| 摘要 |
PURPOSE:To attain long time recording by reducing the amount of quantization, decreasing the sampling frequency and using a minimum required amount of recording signals to increase the recording density on a recording medium. CONSTITUTION:A part of an output of a buffer 10 is fed to a filter 13, where the frequency component is divided and the result is fed to a frequency component detector 14 and a level detector 15, the maximum level in a frame is detected by the level detector 15 and the maximum frequency is detected by the frequency component detector 14. That is, the amount of quantization and the sampling frequency at recording are detected. A quantization amount controller 16 decides the inputted amount of quantization and outputs it to a quantized amount sampling frequency controller 12, and a sampling frequency controller 17 receives an output of the detector 14 at the same time and decides the sampling frequency in the frame and outputs the frequency to the controller 12. The controller 12 samples and processes the signal outputted from a memory 11 based on the amount of quantization decided by the controller 12 and the sampling frequency decided by the controller 17. |
