Title:
DUAL-TONE GENERATOR
Document Type and Number:
Japanese Patent JPS5612110
Kind Code:
A
Abstract:
PURPOSE: To obtain a simple dual-tone generator of constitution that can generate a dual-tone signal only by one oscillator and one divider.
CONSTITUTION: A signal of frequency (f) from oscillator 21 is applied to frequency divider 22, which frequency-divides the signal of frequency (f) to generate audible signal tones of different frequencies f/K1, f/K2 and f/K3. Through switch 23, signals f/K1 and f/K2 are sent to output line 24 by turns. Signal f/K3, on the other hand, is used as a switching signal for switching switch 23. A dual-tone signal obtained in this way is used as an alarm tone.
More Like This:
| WO/1996/016472 | MULTI-FREQUENCY LOCAL OSCILLATORS |
| JPH05121942 | TONE OSCILLATOR |
Inventors:
MORITA TOSHIYUKI
MISHIRO TOKIHIRO
DEGUCHI TAKASHI
MISHIRO TOKIHIRO
DEGUCHI TAKASHI
Application Number:
JP8706379A
Publication Date:
February 06, 1981
Filing Date:
July 10, 1979
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H03B25/00; (IPC1-7): H03B25/00
Domestic Patent References:
| JP54094147B | ||||
| JPS5313059B2 | 1978-05-08 |