JPS6488597A - Acoustic signal formation circuit - Google Patents

Acoustic signal formation circuit

Info

Publication number
JPS6488597A
JPS6488597A JP24385987A JP24385987A JPS6488597A JP S6488597 A JPS6488597 A JP S6488597A JP 24385987 A JP24385987 A JP 24385987A JP 24385987 A JP24385987 A JP 24385987A JP S6488597 A JPS6488597 A JP S6488597A
Authority
JP
Japan
Prior art keywords
signal
circuit
tremolo
call button
chime sound
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
JP24385987A
Other languages
Japanese (ja)
Inventor
Mitsuhiro Matsuda
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.)
Toshiba Electric Equipment Corp
Original Assignee
Toshiba Electric Equipment 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 Toshiba Electric Equipment Corp filed Critical Toshiba Electric Equipment Corp
Priority to JP24385987A priority Critical patent/JPS6488597A/en
Publication of JPS6488597A publication Critical patent/JPS6488597A/en
Pending legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE: To output both of a chime sound and a tremolo by switching and to reduce the number of parts to reduce the cost by adding a feedback circuit. CONSTITUTION: An acoustic signal generation circuit has a simple constitution where a resistance R2, a capacitor C1, and an inverter A3 are only added. If a signal in the high level is applied to a control signal input terminal P1 with a master machine call button of a doorphone device on and a signal in the low level is applied there with this call button off, the chime sound is emitted as a ringing tone in accordance with turning-on/off of the master machine call button. If a signal in the high level is applied to a control signal input terminal P2 with an extension switch of the doorphone device on and a signal in the low level is applied there with this switch off, the tremolo is emitted as the ringing tone during turning-off of this extension switch. Thus, the chime sound and the tremolo are outputted from one circuit by switching, and the circuit is simplified, and the number of parts and the cost are reduced.
JP24385987A 1987-09-30 1987-09-30 Acoustic signal formation circuit Pending JPS6488597A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24385987A JPS6488597A (en) 1987-09-30 1987-09-30 Acoustic signal formation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24385987A JPS6488597A (en) 1987-09-30 1987-09-30 Acoustic signal formation circuit

Publications (1)

Publication Number Publication Date
JPS6488597A true JPS6488597A (en) 1989-04-03

Family

ID=17110028

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24385987A Pending JPS6488597A (en) 1987-09-30 1987-09-30 Acoustic signal formation circuit

Country Status (1)

Country Link
JP (1) JPS6488597A (en)

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