H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/82
H04M 1/60 (2006.01)
Patent
CA 2014499
An in-line amplifier is readily connectable to a standard telephone so as to allow for user adjustment of the volume presented to the receiver portion 15 of the handset 14. The in-line amplifier draws electrical power from a replaceable battery 18 so as to be easily attached to the telephone base unit 12. The in-line amplifier includes a voltage level detector 20, which operates to determine when the battery voltage level has fallen below the minimum operating voltage of the in-line amplifier Ordinarily, the audio signal is passed from the telephone base unit l2 through a controllable amplifier 16 to the receiver portion 15 of the handset 14. However, when the voltage level detector 20 determines that the battery voltage level has fallen below the minimum operating voltage level, a signal is delivered to a low voltage bypass 17, providing a direct electrical path around the controllable amplifier l6 so as to couple the audio signal directly from the base unit 12 to the receiver 15. Within the controllable amplifier l6 a modified class B output stage is employed to provide the current driving capabilities necessary for proper operation of the receiver 15. The class B output stage is modified with a resistor 76 connected between the bases of transistor 62, 64 and their emitters, thereby passing the low level audio output signal from an operational amplifier 48 directly to the receiver 15 during the deadband portion of the class B output stage so as to reduce crossover distortion.
Gowling Lafleur Henderson Llp
Plantronics Inc.
LandOfFree
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