Communications: electrical – Audible indication – Electronic
Patent
1997-09-18
1999-11-16
Lefkowitz, Edward
Communications: electrical
Audible indication
Electronic
3403845, 34038471, 340692, 3406933, G08B 1310
Patent
active
059865407
ABSTRACT:
A sound signal generating device capable of generating an alarm sound signal and voice signal for a prolonged period of time having a power supply, a memory for storing data in relation to a help sound signal digitally, a D/A converting circuit for converting the stored data into an analog signal, a sound output circuit for outputting the help sound signal in response to the analog signal and a switching circuit for selectively applying the power supply to the sound output circuit when being activated by a control signal. The sound signal generating device also has a control circuit for generating a first control signal to enable a successive reading of the stored data and activate the switching circuit at the same time of the reading and for generating a second control signal when the reading is completed to deactivate the first control signal for a predetermined interval and then reset the same. When the first control signal is deactivated during the predetermined interval, the switching circuit disables the sound output circuit to thus minimize the consumption of power supply.
REFERENCES:
patent: 4472069 (1984-09-01), Yamamoto
patent: 4926159 (1990-05-01), Bartlett
patent: 5604479 (1997-02-01), Chang
patent: 5754094 (1998-05-01), Frushour
patent: 5883573 (1999-03-01), Mazeiko, Jr. et al.
Hoshino Kenzou
Matsuda Yukio
Nakagaki Koutaro
Nakao Kinya
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