Digital intercom system and digital walkie -Talkie

The utility model provides a digital intercom system and digital walkie -Talkie, its integration including possessing zero intermediate frequency digital communication function chip of talkbacking, the integrated chip of talkbacking is used for adopting the function algorithm, generates and export the step wave of rising edge gradual change and falling edge gradual change, and operation comparing element involves power amplifier unit's the real -time power that amplifies according to the ladder, output offset voltage, power amplifier unit treats signal processing and carries out power amplification according to offset voltage, like this, digital intercom system has realized that the use step wave generates offset voltage, the enlarged power of control power amplifying unit root, because the rising edge of step wave and falling edge all are slow gradual changes, the change that corresponds offset voltage also change gradually, and then power amplifier unit's enlarged power slowly rises and descend, and it need