| 摘要 |
<p>PURPOSE:To accurately perform the program-searching of a sound by calculating a position tracing back by a specified time corresponding to the level of an envelope line in a specified band and writing a position signal on the position of relevant time of a previously recorded signal. CONSTITUTION:A signal frequency range 10-22kHz is divided into five by a band analysis means 3 and converted to the envelope lines of level fluctuation in respective bands. The envelope lines of these respective bands are compared with a specified level by a band level comparing means 4. The level coincidence signal of the specified band is selected from the level coincidence signals in respective bands outputted from the means 4 in a time calculating means 5 and compared with a time signal from a recording and reproducing means 2 and a time lag in analog conversion and the starting time of the recording and reproducing means are added to it, and the position tracing back the time is regarded as a position writing time. By a display means 6, the envelope lines of respective bands of reproduced sounds are displayed and the sound desired is in any band is cleared, and whether the resetting of a comparison level is necessary or not, as well is read.</p> |
