Re: [LAU] Recording from S/PDIF

From: <karl@email-addr-hidden>
Date: Thu Nov 23 2017 - 13:37:19 EET

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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Lilla Aspö 148
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Received on Thu Nov 23 16:15:01 2017

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