JPS6488597A - Acoustic signal formation circuit - Google Patents
Acoustic signal formation circuitInfo
- 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
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.
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) |
-
1987
- 1987-09-30 JP JP24385987A patent/JPS6488597A/en active Pending
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