1. FM DIGITAL RADIO STANDARD Document Overview March 6, 2003 Release

2. 2 Documentation Structure FM Digital Radio Standard – Top level overview of system and documentation structure. Annex A, B, C – Overview of the three main components of the system: A: Audio Codec B: Protocol Stack C: Modem (Layer 1) iBiquity Reference Documents called out by Annexes

3. 3 Documents Submitted March 7, 2003 Standard Documents: –FM Digital Radio Standard – Rev B –Annex A: PAC Encoder/Decoder – Rev B –Annex B: Transport and Service Multiplex – Rev B –Annex C: RF Transmission System – Rev B Reference Documents: –Layer 1 FM: 1011s Rev C - which includes incorporated changes –Layer 2 Channel Multiplex Rev B –Transmission System Rev B

4. 4 IBOC Digital Radio Broadcasting Model

5. 5 HD Radio Broadcast System

6. 6 The Standard - Rev B Change Summary Referenced Documents added Acronyms separated from terms employed Updated broadcasting model figure showing relationships between Annexes and subsystems

7. Annex A PAC Encoder/Decoder Characteristics Rev B

8. 8 Block diagram of the basic Perceptual Audio Coder (PAC)

9. 9 FM Hybrid Audio Specifications Encoded Audio Bitrate, kbit/s Decoder Info. Rate – Enhanced, kbit/s Reference Audio Specifications Minimum Audio Frequency Response (Hz) Dynamic Range (dB) Minimum Stereo Separation (dB) Quality LevelFM Service Mode 969820 to 200009670Virtual CDMP1-MP4

10. 10 Block diagram of Single Stream PAC encoder for Hybrid FM System

11. 11 FM All Digital Audio Performance at Various Specified Bit Rates Encoded Audio Bitrate Core / Enhanced, kbit/s Decoder Info. Rate – Core, kbit/s Decoder Info. Rate – Enhanced, kbit/s Reference Audio Specifications Minimum Audio Frequency Response (Hz) Dynamic Range (dB) Minimum Stereo Separation (dB) Quality LevelFM Service Modes 24 / 722574 20 to 200009670 Virtual CDMP5 48 / 485049 20 to 200009670 Virtual CDMP6 2425-20 to 800050NoneAM-likeMP5 4850-20 to 1000062NoneFM-monoMP6

12. 12 Block diagram of Two-Stream classifier PAC encoder for All-Digital FM System

13. 13 Block diagram of PAC Decoder

14. 14 Annex A - Rev B Change Summary List of figures and tables added Referenced documents added Acronyms added HD Radio Broadcast System Diagram added showing functional system description Audio specification tables clarified

15. Annex B Transport and Service Multiplex Characteristics Rev B

16. 16 IBOC Digital Radio Broadcasting Model

17. 17 HD Radio Broadcast System

18. 18 MPA Codec Protocol Interface Diagram

19. 19 Annex B - Rev B Change Summary References added Acronyms updated Reorganized overview section – clearer description More detailed broadcast system diagram (identical to Annex A and C) Service description broken down to follow diagram Updated MPA protocol diagram

20. Annex C RF/Transmission System Characteristics Rev B

21. 21 IBOC Digital Radio Broadcasting Model

22. 22 Figure 1 ‑ 1 HD Radio Broadcast System

23. 23 RF/Transmission Function

24. 24 FM Air Interface Layer 1 Functional Block Diagram with data flow details

25. 25 Interleaving Conceptual Block Diagram

26. 26 System Control Processing Conceptual Diagram

27. 27 OFDM Subcarrier Mapping Conceptual Block Diagram

28. 28 Hybrid/Extended Hybrid Transmission Subsystem Functional Block Diagram

29. 29 Annex C - Rev B Change Summary Reference documents added Acronym list updated Broadcast system diagram added (same as Annex A and B) Layer 1 SAP typo fixed

30. SY_IDD_1014s Air Interface Design Description – Layer 2 Channel Multiplex Protocol Rev B

31. 31 HD Radio Broadcast System

32. 32 Level 2 Channel Multiplex Protocol Interface Diagram

33. 33 Layer 2 PDU Structure

34. 34 MPA and AAS Transfer Frame Structure

35. 35 1014s - Rev B Change Summary Removed copyrights section Embellished document overview section Added reference documents Updated acronym list Added layer 2 channel multiplexing Section Fixed numbering issues

36. SY_IDD_1026s Transmission System Specifications Rev B

37. 37 HD Radio FM Hybrid Mode Noise and Spurious Emission Limits

38. 38 HD Radio FM All-Digital Mode Noise and Spurious Emission Limits

39. 39 1026s - Rev B Change Summary Fixed proper revision lettering Added references Updated acronym list Removed mathematical operations table Added sections on frequency translators and on-channel boosters

40. SY_IDD_1011s Air Interface Design Description Layer 1 FM Rev C

41. 41 1011s Rev C Overview Only minor changes made, therefore revision “D” not generated – new Revision C dated March 6, 2003 6 DCRs generated from: –NRSC questions and comments from meetings since September –Ongoing internal document process Changes listed in following slides

