Signal processsing circuit for a telephone set
AssigneesPioneer Electronic Corporation, Pioneer Video Corporation
InventorsNorikazu Fujie, Hitoshi Sugiyama
Life of this patent
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Abstract
A signal processing circuit for a telephone set. This circuit includes signal sending means that sends to a transmission line a sound signal produced from a telephone transmitter, a first adding circuit that adds the signal from the transmission line to the sound signal from the transmitter, an inverting circuit that phase-inverts the output signal from the first adding circuit, an impedance element provided between the transmission line and the output of the inverting circuit, and a second adding circuit that adds the output sound signal from the transmitter to the output signal from the inverting means and supplies the resulting composite signal to a telephone receiver.
Claims3
A signal processing circuit for a telephone set, comprising:
- signal sending means for sending to a transmission line a sound signal produced from a telephone transmitter;
- first adding means for adding the signal from said transmission line to said sound signal;
- inverting means for phase inverting an output signal from said first adding means;
- an impedance element provided between said transmission line and an output of said inverting means;
- and
- second adding means for adding said sound signal to said output signal from said inverting means and supplying the resulting composite signal to a telephone receiver.
Dependencies are inferred from the claim text.