Title:
OPERATING TONE GENERATOR
Document Type and Number:
Japanese Patent JP3855388
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To allow the generator to generate an operating tone in response to an operated key or the like with a simple configuration.
SOLUTION: An operation section 7 gives an operation signal corresponding to an operated key or the like to a microcomputer 1. The microcomputer 1 based on the operation signal controls a frequency generating circuit 2 and a PWM waveform generating circuit 5. An LPF 6 generates an attenuation signal S3 from a PWM signal S2 and controls a gain of a variable amplifier VCA 3 based on the signal S3. The VCA 3 controls the amplitude of a signal S1 from the frequency generating circuit 2 in response to the attenuation signal. The operating tone is generated by supplying a signal S4 from the VCA 3 to a speaker 4 with a simple configuration.
Inventors:
Shunichi Hasegawa
Nishigaki Tetsuo
Masafumi Nakakubo
Masaaki Kojima
Nishigaki Tetsuo
Masafumi Nakakubo
Masaaki Kojima
Application Number:
JP23944397A
Publication Date:
December 06, 2006
Filing Date:
September 04, 1997
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04Q9/00; (IPC1-7): H04Q9/00; H04Q9/00
Attorney, Agent or Firm:
Masatomo Sugiura
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