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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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7409067 |
Method and apparatus for adjusting frequency characteristic of signal
In a frequency characteristic adjustment apparatus incorporated in an audio system, a frequency characteristic of an audio signal is made to agree with a target frequency characteristic, thus...
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7388959 |
Harmonic generator and pre-amp
A Harmonic Generator for audio applications and a Pre-Amplifier circuit are combined to form a Harmonic Generator and Pre-Amplifier circuit. The Harmonic Generator is formed from a Buffer Circuit...
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7266205 |
Linearized filter band equipment and processes
A method for use with equipment having filters, the method characterized by multiplying a matrix having a specified cut-boost setting of a filter of a graphic equalizer by a correction matrix to...
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6791433 |
Signal processing by means of resonators
Scheme for processing an input signal A(t) by N resonators ( 17 ), each having parameters characterizing it, to generate N individual output signals. Then each of the N individual output signals is...
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6751323 |
Electroacoustic apparatus having ringing signal generation means capable of producing a subjective bass perception
An electroacoustic transducer ( 1 ) includes a ringing signal generation means ( 20 ) for generating a ringing signal (CS) and an electroacoustic transducer ( 9 ) for the acoustic reproduction of...
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6587566 |
Sound field forming circuit and sound field forming apparatus
A sound field forming circuit includes a first switch portion which switchingly supplies one of an audio signals from a sound source and a second tone control circuit which variably adjusts a...
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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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6317117 |
User interface for the control of an audio spectrum filter processor
A user interface control apparatus is disclosed for the control of electronic filter parameters of audio spectrum equalizers, crossovers, and other filter processors. The user interface apparatus...
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RE37223 |
Dynamic equalizing
An automatic dynamic equalization circuit has a potentiometer having a tap shunted by an active resonator circuit including a capacitor shunted by an active circuit presenting a high Q inductive...
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6101257 |
Audio signal processor
An audio signal processor is disclosed which has at least one audio signal input and at least one audio signal output as well as at least one control input, and an audio signal processing unit...
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6088460 |
Equalizer and audio device using the same
An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage...
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5987065 |
Adaptive equalizer
An equalizer comprising a pair of high pass filters for receiving an input signal, each filter having gain, a first of the filters having gain which is substantially flat within its passband, a...
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5982907 |
Audio signal waveform emphasis processing device and method
An audio signal waveform emphasis processing device performs even-order integration on an input audio signal using one or a plurality of double integrators and even-order differentiation on the...
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5974156 |
Circuit arrangement for influencing the frequency response of a digital audio signal
A digital circuit arrangement for influencing the frequency response of a digital audio signal as a function of frequency and/or amplitude, in which the input signal of the digital circuit...
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5949821 |
Method and apparatus for correcting phase and gain imbalance between in-phase (I) and quadrature (Q) components of a received signal based on a determination of peak amplitudes
A communication device (100) includes an equalizer (126) for correcting imbalance between in-phase and quadrature components of a received signal. The equalizer (126) determines peak amplitude for...
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5727074 |
Method and apparatus for digital filtering of audio signals
The present invention provides an efficient audio equalization system in terms of the number of coefficients and taps of a digital filter. The processing efficiency of the system allows it to...
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5714918 |
Equalizer for digitized signals
In an equalizer with n number of frequency ranges for digitized signals in which by means of n-1 cascaded filter circuits containing parallel connected digital low-pass filters and digital high...
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5692051 |
Electronic equalization for recessed loudspeaker mounting
An equalizing circuit, for compensating frequency response perturbations in a loudspeaker caused by a recessed mounting of the loudspeaker, includes an input for receiving an audio signal, a...
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5539833 |
Audio signal amplifier device
An audio signal amplifier device is disclosed, and includes two parallel compass controller circuits (6, 7), each of the circuits (6, 7) having the identical configuration and including a low...
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5530769 |
Equalizer and audio device using the same
An equalizer includes: a first attenuating circuit which receives an input signal and a first control signal and attenuates the input signal depending on the level of the first control signal; a...
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5524290 |
Adaptive graphic equalizer and radio using same
An adaptive graphic equalizer (200, 400) has various ordinarily fixed parameters (such as center frequencies, filter bandwidths, and step response sensitivity) that are automatically altered to...
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5509080 |
Bass clipping circuit
A clipping circuit is coupled across the bass feedback shunt capacitor in an amplifier circuit to effectively reduce only high level bass signals while allowing level high frequencies to pass and...
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5459791 |
Audio frequency filter
An audio frequency filter for a mixing console equalizer typically has a manual frequency control for setting its operating frequency range, and a manual gain control for controlling the gain of...
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5327102 |
Sound recording apparatus
A sound recording apparatus for equalizing a sound signal before the sound signal is recorded onto a recording medium includes an amplifier to which the sound signal is inputted and a simulated...
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5305388 |
Bass compensation circuit for use in sound reproduction device
A bass compensation circuit for use in a sound reproduction device is provided with a second-order positive feedback type high-pass filter. The filter has an operational amplifier and a first...
