FR2450531A1 - High fidelity band equaliser - has amplifier with symmetrical gain of about zero using parallel filters between amplifier stages - Google Patents

High fidelity band equaliser - has amplifier with symmetrical gain of about zero using parallel filters between amplifier stages

Info

Publication number
FR2450531A1
FR2450531A1 FR7905503A FR7905503A FR2450531A1 FR 2450531 A1 FR2450531 A1 FR 2450531A1 FR 7905503 A FR7905503 A FR 7905503A FR 7905503 A FR7905503 A FR 7905503A FR 2450531 A1 FR2450531 A1 FR 2450531A1
Authority
FR
France
Prior art keywords
amplifier
gain
equaliser
zero
amplifier stages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR7905503A
Other languages
French (fr)
Inventor
Michel Bordas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson-Brandt SA filed Critical Thomson-Brandt SA
Priority to FR7905503A priority Critical patent/FR2450531A1/en
Publication of FR2450531A1 publication Critical patent/FR2450531A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/02—Manually-operated control
    • H03G5/025—Equalizers; Volume or gain control in limited frequency bands

Landscapes

  • Amplifiers (AREA)

Abstract

The connector or equaliser is for band filters in high fidelity systems, typically between preamplifier and power amplifier stages over a frequency range 20Hz to 20kHz. The equaliser has a high signal to noise ratio and low distortion and consists of two amplifier stages (Ae, As) interconnected by parallel band filters (F1-Fn). Each such filter has an associated potentiometer (P1-Pn) providing a direct input to the power stage and negative feedback to the input stage. The potentiometer determines the ratio of the output to feedback. The gain of the amplifiers is chosen such that with the potentiometers set at their centre values the input signal (e11) and the output signal (S2) levels are equal. The filter provides a symmetrical gain characteristic from positive to negative about zero gain.
FR7905503A 1979-03-02 1979-03-02 High fidelity band equaliser - has amplifier with symmetrical gain of about zero using parallel filters between amplifier stages Withdrawn FR2450531A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7905503A FR2450531A1 (en) 1979-03-02 1979-03-02 High fidelity band equaliser - has amplifier with symmetrical gain of about zero using parallel filters between amplifier stages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7905503A FR2450531A1 (en) 1979-03-02 1979-03-02 High fidelity band equaliser - has amplifier with symmetrical gain of about zero using parallel filters between amplifier stages

Publications (1)

Publication Number Publication Date
FR2450531A1 true FR2450531A1 (en) 1980-09-26

Family

ID=9222705

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7905503A Withdrawn FR2450531A1 (en) 1979-03-02 1979-03-02 High fidelity band equaliser - has amplifier with symmetrical gain of about zero using parallel filters between amplifier stages

Country Status (1)

Country Link
FR (1) FR2450531A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750044A (en) * 1972-05-22 1973-07-31 Intern Radio & Electronics Cor Graphic equalizer circuit
US3903485A (en) * 1968-01-10 1975-09-02 Ray Milton Dolby Compressors, expanders and noise reduction systems
US3921104A (en) * 1973-11-19 1975-11-18 Dolby Laboratories Inc Adjustable equalizers useable in audio spectrum
US4046960A (en) * 1975-12-31 1977-09-06 Veale John R Audio fidelity frequency equalizer system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903485A (en) * 1968-01-10 1975-09-02 Ray Milton Dolby Compressors, expanders and noise reduction systems
US3750044A (en) * 1972-05-22 1973-07-31 Intern Radio & Electronics Cor Graphic equalizer circuit
US3921104A (en) * 1973-11-19 1975-11-18 Dolby Laboratories Inc Adjustable equalizers useable in audio spectrum
US4046960A (en) * 1975-12-31 1977-09-06 Veale John R Audio fidelity frequency equalizer system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/76 *

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Legal Events

Date Code Title Description
ST Notification of lapse