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RME HDSPe AIO [76/81] Ds double speed
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76
User's Guide HDSPe AIO © 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 HDSPe AIO displays 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 HDSPe AIO 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.
30.3 DS - Double Speed
When activating the Double Speed mode the HDSPe AIO 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 HDSPe AIO 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 HDSPe AIO provides 96 kHz as Single Wire only.
Содержание
- Dsp system hdspe aio 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
- Hdspe aio 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
- Hdspe aio 13
- User s guide 13
- Deinstalling the drivers 14
- Driver and firmware 14
- Driver installation 14
- Driver update 14
- Configuring the hdspe aio 15
- Firmware update 15
- Settings dialog 15
- Settings dialog dds 17
- Clock modes synchronisation 18
- Dvd playback ac 3 dts under mme 20
- Operation and usage 20
- Playback 20
- Notes on wdm 21
- Channel count under wdm 22
- Multi client operation 23
- Analog recording 24
- Digital recording 24
- Channel count under asio 25
- General 25
- Operation under asio 2 25
- Known problems 26
- Operation under gsif gigasampler interface 26
- Windows 2000 xp 26
- Digicheck 27
- Using more than one hdspe aio 27
- General 28
- Hotline troubleshooting 28
- Installation 29
- Driver installation and operation mac os x 31
- Hdspe aio 31
- User s guide 31
- Driver and flash update 32
- Driver installation 32
- Driver update 32
- Flash update 32
- Configuring the hdspe aio 33
- Settings dialog 33
- Settings dialog dds 34
- Clock modes synchronisation 35
- Mac os x faq 37
- Midi doesn t work 37
- Round about driver installation 37
- Channel count under coreaudio 38
- Repairing disk permissions 38
- Supported sample rates 38
- Hotline troubleshooting 39
- Various information 39
- Connections and totalmix 41
- Hdspe aio 41
- User s guide 41
- Analog connections 42
- Line inputs 42
- Headphones 43
- Line outputs 43
- Aes ebu 44
- Digital connections 44
- Overview 46
- Totalmix routing and monitoring 46
- The user interface 48
- Elements of a channel 49
- Tour de totalmix 49
- Mute und solo 51
- Submix view 51
- Presets 52
- The quick access panel 52
- Preferences 54
- The monitor panel 54
- Editing the names 55
- Hotkeys 56
- Menu options 57
- Level meter 58
- Elements of the matrix view 59
- Operation 59
- Overview 59
- Totalmix the matrix 59
- Advantages of the matrix 60
- Asio direct monitoring windows only 60
- Totalmix super features 60
- Copy routings to other channels 61
- Delete routings 61
- Selection and group based operation 61
- Recording a subgroup loopback 62
- Using external effects devices 63
- Ms processing 64
- Mapping 65
- Overview 65
- Totalmix midi remote control 65
- Operation 66
- Simple midi control 67
- Loopback detection 68
- Hdspe aio 69
- Technical reference 69
- User s guide 69
- Tech info 70
- Analog 71
- Technical specifications 71
- Digital inputs 72
- Digital outputs 72
- Digital 73
- Lock and synccheck 74
- Technical background 74
- Latency and monitoring 75
- Ds double speed 76
- Aes ebu spdif 77
- Qs quad speed 77
- Noise level in ds qs mode 78
- Steadyclock 78
- Block diagram hdspe aio 79
- Diagrams 79
- Connector pinouts 80
- Overview channels expansion boards 81
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