Speaker drive arrangement for loudspeaker telephone

Details Speaker drive arrangement for loudspeaker telephone Speaker drive arrangement for loudspeaker telephone

1989-07-12

1991-06-25

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379390, 379395, H04M 160

Patent

active

050273922

ABSTRACT:
In a loudspeaker telephone, improved power transfer is achieved by connecting the drive circuit for the loudspeaker in parallel with the input and output of the usual series regulator, the output of the regulator and one of the power supply connections of the drive circuit being connected, in common, to supply other circuitry in the telephone set. This other circuitry might comprise a microprocessor and other signal processing circuitry. Such a configuration means that the current passing through the speaker drive circuit also passes through the other circuitry. In effect, it is "re-used" instead of being added, as would be the case if the drive circuit were connected in parallel with the other circuitry. In the case of a positive series regulator, the series regulator supplies current when the current requirement of the other circuitry exceeds that received from the drive circuit. When the current from the drive circuit exceeds that required by the other circuitry, the series regulator is arranged to sink the excess current. A suitable push-pull regulator may comprise a power operational amplifier.

REFERENCES:
patent: 4376876 (1983-03-01), Versteeg et al.
patent: 4640493 (1987-03-01), Whittaker
patent: 4731831 (1988-03-01), Cosgrove et al.
patent: 4856057 (1989-08-01), Snith et al.
Signetics Corporation, 5556 Operational Amplifier, 1972, Signetics Component catalog, pp. 6-142 through 6-144.

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