JPS6466697A - Musical sound generation circuit - Google Patents
Musical sound generation circuitInfo
- Publication number
- JPS6466697A JPS6466697A JP62224423A JP22442387A JPS6466697A JP S6466697 A JPS6466697 A JP S6466697A JP 62224423 A JP62224423 A JP 62224423A JP 22442387 A JP22442387 A JP 22442387A JP S6466697 A JPS6466697 A JP S6466697A
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- output
- rudder
- input
- 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
- Electrophonic Musical Instruments (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE: To output a plurality of sounds with one operational amplifier and to facilitate an integrated circuit structure without any special mixing circuit by constructing a waveform generating D/A converter with a plurality of rudder resistor sets and one operational amplifier. CONSTITUTION: Data of respective amplitude value memory are respectively transmitted to amplitude D/A converters 1 and 3, and the maximum value of an amplitude voltage of the waveform is inputted into a reference voltage of a current-voltage conversion type waveform generating D/A converters 2 and 4 by a R-2R rudder resistor. The output of these two rudder resistors are connected at the input terminal of the ope-amplifier 5 to perform current mixing. That is, a point A where the output of two rudders resistances are connected is inputted into a minus input of the operational amplifier 5, when a feedback is performed with the resistance of KR, the potential of the point A is made to equal to the potential of plus input of the operational amplifier 5. Therefore, currents flowing from respective waveform rudder are superposed as a minus terminal input current of the operational amplifier 5, and made to appear at the output terminal of the ope-amplifier 5 as an output voltage mixed respective waveforms.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62224423A JP2668219B2 (en) | 1987-09-08 | 1987-09-08 | Analog waveform generator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62224423A JP2668219B2 (en) | 1987-09-08 | 1987-09-08 | Analog waveform generator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6466697A true JPS6466697A (en) | 1989-03-13 |
JP2668219B2 JP2668219B2 (en) | 1997-10-27 |
Family
ID=16813548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62224423A Expired - Lifetime JP2668219B2 (en) | 1987-09-08 | 1987-09-08 | Analog waveform generator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2668219B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04166999A (en) * | 1990-10-31 | 1992-06-12 | Seikosha Co Ltd | Acoustic signal synthesizing circuit |
US6598099B2 (en) | 1994-01-21 | 2003-07-22 | Hitachi, Ltd. | Data transfer control method, and peripheral circuit, data processor and data processing system for the method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5871722A (en) * | 1981-10-26 | 1983-04-28 | Yokogawa Hewlett Packard Ltd | Digital-analog converter |
JPS58169194A (en) * | 1982-03-31 | 1983-10-05 | 日本ビクター株式会社 | Electronic musical instrument |
-
1987
- 1987-09-08 JP JP62224423A patent/JP2668219B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5871722A (en) * | 1981-10-26 | 1983-04-28 | Yokogawa Hewlett Packard Ltd | Digital-analog converter |
JPS58169194A (en) * | 1982-03-31 | 1983-10-05 | 日本ビクター株式会社 | Electronic musical instrument |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04166999A (en) * | 1990-10-31 | 1992-06-12 | Seikosha Co Ltd | Acoustic signal synthesizing circuit |
US6598099B2 (en) | 1994-01-21 | 2003-07-22 | Hitachi, Ltd. | Data transfer control method, and peripheral circuit, data processor and data processing system for the method |
US6643720B2 (en) | 1994-01-21 | 2003-11-04 | Hitachi, Ltd. | Data transfer control method, and peripheral circuit, data processor and data processing system for the method |
US7203809B2 (en) | 1994-01-21 | 2007-04-10 | Renesas Technology Corp. | Data transfer control method, and peripheral circuit, data processor and processing system for the method |
Also Published As
Publication number | Publication date |
---|---|
JP2668219B2 (en) | 1997-10-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080704 Year of fee payment: 11 |