JPS5474349A - Compressor-expander circuit - Google Patents
Compressor-expander circuitInfo
- 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
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
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) |
-
1977
- 1977-11-25 JP JP14132977A patent/JPS5474349A/en active Pending
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