GB2000945A - Improvements relating to signal compressors and expanders - Google Patents

Improvements relating to signal compressors and expanders

Info

Publication number
GB2000945A
GB2000945A GB7829398A GB7829398A GB2000945A GB 2000945 A GB2000945 A GB 2000945A GB 7829398 A GB7829398 A GB 7829398A GB 7829398 A GB7829398 A GB 7829398A GB 2000945 A GB2000945 A GB 2000945A
Authority
GB
United Kingdom
Prior art keywords
control signal
control
expanders
derived
variable gain
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Withdrawn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
GB7829398A
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.)
Dolby Laboratories Licensing Corp
Original Assignee
Dolby Laboratories Licensing Corp
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 Dolby Laboratories Licensing Corp filed Critical Dolby Laboratories Licensing Corp
Publication of GB2000945A publication Critical patent/GB2000945A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

In syllabic compressors and expanders a control signal is required to control the gain of the device which effects compression or expansion. In this invention a first control signal following long term amplitude variations of the input signal is derived by means of an RMS detector 11. A second control signal following short term amplitude variations is derived by an adaptive smoothing circuit 13 of known form. The two control signals act in combination. They may be added together to provide a single control signal for a variable gain amplifier 23 or they may be applied to control respective, series-connected, variable gain amplifiers. The invention enables the advantage of an adaptive technique to be obtained without the need to set levels to get the correct results in a compressor - expander processing system. <IMAGE>
GB7829398A 1977-07-11 1978-07-11 Improvements relating to signal compressors and expanders Withdrawn GB2000945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81437177A 1977-07-11 1977-07-11

Publications (1)

Publication Number Publication Date
GB2000945A true GB2000945A (en) 1979-01-17

Family

ID=25214864

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7829398A Withdrawn GB2000945A (en) 1977-07-11 1978-07-11 Improvements relating to signal compressors and expanders

Country Status (1)

Country Link
GB (1) GB2000945A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041310A1 (en) * 1980-05-29 1981-12-09 Cbs Inc An electronic circuit for signal compression and expansion
WO2001026221A1 (en) * 1999-10-07 2001-04-12 K. S. Waves Ltd. Dynamic range compressor-limiter and low-level-expander with look-ahead for maximizing and stabilizing voice level in telecommunication applications
WO2007017304A1 (en) * 2005-08-08 2007-02-15 Jünger Audio-Studiotechnik GmbH Electronic appliance for triggering audio signals as well as corresponding computer programme and corresponding computer-readable storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041310A1 (en) * 1980-05-29 1981-12-09 Cbs Inc An electronic circuit for signal compression and expansion
WO2001026221A1 (en) * 1999-10-07 2001-04-12 K. S. Waves Ltd. Dynamic range compressor-limiter and low-level-expander with look-ahead for maximizing and stabilizing voice level in telecommunication applications
WO2007017304A1 (en) * 2005-08-08 2007-02-15 Jünger Audio-Studiotechnik GmbH Electronic appliance for triggering audio signals as well as corresponding computer programme and corresponding computer-readable storage medium

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)