| 摘要 |
PURPOSE:To prevent completely a switching noise from being generated in a reproduced sound signal outputted from a sample-and-hold circuit by applying sampling to the reproduced sound signal in a timing before a prescribed time from a leading edge and a trailing edge of a head switching timing pulse. CONSTITUTION:Sample-and-hold pulses B1 or B2 are provided with a sampling edge having a timing earlier by a prescribed time (DELTAt: nearly several musec) than the leading timing and trailing timing of a head switching pulse. A sample- and-hold circuit 5, when it receives the sample hold pulse B1 or B2, samples immediately a reproduced sound signal I at the sampling edge. Then the signal subjected to sampling is held until the effect of noise due to the leading edge and trailing edge of the head switching pulse A is lost. |
