RME HDSP 9652 [41/75] Word clock

User's Guide HDSP System HDSP 9652 © RME

Note that in record or monitor modes, set emphasis bits will disappear. Recordings origi-

nally done with emphasis should always be played back with the emphasis bit set!

This can be done by selecting the Emphasis switch in the Settings dialog (field SPDIF Out).

This setting is updated immediately, even during playback.

The HDSP 9652’s new output header is optimized for largest compatibility with other digital

devices:

• 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz depending on the current sample rate

• Audio use, Non-Audio

• No Copyright, Copy Permitted

• Format Consumer or Professional

• Category General, Generation not indicated

• 2-channel, No Emphasis or 50/15 µs

• Aux bits Audio Use

Professional AES/EBU equipment can be connected to the HDSP 9652 thanks to the trans-

former-balanced coaxial output, and the ‘Professional’ format option with doubled output volt-

age. Output cables should have the same pinout as those used for input (see above), but with a

male XLR plug instead of a female one.

Note that most consumer HiFi equipment (with optical or phono SPDIF inputs) will only ac-

cept signals in ‘Consumer’ format!

The audio bit in the header can be set to 'Non-Audio'. This is often necessary when Dolby AC-3

encoded data is sent to external decoders (surround-sound receivers, television sets etc. with

AC-3 digital inputs), as these decoders would otherwise not recognize the data as AC-3.

22.3 Word Clock

The HDSP 9652's word clock input is a high impedance type (not terminated). Termination with

75 Ohm is available via jumper X105 on the Expansion Board.

Thanks to a low impedance, but short circuit proof output, the HDSP 9652 delivers 4 Vpp to 75

Ohms. For wrong termination with 2 x 75 Ohms (37.5 Ohms), there are still 3.3 Vpp at the out-

put.

Selecting Single Speed in the Settings dialog causes the output signal to always stay within the

range of 32 kHz to 48 kHz. So at 96 kHz sample rate, the output word clock is 48 kHz.

22.4 MIDI

The HDSP 9652 offers two MIDI I/O via two 5-pin DIN connectors each. The MIDI ports are

added to the system by the driver. Using MIDI capable software, these ports can be accessed

under the name HDSP MIDI. Using more than one HDSP 9652, the operating system adds a

consecutive number to the port name, like HDSP MIDI In (3) etc.

The MIDI In port is available for both GSIF (GSIF-2 Low Latency) and standard MME MIDI si-

multaneously.