Volume control circuit for use in portable telephone or the like

Details Volume control circuit for use in portable telephone or the like Volume control circuit for use in portable telephone or the like

1988-01-28

1990-05-08

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

381 86, H03G 318, H04B 100

Patent

active

049241931

ABSTRACT:
A volume control circuit for a portable telephone set has two volume setting circuits. One of these circuits is activated when the telephone is used within a vehicle and the other is activated when the telephone is removed from the vehicle and carried about as a personal telephone. One embodiment selects between these two circuits by operating mechanical structures which are moved between two positions by physically attaching or removing the telephone to or from the vehicle. Another embodiment uses a microprocessor to make the selection responsive to the operation of a magnetically actuated reed switch.

REFERENCES:
patent: 3079559 (1963-02-01), Sehy
Kobayashi, K. et al., "Detachable Mobile Radio Units for the 800 Mhz Land Mobile Radio System", 34th IEEE Vehicular Technology Conference, May 21, 1984, pp. 6-11.

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