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Document Title |
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7577263 |
System for audio signal processing
A sound reproduction system comprising a digital audio signal input ( 1 ), a digital audio signal processor ( 2 , DSP) and a digital audio signal output ( 3 ) wherein the digital signal processor (...
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7542815 |
Extraction of left/center/right information from two-channel stereo sources
A digital audio signal processing system and method transforms two-channel stereo time-domain data into the frequency domain. Vector operations are performed upon the frequency-domain data by which...
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7409066 |
Method of adjusting filter parameters and an associated playback system
To improve upon a method of adjusting at least one filter parameter such as the mid-frequency of at least one filter unit provided with a playback system for audio signals, this filter unit being...
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7406144 |
Clock generator circuit using phase modulation technology and method thereof
A clock generator circuit, comprising: a multi-phase clock signal generator for generating a plurality of clock signals having a same frequency but difference phases according to a reference clock...
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7085389 |
Infinite slope loudspeaker crossover filter
An improvement to inventor's prior art loudspeaker crossover filter invention is described. A substantially flat network input-impedance characteristic across the audible frequency range is...
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6975733 |
Watermarking of digital images using wavelet and discrete cosine transforms
The present invention relates to a method for embedding a watermark into a black and white or color digital image [D(x)]. Basically the inventive method comprises the steps of transforming the...
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6931135 |
Frequency dependent excursion limiter
A circuit and method provides for the protection of transducers from over excursion, particularly for the protection of transducers for audio loudspeakers. A frequency dependent excursion limiter...
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6707919 |
Driver control circuit
A driver control circuit ( 10 ) that enhances a steep crossover slope while permitting selective shaping or adjusting of its in-band frequency response with a minimum number of components. The...
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6665408 |
Dynamic bass control circuit with variable cut-off frequency
A circuit for providing a variable amount of bass control on an input signal dependent on a signal level of the input signal includes a high-pass filter, a variable impedance shunt connected to the...
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6411717 |
Switched capacitor filter with a neutral bypass setting
An SC filter with intrinsic anti-alias function for adjustably decreasing or increasing the amplitude of audio signals in a predetermined frequency range. The SC filter includes a filter module...
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6396934 |
Analog audio filter for high frequencies
The present invention relates to an active analog filter including a differential amplifier, an output of which provides a filtered signal and a non-inverting input of which is connected to a...
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6310959 |
Tuned order crossover network for electro-acoustic loudspeakers
A crossover network for partitioning by frequency and electrical audio signal from an amplifier into a plurality of frequency bands for presentation to respective drivers or transducers. Such a...
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6201873 |
Loudspeaker-dependent audio compression
The invention is an audio compression system for reducing distortion arising primarily from excessive loudspeaker excursion. For a given input audio signal, the maximum signal magnitude (or...
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5737432 |
Split-band clipper
A split-band clipper which generates less distortion, minimizes or reduces the occurrence of all IMD, or at least will minimize and reduce the occurrence of widely space IMD, and reduce the...
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5675656 |
Power amplifier with clipping level control
In a power amplifier, a control device employing a dual ganged potentiometer is connected in the feedback circuits of successive amplifier stages to increase the gain of the front end stage while...
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5548650 |
Speaker excursion control system
A speaker excursion control circuit for driving relatively small diameter speakers at their maximum output while assuring minimum distortion of acoustical output from such transducers detects...
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5533135 |
Crossover system
An audio crossover system having two crossover networks, one suited to the auditory preferences of women and the other to the auditory preferences of men. The former attenuates mid-range...
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5495527 |
Telephone privacy device
A telephone privacy device includes first and second connectors that are mateable with a telephone handset and a telephone base, respectively. The handset includes a microphone, and the device...
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5384855 |
Audio system for vehicular application
Electronic crossover audio systems and methods in accordance with the invention provide flat frequency response and the feeling of three-dimensional music reproduction with a well defined image of...
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5361381 |
Dynamic equalizing of powered loudspeaker systems
A powered loudspeaker system has a cabinet. The cabinet has at least one electroacoustical transducer and a power amplifier coupled to the electroacoustical transducer. Dynamic equalization...
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5349301 |
Multiple amplifier system for a car
A multiple amplifier system comprises a sound source, a power source, an electronic crossover network for dividing an audio signal from the sound source into a plurality of frequency ranges. Each...
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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...
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5245278 |
Device for the processing of a signal coming from a sensor with a derivative type of response
The disclosure relates to devices for the measurement of signals in the field of wideband phenomena. More precisely, a device is disclosed for the processing of electrical signals coming from a...
