JPS54145411A - Frequency detection system - Google Patents

Frequency detection system

Info

Publication number
JPS54145411A
JPS54145411A JP5371778A JP5371778A JPS54145411A JP S54145411 A JPS54145411 A JP S54145411A JP 5371778 A JP5371778 A JP 5371778A JP 5371778 A JP5371778 A JP 5371778A JP S54145411 A JPS54145411 A JP S54145411A
Authority
JP
Japan
Prior art keywords
frequency
bpfs
decoder
response characteristics
temperature
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
JP5371778A
Other languages
Japanese (ja)
Inventor
Fusakichi Okochi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP5371778A priority Critical patent/JPS54145411A/en
Publication of JPS54145411A publication Critical patent/JPS54145411A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Facsimile Transmission Control (AREA)

Abstract

PURPOSE: To enable a system to operate stably even in case of variation in temperature and also to adjust a frequency with rapid response characteristics, by selecting an input signal, applied to a few BPFs different in frequency band, corresponding to a signal applied to a decoder.
CONSTITUTION: Several BPFs 1, having different frequency bands, are applied in common with a received input and their outputs are led to common amplifier 4 via individual switches 2 and then sent to retriggerable monostable multivibrator 6 via waveform shaping unit 5. Here, decoder 3 selects one of output terminals 0 to 7 corresponding to signals applied to input terminals A0 to A2 and E and closes the switch connecting to the selected switch. Consequently, the operation is stabilized against variation in temperature, and a frequency adjustment can be simplified with response characteristics quickened.
COPYRIGHT: (C)1979,JPO&Japio
JP5371778A 1978-05-08 1978-05-08 Frequency detection system Pending JPS54145411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5371778A JPS54145411A (en) 1978-05-08 1978-05-08 Frequency detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5371778A JPS54145411A (en) 1978-05-08 1978-05-08 Frequency detection system

Publications (1)

Publication Number Publication Date
JPS54145411A true JPS54145411A (en) 1979-11-13

Family

ID=12950573

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5371778A Pending JPS54145411A (en) 1978-05-08 1978-05-08 Frequency detection system

Country Status (1)

Country Link
JP (1) JPS54145411A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5175308A (en) * 1974-12-26 1976-06-29 Anritsu Electric Co Ltd Tashuhajushinkino jibunkatsushutsuryokukairohoshiki

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5175308A (en) * 1974-12-26 1976-06-29 Anritsu Electric Co Ltd Tashuhajushinkino jibunkatsushutsuryokukairohoshiki

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