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RME OCTAMIC XTC [55/62] Signal to noise ratio in ds qs operation
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User’s Guide OctaMic XTC © RME
55
22.7 Signal to Noise Ratio in DS- / QS-Operation
The outstanding signal to noise ratio of the OctaMic XTC's AD-converters can be verified even
without expensive test equipment, by using record level meters of various software. But when
activating the DS and QS mode, the displayed noise level will rise from -113 dBFS to -106
dBFS at 96 kHz, and –79 dBFS at 192 kHz. This is not a failure. The software measures the
noise of the whole frequency range, at 96 kHz from 0 Hz to 48 kHz (RMS unweighted), at 192
kHz from 0 Hz to 96 kHz.
When limiting the measurement range from 20 Hz to 20 kHz (so called audio bandpass) the
value would be -113 dB again. This can be verified with RME's DIGICheck. The function Bit
Statistic & Noise measures the noise floor by Limited Bandwidth, ignoring DC and ultrasound.
The reason for this behaviour is the noise shaping technology of the analog to digital convert-
ers. They move all noise and distortion to the in-audible higher frequency range, above 30 kHz.
That’s how they achieve their outstanding performance and sonic clarity. Therefore the noise is
slightly increased in the ultrasound area. High-frequent noise has a high energy. Add the quad-
rupled bandwidth, and a wideband measurement will show a significant drop in SNR, while the
human ear will notice absolutely no change in the audible noise floor.
As can be seen in the above picture, the noise floor stays fully unchanged up to 30 kHz. With
sample rates up to 96 kHz the noise shaping happens outside of the transmission range.
Содержание
- Autose 1
- Octamic xtc 1
- Professional mic line instrument preamp 8 channel microphone line ad converter 4 channel line phones da converter 8 channel analog to aes adat interface 64 channel madi interface adat aes madi format converter 24 bit 192 khz digital audio midi remote control usb 2 class compliant operation 1
- Quickgai 1
- Steadycloc 1
- User s guide 1
- General 2
- Inputs and outputs 2
- Usage and operation 2
- Class compliant mode 3
- Technical reference 3
- Important safety instructions 4
- General 5
- Octamic xtc 5
- User s guide 5
- Brief description and characteristics 6
- Introduction 6
- Package contents 6
- Controls connectors displays 7
- First usage quick start 7
- Accessories 9
- Quick start 9
- Appendix 10
- Warranty 10
- Ce fcc compliance 11
- Iso 9001 11
- Note on disposal 11
- Octamic xtc 13
- Usage and operation 13
- User s guide 13
- Encoders 14
- Front panel controls 14
- Select keys 14
- Menu keys 15
- Channel menu 16
- Setup menu 18
- Clock section 21
- Phantom power 22
- The input channel in detail 22
- Autoset 23
- Instrument 23
- Delay compensation 24
- Using multiple units with madi 24
- Compensation id 25
- Control via totalmix fx 26
- Midi over madi 26
- Remote control 26
- Inputs and outputs 27
- Octamic xtc 27
- User s guide 27
- Analog inputs outputs 28
- Instrument in 28
- Line in trs 28
- Mic line in xlr 28
- Phones line out 29
- Aes ebu 30
- Digital inputs and outputs 30
- Adat optical 31
- Word clock 34
- Word clock input and output 34
- Operation and technical background 35
- Cabling and termination 36
- Class compliant mode 37
- Octamic xtc 37
- User s guide 37
- General 38
- Operation 38
- System requirements 38
- Useful hints 39
- Class compliant mode under windows and mac os x 40
- Operation at the unit 41
- Supported inputs and outputs 41
- Octamic xtc 43
- Technical reference 43
- User s guide 43
- Analog 44
- Technical specifications 44
- Digital inputs 45
- Digital 46
- Digital outputs 46
- Firmware 47
- General 47
- Madi user bit chart 47
- Connector pinouts 48
- Technical background 50
- Terminology 50
- Lock and synccheck 51
- Latency and monitoring 52
- Ds double speed 53
- Qs quad speed 53
- Aes ebu spdif 54
- Signal to noise ratio in ds qs operation 55
- Madi basics 56
- Steadyclock 57
- Block diagram 58
- Basic sysex format 59
- Message types commands 59
- Midi implementation octamic xtc 59
- Parameters 60
- Table commands 60
- Details 61
- Level meter data 61
- 43 64db pdb value 65 22 43 64db pdb value 65 62
- 5 0db 6db pdb value 125 0 125 5 0db 6db pdb value 125 0 62
- 6 db 42db pdb value 107 0 94 3 6 db 42db pdb value 107 0 62
- Abbreviations 62
- Bit 1 mute bit 1 mute 0x02 62
- Bit 2 3 phase invert 0 off 1 both 2 left 3 right bit 2 3 phase invert 0 off 1 both 2 left 3 right 0x04 62
- Bit 4 level 0 low 1 high bit 4 level 0 low 1 high 0x08 62
- Level meter send only level meter send only 62
- Lsb channel 1 62
- Lsb source bit 0 0x01 62
- Msb bit 0 bit 7 source see value table 1 62
- Msb channel 2 62
- N a not assigned s d see details 62
- Phones settings 62
- Underflow 0 underflow 62
- Value 126 ovr 62
- Value table 1 phones sources 62
- Value table 2 digital routing sources 62
- Value table 3 midi sources 62
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