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JPS642451A - Incoming tone generating circuit - Google Patents

Incoming tone generating circuit

Info

Publication number
JPS642451A
JPS642451A JP15642187A JP15642187A JPS642451A JP S642451 A JPS642451 A JP S642451A JP 15642187 A JP15642187 A JP 15642187A JP 15642187 A JP15642187 A JP 15642187A JP S642451 A JPS642451 A JP S642451A
Authority
JP
Japan
Prior art keywords
signal
time
incoming tone
frequency
call signal
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
JP15642187A
Other languages
Japanese (ja)
Other versions
JPH012451A (en
Inventor
Makoto Shimizu
Tsutomu Ikeda
Osamu Shinohara
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP62-156421A priority Critical patent/JPH012451A/en
Priority claimed from JP62-156421A external-priority patent/JPH012451A/en
Publication of JPS642451A publication Critical patent/JPS642451A/en
Publication of JPH012451A publication Critical patent/JPH012451A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To accurately identify the position of a telephone set which generates an incoming tone by varying the attribute of the incoming tone according to variation in time.
CONSTITUTION: A time monitoring circuit 7 monitors the time when a call signal detecting circuit 6 detects a call signal according to a frequency-divided signal from a frequency divider for a detection signal from the call signal detecting circuit 6 and a decoder 4 supplies a time variation decoding signal which varies with time to a programmable counter 5. Consequently, the signal of frequency indicated with the time variation decoding signal from the decoder 4 according to the elapsed time from the detection of the call signal by the call signal detecting circuit 6, i.e. an incoming tone signal varying in frequency with the elapsed time is generated. Thus, which telephone set there is an incoming signal to is accurately discriminated.
COPYRIGHT: (C)1989,JPO&Japio
JP62-156421A 1987-06-25 Ringtone generation circuit Pending JPH012451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62-156421A JPH012451A (en) 1987-06-25 Ringtone generation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62-156421A JPH012451A (en) 1987-06-25 Ringtone generation circuit

Publications (2)

Publication Number Publication Date
JPS642451A true JPS642451A (en) 1989-01-06
JPH012451A JPH012451A (en) 1989-01-06

Family

ID=

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6067865A (en) * 1997-07-10 2000-05-30 Palas Gmbh Partikel-Und Lasermebtechnik Method and device for determining particle size distribution in aerosol

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63311844A (en) * 1987-06-15 1988-12-20 Nec Corp Telephone set

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63311844A (en) * 1987-06-15 1988-12-20 Nec Corp Telephone set

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6067865A (en) * 1997-07-10 2000-05-30 Palas Gmbh Partikel-Und Lasermebtechnik Method and device for determining particle size distribution in aerosol

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