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Automatic Loudness Control
the web interface. Internally the correction calculations are being performed
every audio frame.
Reset Statistics - This can be used to reset the statistics that have been
collected in the audio DSP. Due to the slower update nature of the web
interface the apparent change would be to the measurement of the Integrated
Loudness only.
F.3 The Audio Pipeline
Figure F.3 shows how the different components of ALC fit together in the audio
pipeline. The figure shows which user interface settings control each block.
Level
Control
Loudness
Measure
(EBU R128)
Loudness
Correction
Low Pass
Filter
Audio
Source
Audio
Output
LTLC module
Rate
Limiter
Peak Level
Limiter
Target Level
Peak Level
Manual
Gain
User Interface
Operating
Mode
ALC
Max Boost
Max Attn
+
-
+
+
Time Period
Correction
Clip Alarm
Gate
Level
Figure F.3 ALC Components
The pipeline takes, as its source, the raw audio input or output of the decode stage.
The output goes to actual encode library.
The (manual) Level Control stage is disabled when ALC is in operation. The
Loudness Measure block performs a standards-based (EBU R128) measurement
algorithm on the audio signal. The statistics collected here are then passed to the
LTLC module and the ALC module.
The LTLC module uses an over-damped feed-forward control loop.
The LTLC module and the ALC module both calculate the necessary corrections.
The rate limiter in the LTLC module prevents the adjustments from making large
gain/attenuation changes too quickly. The adjustment factors, due to LTLC and
ALC, are then combined and the Loudness Correction block takes in one adjustment
factor so that the audio is manipulated only once.
2/1553-
FGC 101 1400 Uen B
F-9
- SPR1100 Stream Processor 1
- Revision History 4
- Trademarks 4
- Warnings, Cautions and Notes 5
- EMC Compliance 5
- Contact Information 6
- 1 Introduction 9
- 1.1 Introduction 11
- Marketing Code Price Object 13
- Supply Object 13
- Description 13
- Introduction 15
- 1.3 Summary of Features 22
- MPEG-4 HD MPEG-4 HD 25
- MPEG-4 SD 25
- MPEG-4 SD different bit rate 25
- 1.3.2 Audio Processing 26
- 1.3.3 Data PIDs 28
- 1.3.4 Service Components 29
- 1.3.5 PID Processing 29
- 1.3.6 Table Processing 30
- 1.3.7 Transport Streams 30
- 1.3.8 Redundancy 30
- 1.3.9 SPR1100 and nCC 31
- 1.4 Front Panel 32
- 1.5 Base Units 33
- 1.6 Rear Panels 34
- 2 Installing the Equipment 37
- 2.1 Read This First! 39
- 2.2 Preliminary Checks 40
- 2.3.2 Ventilation 41
- Cautions! 42
- Warnings! 42
- 2.5 AC Supply Operation 43
- 2.5.2 AC Power Supply Cord 44
- 2.6 DC Power Operation 45
- 2.8 Signal Connections 48
- Installing the Equipment 49
- 3 Getting Started 51
- 3.1 Introduction 53
- Getting Started 55
- Services 62
- 3.17 How to Monitor Alarms 71
- 4 Front Panel Control 73
- 4.1 Introduction 75
- 4.2.3 LCD 76
- 4.3 Front Panel Menus 77
- 4.3.1 Top-Level Menu 78
- 4.3.2 System Menu 78
- 4.3.4 System > Alarms 79
- 4.3.5 System > Versions 80
