Channel transmission characteristic obtaining method and apparatus

A channel transmission characteristic obtaining apparatus, comprising:

• a receiver configured to obtain a plurality of transmission characteristic curves of a plurality of channels in a cable modem in a channel scanning manner, one transmission characteristic curve reflecting amplitudes of one channel at all frequencies, the channels forming one contiguous frequency band, and frequencies corresponding to the transmission characteristic curves of the channels comprising frequency values on a same order of magnitude and amplitude values on a same order of magnitude;
• and
• a processor coupled to the receiver and configured to:
• translate the transmission characteristic curves of the channels in an amplitude direction to make amplitudes corresponding to same frequencies on all transmission characteristic curves overlapped in order to form one continuous curve;
• and
• set the continuous curve as a transmission characteristic curve of the contiguous frequency band.

A server, comprising:

• an interface circuit configured to obtain a plurality of transmission characteristic curves of a plurality of channels in a cable modem in a channel scanning manner, one transmission characteristic curve reflecting amplitudes of one channel at all frequencies, the channels forming one contiguous frequency band, and frequencies corresponding to the transmission characteristic curves of the channels comprising frequency values on a same order of magnitude and amplitude values on a same order of magnitude;
• and
• a processor coupled to the interface circuit and configured to:
• translate the transmission characteristic curves of the channels in an amplitude direction to make amplitudes corresponding to same frequencies on all transmission characteristic curves overlapped to form one continuous curve;
• and
• set the continuous curve as a transmission characteristic curve of the contiguous frequency band.