Layer 1 Structure

System Control

IBOC in the Time Domain

Audio Sampling Rate Implications

Frame and Block Duration

Diversity Delay

        AM Time Diversity

        FM Time Diversity

The Symbol

Sync-ing Up

System Control Processing

Differential Encoding

Universal Time

Service Modes

AM Service Modes

FM Service Modes

Backward Compatibility

From Logical to Physical

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Chapter 6: TABLES
6.1 Protocols Addressed in Chapter 6
6.2 IBOC Timing Structure
6.3 System Control Data on OFDM Reference Subcarriers
6.4 Reference Carrier System Control Data Bitmaps
6.5 Example of Differentially Encoded Sync Word
6.6 Hybrid AM IBOC OFDM Subcarrier Groups
6.7 All-Digital AM IBOC OFDM Subcarrier Groups
6.8 Primary FM IBOC OFDM Subcarrier Groups
6.9 Secondary FM IBOC OFDM Subcarrier Groups
6.10 Logical Channel Frame Rates and Robustness (most robust -1; least robust -11)
6.11 Backward Compatibility Default Service Modes for Reserved Expansion Service Modes

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Chapter 6: FIGURES
6.1 AM Layer 1 (From NRSC-5-A with permission)
6.2 FM Layer 1 (From NRSC-5-A with permission)
6.3 IBOC Frame, Block, and Symbol Structure
6.4 Information Flow on AM Logical Channel P1
6.5 Information Flow on FM All-Digtal Logical Channel P1

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