| 摘要 |
<p>Digital data, such as a digital audio signal which differs from a two-channel digital audio signal in sampling frequency and number of quantized bits, or display data or program data, can be recorded in the same signal format as that of a two-channel digital audio signal. A code signal specifying that either a two-channel digital audio signal or digital data has been recorded, and control data giving the linear velocity of a digital disc during reproduction are inserted into every frame of a recording signal. One block of digital data is formed of a predetermined quantity of data, and the same control data as that employed to control digital processing is recorded at least twice in each block. During reproduction, the digital disc is rotated to provide a constant linear velocity in accordance with the control data, and a reproduction circuit is supplied with a clock signal of a frequency corresponding to the transfer rate of the reproduced data. The reproduced digital audio data from the reproduction circuit is converted to analog data, and the passband of a low-pass filter supplied with the reproduced analog audio signal can be made to conform to the band of the reproduced analog audio signal. </p> |
