digital audio interface for dra encoded audio bitstreams

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DIGITAL AUDIO INTERFACEFOR

DRA ENCODED AUDIO BITSTREAMS

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Contents

• Introduction of DRA and 100/1447/NP

• Industrialization progress of DRA technology

• Why we need an identifier of IEC 60958

• Details of IEC 61937 DIF for DRA

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Contents





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DRA （ Digital Rise Audio ） technology

An Audio compressing technology as China industry standardName of the Standard ：《 Specification for Multichannel Digital Audio Coding Technology 》Number of the Standard ： SJ/T11386-2006

Issued date ： Jan 4, 2007

Issued department ： Ministry of Information Industry of PRC (Now named as “MIIT”)

It will be published as China national standard at the end of this year

DRA Audio compressing technology can be used in:DAB (Digital Audio Broadcasting)

MMB (Mobile Multimedia Broadcasting),

NM (Network Multimedia),

DTV

DVD

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Technical specification and audio quality

• Formal listening test in China —— MOS score = 4.9/5.0

(July, 2007: by State Administration of Radio Film and Television)

• Also passed the BDA‘s audio quality assessments in Japan (Feb.17, 2008: Tokyo) and USA (April, 2008: Hollywood)

sampling rate 8~192kHz

bit rate 32~9612kpbs

sampling precision 24bit

channel numbers 64.3 —— normal channels: 64, low frequency channels (LFE):3

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Position for 100/1447/NP

partly

enlarged

Data-type

Value of

PC bit 0-4

Subdata-type

Value of

PC bit 5-6

Contents

1 0 AC-3 data

(assigned by IEC 61937-3)

7 0 MPEG-2 AAC


11 0 DTS Type I


14 0 ATRAC


Selected from 23-

26

0-3 DRA data

(apply for IEC 61937-x)

Copy from <IEC 61937-2: 2007>

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From BD

Blu-ray Disc Association (BDA) has accepted DRA audio coding technology as one part of BD Specification

"We are very happy that DRA, an original Chinese audio coding technology, has passed the BDA technical evaluation. The BDA is now taking final steps to formally adopt DRA as part of the format. “———

Matsumura-san （ Pioneer ） chair of BDA China Task Force

“DigiRise DRA (DRA) digital audio coding technology has passed an impor

tant technical evaluation” ——— Kawawuchi-san （ SONY ） CFO of BDA

"We will continue to work closely with BDA in order to complete the remaining procedures and ensure that DRA technology will be adopted by the Blu-

ray Disc format as soon as possible.“——— Songhe Yin vice president of China Hualu Group.

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From SMPTEMPEG available identifier for DRA

• TS format identifier (assigned by SMPTE) ：

0x44524131(“DRA1”) , used in PMT of MPEG-2 TS steam, 2008

• After that, BDA has added TS format identifier into BD draft Specification.

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CMMB project in China

• DRA : the mandatory technology in CMMB standard in China;• DRA hardware encoder for CMMB ：

• receiving terminal for CMMB ： DRA-CMMB receiver

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CMMB project

Other copartners in CMMB project

DRA-CMMB signals are broadcasting in more than 30 cities in China,2008

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DTV application in China

• DTV receiver specification: DRA —— audio part

• Broadcasting 5.1 channel DRA-DTV signal: Guangdong Province

• DRA-DTV chips providers signed agreement on chip design

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identifier for DRA in IEC 60958

• Lots of requirements for receiving and/or transmitting DRA through IEC 60958 interface

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If IEC 61937 DIF for DRA issued by TC100:More manufactures can develop chips or terminals supporting IEC 61937 DIF for DRAMore people can use and be familiar with IEC 61937 DIF for DRAIEC 61937 DIF will become more popular

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Position of DRA new proposal

IEC 60958-1Digital audio interface: General

IEC 60958-3

Consumer applications

IEC 61883-6

LPCM Audio

Non-LPCM audio

Data

A/M Protocol

IEC 60958 series conformant

professional applications

IEC 60958-4

General

IEC 61937-1

Burst-info

IEC 61937-2

RDI

IEC 62105/EN 50255

MPEG-1,-2 audioIEC 61937-4

DTSIEC 61937-5

MPEG-2 AACIEC 61937-6

ATRAC and ATRAC 2/3IEC 61937-7

AC-3IEC 61937-3

DRAIEC 61937-x

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Details of IEC 61937 DIF for DRA

Pa PdPb Pc Pa PdPb PcDRA

Burst_payloadDRA

Burst_payload

Bit 0 of Pa DRA frame stuffing

Regular rate of the DRA

Repetition period of the burst

DRA frame

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Details of IEC 61937 DIF for DRA

Bits of Pc

Value Contents Referencepoint R

Repetition period of data-burst in IEC 60958 frames

0-4 Data-type

23-26 DRA Depends on Subdata-type

5-6 Subdata-type

002 Subdata-type for DRA Bit 0 of Pa 1024

012 Subdata-type for DRA half-rate low sampling frequency

Bit 0 of Pa 2048

102 Subdata-type for DRA quarter-rate low sampling frequency

Bit 0 of Pa 4096

112 Reserved

7-15 In accordance with IEC 61937-1 and IEC 61937-2

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Thanks

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What we need IEC help us?

– Get the official number of Data-type

Pa PdPb Pc Pa PdPb PcDRA

Burst_payloadDRA

Burst_payload

Bit 0 of Pa DRA frame stuffing

Regular rate of the DRA

Repetition period of the burst

DRA frame

Bits 0-4 of Pc

digital audio interface for dra encoded audio bitstreams

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