Method for correcting telephone signal degradation caused by the length of the analog line via the receiver

A method of correcting a degradation of a telephone signal caused by an analogue line length between first and second telephone receivers,

• said method comprising a step of correcting the degradation of the telephone signal caused by the length of a local analogue line connecting the first telephone receiver to a telephone network,
• said method being used by said first telephone receiver and wherein said method comprises:
• a step of obtaining first information on the length of the local analogue line,
• a step of obtaining second information on the length of a distant analogue line connecting the second receiver to said telephone network;
• a step of correcting the degradation of the telephone signal according to the obtained first and second length information wherein correction means are used that comprise a digital equalizer programmed by a continuous gain function or analog filters for applying gain steps according to the stored first and second length information and the frequency of the telephone signal, said correction means being used during a call between the telephone receiver and the distant second telephone receiver;
• and
• a step of selecting an operating mode from at least one of the following modes:
• a first correction mode in which no correction of the degradation of the telephone signal caused by the length of the local and distant analogue lines is made;
• a second correction mode in which only a correction of the degradation of the telephone signal caused by the length of the local analogue line is made;
• a third correction mode in which only a correction of the degradation of the telephone signal caused by the length of the distant analogue line is made;
• a fourth correction mode in which a correction of the degradation of the telephone signal caused by the length of the local and distant analogue lines is made.