JPS5474349A - Compressor-expander circuit - Google Patents

Compressor-expander circuit

Info

Publication number
JPS5474349A
JPS5474349A JP14132977A JP14132977A JPS5474349A JP S5474349 A JPS5474349 A JP S5474349A JP 14132977 A JP14132977 A JP 14132977A JP 14132977 A JP14132977 A JP 14132977A JP S5474349 A JPS5474349 A JP S5474349A
Authority
JP
Japan
Prior art keywords
attenuators
precision
output
signal
comparator
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.)
Pending
Application number
JP14132977A
Other languages
Japanese (ja)
Inventor
Masaaki Kato
Keiji Takeuchi
Seishi Kageyama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14132977A priority Critical patent/JPS5474349A/en
Publication of JPS5474349A publication Critical patent/JPS5474349A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE: To improve precision by selecting a plural number of attenuators, by compressing a signal by an operational amplifier equipped with attenuators at its feedback loop, and by expanding the signal by separated attenuators.
CONSTITUTION: The output of sample holding circuit 11 is supplied to operational amplifier 12 and also to comparator 13. Comparator 13 has a plural number of reference levels and discriminates an input signal levels to output a control signal, thereby selecting attenuators 16a to 16c. The output of amplifier 12 is converted into PCM codes via A/D converter 14. Switches 15, 19 and 20 change over, interlocking together, to the T side at a compressing time and to the R side at an expanding time. Attenuators are therefore used in common, so that even when constituting parts of low precision are used, the precision of this circuit can be improved without improving the precision of each part.
COPYRIGHT: (C)1979,JPO&Japio
JP14132977A 1977-11-25 1977-11-25 Compressor-expander circuit Pending JPS5474349A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14132977A JPS5474349A (en) 1977-11-25 1977-11-25 Compressor-expander circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14132977A JPS5474349A (en) 1977-11-25 1977-11-25 Compressor-expander circuit

Publications (1)

Publication Number Publication Date
JPS5474349A true JPS5474349A (en) 1979-06-14

Family

ID=15289401

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14132977A Pending JPS5474349A (en) 1977-11-25 1977-11-25 Compressor-expander circuit

Country Status (1)

Country Link
JP (1) JPS5474349A (en)

Similar Documents

Publication Publication Date Title
JPS55100740A (en) Analog-to-digital converter
JPS5243308A (en) Signal transmitting system
JPS52147729A (en) Frequency converter
JPS5429919A (en) Video signal processing circuit
JPS5493954A (en) Interpolating pcm decoder
JPS54964A (en) Analog digital converter
JPS5474349A (en) Compressor-expander circuit
JPS5429959A (en) A-d converter
JPS5420647A (en) Integral analog-to-digital converter
JPS5327011A (en) Instantaneous c ompressing circuit
JPS537160A (en) Amplifier
JPS5410648A (en) Operation monitor circuit for amplifier
JPS5412208A (en) Gain-stabilized transmitter
JPS53120359A (en) Digital-to-analog converter circuit
JPS56117413A (en) Digital agc system
JPS57113404A (en) Signal secrecy maintaining device
JPS5389646A (en) Automatic gain control circuit
JPS53107650A (en) Switching regulator having two power source output
JPS52155576A (en) Input control circuit
JPS5417610A (en) Compressor-expander circuit for signal
JPS5341683A (en) Sampling control system
JPS5363843A (en) Range switching system of integrator
JPS5422078A (en) Command circuit
JPS5315051A (en) Chattering absorbing circuit of contacts
JPS5689125A (en) Binary circuit