8-channel Tascam I/O Board

  • 8 channels
  • Combined I/O board
  • DSP built-in
  • Output-signal re-quantizing to 16 or 20 bits with dithering and noise shaping
  • I/O sample-rate converter (option)

 data sheet (175 kb)

The NEXUS TDIF 8-channel board is an interface to the TDIF format by Tascam. This format connects, for example, to the DA 88 and DA 98 digital tape machines.
The inputs and outputs can be equipped with sample-rate converters for handling asynchronous signals.
The XTF includes a signal processor allowing for various processing operations:

  • Separate input-gain adjustment
  • Input-phase inversion
  • Output-signal re-quantization with noise shaping and dithering

Variable Output Formats

The XTF board provides for re-quantization of NEXUS 24-bit data to 16-bit or 20-bit formats for external applications. Inaccuracies emerging from truncation errors are minimized by re-quantizing using a dithering algorithm.
In addition, a selectively engaged noise-shaping function moves the noise energy up to frequency ranges less perceivable to the human ear. The noise reduction achieved in the range below 1 kHz is approximately 15 dB. Noise shaping is computed on the integrated signal processor on the basis of a 5th-order algorithm.

Sample-rate Converters

For handling asynchronous signals, sample-rate converters are optionally available for both the input and the output. If equipped with sample-rate converters, the board handles input signals with a sample rate of 32 to 50 kHz. In this case, the output sample rate can be set to either 44.1 kHz or 48 kHz. The board includes a quartz-controlled generator producing a 44.1-kHz or 48-kHz wordclock. Accuracy is better than 50 ppm.

Separate Synchronisation

The XTF also allows the output signal to be synchronised to the input signal independent of the system clock. Thanks to the sample-rate converters, the audio signal is still available on the NEXUS system.

Indicators

A front-panel LED indicates the status of the input signal.

Ports

The Tascam format uses 25-pole D-Sub ports. In addition, a BNC port is available for setting up the slave configuration of a connected unit. This port supplies a wordclock signal shifted by 90° (Tascam standard).

Versions

XTF version w / o SRC
XTF-SRC version w / SRC (inputs and outputs)

XTF01 Specifications

Data formats TDIF
Audio data 24, 20, 16 bits
Sample rates 44.1 KHz, 48 KHz
Features (per input)
phase inversion
±20 dB input gain
sample-rate converter (option) shared by all channels
Features (per output) noise shaping and dithering for 16/20-bit outputs signals
transparent transmission of all TDIF-format user bits (with SRC disabled)
sample-rate converter (option) shared by all channels
Indicators PLL status (front-panel LED)
Ports wordclock output BNC (TTL level)
data/audio: D-Sub (8 channels, 25-pole, female)
Propagation delay
4 samples (w / o SRC)
0.7 ms typ. when using SRC
Synchronisation to first channel

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