42. 42 1011s – Rev C Change Summary DCR 128 1.Page 4 -Change expansion for UTC to "Coordinated Universal Time“ (item #3 in attachment) 2.Need to add the definition for "Reference Subcarrier" to the Glossary (item #12 in attachment) 3.Page 24 Section 6.4 last sentence to be corrected as - ""...not part of the transmitted HD...""(item #16 in attachment)-delete the entire sentence 4.Table 6-7 last row contains ""l"" instead of ""1""-this needs to be corrected. (item #19 in attachment) 5.TOC need to corrected to correctly number the document-this has been corrected in the internal version needs to be fixed in the SY_IDD_1011s (item #1 in attachment) 6.Page 3 -correct the abbreviation for kilobits per second to ""kbit/sec""-this change has been completed in both the documents (item #2 in attachment) 7.Page 6 Note in italics that refers to Subsection 0, should be corrected to sections 3.5.-this has been corrected in both the documents. (item #4 in attachment)

43. 43 1011s – Rev C Change Summary DCR 129 1.Make appropriate changes in future generations of IBOC transmission hardware to allow leap second the data contained within the GPS signal to propagate to the receiver. (item #6 in the attachment). 2.Related to this DCR: Page 23, Section 6.4: ""The AFLN... is used to schedule delivery of time-critical programming."" Repeating the comment made in (13), above, the AFLN alone is not sufficient to determine the current time (e.g., U.S. Standard Time). The leap- second count is also required. Provision should be made to communicate this information up from Level 1 to Level 2.(item #18 in the attachment)

44. 44 1011s – Rev C Change Summary DCR 131 1.Page 21, Section 6.2.1, first line explains that all values greater than binary 000110 are reserved for future expansion, yet 000111 was assigned to MP7 which was identified as an active primary service mode. The backward compatibility defaults on the next page only map to MP6 (and not MP7). Please indicate whether 000111 is reserved or not and if not, then should MP7 be mapped as a default.(item #13 in attachment). 2.Related to above: Page 21, Table 6-4: There seems to be a conflict between this table and Table 4-1 on page 7. In Table 4- 1, both MP5 and MP7 show P3 at 25 kbit/s (kbits/sec). However, Table 6-4 shows MP5 as the default mode for MP7, with P3 ""free to be redefined."" Similarly, Tables 7-7 and 7-9 (page 29) seem to define P3 quite tightly in both MP5 and MP7. This MP7 has multiple contradictions. (item #14 in the attachment)

45. 45 1011s – Rev C Change Summary DCR132 Page. 23, 3rd and 4th line. Change MP7 to MP6 in both places. Only MP1 and MP6 don’t include the P3 logical channel. Also, include a reference to where long and short interleaver depth is defined. (item #15 in the attachment)

46. 46 1011s – Rev C Change Summary DCR 133 1.Page 28 Section 7.2.2-need to reconcile Table 7-2 with the middle paragraph above-change 2Tf to Tf for the L1Frame Pair in the Table 7-2.(item #22 in attachment) 2.Related to this DCR: Page 29 & 21 There is another conflict between Table 6-4 on page 21 and Tables 7-7 and 7-9 on page 29. In comparing MP7 to MP5, Table 6-4 says that P1' is backwards compatible and P1 may be redefined. However, Table 7-9 shows no P1' signal at all (e.g., no Tdd in P1 latency). This does not appear to be simply the omission of Tdd, since the Robustness drops from 1 to 4 also. Tables 7-7 through 7-9 depict no P’. (item #23 in the attachment)

47. 47 1011s – Rev C Change Summary DCR 144 Per the 12/4/02 NRSC review, several changes are recommended. See the attached questions. #3 - add words ""of the protocol stack"" to the definition of ""reserved"" in Tables 12-1 and 12-2. #6 - Page 40, add a phrase in front of last paragraph ""in cases where digital diversity delay is applied"" #6 - Figures 7-6, 7-7, 7-8, change P1 to P1' in the extended sidebands. #7 - Similarly, in Figures 7-10, 7-11, and 7-12, change S1 to S1' in the extended sidebands. Also, page 40, section 10.2, ""Transmit"" should not be capitalized in mid sentence. #11 - Page 41, section 10.3.1, add a definition of S. #14 - page 42, section 10.3.4 - replace ""That transfer frames define..."" with ""The fact that transfer frames define..."" #17 - Page 61, Table 11-12 - The second occurrence of variable B should be lower case. #21 - page 61 - delete the extra ""pt"" - note: This is pasted into word as an object that floats over the text. Make sure it does not belong some other place in the text. #22 - page 62 - Change text to ""readRow = INT(i / C)WriteRow= INT( (i MOD b) / C) "" #24 - Section 11.3.1.2 - delete the extra period at the end of the section. #25 - Change reference to ""Table 11-2 through Table 11-7"" #26 - delete ""="" from the subscript in 11.3.2.4 #29 - page 82 - change ""comprised"" to ""composed""