JPS6410715A - Automatic loudness control circuit - Google Patents
Automatic loudness control circuitInfo
- Publication number
- JPS6410715A JPS6410715A JP16471987A JP16471987A JPS6410715A JP S6410715 A JPS6410715 A JP S6410715A JP 16471987 A JP16471987 A JP 16471987A JP 16471987 A JP16471987 A JP 16471987A JP S6410715 A JPS6410715 A JP S6410715A
- Authority
- JP
- Japan
- Prior art keywords
- output signal
- amplifier
- signal
- components
- power amplifier
- 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
Links
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
PURPOSE:To reduce the number of components, and to reduce the dispersion of characteristic as well by providing a switch circuit which supplies one of the output signal of a signal line to let an input signal pass as it is or the output signal of an addition circuit to a power amplifier. CONSTITUTION:A buffer amplifier 11 forms the signal line to let the input signal pass as it is. When a manual switch 33 is turned OFF, the operation of buffer amplifier 11 is stopped, according to a control signal, generated from the switch circuit 32, and a summing amplifier 12, the buffer amplifier 24 and a detection circuit 30 turn into an operating state. The mixed output signal of an intermediate frequency band component, the level which is nearly equal to the output signal of a preamplifier 10, and a high and a low frequency band components, which were boosted, is obtained at the output terminal of the summing amplifier 12, and the mixed output signal is amplified by the power amplifier 25, and is impressed to a speaker 29, and in automatic loudness control corresponding to the output signal level of the power amplifier 25 is realized. Thus, the numbers of the externally attached components, the number of externally attached pins and the number of internal circuit elements can be reduced.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16471987A JPH0671183B2 (en) | 1987-07-01 | 1987-07-01 | Automatic loudness control circuit |
US07/180,483 US4982435A (en) | 1987-04-17 | 1988-04-12 | Automatic loudness control circuit |
EP88105872A EP0287057B1 (en) | 1987-04-17 | 1988-04-13 | Automatic loudness control circuit |
DE3850289T DE3850289T2 (en) | 1987-04-17 | 1988-04-13 | Automatic volume control circuit. |
CA000564288A CA1305432C (en) | 1987-04-17 | 1988-04-15 | Automatic loudness control circuit |
KR88004342A KR970004616B1 (en) | 1987-04-17 | 1988-04-16 | Automatic loudness control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16471987A JPH0671183B2 (en) | 1987-07-01 | 1987-07-01 | Automatic loudness control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6410715A true JPS6410715A (en) | 1989-01-13 |
JPH0671183B2 JPH0671183B2 (en) | 1994-09-07 |
Family
ID=15798591
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16471987A Expired - Lifetime JPH0671183B2 (en) | 1987-04-17 | 1987-07-01 | Automatic loudness control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0671183B2 (en) |
-
1987
- 1987-07-01 JP JP16471987A patent/JPH0671183B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0671183B2 (en) | 1994-09-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |