Iec 60958 4 1 2016

IEC 60958 4 1 Edition 1 0 201 6 03 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio interface – Part 4 1 Professional applications – Audio content Interface audionumérique – Partie 4 1 Applic[.]

Digit al audio int er ace –

Part 4- 1: Professional appl cat ions – A udio content

Partie 4- 1: Appl cat ions profe sionnel es – Cont enu audio

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Digit al audio int er ace –

Part 4- 1: Professional appl cat ions – A udio cont ent

Part ie 4- 1: A ppl cations professionnel es – Cont enu audio

FOREWORD 3

INTRODUCTION 5

1 Sco e 6

2 Normative ref eren es 6

3 Terms an def i ition 6

4 Au io content 7

4.1 Au io content codin 7

4.2 PCM p larity 7

4.3 Codin precision o tion 7

4.4 Intermediate codin precision 8

4.5 Non-au io content 8

4.6 DC content 8

5 Sampln freq en y 8

5.1 Chan el interde en en y 8

5.2 Choice of sampl n f req en y 8

6 Valdity bit 8

6.1 Chan el val dity u age 8

6.2 In e en ent c an el val dity 8

7 Pre-emphasis 8

7.1 Pre-emphasis c aracteristic 8

7.2 Pre-emphasis in ication 9

Biblogra h 10

INTERNATIONAL ELECTROTECHNICAL COMMISSION

Part 4-1: Prof essional appl cations – Audio content

1 Th Intern tio al Ele trote h ic l Commis io (IEC) is a worldwid org niz tio for sta d rdiz tio c mprisin

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International Stan ard IEC 6 9 8-4-1 has b en pre ared by tec nical are 4: Digital s stem

interf aces an protocols, of IEC tec nical commit e 10 : Au io, vide an multimedia

s stems an eq ipment

This first edition, together with IEC 6 9 8-4-2 an IEC 6 9 8-4-4, can els an re laces

IEC 6 9 8-4 publ s ed in 2 0 an its Amen ment 1:2 0 an con titutes a tec nical

revision

This edition in lu es the f ol owin sig if i ant tec nical c an es with resp ct to

IEC 6 9 8-4:2 0 with its Amen ment 1:2 0 :

a) s p ort f or a wider ran e of ph sical media;

The text of this stan ard is b sed on the fol owin doc ments:

This publ cation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

The commit e has decided that the contents of this publ cation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site u der "htp:/we store.iec.c " in the data

related to the sp cifi publ cation At this date, the publ cation wi b

• with rawn,

• re laced by a revised edition, or

The two-c an el digital au io interf ace has b en widely u ed in a variety of profes ional

au io a pl cation that have re c ed b yon the vision of the original stan ard In p rtic lar,

a pl cation u in in re sed sampl n freq en ies an alternative ph sical media

Se aratin the stan ard into in e en ently-maintaina le p rts al ows, f or example, ad itional

tran mis ion media to b introd ced in the f uture by revisin IEC 6 9 8-4-4 without af f ectin

the other p rts of the IEC 6 9 8-4 series The p rts comprise:

Part 4-1: Au io content: def i es the f ormat f or codin au io u ed for the au io content It

sp cif ies the semantic of the au io data, in lu in the val dity f lag It also

sp cif ies the sampl n f req en y by ref eren e to AES5

Part 4-2: Metadata an s bcode: sp cif ies the f ormat f or inf ormation, metadata, or s bcode

tran mit ed with the au io data: prin ip l y the c an el statu but also u er data

an the au i ary bits Implementors wi note that the c r ent implementation

o tion ("Stan ard" an "En an ed") b th req ire that statu data b

implemented cor ectly in compl ant eq ipment

Part 4-4: Ph sical an electrical p rameters: sp cif ies the ph sical sig als that con ey the

bit stre m sp cif ied in IEC 6 9 8-1 The tran p rt f ormat is inten ed f or u e with

s ielded twisted-p ir ca le of con entional desig over distan es of up to 10 m

at f rame rates of up to 5 kHz L n er ca le len th an hig er f rame rates may

b u ed, but with a ra idly in re sin req irement f or care in ca le selection an

p s ible receiver eq al zation, or the u e of active re e ters Provision is made in

this stan ard f or ada tin the b lan ed terminals to u e 7 Ω co xial ca le

Tran mis ion by fibre-o tic ca le is u der con ideration

DIGITAL AUDIO INTERFACE –

Part 4-1: Prof essional appl cations – Audio content

This p rt of IEC 6 9 8 sp cif ies the format for codin au io u ed for the au io content

Together with IEC 6 9 8-1, IEC 6 9 8-4-2, an IEC 6 9 8-4-4, it sp cifies an interf ace f or

serial digital tran mis ion of two c an els of p riodicaly sampled an l ne rly re resented

digital au io data from one tran mit er to one receiver

It is exp cted that the au io data wi have b en sampled at an of the sampl n freq en ies

recog ized by AES5 The ca a i ty of the interface to in icate other sample rates do s not

imply that it is recommen ed that eq ipment s p ort these rates To el minate doubt,

eq ipment sp cif i ation s ould defi e s p orted sampl n freq en ies

The f ol owin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an

are in isp n a le for its a pl cation For dated ref eren es, only the edition cited a pl es For

u dated ref eren es, the latest edition of the referen ed doc ment (in lu in an

amen ments) a pl es

IEC 6 9 8-1, Digital a dio intera e – P art 1: Ge eral

IEC 6 9 8-4-2, Digital a d io intera e – P art 4-2: P rofe sio al a p c tio s – Metadata a d

s b od e

IEC 6 9 8-4-4, Digital a d io intera e – P art 4-4: P rofe sion l a p c tio s – P hy ic l a d

ele tric l p rameters

VH F

ITU-T Recommen ation J.17, P re-emp a is u ed o s u d-pro ram circ its

AES5-2 0 (r2 13), AES re omme ded pra tice for profe sio al d igital a d io – P refered

s mp n fe u n ie for a plc tio s emplo in p ls -c de mod ulatio htp:/www.a s.org/

the four le st sig if i ant bits (LSBs) of those alocated to au io whic can b as ig ed as

au i ary sample bits an u ed for auxi ary inf ormation when the n mb r of au io sample bits

smal est stru tural element in a digital au io interf ace tran p rt stre m, car yin one PCM

sample an an i ary inf ormation

Positive analog e voltages at the ADC input s al b re resented by p sitive binary n mb rs

4.3 Codin pre ision o tions

The ac urac of the codin s al b b twe n 16 bit an 2 bit, in two ran es so as to in icate

whic len th is in u e in c an el statu data, 16 bit to 2 bit an 2 bit to 2 bit (se

IEC 6 9 8-4-2)

4.4 Interme iate coding pre ision

The interf ace p rmits maximum word len th of either 2 bit or 2 bit A source whic

provides f ewer bits than this s al b ju tif ied to the MSB of the avai a le word len th an the

u u ed LSBs s al b set to logic 0

NOT If a low-e olutio sig al were n t s ju tif i d, th n sig e te sio wo ldb n e e

4.5 Non-a dio conte t

The interface may alternatively car y data or au io whic is compres ed or in a dif ferent

f ormat in place of l ne r PCM au io, in either c an el B or b th c an els In s c cases the

val dity bit s al b set in e en ently in e c c an el an c an el statu en oded to in icate

The val dity bit s al b set to logic 0 if the as ociated au io sample word is s ita le f or direct

con ersion to an analog e au io sig al, an s al b set to logic 1 if it is not s ita le Where

c an el statu in icates (in byte 0 bit 1, se IEC 6 9 8-4-2) that the au io sample word is not

in l ne r PCM f orm, the val dity bit s al b set to logic 1 in every s bf rame

There is no default state f or the val dity bit

6.2 In epe de t c a nel v l dity

Valdity s al be set or reset f or e c an every sample in e en ently in e c c an el

7.1 Pre-empha is c ara teristic

The au io sig al may b coded with a f lat freq en y resp n e, or with 5 µs pre-emphasis as

p r ITU-R BS.4 0-3 or with J.17 pre-emphasis as p r ITU-T J.17

7.2 Pre-empha is indic tion

The u e of pre-emphasis s al b in icated in c an el statu as def i ed in IEC 6 9 8-4-2

Where no pre-emphasis is u ed, this may b in icated

NOT Po itiv in ic tio is stro gly prefere Th d fa lt v lu wi n rmaly b ta e to in ic te n

pre-emp a is, b t this c n itio is u d f i e Se AE -2id for clarif i atio

Bibl ography

IEC 6 9 8 (al p rts), Digital a dio intera e

IEC 6 9 8-3, Digital a d io intera e – P art 3: Co s mer a plicatio s

ITU-R BS.6 7, A digital a d io intera e for bro dca ting stud io

AES3-1, AES stand ard for d igital a dio – Digital in uto tp t intera in – Serial

tra smis io format for two-c a n l li e rly-re re e ted digital a dio d ata – P art 1: Aud io

Co te t, ht p:/ www.a s.org/

AES-2id, AES informatio do ume t for d igital a d io e gine rin – Guid eli e for the u e of

the AES3 intera e

EBU T3 5 :2 0 , Sp cific tion of the digital a dio intera e (th AES/EBU intera e), Third

Ed itio

SMPTE ST 3 7:2 0 , Format for N on-P CM Audio a d Data in a AES3 Serial Digital Audio

I ntera e Society of Motion Picture an Television En ine rs, White Plain , NY 10 01, US

SMPTE ST 3 8:2 10, Format for N on-P CM Audio a d Data in AES3 – Data Ty e Society

of Motion Picture an Television En ine rs, White Plain , NY 10 01, US

SMPTE ST 3 9:2 0 , Format for N on-P CM Audio a d Data in AES3 – Ge eric Data Ty e

Society of Motion Picture an Television En ine rs, White Plain , NY 10 01, US

SMPTE ST 3 0:2 0 , Format for N on-P CM Audio a d Data in AES3 – ATSC A/52B Digital

Audio Compre sio Standard for AC-3 a d En a c d AC-3 Data Ty e Society of Motion

Picture an Television En ine rs, White Plain , NY 10 01, US

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