LPC codec

Linear Predictive Coding (LPC) is another standard of the DoS. It uses sources coding techniques. Thus, instead of sending the speech signal, a best fit between the original signal and a filter is calculated. Then the best matching parameters of this filter are sent to the decoder. An LPC decoder uses those parameters to generate synthetic speech that is usually more-or-less similar to the original. The result is intelligible but sounds like a machine is talking. The output bit rate is 2.4 Kbps.