Sharp RX-P1H Technisches Handbuch Seite 22

RX-P1H
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3. SUBCODES
3-1. Outline
The subcodes are roughly divided into two groups, namely
subsignals called PCM-ID which are recorded in the PCM area,
and the subsignals called the subcode which are recorded in the
subcode area.
PCN-ID is recorded together with PCM data which is main signal
(music signal). It is a control signal to reproduce the main signal,
such as sampling frequency and emphasis.
The subcodes in the subcode area include the top search signal
start ID, PNO-ID indicating the program number, and program
time indicating the duration of program. The signals in the
subcode area can be rewritten even after recording while the
main signal is left.
Subcode—— PCM-ID Format classification
Figure 3-2 shows the configuration of subcode on the tape.
PCM-ID is allocated to 8 bits in every other 64 blocks of 128
blocks, and 8 blocks compose one subframe. Accordingly, one
track contains 16 subframes. PCM-ID is rewritten up to 16 times
in the track. Figure 3-3 shows the configuration of PCM-ID in the
PCM area whereas Table 3-1 shows its content. 8 blocks for
subsignal of subcode area are located near both ends of track,
namely 16 blocks inall. The two blocks are paired for multi-writing.
Figure 3-4 shows the configuration and content of subcode area.
(Subsignals in L— Emphasis
PCM area) i Sampling frequency
| Number of channels
+ Number of quantized bits
'— Track pitch
| Copy
+— Pack
—— Optional code Search code
| Auxiliary code
|___ Subcode —______- Subcode ID Control 1D —————--—_ TOC-ID
(Subsignals in L- PNO-ID I— Shortening ID
subcode area) Format ID I— Start ID
Priority ID
Subcode data (PACK)
Program time \
Absolute time
Running time
TOC calendar
Catalog
Figure 3-1 Classification of subcodes
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