Iec 60958 4 2 2016

Part 4-2: Metadata an s bcode: sp cif ies the f ormat f or inf ormation, metadata, or s bcode tran mited with the au io data: prin ip l y the "c an el statu " but also u er data an the a

Digital audio int er ace –

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Digital audio int er ace –

CONTENTS

FOREWORD 4

INTRODUCTION 6

1 Sco e 7

2 Normative ref eren es 7

3 Terms, def i ition an a breviation 7

3.1 Terms an def i ition 7

3.2 Ab reviation

8 4 User data f ormat 8

5 Chan el statu f ormat 8

5.1 Chan el statu bit 8

5.2 Chan el statu bloc 8

5.3 Implementation 9

5.3.1 Implementation levels 9

5.3.2 Tran mit er req irement 9

5.3.3 Receiver req irement 9

5.4 Doc mentation 9

5.5 Chan el statu content 9

5.5.1 General 9

5.5.2 Byte 0: Basic au io p rameters 1

5.5.3 Byte 1: Chan el modes, u er bits management 12 5.5.4 Byte 2: Au i ary bits, word len th an al g ment level 12 5.5.5 Byte 3: Multic an el modes 13 5.5.6 Byte 4: DARS, hid en information, multiple- ate sampl n freq en ies 14 5.5.7 Byte 5: Reserved 15 5.5.8 Bytes 6 to 9: Alphan meric c an el origin 16 5.5.9 Bytes 10 to 13: Alphan meric c an el destination 16 5.5.10 Bytes 14 to 17: L cal sample ad res code 16 5.5.1 Bytes 18 to 21: Time-of-day sample ad res code 16 5.5.12 Byte 2 : Reserved 16 5.5.13 Byte 2 : Chan el statu data CRCC 17 5.6 Chan el statu when non-PCM au io is flag ed 17 6 Au i ary bits 17 6.1 Avai a i ty of au i ary bits 17 6.2 Use of au i ary bits 17 An ex A (informative) Chan el modes 18 An ex B (informative) Provision of ad itional, voice-q al ty c an els 19 An ex C (informative) Generation of CRCC (byte 2 ) for c an el statu 2

Bibl ogra h 2

Fig re 1 – Chan el statu data format 10 Fig re B.1 – Frame an bloc stru ture 19 Fig re C.1 – Flow diagram in lu in ex lu ive or gates 2

Ta le 1 – Non-PCM au io, protected statu bits 17

INTERNATIONAL ELECTROTECHNICAL COMMISSION

Part 4-2: Prof essional appl cations – Metadata and subcode

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

al n tio al ele trote h ic l c mmite s (IEC Natio al Commite s) Th o je t of IEC is to promote

intern tio al c -o eratio o al q e tio s c n ernin sta d rdiz tio in th ele tric l a d ele tro ic f i ld To

this e d a d in a ditio to oth r a tivitie , IEC p bls e Intern tio al Sta d rd , Te h ic l Sp cif i atio s,

Te h ic l Re orts, Pu lcly Av ia le Sp cific tio s (PAS) a d Guid s (h re fter refere to a “IEC

Pu lc tio (s)”) Th ir pre aratio is e tru te to te h ic l c mmite s; a y IEC Natio al Commite intere te

in th s bje t d alt with ma p rticip te in this pre aratory work Intern tio al g v rnme tal a d n

n-g v rnme tal org niz tio s laisin with th IEC als p rticip te in this pre aratio IEC c la orate clo ely

with th Intern tio al Org niz tio for Sta d rdiz tio (ISO) in a c rd n e with c n itio s d termin d b

a re me t b twe n th two org niz tio s

2) Th formal d cisio s or a re me ts of IEC o te h ic l maters e pre s, a n arly a p s ible, a intern tio al

c n e s s of o inio o th rele a t s bje ts sin e e c te h ic l c mmite h s re re e tatio f rom al

intere te IEC Natio al Commite s

3) IEC Pu lc tio s h v th form of re omme d tio s f or intern tio al u e a d are a c pte b IEC Natio al

