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RME HDSP 9632 [82/87] Ds double speed
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82
User's Guide HDSP System HDSP 9632 © RME
Therefore, in a digital loopback test a negative offset of about 2 ms occurs. This is no real
problem, because this way of working is more than seldom, and usually the offset can be com-
pensated manually within the application. Additionally, keep in mind that even when using the
digital I/Os usually at some place an AD- and DA-conversion is involved (no sound without DA-
conversion...).
Note
: Cubase and Nuendo display the latency values signalled from the driver separately for
record and playback. While with our digital cards these values equal exactly the buffer size (for
example 3 ms at 128 samples), the HDSP 9632 displays an additional millisecond – the time
needed for the AD/DA-conversion.
Core Audios Safety Offset
Under OS X, every audio interface has to use a so called satety offset, otherwise Core Audio
won't operate click-free. The HDSP 9632 uses a safety offset of 32 samples. This offset is sig-
nalled to the system, and the software can calculate and display the total latency of buffer size
plus AD/DA offset plus safety offset for the current sample rate.
33.3 DS - Double Speed
When activating the Double Speed mode the HDSP 9632 operates at double sample rate. The
internal clock 44.1 kHz turns to 88.2 kHz, 48 kHz to 96 kHz. The internal resolution is still 24 bit.
Sample rates above 48 kHz were not always taken for granted, and are still not widely used
because of the CD format (44.1 kHz) dominating everything. Before 1998 there were no re-
ceiver/transmitter circuits available that could receive or transmit more than 48 kHz. Therefore a
work-around was used: instead of two channels, one AES line only carries one channel, whose
odd and even samples are being distributed to the former left and right channels. By this, you
get the double amount of data, i. e. also double sample rate. Of course in order to transmit a
stereo signal two AES/EBU ports are necessary then.
This transmission mode is called Double Wire in the professional studio world, and is also
known as S/MUX (abbreviation for Sample Multiplexing) in connection with the ADAT format.
The AES3 specification uses the uncommon term Single channel double sampling frequency
mode.
Not before February 1998, Crystal shipped the first 'single wire' receiver/transmitters that could
also work with double sample rate. It was then possible to transmit two channels of 96 kHz data
via one AES/EBU port.
But Double Wire is still far from being dead. On one hand, there are still many devices which
can't handle more than 48 kHz, e. g. digital tape recorders. But also other common interfaces
like ADAT or TDIF are still using this technique.
Because the ADAT interface does not allow for sampling frequencies above 48 kHz (a limitation
of the interface hardware), the HDSP 9632 automatically uses the Sample Multiplexing method
in DS mode. One channel's data is distributed to two channels according to the following table:
ADAT Ch. 1 2 3 4 5 6 7 8
DS Channel
Samples
1
1a
1
1b
2
2a
2
2b
3
3a
3
3b
4
4a
4
4b
As the transmission of double rate signals is done at standard sample rate (Single Speed), the
ADAT outputs still deliver 44.1 kHz or 48 kHz.
The SPDIF (AES) output of the HDSP 9632 provides 96 kHz as Single Wire only.
Содержание
- Dsp system hdsp 9632 1
- Hammerfal 1
- User s guide 1
- Driver installation and operation windows 2
- General 2
- Connections and totalmix 3
- Driver installation and operation mac os x 3
- Technical reference 4
- General 5
- Hdsp 9632 5
- User s guide 5
- Brief description and characteristics 6
- Introduction 6
- Package contents 6
- System requirements 6
- External connectors 7
- Hardware connectors 7
- Hardware installation 7
- Internal connectors 8
- Accessories 9
- Warranty 9
- Appendix 10
- Ce fcc compliance 11
- Iso 9001 11
- Note on disposal 11
- Driver installation and operation windows 13
- Hdsp 9632 13
- User s guide 13
- Deinstalling the drivers 14
- Driver and firmware 14
- Driver installation 14
- Driver update 14
- Configuring the hdsp 9632 15
- Firmware update 15
- Settings dialog 15
- Settings dialog dds 18
- Clock modes synchronisation 19
- Operation and usage 21
- Playback 21
- Dvd playback ac 3 dts under mme 22
- Notes on wdm 23
- Multi client operation 24
- Digital recording 25
- Analog recording 26
- General 26
- Known problems 26
- Operation under asio 2 26
- Operation under gsif gigasampler interface 27
- Windows 2000 xp 27
- Digicheck 28
- Using more than one hammerfall dsp 28
- General 29
- Hotline troubleshooting 29
- Installation 30
- Channel routing asio at 96 khz 31
- Diagrams 31
- Channel routing wdm at 96 khz 32
- Driver installation and operation mac os x 33
- Hdsp 9632 33
- User s guide 33
- Driver and flash update 34
- Driver installation 34
- Driver update 34
- Flash update 34
- Configuring the hdsp 9632 35
- Settings dialog 35
- Settings dialog dds 37
- Clock modes synchronisation 38
- Mac os x faq 40
- Midi doesn t work 40
- Round about driver installation 40
- Pci card and pci slot compatibility 41
- Repairing disk permissions 41
- Supported sample rates 41
- Various information 41
- Hotline troubleshooting 42
- Diagram channel routing at 96 khz 43
- Connections and totalmix 45
- Hdsp 9632 45
- User s guide 45
- Analog connections 46
- Line inputs 46
- Headphones 47
- Line outputs 47
- Digital connections 48
- Word clock 50
- Word clock input and output optional word clock module 50
- Technical description and usage 51
- Cabling and termination 52
- Operation 52
- Overview 53
- Totalmix routing and monitoring 53
- The user interface 55
- Elements of a channel 56
- Tour de totalmix 56
- Mute und solo 58
- Submix view 58
- Presets 59
- The quick access panel 59
- Preferences 61
- The monitor panel 61
- Editing the names 62
- Hotkeys 63
- Menu options 64
- Level meter 65
- Elements of the matrix view 66
- Operation 66
- Overview 66
- Totalmix the matrix 66
- Advantages of the matrix 67
- Asio direct monitoring windows only 67
- Totalmix super features 67
- Copy routings to other channels 68
- Delete routings 68
- Selection and group based operation 68
- Recording a subgroup loopback 69
- Using external effects devices 70
- Mapping 71
- Overview 71
- Totalmix midi remote control 71
- Operation 72
- Simple midi control 73
- Loopback detection 74
- Hdsp 9632 75
- Technical reference 75
- User s guide 75
- Tech info 76
- Analog 77
- Technical specifications 77
- Digital inputs 78
- Digital outputs 78
- Digital 79
- Lock and synccheck 80
- Technical background 80
- Latency and monitoring 81
- Ds double speed 82
- Aes ebu spdif 83
- Qs quad speed 83
- Noise level in ds qs mode 84
- Steadyclock 84
- Block diagram hdsp 9632 85
- Diagrams 85
- Connector pinouts 86
- Overview channels expansion boards 87
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