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5237619 |
Sound mixer with band separation
In a mixer there is a plurality of preamplifiers followed by a plurality of tone control groups connected to a plurality of voltage followers to which a series of active filters is connected, for...
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5168526 |
Distortion-cancellation circuit for audio peak limiting
Apparatus for reducing distortion in a peak limited audio siganl. The amount of low-frequency spectral energy in the input audio signal is determined for a peak limited signal and used to control...
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5146506 |
Isolator circuit for an audio system
An isolator circuit for an audio system has an operational amplifier provided between a signal source and an amplifier. A capacitor and a resistor connected in series are connected between each...
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5129006 |
Electronic audio signal amplifier and loudspeaker system
An electronic audio signal amplifier and loudspeaker system comprises a preamplifier circuit, a plurality of L electronic crossover networks, a plurality of M output amplifiers and an associated...
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5129005 |
Electrodynamic loudspeaker
In a loudspeaker with a number of speaker units, each connected across one power amplifier to a diplexer, the power amplifiers having negative source impedance (-R 1 ) are utilized. The diplexer...
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5111508 |
Audio system for vehicular application
An audio processing module (20) capable of virtually infinite segmentation of the audio frequency spectrum. The module (20) comprises a first submodule (22), a second submodule (24) and a subwoofer...
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5004067 |
Cinema sound system for unperforated screens
A cinema sound system for unperforated screens includes for each stereophonic channel a floor positioned direct radiator bass speaker unit radiating into quarter space and an upper frequency...
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4991221 |
Active speaker system and components therefor
A biamplified speaker system wherein each speaker enclosure contains amplifiers and an electronic crossover network is powered by its own power supply. A preamplified audio signal is fed to each...
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4905284 |
Audio system for vehicular applications
Electronic crossover modules and systems in accordance with the invention employ a set of crossover channels in each module together with internal input interconnections which enable input signals...
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4856065 |
Power fader for a loudspeaker system
In an adjustable power fader device for a loudspeaker system with at least four speakers right and left channel input signals are received by respective power fader circuits. Each power fader...
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4771466 |
Multidriver loudspeaker apparatus with improved crossover filter circuits
A loudspeaker system includes at least two loudspeaker drivers, together with an electrical crossover network having filter circuits with at least two separate mutually exclusive frequency...
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4633501 |
Program dependent crossover filter (PDC)
An audio crossover filter which automatically tunes the crossover frequency according to the content of the program audio which is being filtered.
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4589135 |
Zero phase shift filtering
A frequency band filtering circuit and phase shift free crossover network comprising at each crossover frequency range between band pass filters a low-pass filter means characterized by a transfer...
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4583245 |
Speaker system protection circuit
A circuit and method for protecting speakers and speaker systems from damage due to overload conditions. A crossover circuit splits a broad band input signal into output signals of selected...
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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 out-of-phase...
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4525857 |
Crossover network
A peak limiter is described which employs the Hilbert transform. Effectively distinct processing occurs for low frequency and high frequency signals and harmonic distortion results only when the...
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4426552 |
Speaker distortion compensator
In sound generating systems, it has been ascertained that various factors cause spurious, audible emanations when transducers of reasonable size and cost are driven in complex motions...
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4412100 |
Multiband signal processor
A multiband analog audio processor is described which provides low peak-to-r.m.s. ratios. A distributed crossover configuration is described which, in the presently preferred embodiment, employs...
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4329902 |
Electronic method and apparatus for modifying musical sound
A continuously varying electrical signal representing an original musical sound is divided at a selected mid-frequency of about 800 Hertz to provide upper and lower frequency signal bands which are...
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4137510 |
Frequency band dividing filter
A frequency band dividing filter comprises at least two unit circuits connected in cascade connection of at least two stages, and at least one supplemental delay circuit. Each of the unit circuits...
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4100371 |
Loudspeaker system with phase difference compensation
A loudspeaker system in which two loudspeakers that cover different but overlapping frequency ranges, for example a treble range and a bass range, are mounted to radiate from co-planar mouths....
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3862366 |
SOUND RADIATION SYSTEM
A sound radiator comprising at least four high frequency loudspeakers with their axes intersecting in zigzag relationship, and a single low frequency loudspeaker whose center is at a distance not...
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3613022 |
BRANCHING CIRCUIT FOR COMPOSITE ELECTRICAL SIGNALS
Branching networks comprise two filters having complementary characteristics e.g. a LP and a HP network. Only one filter network is used in the proposed arrangement. The complementary network is...
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3060264 |
Amplifier
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2924662 |
Broadcasting receiver
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2846503 |
Output stages for low-frequency amplifiers comprising two loudspeakers
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