Transmission apparatus, reception apparatus and communication ap

Details Transmission apparatus, reception apparatus and communication ap Transmission apparatus, reception apparatus and communication ap

1997-10-17

2000-04-18

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375296, 375340, 375371, H04B 138

Patent

active

060524103

ABSTRACT:
A transmission apparatus applied as a modem connected to a private branch exchange discriminates coordinates of an analog signal inputted thereto on a two-dimensional coordinate plane and transmits the signal, whose coordinates have been discriminated, as a digital signal. The transmission apparatus includes a frequency shifting section for performing frequency shifting for the inputted analog signal so that a tone signal of a single frequency may be a dc signal, and a coordinate discrimination section for discriminating coordinates on the two-dimensional coordinate plane of the analog signal for which the frequency shifting by the frequency shifting section has been performed. By the transmission apparatus, a single tone signal is transmitted without suffering from deterioration of the S/N ratio and so forth.

REFERENCES:
patent: 4542369 (1985-09-01), Kasuga

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