H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/82
H04M 1/60 (2006.01) H04M 19/08 (2006.01)
Patent
CA 1226983
ABSTRACT: "Audio transmisson circuit comprising a transmit amplifier in the form of a line voltage stabiliser" Transmit amplifier which also stabilises the line direct voltage for the audio transmission circuit of a telephone set. By choosing according to the invention a suitable structure of the transmit amplifier which functions at the same time as a line voltage stabiliser, the gain is variable by means of a resistor which does not affect the further properties of the audio transmission circuit, A high gain is possible; spread in the line direct voltage by offset of the microphone pre-amplifier preceding the transmit amplifier and by temperature fluctuations of the reference voltage is greatly reduced in accordance with the invention by increasing the reference voltage and by adding a temperature-dependent current source.
474306
Otten Henricus J.m.
Sijbers Peter J.m.
Van Der Plaats Petrie J.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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