Components

• Input gain (±20 dB)
• Input-signal phase inversion
• Switchable noise shaping
  
• Output-signal re-quantization with dithering

The 8-channel I/O board features a D-Sub port compliant to the standard Yamaha multichannel pinout for convenient installation.

Noise Shaping and Dithering

The XYF board provides for re-quantization of 24-bit NEXUS data to 16-bit or 20-bit formats for external applications. Inaccuracies emerging from truncation errors and resulting in deterioration of the S/N-ratio and THD values are minimized by recalculating the bit resolution using a dithering algorithm.
In addition, the noise-shaping function is able to move 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 and around 10 dB in the critical range around 3 kHz. Noise shaping is computed on the integrated signal processor on the basis of a 5th-order algorithm.

Sample-rate Converters on Request

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 XYF also allows the output signal to be synchronised to the input signal of the board independently of the system clock. The sample-rate converters required for this configuration also make the signal available on the NEXUS audio network.

Ports

The Yamaha format uses RS 422-compliant differential signals. The galvanically isolated I/O signals are routed to a 25-pole D-Sub connector with Yamaha-compliant wiring. Thus, connections can be made with no need for adapters.

Indicators

The front panel of the board features an LED indicating the status of the received signal.