Title:
WAVEFORM CONVERTING CIRCUIT
Document Type and Number:
Japanese Patent JP3162742
Kind Code:
B2
Abstract:
PURPOSE: To protect leak of source sound by sampling input analog signals in synchronous with a predetermined clock signal, and by giving the sampling result to the first switch to enhance the frequency conversion precision from source sound.
CONSTITUTION: When the first switch 20 and the second switch 21 are under control for the same phase, operating amplifier 23 acts as a reverse integrator. On the other hand, when switches 20 and 21 are under control for reverse phase, the operating amplifier 23 acts as a reverse integrator. Here, input analog signal VI is always sampled in the same timing in synchronous with CK, and the sampling signal VI' is given to the first switch 20. Accordingly, the amplitude of VO can be set by the value of VI at the rise of CK, the accurate waveform of VO along the envelope of VI can be obtained. As a result, leak of speech frequency can be reduced and source sound leak can also be suppressed.
Inventors:
Noboru Inami
Yuji Segawa
Yuji Segawa
Application Number:
JP20179591A
Publication Date:
May 08, 2001
Filing Date:
August 12, 1991
Export Citation:
Assignee:
富士通株式会社
富士通デバイス株式会社
富士通デバイス株式会社
International Classes:
H03C1/00; H03H19/00; H04K1/04; H04L9/06; H04L9/14; H04M1/00; H04M1/68; (IPC1-7): H04K1/04
Domestic Patent References:
| JP587903A | ||||
| JP4129405A |
Attorney, Agent or Firm:
Gunichiro Ariga
Gunichiro Ariga (1 person outside)
Gunichiro Ariga (1 person outside)
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