Intel Fireface 800 manual DS Double Speed, QS Quad Speed, Analog DS Signal Port

Page 99

37.5 DS - Double Speed

When activating the Double Speed mode the Fireface 800 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 (Sample Multiplexing) in connection with the ADAT format.

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 Fireface 800 automatically uses Sample Multiplexing in DS mode. One channel's data is distributed to two channels according to the following table:

Analog In

1

2

3

4

5

6

7

8

DS Signal

1/2

3/4

5/6

7/8

1/2

3/4

5/6

7/8

Port

ADAT1

ADAT1

ADAT1

ADAT1

ADAT2

ADAT2

ADAT2

ADAT2

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.

37.6 QS – Quad Speed

Due to the small number of available devices that use sample rates up to 192 kHz, but even more due to a missing real world application (CD...), Quad Speed has had no broad success so far. An implementation of the ADAT format as double S/MUX results in only two channels per optical output. There are few devices using this method.

The Fireface 800 can not provide ADAT at 192 kHz, because this would equal a channel count of 64 (10+2+2+2 x 4, see chapter 37.4, Number of Channels and Bus load). The Fireface is internally limited to 48 channels.

The SPDIF (AES) output of the Fireface 800 provides 192 kHz as Single Wire only.

User's Guide Fireface 800 © RME

99

Page 98 Page 100
Image 99
Page 98 Page 100
Contents TotalMix Bit / 192 kHz SyncAlignZLMSyncCheck SteadyClock Most powerful FireWire audio interface everInstallation and Operation Windows Installation and Operation Mac OSGeneral Stand-Alone Operation, Connections and TotalMix Technical Reference Important Safety Instructions InstallationMains Users Guide Fireface 800 RME General System Requirements Package ContentsBrief Description and Characteristics IntroductionFirst Usage Quickstart Connectors and Front PanelAccessories Quick StartPart Number Description Warranty AppendixTrademarks Users Guide Fireface 800 RME CE / FCC Compliance RoHSISO Users Guide Fireface 800 RME Installation and Operation Windows Desktop Computer Hardware InstallationDriver Installation Driver and FirmwareDriver Update Deinstalling the DriversFirmware Update Settings dialog General Configuring the FirefaceLimit Bandwidth Phantom PowerBuffer Size InputsOptions Clock ModeWord Clock Out SyncCheckSettings dialog DDS Application examples Clock Modes SynchronizationLimit Bandwidth Available SettingsPlayback Operation and UsageDVD-Playback AC-3/DTS AC-3 / DTSMultichannel Low Latency under MME Buffer Size Adjustment Fireface Analog 1+2 MME Fireface Analog 1+2Multi-Client and Multi-Channel using WDM Multi-client OperationASIO-Multiclient Digital Recording Analog Recording Operation under AsioWindows 2000/XP Known ProblemsCommon Problems Operation under Gsif Gigasampler InterfaceUsing more than one Fireface DIGICheck 8 Adat channels don’t seem to work Hotline TroubleshootingInstallation Channel Routing Asio at 96 kHz DiagramsChannel Routing MME at 96 kHz Users Guide Fireface 800 RME Mac OS X Installation and Operation Driver Firmware Update Configuring the Fireface Level Out LevelAutoSync Ref Settings dialog DDS Clock Modes Synchronization Limit Bandwidth Mac OS X FAQ Round about Driver InstallationMidi doesnt work Various Information Repairing Disk PermissionsFireWire Compatibility Supported Sample RatesPossible causes for a Fireface not working Multicard OperationDiagram Channel Routing at 96 kHz Users Guide Fireface 800 RME Stand-Alone Operation, Connections and TotalMix Stand-alone Operation Reference DBFS @ Headroom Analog InputsLine Rear Microphone / Line FrontInstrument DriveSpeaker Emulation Headphones Analog OutputsLine Digital Connections AdatSpdif Midi Special Characteristics of the Spdif OutputOutput Word ClockWord Clock Input and Output InputTechnical Description and Usage Operation Cabling and TerminationOverview TotalMix Routing and MonitoringUsers Guide Fireface 800 RME User Interface Tour de TotalMix Elements of a ChannelUsers Guide Fireface 800 RME Mute and Solo Submix ViewPresets Quick Access PanelPreset Banks PresetPreferences Monitor PanelEditing the Names Main MonitorStereo Pan Law Hotkeys Menu Options Level Meter Elements of the Matrix View TotalMix The MatrixTotalMix Super-Features Advantages of the MatrixAsio Direct Monitoring Windows only Selection and Group-based Operation Copy Routings to other ChannelsDelete Routings Recording a Subgroup Loopback Using external Effects Devices Mixing several input signals into one record channelRecording a Softwares playback MS Processing Meaning in TotalMix Midi Remote ControlMapping ElementSetup Monitor Main 3E / 62 / D Preset 3 38 / 56 / #GPreset 5 3A / 58 / #A Simple Midi ControlLoopback Detection Stand-Alone Midi Control Mackie Control ProtocolMeaning in Fireface Simple Midi Control Element Meaning in FirefaceUsers Guide Fireface 800 RME Technical Reference Tech Info Analog Technical SpecificationsDigital DA, Line Out 1-8, rearDA Stereo Monitor Output Phones Adat Optical Digital InputsDigital Outputs Transfer Modes Resolution / Bits per Sample Windows onlyLock and SyncCheck Technical BackgroundSample frequency kHz 44.1 88.2 176.4 192 Latency and MonitoringHow much Zero is Zero? OversamplingFireWire Audio Safety BufferCore Audios Safety Offset Limit Bandwidth 48 kHz 96 kHz 192 kHz FW-Kanäle Number of Channels and Bus LoadAnalog DS Signal Port DS Double SpeedQS Quad Speed Type AES3-1992 IEC Byte Mode BitSteadyClock Noise level in DS / QS ModeBlock Diagram Fireface TRS Phones jack Connector PinoutsTRS jacks of analog input / output XLR jacks of analog inputs

