Dolby Laboratories CP650 Installation Manual download pdf (Page 32)

Dolby

Model CP650 Installation Manual Installation

2-8

2.5.4 Analog Nonsync Sources

The CP650 has two sets of analog nonsync inputs, designated nonsync 1 (Format 60),

and nonsync 2 (Format 61). The input impedance is 11 kΩ. They both have a wide

range of input level adjustment, but to further extend the possible range of input

levels, the two sets of inputs have different gain adjustment ranges:

• The nonsync 1 input will accommodate input levels between approximately

0.2 and 4 V.

• The nonsync 2 input will accommodate input levels between approximately

0.06 and 1.5 V.

2.5.5 Digital Audio Sources

The CP650 can accept AES/EBU or S/PDIF digital audio bitstreams, generated by

digital audio sources including CD players, DAT recorders, DVD players, satellite

television receivers, HDTV receivers, or HD video players.

With the Cat. No. 790 board (included with the standard model CP650) installed, the

CP650 accepts up to four two-channel PCM (pulse code modulated) bitstreams. Each

bitstream contains the data for two channels of PCM audio. Sampling rates of up to

48 kHz—with up to 24-bit resolution—are accommodated. This bitstream format can

be found on the digital output connector of a CD player, DAT recorder, DVD player,

or any basic piece of digital audio equipment. The inputs are S/PDIF single-ended

signals. To use these inputs, a digital input format (Format 80, 81, 88, 89, or 90) may

be assigned to one of the user-definable format buttons U1, U2, or NS.

See Sections 7.8 and 7.9.

With the Cat. No. 794 board (included with earlier CP650s) installed, the CP650

accepts a digital audio bitstream. The Cat. No. 794 can accept either AES/EBU

differential signals or S/PDIF single-ended signals, depending on jumper settings on

the board itself (see Figure 2-7). To use this input, Format 80 (Master Digital In) must

be assigned to one of the user-defined format buttons U1, U2, or NS. See Sections 7.8

and 7.9.

With an optional Cat. No. 778 board installed, the CP650 gains the capability to

accept up to four two-channel digital audio bitstreams, and provides up to five digital

two-channel audio bitstream outputs. The CP650 can accept either PCM or Dolby

Digital bitstreams on its AES1 digital audio input. Additionally, the Cat. No. 778

allows the CP650 to accept up to four PCM-formatted AES/EBU inputs, giving a

total of eight discrete audio channels. The board provides five AES/EBU outputs to

support up to ten discrete audio channels. All inputs and outputs comply with

AES/EBU standards. The CP650’s main analog outputs are disabled with a Cat. No.

778 installed.

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Dolby Laboratories CP650 Installation Manual Page 32