JPS555589A - Audio amplifying circuit - Google Patents
Audio amplifying circuitInfo
- Publication number
- JPS555589A JPS555589A JP7962878A JP7962878A JPS555589A JP S555589 A JPS555589 A JP S555589A JP 7962878 A JP7962878 A JP 7962878A JP 7962878 A JP7962878 A JP 7962878A JP S555589 A JPS555589 A JP S555589A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- performance
- frequency
- input signal
- discrimination circuit
- 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
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
PURPOSE:To produce the audio with fidelity, by controlling the frequency performance of amplifier depending on S/N of the input signal. CONSTITUTION:While the S/N of input signal exceeds a given threshold value, the S/N discrimination circuit 4 outputs the signal of logic ''0'', the performance of the frequency performance control circuit 3 is flat, and the signal at the input terminal 1 is outputted at the output terminal 5 with amplification with fidelity. If the S/N is lowered below the said threshold value, the S/N discrimination circuit 4 outputs the signal of logic ''1'', the frequency performance control circuit 3 is changed for the connection to the performance emphasizing the higher frequency component to avoid the lowering in the clearness of the audio signal at the output terminal 5. As the S/N discrimination circuit 4, the amount of noise included in the frequency band other than that in 0.3 to 3 KHz among the input signal is detected and it is discriminated for the S/N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7962878A JPS555589A (en) | 1978-06-29 | 1978-06-29 | Audio amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7962878A JPS555589A (en) | 1978-06-29 | 1978-06-29 | Audio amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS555589A true JPS555589A (en) | 1980-01-16 |
Family
ID=13695333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7962878A Pending JPS555589A (en) | 1978-06-29 | 1978-06-29 | Audio amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS555589A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57194258A (en) * | 1981-05-09 | 1982-11-29 | Hooker Chemicals Plastics Corp | Treatment of metal phosphate coat |
-
1978
- 1978-06-29 JP JP7962878A patent/JPS555589A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57194258A (en) * | 1981-05-09 | 1982-11-29 | Hooker Chemicals Plastics Corp | Treatment of metal phosphate coat |
| JPS6056429B2 (en) * | 1981-05-09 | 1985-12-10 | メタルゲゼルシャフト アクチェンゲゼルシャフト | Phosphate film treatment method for metals |
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