JPS63169571A - Tone detector - Google Patents

Tone detector

Info

Publication number
JPS63169571A
JPS63169571A JP79887A JP79887A JPS63169571A JP S63169571 A JPS63169571 A JP S63169571A JP 79887 A JP79887 A JP 79887A JP 79887 A JP79887 A JP 79887A JP S63169571 A JPS63169571 A JP S63169571A
Authority
JP
Japan
Prior art keywords
signal
circuit
tone
level
cycles
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
JP79887A
Inventor
Naoki Mori
Original Assignee
Nec Corp
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 Nec Corp filed Critical Nec Corp
Priority to JP79887A priority Critical patent/JPS63169571A/en
Publication of JPS63169571A publication Critical patent/JPS63169571A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To detect a tone signal by a simple circuit even when the number of kinds of tone signals to be detected is large by reading a stored detection signal regarding a frequency out of an address corresponding to the counted value of a counting circuit.
CONSTITUTION: The tone signal of frequency (i) from an input terminal 1 is inputted and compared by a level decision device 3 with a reference level signal (c) from a reference level generator 4. When the signal (a) is larger than the signal (c), a reset signal (d) is reset and the counting circuit 7 becomes ready to count. At the same time, an (n)-cycle segmenting circuit 2 detects the period of (n) cycles of the signal and holds the signal (b) at H level only in (n) cycles. A reference clock generator 5 outputs a reference clock signal (e) and an AND gate 6 ANDs the signals (e) and (b), which is gated and counted as a count clock signal (f) by the circuit 7 to generate a counted value signal, so that the signal is supplied as an address input to a ROM 8. For the purpose, address data are set in addresses of a ROM 8 to detect plural tones of frequencies i1, i2....
COPYRIGHT: (C)1988,JPO&Japio
JP79887A 1987-01-06 1987-01-06 Tone detector Pending JPS63169571A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP79887A JPS63169571A (en) 1987-01-06 1987-01-06 Tone detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP79887A JPS63169571A (en) 1987-01-06 1987-01-06 Tone detector

Publications (1)

Publication Number Publication Date
JPS63169571A true JPS63169571A (en) 1988-07-13

Family

ID=11483700

Family Applications (1)

Application Number Title Priority Date Filing Date
JP79887A Pending JPS63169571A (en) 1987-01-06 1987-01-06 Tone detector

Country Status (1)

Country Link
JP (1) JPS63169571A (en)

Cited By (264)

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