JPS5625876A - Audio multiplex adaptor with automatic input level adjustment unit - Google Patents
Audio multiplex adaptor with automatic input level adjustment unitInfo
- Publication number
- JPS5625876A JPS5625876A JP10071579A JP10071579A JPS5625876A JP S5625876 A JPS5625876 A JP S5625876A JP 10071579 A JP10071579 A JP 10071579A JP 10071579 A JP10071579 A JP 10071579A JP S5625876 A JPS5625876 A JP S5625876A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- level
- control signal
- input
- 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
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/607—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for more than one sound signal, e.g. stereo, multilanguages
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
PURPOSE:To automatically adjust the input level to the optimum signal level preset, by comparing the level of control signal with the reference voltage preset, and correcting the level change of input signal through the use of the signal obtained as the result as gain control signal. CONSTITUTION:The audio multiplex signal input to the input terminal 1 is amplified at the variable gain amplifying circuit 2, and a part of the output of the circuit 2 is fed to the control signal detection circuit 12. The circuit 12 is provided with the control signal band pass filter circuit 4 and the detection circuit 5. Further, the reference voltage is set to the reference voltage circuit 7, this reference voltage and the detected voltage detected at the circuit 12 are compared at the voltage comparison circuit 6 and gain control signal is made with the compared result and fed to the switching circuit 9 via the LPF8. Further, the detection voltage from the circuit 12 is identified with the control signal identifying circuit 10 and the output of the constant voltage circuit 11 and that of LPF8 are switched with the identified signal to control the gain of the circuit 2. Further, independently of the input signal level change, the output signal level of the circuit 2 is automatically corrected to the design optimum level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10071579A JPS5625876A (en) | 1979-08-09 | 1979-08-09 | Audio multiplex adaptor with automatic input level adjustment unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10071579A JPS5625876A (en) | 1979-08-09 | 1979-08-09 | Audio multiplex adaptor with automatic input level adjustment unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5625876A true JPS5625876A (en) | 1981-03-12 |
Family
ID=14281346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10071579A Pending JPS5625876A (en) | 1979-08-09 | 1979-08-09 | Audio multiplex adaptor with automatic input level adjustment unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5625876A (en) |
-
1979
- 1979-08-09 JP JP10071579A patent/JPS5625876A/en active Pending
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