Method and system for sample and recreation synchronization for digital transmission of analog modem signal
View Patent ↗A method and system for the synchronization of the transmission of digitally converted analog modem signals between two or more modems using either RF over-the-air or A/C power line communication channels. This invention provides for modem speed optimization my minimizing or eliminating clock variance between the modems in a digital communication system. A fixed delay is created and maintained during modem operation. This invention is also adapted to function in a full-duplex communication system maintaining a fixed delay in both directions.
1. A method of synchronizing a digital transmission of analog modem signals, comprising:
receiving, at a second modem, a first digital data signal from a first modem via a transmission medium, wherein:
said first digital data signal is received serially, and
said first digital data signal comprises a first sample clock signal, said first sample clock signal comprising a first start bit representing a delay;
detecting said first start bit by said second modem; generating, by said second modem, a first recreation clock signal based on said first start bit, wherein said first recreation clock signal comprises said delay;
converting said first digital data signal to a first analog signal by a first digital-to-analog converter;
generating, by said second modem, a second analog signal, said second analog signal comprises a second sample clock signal, said second sample clock signal comprising a second start bit;
converting, by a first analog-to-digital converter, said second analog signal to a second digital data signal; and
transmitting, by said second modem, said second digital data signal to said first modem via said transmission medium.
2. A method of synchronizing the digital transmission of analog signals, as recited in claim 1 , wherein said transmission medium is an A/C power line.
3. A method of synchronizing the digital transmission of analog signals, as recited in claim 1 , wherein said transmission medium is an over the air RF signal.
4. A method of synchronizing a digital transmission of analog signals, as recited in claim 1 , further comprising:
receiving, at said first modem, said second digital data signal from said second modem;
detecting said second start bit by said first modem;
generating, by said first modem, a second recreation clock signal based on said second start bit, wherein said second recreation clock signal comprises said delay;
converting said second digital data signal to a third analog signal by a second digital-to-analog converter;
generating, by said first modem, a fourth analog signal said fourth analog signal comprises a first sample clock signal, said first sample clock signal comprising said first start bit;
converting, by a second analog-to-digital converter, said fourth analog signal to a said first digital data signal; and
transmitting, by said first modem, said first digital data signal to said second modem via said transmission medium.