IEC 61595-2:1997 pdf download – Multichannel digital audio tape recorder (DATR),reel-to-reel system, for professional use- Part 2: Format B

IEC 61595-2:1997 pdf download – Multichannel digital audio tape recorder (DATR),reel-to-reel system, for professional use- Part 2: Format B.
This part of lEG 61595 applies to 24 to 96 channel digital audio recording on 12.7 mm or 25.4 mm wide tape (hereinafter called tape), with stationary heads, for professional use. It defines the mechanical and electrical characteristics necessary to ensure the interchangeability of programmes, recorded as digital audio signals on magnetic tape, in professional Industries.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of lEG 61595. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61595 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
lEG 60461: 1986, Time and control code for video tape recorders
IEC 61120-4: 1992, Digital audio tape recorder reel-to-reel system, using 6.3 mm magnetic tape. for professional use – Part 4: Magnetic tape properties: detinitons and method of measurement
ITLJ-T VAt: 1988. Code-independent error contro’ system
3 DefInItIons
For the purpose of this part of IEC 61595, the following definitions apply.
31 Data flow of a digital audio tape recorder
Figure 1 shows, within a block diagram. the main data flow of a DATR (digital audio tape recorder)
Figure 2 shows the recording channels of a DAIR.
Figure 3 shows the reproducing channels of a DATR.
12 Main track recording
12.1 Recording modulation method
In this subclause, the modulation of a binary data sequence (“incoming data”) into a record signal waveform (“output waveform”) is specified. Next, a synchronization pattern violating the modulation rules is defined.
The data to be recorded on the main tracks are first channel-coded. A run-length-limited code called HDM-1 is used, which is not d.c. free.
The output waveform is defined by two cells for each input data bit. Only transitions in the output waveform are defined; the output data is independent of waveform polarity. Rules for generating a pair of output waveform cells for each input bit are defined in the following formulation and bit to waveform transitions are defined in rules 1 and 2.