| 摘要 |
PURPOSE:To record the sounds or music with high quality by changing the feed speed of a recording medium in accordance with the quantizing frequency of a PCM signal to be recorded and therefore varying the recording time to the recording medium. CONSTITUTION:The audio signal sent from an audio signal souce 1 such as a tape recorder, etc. is supplied to a 16-bit linear PCM encoder 2 to undergo the A/D conversion into a 16-bit PCM signal having the quantizing frequency of 16. The audio signal is also supplied to an 8-bit differential PCM encoder 3 to undergo the A/D conversion into an 8-bit PCM signal having the quantizing frequency of 8. Then 16 output terminals which obtain the parallel PCM signals of 16 bits of the encoder 2 are connected to a fixed contact group 4a at one side of a changeover switch group 4 containing 16 changeover switches respectively. At the same time, the 8-bit parallel PCM signals obtained from the encoder 3 are supplied successively to 16 latch circuit 3a which store temporarily the PCM signals equivalent to two clocks. Then 16 output terminals of the circuits 3a are connected to a fixed contact group 4b. |
