초록 ▼

A data modem includes a data compression circuit which compresses incoming data prior to transmission. The compression ratio obtained from the compression process is used to select a constellation for transmission of the data. When higher compression rates are achieved, fewer constellation points (s

A data modem includes a data compression circuit which compresses incoming data prior to transmission. The compression ratio obtained from the compression process is used to select a constellation for transmission of the data. When higher compression rates are achieved, fewer constellation points (symbols) representing fewer bits per point are transmitted. In this manner, incoming data rate can be held constant while utilizing a more robust constellation which has greater immunity to transmission line impairments. This reduces errors and retransmissions which can ultimately lead to reduction in effective throughput in conventional systems.

대표청구항 ▼

A transmitter/modulator, comprising in combination: transmitting means for transmitting information over a transmission line, said information being represented by points in one of a plurality of selectable constellations, each said selectable constellation having a different number of points; compr

A transmitter/modulator, comprising in combination: transmitting means for transmitting information over a transmission line, said information being represented by points in one of a plurality of selectable constellations, each said selectable constellation having a different number of points; comprissing means for compressing information to be transmitted by said transmitting means; and selecting means, responsive to said compressing means, for selecting one of said plurality of constellations based upon a level of compression obtained by said compressing means.