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Three-channel state-variable compressor circuit

A state-variable and compressor technology, applied in static memory, instruments, electrical components, etc., can solve problems such as information loss

Inactive Publication Date: 2006-06-28
BBE SOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sounds that are significantly louder than the average level of the music score can be compensated by automatic gain control or attenuation; however, if the attenuation provided by automatic gain control is broadband across the audio spectrum, information that does not need to be suppressed is also accompanied by high-amplitude Disturbances are lost together

Method used

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  • Three-channel state-variable compressor circuit
  • Three-channel state-variable compressor circuit
  • Three-channel state-variable compressor circuit

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Embodiment Construction

[0014] FIG. 1 shows a block diagram of a three-channel state-variable compressor circuit 10 . Dashed box 12 represents an all-pass (or three-channel) state-variable filter having an input coupled to receive and process an IPS (input program signal) arriving at input terminal 16 via signal line 14 . The IPS signal is typically a low level primary source wideband audio signal, such as from a stylus, read head, transducer, tape, disk or solid state recorder (such as an MP3 player, etc.) of a disc changer.

[0015] The state variable filter processes the IPS into three frequency ranges of the input program signal output at terminals 18,20,22. Each output signal contains a bandwidth limited portion of the IPS having spectral information from the input IPS restricted within a predetermined frequency band or frequency range of the entire spectrum of the IPS. The three signals include HFRIPS (High Frequency Range Input Program Signal) at output terminal 18, MFRIPS (Mid Frequency Rang...

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Abstract

An all-pass state-variable filter processes the incoming program signal into low-band, mid-band, and high-band signals. The mid-band signal has an additional inversion stage relative to the low-band and high-band signals. Each of the first, second and third SDCs (Scaled Detector Circuits) has an input coupled to receive a corresponding frequency band signal and function to buffer, rectify and filter the corresponding frequency band signal so that A control voltage is formed at its output. First, second and third voltage controlled amplifiers (VCAs) receive corresponding frequency band signals. Each VCA has a control voltage input. Each VCA decreases its gain in response to an increase in the control voltage applied at its control voltage input from the SDC output.

Description

[0001] Cross References to Related Applications [0002] This application provides information concerning the subject matter of the following patent document: S / N 08 / 377,903, filed January 24, 1995, entitled "A LOW INPUT SIGNAL BANDWIDTH COMPRESSORAND AMPLIFIER CONTROL CIRCUIT)", which was published as U.S. Patent 5,510,752 on April 23, 1996; S / N 09 / 636,168, filed April 22, 1996, titled "Invention with State-Variable All-Pass State-Variable Filter "A LOW INPUT SIGNAL BANDWIDTH COMPRESSOR AND AMPLIFIER CONTROL CIRCUIT WITH STATATE VARIABLE ALL-PASS STATE VARIABLE FILTER," published Apr. 7, 1998 as U.S. Patent 5,736,897; Nov. 1999 S / N 09 / 444,541, filed on 22nd, titled "AN AUDIO BOOSTCIRCUIT"; Existing Provisional Application Serial No. 60 / 497,095, filed on March 22, entitled "HARMONIC GENERATOR AND PRE-AMP." All references cited herein have the same inventor and assignee. The entire contents of all above-mentioned applications are hereby incorporated by reference. technical f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G5/22H03G9/30
CPCH03G9/005H03G9/025G11C7/00H03G5/00
Inventor P·R·加冈
Owner BBE SOUND
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