JPS5455417A - Electronic instrument - Google Patents

Electronic instrument

Info

Publication number
JPS5455417A
JPS5455417A JP12266177A JP12266177A JPS5455417A JP S5455417 A JPS5455417 A JP S5455417A JP 12266177 A JP12266177 A JP 12266177A JP 12266177 A JP12266177 A JP 12266177A JP S5455417 A JPS5455417 A JP S5455417A
Authority
JP
Japan
Prior art keywords
potential
mixing circuit
scale signals
output
fluctuations
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
Application number
JP12266177A
Other languages
Japanese (ja)
Inventor
Masahiko Sumio
Tsuneo Hirose
Kazuhiro Murase
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12266177A priority Critical patent/JPS5455417A/en
Publication of JPS5455417A publication Critical patent/JPS5455417A/en
Pending legal-status Critical Current

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Landscapes

  • Electrophonic Musical Instruments (AREA)

Abstract

PURPOSE: To prevent the generation of noises at the output side of a mixing circuit, which is receptive of musical scale signals, due to the DC fluctuations by applying a DC potential as a bias to the mixing circuit.
CONSTITUTION: Forty eight circuit blocks 101 to 412 are arranged to correspond to the respective intersectios of a matrix 1 having a key switch 4. A ring counter 8 receives clocks fc to generate scanning pulses ϕ1 to ϕ4 so that the row of the matix 1 may be scanned through buffer amplifiers 9 to 12. The logical multiplication is taken between the scanning pulses (ϕ1) generated by the depression of a key switch and the output pulses of the counter 8 so that the key depression information is generated and stored at 7. Electronic analog switches 15 and 16 are turned on in response to the key depression information so that musical scale signals are impressed upon mixing circuit 21 and 22. Since the irreversible input of the circuits 21 and 22 is supplied with a DC potential VREF and is made equal of the mean DC potential of the scale signals at the input side of the switches 15 and 16, there appear no noise due to the DC fluctuations at the output of the same
COPYRIGHT: (C)1979,JPO&Japio
JP12266177A 1977-10-12 1977-10-12 Electronic instrument Pending JPS5455417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12266177A JPS5455417A (en) 1977-10-12 1977-10-12 Electronic instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12266177A JPS5455417A (en) 1977-10-12 1977-10-12 Electronic instrument

Publications (1)

Publication Number Publication Date
JPS5455417A true JPS5455417A (en) 1979-05-02

Family

ID=14841495

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12266177A Pending JPS5455417A (en) 1977-10-12 1977-10-12 Electronic instrument

Country Status (1)

Country Link
JP (1) JPS5455417A (en)

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