Sound quality enhancement circuit for audio signals and audio amplifier circuit using the same

摘要

The present invention comprises a circuit having at least not less than three cascade connected phase shift circuits and wherein the phase characteristic of the circuit is determined in such a manner that the phase of the audio input signals is gradually delayed depending on logarithmic increase of frequencies in a range of audible frequencies and a phase delay in a range of 450 degree~600 degree in total in the range of audible frequencies is caused.