Meridian Digital Audio Processor Meridian 518 Manuel d'utilisateur télécharger pdf (Page 43)

Appendix 1 – Noise Shapes 43

518 User Guide

Part 3

Appendix 1 – Noise Shapes

The graphs in this appendix show the relative noise spectra in dB for the

different shapers, compared with the flat-spectrum dither level for the

same word-size.

0Hz 5kHz 10kHz 15kHz 20kHz 25kHz

-20dB

0dB

20dB

Noise spectrum

Frequency

Above: noise spectrum using High-Pass additive TPDF dither at 44.1kHz

0Hz 5kHz 10kHz 15kHz 20kHz 25kHz

-15dB

-10dB

-5dB

0dB

5dB

10dB

Noise spectrum

Frequency

Above: noise spectrum for Shape A at 44.1kHz.

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MERIDIAN 518 USER MANUAL 1
Contents 2
Sales and service in the UK 4
Sales and service in the USA 4
Acknowledgements 4
Introduction 5
About this manual 5
About the 500 Series 5
Unpacking the 518 6
Installing your 518 6
Planning setup of 518 7
What's inside a 518? 7
Overview as Preamp (Type 0) 8
What about analogue sources? 9
What else do I need to know? 9
(Type 1) 10
Meridian Surround improvement 11
518 User Guide 12
Customising features 13
Starting off with 518 14
Basic operation of 518 14
Selecting a source 15
Adjusting the volume 15
0 0 0 0 0 0 0 0 16
16 data bits 16
18 data bits 16
Emphasis Light 18
Clip Display 18
Software version 18
Putting the 518 in Standby 18
Coming out of Standby 18
Muting the sound 19
Menu Keys 19
Volume control 19
Gain control 19
Operation summary 20
Customising 518, an overview 21
How to customise 518 22
Customising using Type 23
Customising using Config 24
Selecting the controller mode 25
Setting the Volume display 26
Setting up sources 27
Connections 29
Communications connections 30
Mastering Processor 31
Description 32
Making Recordings 34
Transfer to editor 35
Transfer to the final carrier 35
Noise shaper characteristics 36
518 Operating Background 37
Noise Shaping with dither 38
Dynamic Range 38
Pre and De-emphasis 38
Simple rules for using 518 39
Specification 40
• FM Radio, 13 bits 41
• Reel-reel tape, 13 bits 41
• Cassette tape, 12 bits 41
• LP, 11 bits 41
Cleaning 42
Maintenance & Service 42
Appendix 1 – Noise Shapes 43
Noise Spectrum 44
Frequency 44
Vulnerability of the signal 46
Appendix 3 – RS232 48
Jitter and de-jittering 49
• one bit noise reduction 53
Index 55 55
Index 56 56
Notes 57 57
Notes 58 58

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Meridian Digital Audio Processor Meridian 518 Manuel d'utilisateur Page 43

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