Digital Signal Processor and Audio Device

摘要

A digital signal processor that is capable of suppressing a signal level of an input analog signal at not more than the maximum voltage for A/D conversion and capable of preventing distortion of an A/D converted digital signal while maintaining a good S/N ratio. The digital signal processor 2 of the present invention includes amplification factor setting mechanisms to set amplification factors of the analog amplifiers to second amplification factors lower than first amplification factors specified by amplification factor adjustment knobs, digital amplifier mechanisms to amplify A/D converted digital signals by third amplification factors lower than the first amplification factors, and digital limiter mechanisms to compare the signal levels of the digital signals amplified by the third amplification factors with a threshold defined in advance and attenuate the digital signals within the range of the third amplification factors based on a result of the comparison.

主权项

1. A digital signal processor performing control of an amplification factor of an analog amplifier to amplify an analog sound signal and processing of a digital signal obtained by A/D conversion of the analog signal, the processor comprising:
an amplification factor setting mechanism to set the amplification factor of the analog amplifier to a second amplification factor lower than a first amplification factor specified by an operation unit; a digital amplifier mechanism to amplify the A/D converted digital signal by a third amplification factor lower than the first amplification factor; and a digital limiter mechanism to compare a signal level of the digital signal amplified by the third amplification factor with a threshold defined in advance and attenuate the digital signal within a range of the third amplification factor based on a result of the comparison.