- 4.3.6 System > HW Config 80
- Front Panel Control 81
- 5 Web GUI Control 83
- 5.1.1 Title Bar 88
- 5.1.4 About Button 88
- 5.1.5 Tabs 89
- 5.1.6 Navigation Path 89
- 5.1.8 Web Pages 90
- 5.1.10 Results Frame 91
- 5.2 Status 93
- 5.3 Alarms 95
- 5.3.2 Alarms > History 96
- 5.3.3 Alarms > Set Mask 96
- 5.4 Configure 98
- 5.4.3 Configure > System 99
- Web GUI Control 101
- 2/1553-FGC 101 1400 Uen B 101
- 5.5 Versions 163
- 5.5.2 Versions > Details 165
- 5.6 Support 167
- Chapter 6 171
- Contents 171
- 6.1.3 MPEG Layer 176
- 6.1.4 RTP Layer 176
- 6.1.5 UDP Layer 177
- 6.1.6 IP Layer 177
- 6.1.7 Ethernet Layer 177
- 6.1.8 IP Overhead 177
- 6.2.1 Overview 178
- 6.2.2 Services 180
- 6.2.4 Audio Output 182
- 6.2.5 Transport Packets 182
- 6.3 SPR1100 Redundancy 183
- 6.4 IP Interface Redundancy 184
- 6.4.3 Same Network Mode 186
- 6.5 Device Redundancy 188
- 6.6.1 System Architecture 192
- 6.6.2 Ethernet Interfaces 193
- 6.6.3 Multicast Routing 193
- 6.6.4 Forwarding Capacity 193
- 6.6.5 IGMP Snooping 193
- 6.6.7 MGP 194
- Port TCP/UDP Description 195
- 6.7 Temperature Monitoring 196
- 6.7.3 Fans 197
- 6.8.1 Real Time Clock 197
- 6.9.1 Supported Protocols 198
- 6.9.2 Operation 198
- 6.10 XPO 199
- 6.11 Clock & Timing 199
- Chapter 7 201
- 7.1 Introduction 203
- (SPR/HWO/MPM1) 203
- 7.2.1 Inputs and Outputs 204
- 7.2.2 Loss of Video Input 204
- 7.2.3 Output Bit Rate 204
- 7.2.5 Transport Packets 204
- Caution! 205
- Warning! 205
- 7.4 Obtaining New Licenses 209
- 7.6 Installing a Patch File 211
- Chapter 8 213
- 8.1 Introduction 215
- 8.2 Preventive Maintenance 215
- 8.3 Maintenance and Support 216
- 8.4 Alarms 217
- 8.5 Fault-finding 218
- 8.5.5 Cannot Access Web GUI 222
- 8.6 SNMP Traps 225
- 8.6.2 Using SNMP Traps 226
- 8.7 Viewing Log Files 227
- A Glossary 231
- B Technical Specification 251
- B.2.1 Overview 253
- B.2.2 IP Parameters 254
- B.2.3 MAC Address 254
- B.3.1 Overview 254
- B.3.2 Data Port Parameters 255
- B.3.3 IP Parameters 255
- B.3.4 MAC Address 255
- B.4.1 Overview 255
- B.4.2 Video Formats 256
- Item Specification 257
- B.5 Environmental 258
- B.6 Power Supply 259
- B.7 Compliance 260
- B.7.2 EMC 261
- B.7.3 Telecommunications 261
- B.7.4 CE Marking 261
- B.7.5 C-Tick Mark 262
- B.7.6 Packaging Statement 262
- B.7.7 Packaging Markings 262
- Technical Specification 263
- FGC 101 1400 Uen B 263
- B.7.9 Equipment Disposal 264
- B.7.10 Lithium Batteries 264
- B.7.11 Recycling 265
- C Audio Coding Standards 267
- C.1.1 MPEG 269
- C.1.2 MPEG-1 Layer I/II 269
- C.1.3 Dolby Digital 269
- C.1.5 Dolby E 270
- D Dolby Metadata Presets 271
- D.1 Dolby Metadata Presets 273
- Selected Option Description 274
- E Alarm Lists 275
- E.1 Alarms 277
- Operation Effect 278
- Annex F 289
- F.1 Overview 291
- F.1.2 Corrective Measures 292
- F.2 Operation 293
- F.2.2 Configuration 294
- Automatic Loudness Control 295
- F.3 The Audio Pipeline 297
- F.4 Standards Compliance 298
- F.4.4 Further Information 299
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