Commite s in th t s n e Whie al re s n ble eforts are ma e to e s re th t th te h ic l c nte t of IEC

Pu lc tio s is a c rate, IEC c n ot b h ld re p n ible for th wa in whic th y are u e or f or a y

misinterpretatio b a y e d u er

4) In ord r to promote intern tio al u iformity, IEC Natio al Commite s u d rta e to a ply IEC Pu lc tio s

tra s are tly to th ma imum e te t p s ible in th ir n tio al a d re io al p blc tio s An div rg n e

b twe n a y IEC Pu lc tio a d th c r e p n in n tio al or re io al p blc tio s al b cle rly in ic te in

th later

5) IEC its lf d e n t pro id a y ate tatio of c nformity In e e d nt c rtific tio b die pro id c nformity

a s s me t s rvic s a d, in s me are s, a c s to IEC mark of c nformity IEC is n t re p n ible for a y

s rvic s c rie o t b in e e d nt c rtif i atio b die

6) Al u ers s o ld e s re th t th y h v th late t e itio of this p blc tio

7) No la i ty s al ata h to IEC or its dire tors, emplo e s, s rv nts or a e ts in lu in in ivid al e p rts a d

memb rs of its te h ic l c mmite s a d IEC Natio al Commite s for a y p rs n l injury, pro erty d ma e or

oth r d ma e of a y n ture wh ts e er, wh th r dire t or in ire t, or f or c sts (in lu in le al fe s) a d

e p n e arisin o t of th p blc tio , u e of, or rela c u o , this IEC Pu lc tio or a y oth r IEC

Pu lc tio s

8) Ate tio is drawn to th Normativ refere c s cite in this p blc tio Us of th refere c d p blc tio s is

in is e s ble for th c re t a plc tio of this p blc tio

9) Ate tio is drawn to th p s ibi ty th t s me of th eleme ts of this IEC Pu lc tio ma b th s bje t of

p te t rig ts IEC s al n t b h ld re p n ible f or id ntifyin a y or al s c p te t rig ts

International Stan ard IEC 6 9 8-4-2 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

This first edition, together with IEC 6 9 8-4-1 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 olowin 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;

b) s p ort f or a wider ran e of au io sampl n freq en ies;

c) de recation of “minimum implementation” of c an el statu data

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

Ful inf ormation on the votin for the a proval of this stan ard can b f ou d in the re ort on

votin in icated in the a ove ta le

A l st of al p rts in the IEC 6 9 8 series, publ s ed u der the general title Digital a dio

intera e, can b fou d on the IEC we site

This publcation 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 format 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 "valdity" f lag It also

sp cif ies the sampl n freq 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 mited 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 parameters: 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 for u e with

s ielded twisted-pair 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 f ibre-o tic ca le is u der con ideration

DIGITAL AUDIO INTERFACE –

Part 4-2: Prof essional appl cations – Metadata and subcode

This p rt of IEC 6 9 8 sp cif ies the f ormat for codin metadata, or s bcode, that relates to

the au io content an is car ied with it This p rt of IEC 6 9 8, together with IEC 6 9 8-1,

IEC 6 9 8-4-1, an IEC 6 9 8-4-4, sp cif ies an interface 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 miter to one receiver

The f olowin doc ments, in whole or in p rt, are normatively ref eren ed in this doc ment an

are in isp n a le f or 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

IEC 6 9 8-1:2 0 , Digital a dio intera e – P art 1: Ge eral

IEC 6 9 8-1:2 0 /AMD1:2 14

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

IEC 6 9 8-4-1, Digital a d io intera e – P art 4-1: P rofe sio al a plc tio s – Audio c nte t

