JPS5597740A - Acoustic unit - Google Patents
Acoustic unitInfo
- Publication number
- JPS5597740A JPS5597740A JP505979A JP505979A JPS5597740A JP S5597740 A JPS5597740 A JP S5597740A JP 505979 A JP505979 A JP 505979A JP 505979 A JP505979 A JP 505979A JP S5597740 A JPS5597740 A JP S5597740A
- Authority
- JP
- Japan
- Prior art keywords
- power
- circuit
- power circuit
- time constant
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To obtain an acoustic unit which never generates a noise after its power switch is turned OFF, even if a power circuit with a large time constant is used. CONSTITUTION:At a point closer to an AC power supply side than power circuit 4 large in time constant and between it and power switch 2, AC power is extracted and then rectified and smoothed by subordinate power circuit 14 with the time constant much smaller than that of power circuit 4. With power switch 2 OFF, a voltage rising rapidly can be obtained from subordinate power circuit 14 and a differential output of it is applied to the base of transistor Tr13. Then, one-shot multivibrator 11 is triggerd by the output of Tr13 to generate a muting pulse and Tr9A and Tr9B in muting circuit 7 are made to conduct, so that a noise generated when the power is turned OFF can be removed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP505979A JPS5597740A (en) | 1979-01-19 | 1979-01-19 | Acoustic unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP505979A JPS5597740A (en) | 1979-01-19 | 1979-01-19 | Acoustic unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5597740A true JPS5597740A (en) | 1980-07-25 |
Family
ID=11600817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP505979A Pending JPS5597740A (en) | 1979-01-19 | 1979-01-19 | Acoustic unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5597740A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5056805A (en) * | 1973-09-14 | 1975-05-17 |
-
1979
- 1979-01-19 JP JP505979A patent/JPS5597740A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5056805A (en) * | 1973-09-14 | 1975-05-17 |
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