Method and apparatus for transmitting data from an analogue modem to a digital modem through an analogue channel
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United States of America Patent
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Sep 13, 2005
Grant Date -
Nov 1, 2001
app pub date -
Mar 22, 2001
filing date -
Mar 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for transmitting data through an analogue channel from an analogue modem to a digital modem includes encoding data inputted to the analogue modem. An encoder encodes data inputted into the analogue modem into corresponding constellation points of a one-dimensional constellation. During initial handshaking a microprocessor in the digital modem computes the constellation points of the constellation so that mid points between adjacent constellation points coincide with mid points between adjacent codec levels. The computed constellation points of the constellation are transmitted along with the value of the largest constellation point and its corresponding codec level to the analogue modem. By selecting the mid points between the constellation points to correspond with mid points between adjacent codec levels the noise margin is significantly enhanced.
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