JPS5578289A - Electronic time knocking circuit - Google Patents

Electronic time knocking circuit

Info

Publication number
JPS5578289A
JPS5578289A JP15246278A JP15246278A JPS5578289A JP S5578289 A JPS5578289 A JP S5578289A JP 15246278 A JP15246278 A JP 15246278A JP 15246278 A JP15246278 A JP 15246278A JP S5578289 A JPS5578289 A JP S5578289A
Authority
JP
Japan
Prior art keywords
signal
circuit
audio
tone
inputted
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
JP15246278A
Other languages
Japanese (ja)
Inventor
Minoru Kuroda
Hiroshi Itoyama
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP15246278A priority Critical patent/JPS5578289A/en
Publication of JPS5578289A publication Critical patent/JPS5578289A/en
Pending legal-status Critical Current

Links

Landscapes

  • Electric Clocks (AREA)

Abstract

PURPOSE: To correct the dispersion in the sound tone of time knocking tone due to the frequency characteristic deviation of speakers at manufacture, by picking up only required components in the spectrum for the audio synthesis signal through the filter circuit.
CONSTITUTION: The audio signal in frequencies f1 and f2 is inputted to the NOR circuit NOR1 to be audio synthetis signal with synthesis. This signal is inputted to the transfer gate TG3 of the modulation circuit 16 via the filter circuit 23. The circuit 23 consists of the FET active circuit and the circuit time constant is set so that required components only are picked up among the spectrum of audio synthesis signal. On the other hand, the knock tone period pulse signal is inputted to the circuit 16 and attenuation signal to turn on and off the transfer gate TG2. This attenuation signal is integrated with the audio synthesis signal and knock tone signal is obtained when it is modulated with the carrier as the attenuation signal. This signal is amplified at the amplifying circuit 18 to drive the speaker 19 having the frequency performance including the selective spectrum being the output of the circuit 23.
COPYRIGHT: (C)1980,JPO&Japio
JP15246278A 1978-12-08 1978-12-08 Electronic time knocking circuit Pending JPS5578289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15246278A JPS5578289A (en) 1978-12-08 1978-12-08 Electronic time knocking circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15246278A JPS5578289A (en) 1978-12-08 1978-12-08 Electronic time knocking circuit

Publications (1)

Publication Number Publication Date
JPS5578289A true JPS5578289A (en) 1980-06-12

Family

ID=15541034

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15246278A Pending JPS5578289A (en) 1978-12-08 1978-12-08 Electronic time knocking circuit

Country Status (1)

Country Link
JP (1) JPS5578289A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102290046A (en) * 2011-07-15 2011-12-21 莱州市金声汽车电器有限公司 Snail electric horn

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102290046A (en) * 2011-07-15 2011-12-21 莱州市金声汽车电器有限公司 Snail electric horn

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