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5282252 |
Audio equalizer providing reciprocal equalization plus infinite-depth notch
Audio equalizer circuit for adjusting the amount of boost and cut. The circuit uses a combination negative feedback, positive feedback, negative feed-forward and positive feed-forward resulting in...
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5210806 |
Digital audio signal processing apparatus
Disclosed herein is a digital audio signal processing apparatus of a type wherein a graphic equalizer including a plurality of filters connected in series to one another is subjected to arithmetic...
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5201009 |
Signal processor
An operational amplifier (1) and resistors (11) and (12) damp an input signal (V 1 ) by -6dB. Since a positive input terminal of the operational amplifier (1) is fixed at -3V, DC component of the...
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5091956 |
Adaptive high pass filter having cut-off frequency controllable responsive to input signal and operating method therefor
An adaptive high pass filter comprises a switched capacitor filter (11) operable as a high pass filter, detecting circuits (14, 15, 16) for detecting low frequency signal components included in an...
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5050217 |
Dynamic noise reduction and spectral restoration system
An audio processor consisting of a "single-ended" dynamic noise reduction system cascaded and cross-coupled with a program-adaptive dynamic equalizer. The audio at the output has a consistent...
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5046105 |
Audio signal equalizer having accelerated slope phase shift compensated filters
A tone control shelving equalizer providing low shelf (bass) boost and cut, and high shelf (treble) boost and cut is disclosed wherein the active filter stages provide sharpened (accelerated)...
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4994770 |
Tone control device
An improved tone control device for controlling a tone within an audio frequency range in a combined mode of fine compensation for frequency characteristic as in the graphic equalizer and coarse...
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4972489 |
Sound reproducing apparatus
A sound reproduction system suitable for automobile, the reproduction system having a band-pass filter, a phase-shifter for shifting the output of the band-pass filter and a mixer which mixes the...
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4955058 |
Apparatus and method for equalizing a soundfield
Apparatus for equalizing a soundfield comprises an amplifier and a gain control circuit for selectively adjusting the gain of the amplifier as a function of frequency in response to data values...
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4939782 |
Self-compensating equalizer
A multi-band graphic equalizer is provided that includes a plurality of controllable frequency response determining elements, each element having a primary effect in its primary frequency band and...
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4891841 |
Reciprocal, subtractive, audio spectrum equalizer
An equalizer circuit is disclosed having adjustable bandpass filters connected with operational amplifiers in feedforward and feedback paths so as to form frequency selective boost and cut signal...
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4888808 |
Digital equalizer apparatus enabling separate phase and amplitude characteristic modification
A digital equalizer for audio system applications is based on a FIR (finite impulse response) digital filter whose amplitude and phase/frequency characteristics can be respectively independently...
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4845758 |
Equalizer with adjustable band filters and a digital filter suitable for use in the equalizer
A manually operated or automatic equalizer (1) with adjustable band filters for varying the frequency characteristic of an electric signal presented to an input (2) and for applying a frequency...
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4809337 |
Audio noise gate
An audio noise gate having a main audio circuit having a filter with a control terminal for determining frequency response and having at least two different roll-off frequencies including one that...
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4797933 |
Bass amplifier with high frequency response
A method of improving the frequency reproduction at frequencies higher than a certain break frequency (fs) of a bass amplifier known per se within the audio frequency range. The amplifier has a...
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4759065 |
Automotive sound system
A sound system comprises four channels, each having a low level input for coupling to a source of program material, multiple, independently selectable gyrators providing equalization poles, and an...
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4739514 |
Automatic dynamic equalizing
An automatic dynamic equalizer includes left and right input terminals, an input adder and left and right output adders. The left and right input terminals are connected to inputs of the input...
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4633189 |
NF tone control circuit
An NF (Negative Feedback) tone control circuit in which a circuit gain of unity is maintained for a flat frequency response without the addition of active components. A voltage divider circuit...
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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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4566119 |
Equalizer networks and methods of developing scaling coefficients therefor
An adjustable equalizer network comprises a series chain of N all pass amplifier stages driving M minimum phase shift transversal filters connected to a final summing circuit that includes means to...
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4538298 |
Fixed bandpass tone controlling
A tone control has a transfer function characterized by a zero and pole on the real axis spaced from the imaginary axis by an audible frequency with adjustment of a potentiometer causing one of the...
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4523156 |
Anti-distortion anti-transient tone control circuit
A tone control circuit including an amplifier having a continuously adjustable frequency response control for varying the effect of low and high frequency filters upon the amplifier, and...
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4521818 |
One plus double omega squared radio frequency equalizer
A circuit for selectively combining an input signal with a selected fraction of the input signal, twice differentiated, is comprised of two amplifier circuits, each having two input stages and a...
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4501015 |
Apparatus for electroacoustic energy conversion
The present invention relates to apparatus for electroacoustic energy conversion and particularly to a conversion apparatus comprising a channel for an electrical signal to be converted, said...
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