Len Ovens:
...
> I was unable to find how dat tape machines encode and send text and marker
> information.
...
I haven't worked with DAT at all, but in:
Michael Dickreiter
Handbuch der Tonstudiotechnik
6. verbesserte Auflage
pages 320 to 330 covers RDAT (i.e. DAT):
Abb. 10/60. Spurschema des RDAT-Formats (in blocks):
11 Vor- bzw. Nachspann (margin)
2 Bittakt-Synchronisation (PLL)
8 Zusatzdaten (subcodes)
1 Abschluß-Kennung (postamble)
3 Blocklücke (Interblock gap)
5 ATF (automatic track findung)
3 Blocklücke (Interblock gap)
2 Bittakt-Synchronisation (PLL)
128 PCM
3 Blocklücke (Interblock gap)
5 ATF (automatic track findung)
3 Blocklücke (Interblock gap)
2 Bittakt-Synchronisation (PLL)
8 Zusatzdaten (subcodes)
1 Abschluß-Kennung (postamble)
11 Vor- bzw. Nachspann (margin)
Abb. 10/61. Blockstruktur des RDAT-formats (in bytes):
1 Sync.
1 Ident-Code
1 Block-Adresse
1 Prüf-wort (= ident-code xor block-adresse)
32 Daten-byte
Abb. 10/63. Aufbau des Bockadressen-Byte:
0 Ad1 Ad2 Ad3 Ad4 Ad5 Ad6 Ad7 Audiodatenblock 0 ... 127
1 _ _ _ Ad1 Ad2 Ad3 Ad4 Zusatzdatenblock 0 ... 16
There are A and B tracks (+ or - 20° azimuth angle).
The data blocks (4kB per track) is in some semi complex way extracted as
1440 geradzahlige abtastwerte
768 Q-Prüfwerte
1440 ungeradzahlige abtastwerte
Track A contains L-odd Q R-even
Track B R-odd Q L-even
The above is the on tape format. Whatever comes out of a connector
depends on what type of interface the recorder has.
For more information see:
Biaesch-Wiebke, C.: CD-Player und R-DAT-Recorder, 1. Aufl. 1988, Vogel
Regards,
/Karl Hammar
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Received on Thu Nov 23 16:15:01 2017
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