Audio signal processing device and method for preventing signal distortion

An audio signal processing device for preventing signal distortion, the audio signal processing device comprising:

• an analog gain amplification circuit comprising at least one analog gain amplifier and receiving an analog audio input signal, wherein the analog audio input signal is processed into a first amplified analog audio input signal by the at least one analog gain amplifier through an analog gain amplification process, wherein at least one analog gain magnification factor is provided in the analog gain amplification process;
• a peak detection circuit electrically connected with the at least one analog gain amplifier, wherein the analog audio input signal is processed into a second amplified analog audio input signal by the at least one analog gain amplifier through the analog gain amplification process, and the peak detection circuit generates a peak detection signal according to the second amplified analog audio input signal;
• a codec and digital gain amplifier electrically connected with the analog gain amplification circuit and the peak detection circuit, and receiving the first amplified analog audio input signal and the peak detection signal, wherein the first amplified analog audio input signal is processed into an analog audio output signal by the codec and digital gain amplifier through an analog-to-digital conversion process, a digital gain amplification process and a digital-to-analog conversion process sequentially, and a digital gain amplification factor is provided in the digital gain amplification process;
• a time delay circuit included in at least one of the codec and digital gain amplifier and the analog gain amplification circuit to provide a signal delay time;
• and
• an audio output processing circuit electrically connected with the codec and digital gain amplifier, wherein the analog audio output signal is processed into a processed output signal by the audio output processing circuit,
• wherein in the signal delay time, the codec and digital gain amplifier estimates and judges whether a multiplication result of the peak detection signal, the at least one analog gain amplification factor, and the digital gain amplification factor exceeds a peak threshold value, and when the multiplication result exceeds the peak threshold value, the at least one analog gain amplification factor and/or the digital gain amplification factor is reduced for preventing the signal distortion.