Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1988-02-03
1991-06-18
Dwyer, James L.
Telephonic communications
Audio message storage, retrieval, or synthesis
379374, H04M 100
Patent
active
050254677
ABSTRACT:
An apparatus for producing an audible sound to indicate the occurrence of an incoming telephone call on a cellular telephone. The apparatus has a first circuit for producing a first waveform having a first voltage and a first frequency. The apparatus also has a second circuit for producing a second waveform, the second circuit being operably connected to the first circuit, thereby receiving the first waveform. The second waveform has a second voltage and a second frequency wherein the second frequency is proportional to the first voltage of the first waveform. The apparatus also has an amplifier for amplifying the second waveform to produce an amplified waveform, the amplifier being operably connected to receive the second waveform. The apparatus also has a sound generator for producing an audible sound from the amplified waveform wherein the sound generator is operably connected to receive the amplified waveform. The apparatus further has an enable circuit for enabling the audible sound to be produced in response to the incoming telephone call.
REFERENCES:
patent: 4076968 (1978-02-01), Wattenbarger
patent: 4214131 (1980-07-01), Bush et al.
patent: 4603317 (1986-07-01), Gailbreath et al.
patent: 4890315 (1989-12-01), Bendixen et al.
Cherry Semiconductor CS-8204, CS-8205, Telephone Tone Rinder Data Sheet, pp. 70, 71, 72, 1986.
Cherry Semiconductor CS-8205, Tone Ringer, Applications Note.
National Semiconductor LM-383 8 Watt Audio Power Amplifier Data Sheet, p. 57.
Dynatac 6000x Universal Mobile-Telephone, Motorola .COPYRGT. 1984.
Dwyer James L.
Hescor Canada Ltd.
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