JPS6489807A - Sound volume controller - Google Patents
Sound volume controllerInfo
- Publication number
- JPS6489807A JPS6489807A JP24646287A JP24646287A JPS6489807A JP S6489807 A JPS6489807 A JP S6489807A JP 24646287 A JP24646287 A JP 24646287A JP 24646287 A JP24646287 A JP 24646287A JP S6489807 A JPS6489807 A JP S6489807A
- Authority
- JP
- Japan
- Prior art keywords
- sound volume
- output
- sawtooth wave
- volume control
- pwm converter
- 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
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To improve the sound volume change characteristic at a low sound volume by using an output pulse of a PWM converter so as to initialize the output of a sawtooth wave generating circuit to a zero value, smoothing the output of the sawtooth wave generating circuit so as to use it as a sound volume control voltage. CONSTITUTION:A PWM converter 1 generates a PWM signal being a pulse signal proportional to a sound volume control data. The sawtooth wave generating circuit 2 initializes the output to zero by using an output pulse of the PWM converter 1 and its output is a sawtooth wave signal synchronously with the output pulse of the PWM converter 1. A smoothing circuit 3 smooths the sawtooth wave signal to convert it into a sound control DC voltage. Thus, the sound volume control characteristic at a low sound volume is controlled optionally by using a sound volume control data and the sound volume control characteristic at low sound volume is improved by a simple circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24646287A JPS6489807A (en) | 1987-09-30 | 1987-09-30 | Sound volume controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24646287A JPS6489807A (en) | 1987-09-30 | 1987-09-30 | Sound volume controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6489807A true JPS6489807A (en) | 1989-04-05 |
Family
ID=17148784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24646287A Pending JPS6489807A (en) | 1987-09-30 | 1987-09-30 | Sound volume controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6489807A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010056638A (en) * | 2008-08-26 | 2010-03-11 | Asahi Kasei Electronics Co Ltd | Variable gain amplifying circuit |
-
1987
- 1987-09-30 JP JP24646287A patent/JPS6489807A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010056638A (en) * | 2008-08-26 | 2010-03-11 | Asahi Kasei Electronics Co Ltd | Variable gain amplifying circuit |
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