| 摘要 |
<p>An information recording medium is provided with a first signal recording area (A) in which first data are recorded, and second signal recording area (B) which is provided outside the area (A) and in which second data including the same information as that of the first data are recorded at a density higher than the recording density of the first data. The recording density of the second data can be two to ten times as high as that of the first data. The sampling rate, the number of quantizing bits, and the number of picture elements of the second data may be larger than those of the first data. In addition, the first data may be recorded at a fixed transfer rate and the second data may be recorded at a variable transfer rate. The first data may be music signals in an audible range, and the second data may be music signals in an ultrasonic range outside the audible range.</p> |
