| 摘要 |
PURPOSE:To prevent an acoustic output from a front loudspeaker from being distorted even when the low sound level of a rear channel is increased by independently executing sound quality control at front and rear channels. CONSTITUTION:By using a digital signal processor(DSP) 2, an audio signal to be supplied to an A/D converter 1 is converted to digital audio signal data for each prescribed sampling period, supplied through an interface 3 to a data memory 17 and stored. An equivalent circuit for the operation of the DSP 2 is composed of a low sound control circuit 25 for front, high sound control circuit 26, low sound control circuit 27 for rear and high sound control circuit 28. Then, sound quality control means 25-28 for front and rear are provided to independently execute the sound quality control at the front and rear channels. |