Fireface 800 specifications

The Intel Fireface 800 is a powerful audio interface celebrated for its high-performance capabilities and versatility in both studio and live settings. Designed to cater to the needs of musicians, producers, and sound engineers, it stands out with its rich feature set and reliable technology.

One of the defining features of the Fireface 800 is its support for an impressive 26 input and 28 output channels. This extensive I/O configuration facilitates seamless integration with a wide variety of audio production setups, allowing users to record multiple instruments simultaneously or create complex routing scenarios. The unit also boasts top-notch analog and digital converters, ensuring pristine sound quality with a dynamic range that captures the nuances of any audio source.

In terms of connectivity, the Fireface 800 is equipped with both FireWire and USB ports, making it compatible with a range of computers and devices. The device utilizes the FireWire 800 protocol, which delivers higher data transfer rates compared to its predecessor. This efficient transfer capability is crucial for maintaining audio fidelity and reducing latency, making it an ideal choice for real-time monitoring and recording.

The Fireface 800 also features standalone operation capabilities, functioning independently of a computer when needed. This is particularly useful for live performances, where reliability and reduced setup complexity are essential. Users can easily connect microphones, instruments, and other equipment directly to the Fireface 800, making it a versatile tool for a variety of scenarios.

With its low-latency driver technology, the Fireface 800 ensures smooth performance even when handling demanding audio tasks. Its advanced ADAT and S/PDIF digital inputs and outputs provide further flexibility for connecting other gear, such as additional preamps and effects processors.

Another noteworthy characteristic of the Fireface 800 is its robust build quality. Designed for regular use in professional environments, the unit features a rugged metal chassis that can withstand the rigors of transport and daily use. This ensures longevity and consistent performance for audio professionals who depend on reliable equipment day in and day out.

In summary, the Intel Fireface 800 is a versatile and powerful audio interface that caters to a wide spectrum of audio production needs. With its extensive I/O capabilities, high-quality converters, reliable connectivity options, and robust design, it continues to be a popular choice among audio professionals striving for excellence in their work.
Top Page Image Contents