JPH01137646U - - Google Patents

Info

Publication number
JPH01137646U
JPH01137646U JP3432888U JP3432888U JPH01137646U JP H01137646 U JPH01137646 U JP H01137646U JP 3432888 U JP3432888 U JP 3432888U JP 3432888 U JP3432888 U JP 3432888U JP H01137646 U JPH01137646 U JP H01137646U
Authority
JP
Japan
Prior art keywords
detection
frequency
dtmf signal
specific frequency
circuit
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
JP3432888U
Other languages
English (en)
Japanese (ja)
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 filed Critical
Priority to JP3432888U priority Critical patent/JPH01137646U/ja
Publication of JPH01137646U publication Critical patent/JPH01137646U/ja
Pending legal-status Critical Current

Links

JP3432888U 1988-03-14 1988-03-14 Pending JPH01137646U (US06229276-20010508-P00022.png)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3432888U JPH01137646U (US06229276-20010508-P00022.png) 1988-03-14 1988-03-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3432888U JPH01137646U (US06229276-20010508-P00022.png) 1988-03-14 1988-03-14

Publications (1)

Publication Number Publication Date
JPH01137646U true JPH01137646U (US06229276-20010508-P00022.png) 1989-09-20

Family

ID=31261041

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3432888U Pending JPH01137646U (US06229276-20010508-P00022.png) 1988-03-14 1988-03-14

Country Status (1)

Country Link
JP (1) JPH01137646U (US06229276-20010508-P00022.png)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5550765A (en) * 1978-10-06 1980-04-12 Nippon Telegr & Teleph Corp <Ntt> Digital signal receiver
JPS56131245A (en) * 1980-03-19 1981-10-14 Hitachi Ltd Signal detecting circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5550765A (en) * 1978-10-06 1980-04-12 Nippon Telegr & Teleph Corp <Ntt> Digital signal receiver
JPS56131245A (en) * 1980-03-19 1981-10-14 Hitachi Ltd Signal detecting circuit

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