Sound signal processor and method for processing sound signal using the same

An apparatus for processing a sound signal, comprising:

• a system discriminator for determining a sound system according to sound system data included in the sound signal;
• a channel mode discriminator for determining a current sound mode of the received sound signal;
• a mode transition checker for performing a checking operation to determine whether the current sound mode has resulted from a transition from a first sound mode to a second sound mode;
• a demodulator for demodulating the sound signal according to the determined sound system and the determined current sound mode;
• a detector for detecting an amplitude of the demodulated sound signal;
• and
• a controller for controlling a drive of said mode transition checker according to the detected amplitude of the sound signal.

A method of processing a sound signal, the method comprising:

• determining a current sound mode of the sound signal;
• checking the determined current sound mode to detect a transition from a first sound mode to a second sound mode;
• measuring an amplitude of the received sound signal;
• and
• repeatedly performing said checking according to the measured amplitude.

A method of processing a sound signal in an apparatus for processing a sound signal including sound system data, the method comprising:

• determining a sound system according to the sound system data;
• determining a current sound mode of the received sound signal;
• a mode transition checker for performing a checking operation to determine whether the determined current sound mode has resulted from a transition from a first sound mode to a second sound mode;
• a demodulator for demodulating the sound signal according to the determined sound system and the determined current sound mode;
• detecting an amplitude of the demodulated sound signal;
• and
• controlling a drive of the mode transition checker according to the detected amplitude of the sound signal.

A television receiver having an apparatus for processing a sound signal, comprising:

• a system discriminator for determining a sound system according to sound system data included in the sound signal;
• a channel mode discriminator for determining a current sound mode of the received sound signal;
• a mode transition checker for performing a checking operation to determine whether the determined current sound mode has resulted from a transition from a first sound mode to a second sound mode;
• a demodulator for demodulating the sound signal according to the determined sound system and the determined current sound mode;
• a detector for detecting an amplitude of the demodulated sound signal;
• and
• a controller for controlling a drive of said mode transition checker according to the detected amplitude of the sound signal.