Multi-line, multi-mode modulator using bandwidth reduction...

Details Multi-line, multi-mode modulator using bandwidth reduction... Multi-line, multi-mode modulator using bandwidth reduction...

H - Electricity

03

C

354/67

H03C 3/02 (2006.01) H04J 3/04 (2006.01) H04J 9/00 (2006.01)

Patent

CA 1081848

MULTI-LINE, MULTI-MODE MODULATOR USING BANDWIDTH REDUCTION FOR DIGITAL FSK AND DPSK MODULATION Abstract A multi-line multi-mode modulator uses compatible digital modulation techniques for multifrequency (MF), frequency shift keyed (FSK) and differential phase shift keyed (DPSK) modulation to achieve a multi-line multi-mode modulator which is capable of handling a plurality of lines requiring a dynamic mix of the three modulation techniques. The compatible modulation techniques utilize bandwidth reduction schemes which enable the use of simple RC fil- ters on each output line for the sole purpose of removing the quantizing noise introduced by the digital modulation technique.

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