JPS5588412A - Expansion circuit - Google Patents
Expansion circuitInfo
- Publication number
- JPS5588412A JPS5588412A JP16247278A JP16247278A JPS5588412A JP S5588412 A JPS5588412 A JP S5588412A JP 16247278 A JP16247278 A JP 16247278A JP 16247278 A JP16247278 A JP 16247278A JP S5588412 A JPS5588412 A JP S5588412A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- potential
- expansion circuit
- capacitor
- turned
- 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
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
PURPOSE: To reduce the ripple for the expansion circuit using the multiplication circuit by delaying the discharge of the capacitor in the rectifier/smoothing circuit of the input signal.
CONSTITUTION: With decrement of input signal (a), the charging ends for capacitor C1. However, the potential can be kept constant at point (d) since transistor TR1 is off. Subtraction circuit 4 uses the difference voltage between points (d) and (e) as output (b), and thus the potential increases gradually at point (c). When this potential exceeds the reference voltage of comparator 5, TR1 is turned on via comparator 5 to charge C1. And if the minimum frequency supplied to the expansion circuit is set to fmin and thus time T during which TR1 is turned on is set more than double the minimum frequency, the DC ripple component supplied to multiplication circuit 1 can be eliminated practically.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16247278A JPS5588412A (en) | 1978-12-26 | 1978-12-26 | Expansion circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16247278A JPS5588412A (en) | 1978-12-26 | 1978-12-26 | Expansion circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5588412A true JPS5588412A (en) | 1980-07-04 |
Family
ID=15755267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16247278A Pending JPS5588412A (en) | 1978-12-26 | 1978-12-26 | Expansion circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5588412A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5756023U (en) * | 1980-09-18 | 1982-04-01 |
-
1978
- 1978-12-26 JP JP16247278A patent/JPS5588412A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5756023U (en) * | 1980-09-18 | 1982-04-01 |
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