JPS562748A - Reference level varying system of compander - Google Patents

Reference level varying system of compander

Info

Publication number
JPS562748A
JPS562748A JP7893479A JP7893479A JPS562748A JP S562748 A JPS562748 A JP S562748A JP 7893479 A JP7893479 A JP 7893479A JP 7893479 A JP7893479 A JP 7893479A JP S562748 A JPS562748 A JP S562748A
Authority
JP
Japan
Prior art keywords
deltarf
reference level
expander
compander
compressor
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.)
Granted
Application number
JP7893479A
Other languages
Japanese (ja)
Other versions
JPS5938775B2 (en
Inventor
Takeshi Hattori
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP7893479A priority Critical patent/JPS5938775B2/en
Publication of JPS562748A publication Critical patent/JPS562748A/en
Publication of JPS5938775B2 publication Critical patent/JPS5938775B2/en
Expired legal-status Critical Current

Links

Classifications

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

Landscapes

  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To make it possible to change easily a reference level, by adding an attenuator and an amplifier in the succeeding stage of the compressor and in the preceding stage of the expander respectively in respect to the compander of arbitrary compression ratio and expansion ratio. CONSTITUTION:When lowering from reference level Rf is denoted as DELTARf and DELTARf' and the compression ratio is denoted as n, attenuator 6 of attenuation quantity DELTARf(n-1)/n is added to the output side of compressor 1 of the expander. Meanwhile, an amplifier of amplification quantity DELTARf'(n-1)/n is added to the input side of expander 2. As a result, reference level Rf can be lowered by DELTARf and DELTARf' for compressor 1 and expander 2 respectively independently, so that the reference level can be changed easily.
JP7893479A 1979-06-22 1979-06-22 Compander reference level variable method Expired JPS5938775B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7893479A JPS5938775B2 (en) 1979-06-22 1979-06-22 Compander reference level variable method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7893479A JPS5938775B2 (en) 1979-06-22 1979-06-22 Compander reference level variable method

Publications (2)

Publication Number Publication Date
JPS562748A true JPS562748A (en) 1981-01-13
JPS5938775B2 JPS5938775B2 (en) 1984-09-19

Family

ID=13675690

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7893479A Expired JPS5938775B2 (en) 1979-06-22 1979-06-22 Compander reference level variable method

Country Status (1)

Country Link
JP (1) JPS5938775B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63167873U (en) * 1987-04-22 1988-11-01
JPH055887Y2 (en) * 1987-09-08 1993-02-16

Also Published As

Publication number Publication date
JPS5938775B2 (en) 1984-09-19

Similar Documents

Publication Publication Date Title
GB1404331A (en) Selectively switchable compressor/expanders
SE7905187L (en) SPELLING FORMER WITH LOGARITHMIC CHAIN
JPS5571400A (en) Monolithic power ic and acoustic unit
JPS562748A (en) Reference level varying system of compander
ES473760A1 (en) Circuit arrangement for the selective compression or expansion of the dynamic range of a signal
JPS53142153A (en) Multi-step amplifier circuit
JPS53101252A (en) Feedback-type amplifier circuit
ES8204255A1 (en) Circuit arrangement for modifying dynamic range
JPS53126844A (en) Output amplifier
JPS537159A (en) Transistor amplifier
JPS5437664A (en) Automatic gain adjusting circuit
JPS5528630A (en) Channel divider
JPS5552609A (en) Amplifier for microwave
JPS5635516A (en) Automatic control device for sound volume
JPS5561113A (en) Ultra-high frequency band negative feedback amplifier
JPS5745708A (en) Amplifying circuit
JPS5377126A (en) High frequency amplfying circuit
JPS5350959A (en) Automatic gain control device
JPS55120232A (en) Repeater
JPS5437665A (en) Automatic fain adjusting circuit
JPS57188162A (en) Signal receiver
JPS53105927A (en) Relay amplifying device
JPS5417610A (en) Compressor-expander circuit for signal
JPS53110353A (en) Amplifier
JPS5647112A (en) Am receiver