Device for recovering missing frequency components

A band recovering device for recovering frequency components lying in a frequency band lost due to band-limitation of a sound signal, comprising:

• an amplitude limiter configured to limit an upper limit of a signal value of the input narrow-band signal;
• a detector configured to detect a level of the signal value of the input narrow-band signal;
• an amplitude-limit controller configured to decrease the upper limit in accordance with an output of said detector;
• and
• a band recovering circuit configured to generate, based on a signal output from said amplitude limiter and the input narrow-band signal, a band-recovered signal including the frequency components lying in the frequency band lost.

A telephone set comprising a band recovering device for recovering frequency components lying in a frequency band lost due to band-limitation of a sound signal, wherein a band recovering device comprises:

• an amplitude limiter configured to limit an upper limit of a signal value of the input narrow-band signal;
• a detector configured to detect a level of the signal value of the input narrow-band signal;
• an amplitude-limit controller configured to decrease the upper limit in accordance with an output of said detector;
• and
• a band recovering circuit configured to generate, based on a signal output from said amplitude limiter and the input narrow-band signal, a band-recovered signal including the frequency components lying in the frequency band lost.