| 摘要 |
<p>PROBLEM TO BE SOLVED: To effectively reduce audio output noise through a real time processing by passing through a low-pass filter an analog output obtained by processing a signal reproduced from a defective part of a disk form recording carrier which cannot not be corrected and interpolated. SOLUTION: A selector 4b normally selects an input portα, and cuts off a power output of a D/A converter 3 as it is or cuts off the high frequency components of the audio signalϕ1 (minute defect part which causes the noise), and connects to an amplifier 5. While DSP 1 is detecting lacking data of the reproduced signal as a defective part which cannot be corrected and interpolated for tens ofμsec., DSP outputs the lacking detection signalϕ. The selector 4b responds to this and selects the input portβ, and connects the signalϕ2 cutting off high frequency components causing noise via LFP 4a from the output of the D/A converter 3 to an amplifier 5. The selector 4b is constituted of MOS transistor, etc., and may be arranged at a former stage of LPF 4a.</p> |
