (Redondo Beach, CA) |
Spectrum shaping microwave digital modulators
Turning to FIG. 1, a block diagram of a typical prior art signal transmission circuit is shown for modulating and forming a low capacity (single channel per carrier) microwave signal for transmission... Read More
Inventors: Lo, Gerald J. P.; Cuhaci, Misel; Hitchcock, N. S.;, Assignee: Canadian Patents and Development Limited (Ottawa, CA) |
PSK modulator with noncollapsable output for use with a PLL power amplifier
The present invention pertains to a PSK modulator for use with either wideband power amplifier up converter circuits or phase locked loop power amplifiers in a communications transmitter wherein one s... Read More
Inventors: McBiles, Carol D.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Spectrally efficient digital modulation method and apparatus
One object of the present invention is to provide a method of pulse shaping which permits generation of a digital pulse or signalling waveform of minimal length which can be transmitted at a high bit ... Read More
Inventors: Steel, Francis R.; Leitch, Clifford D.; Suarez, Jose I.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Amplifier with distortion reducing feedback
Accordingly, an object of the invention is to provide an amplifier device in which the distortion can be decreased sufficiently. An amplifier device according to this invention comprises: an amplifier... Read More
Inventors: Inohana, Haruyuki;, Assignee: Pioneer Electronic Corporation (Tokyo, JP) |
Pulse step modulator
The present invention is directed to minimizing dissipation by the unit step modules in a pulse step modulator without employing a monitoring circuit as noted from the prior art. The present invention... Read More
Inventors: Swanson, Hilmer I.;, Assignee: Harris Corporation (Melbourne, FL) |
High frequency pulse amplifier
I claim: 1. A high frequency power amplifier comprising: a power amplifier stage including a transistor having a grounded base, a collector and an emitter, an input matching network including an input... Read More
Inventors: Schucht, Peter;, Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DE) |
Audio Signal Processing 
