Initial training apparatus for use in a transmitter and receiver apparatus

An initial training apparatus for training a communication apparatus, comprising:

• an echo canceler, connectable to receive a training signal, producing a replica echo signal responsive to the training signal;
• and
• an automatic equalizer having a gain and operatively connected to said echo canceler, said automatic equalizer including
• means for setting the gain to an initial gain;
• means for training said automatic equalizer to set the gain to an adaptive gain in dependence upon the training signal;
• means for dividing the adaptive gain by the initial gain and for providing a result based on the dividing;
• and
• means for multiplying the echo replica signal by the result to correct the echo replica signal.

An initial training apparatus for training a communication apparatus, comprising:

• hybrid circuit means for transmitting a transmission signal and for receiving a first signal having a power;
• automatic equalizing means, operatively connected to said hybrid circuit means, for receiving an echo signal when said hybrid circuit means transmits the transmission signal and when said hybrid circuit receives the first signal, for obtaining a gain responsive to the power of the first signal, for providing an adaptive gain and for providing an output signal;
• echo cancelling means for receiving a transmission pulse and for producing an echo replica signal to minimize the residual echo signal and for outputting the echo replica signal after said communication apparatus has received the transmission pulse;
• gain correcting means for correcting a gain of said echo cancelling means based on the adaptive gain obtained by said automatic equalizing means;
• and
• subtracting means for forming an echo residual signal by obtaining a difference between the echo replica signal after the gain correction is applied to the echo replica signal and the output signal from said automatic equalizing means.

An initial training apparatus, comprising:

• echo canceler means, connectable to receive a first signal, for producing a replica echo signal based on the first signal;
• automatic equalizer means, having an initial gain and connectable to receive the first signal and for providing an adaptive gain based on the first signal and the initial gain;
• means for dividing the adaptive gain by the initial gain;
• gain correcting means for providing a ratio responsive to the dividing of the adaptive gain by the initial gain by said means for dividing;
• and
• correction means for correcting the replica echo signal based on the ratio and the replica echo signal.

An initial training method for correcting a replica echo signal produced by a transceiver having an initial gain, after transmitting a signal, comprising the steps of:

• a) determining an initial gain of the transceiver after transmitting the signal;
• b) performing an initial training of an echo canceler;
• c) performing an initial training of an automatic gain control;
• and
• d) correcting the replica echo signal produced by the echo canceler according to a gain of the automatic gain control and the initial gain.