JPS6466697A - Musical sound generation circuit - Google Patents

Musical sound generation circuit

Info

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
Application number
JP62224423A
Other languages
Japanese (ja)
Other versions
JP2668219B2 (en
Inventor
Yuichi Matsuzaki
Yasushige Furuya
Yoshiyuki Terajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Hudson Soft Co Ltd
Original Assignee
Seiko Epson Corp
Hudson Soft Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp, Hudson Soft Co Ltd filed Critical Seiko Epson Corp
Priority to JP62224423A priority Critical patent/JP2668219B2/en
Publication of JPS6466697A publication Critical patent/JPS6466697A/en
Application granted granted Critical
Publication of JP2668219B2 publication Critical patent/JP2668219B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
JP62224423A 1987-09-08 1987-09-08 Analog waveform generator Expired - Lifetime JP2668219B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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