Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-08-02
1992-06-30
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358330, 358340, 307490, 328145, H04M 5213
Patent
active
051268469
ABSTRACT:
A non-linear amplifier circuit comprises a low band eliminating filter for receiving an input signal from an input terminal, a logarithmic amplifier and an adder for adding the output signal of this logarithmic amplifier and the input signal with a predetermined polarity relationship to produce an output signal and sending this output signal to an output terminal. The logarithmic amplifier comprises an amplifier for receiving the output signal of the low band eliminating filter, a bidirectional logarithmic element and a resistor coupled in parallel thereto between the input and output terminals of the amplifier.
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Kabushiki Kaisha Toshiba
Parker Michael D.
Shepperd John W.
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