DCS 954 For, For, AES, AES, BNC, BNC, BNC, AES1, AES4, AES2, AES3, Filt, Filt, I-For, BNC In

dCS 954 User Manual	Manual for Standard Software Version 1.5x
dCS Ltd	June 2000

I-For

(Input Format). Sets the AES input multi-wire format Input Format. There are 4 options:

Auto	The message flags on the selected input are
	checked and the format is automatically set to
	Single, Dual or Quad AES. Dual AES must be
	connected to AES 1 & 2 or AES 3 & 4.
US[1]	User-selected Single AES mode.
US[2]	User-selected Dual AES mode.
US[4]	User selected Quad AES mode.

You can over-ride any setting using the AES1 – AES4 buttons.

In Dual or Quad AES modes, the unit will warn you of missing wires with a display like 1-34 (AES2 not connected for Quad AES). Swapped wires causes a display like 1243 (AES3 & 4 swapped). The checking relies on correct messaging and may not work with non-dCSequipment.

Filt

(Filter). Selects one of several anti-image3filter responses. The filters should be evaluated by ear. Filt1 gives the sharpest cut off, just below half the sampling frequency. This is the normal setting. Filt2, Filt3, Filt4 give progressively more relaxed responses, slightly degrading the Nyquist image performance but sharpening the impulse response. This affects the stereo or multi-channel image. Different filters may be appropriate for different material.

A typical audio signal contains very little signal energy above 10kHz, so there is some justification for relaxing the filter attenuation as 20kHz is approached.

DSD mode also has four filters. Metering DSD is difficult because the high level of ultrasonic noise can cause spurious meter readings. DSD Filt4 is specially designed for metering the 0 – 20kHz band and may not give the best sonic performance.

BNC I

(BNC Inputs). In PCM mode, this sets the format of the BNC In connectors.

SDIF	Configures Ch1, Ch2 and Clk In as an SDIF-2
	interface.
AES	Configures Clk In to accept AES3 encoded data at
	TTL levels at up to 96kS/s.

Select these inputs using the BNC button.

If the unit is already locked to SDIF or DSD, the AES option is disabled.

3Nyquist images, not stereo images. These are reflections of the pass-band spectrum about Fs/2 caused by any digital-to-analogue conversion process. They must be filtered out by the converter.

Manual part no: DOC136954 iss 2B1 Page 26 file 135954ma2b1.pdf available from website

Contact dCS on + 44 1799 531 999	email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0)	web site: www.dcsltd.co.uk