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

ele tric l p rameters

ISO 6 6, I nformatio te h olo y – ISO 7 -bit c ded c ara ter s t for informatio interc a g

bits car yin , in a f i ed f ormat al g ed with the bloc , sp cif ied in IEC 6 9 8-1, inf ormation

as ociated with e c au io c an el whic is decoda le by an interface u er

_

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

Note 1 to e try: Th format of a s bfame is s e ifie in 4.1.1 of IEC 6 9 8- :2 0

3.2 Ab reviations

DARS Digital Au io Ref eren e Sig al

IRV International Ref eren e Version

4 User data f ormat

One bit of u er data may b car ied in e c s bf rame Dif f erent u er data may b car ied in

e c c an el an may b related to the as ociated au io or not Its ca acity in kbits is

theref ore eq al to the sampl n freq en y in u e, in ki osamples/s, f or e c c an el

User data bits may b u ed in an way desired by the u er

Known p s ible f ormats f or the u er data c an el are in icated by the c an el statu byte 1,

bits 4 to 7

Other p s ible f ormats may b u ed an may or may not b stan ardized in f uture

The default value of the u er data bit is logic 0

5.1 Ch nnel status bit

One bit of c an el statu data s al b car ied in e c s b-frame Dif ferent c an el statu

data may b car ied in e c c an el Their ca acity in kbit s is theref ore eq al to the

sampl n freq en y in u e, in ki osamples/s

NOT Th c a n l statu for e c a dio sig al c rie inf ormatio a s ciate with th t a dio sig al a d th s it

is p s ible for diff ere t c a n l statu d ta to b c rie in th two s bfame of th digital a dio sig al Ex mple

of informatio to b c rie in th c a n l statu are: le gth of a dio s mple word , n mb r of a dio c a n ls,

s mpln fe u n y, s mple a dre s c d , alp a umeric s urc a d d stin tio c d s, a d emp a is

5.2 Ch nnel status bloc

Chan el statu inf ormation s al b organized in 19 -bit bloc s, s bdivided into 8-bit bytes

n mb red f rom 0 to 2 The tran mis ion format s al mark every 19

n

f rame to s ow that it

car ies the first bit of a bloc Within e c byte, the bits are n mb red from 0 to 7, 0 b in the

f irst bit tran mited, so bit 0 of byte 0 is the first bit in the bloc Where a byte hold a

n merical value, bit 0 is the le st sig if i ant bit

NOT In IEC6 9 8- , th fame th t b gin with pre mble Z c ntain th first bit of a blo k in b th c a n ls In

oth r tra s orts (or e ample AE 10 a d IEC 6 3 5) a blo k start f l g is u e to mark th f irst s bfame in a blo k,

a d ma b a ple to e c c a n l in e e d ntly

5.3 Impleme tation

5.3.1 Impleme tation le els

The fol owin two implementation are def i ed: stan ard an en an ed These terms are

u ed to commu icate in a simple man er the level of implementation of the interface

tran miter in olvin the man features of c an el statu Ir esp ctive of the level of

implementation, al reserved states of bits defi ed in 5.5 s al remain u c an ed

5.3.1.2 Sta dard le el

The stan ard implementation provides a fun amental level of implementation whic s ould

prove s f f icient f or general a pl cation in profes ional au io or bro d astin In stan ard

implementation, tran miters s al cor ectly en ode an tran mit al c an el statu bits in

byte 0, byte 1, byte 2, an byte 2 (CRCC) in the man er sp cified in this stan ard

NOT This n te a ple to th Fre c la g a e o ly

5.3.1.3 En a c d le el

In ad ition to conformin to the req irements des rib d in 5.3.1.2 for the stan ard

implementation, the en an ed implementation s al provide f urther ca a i ties

5.3.2 Tra smit er re uireme t

Tran miters s al en ode c an el statu to f ol ow al the f ormat in an c an el codin rules

to one of the two sp cified implementation levels Al tran miters s al cor ectly en ode an

tran mit c an el statu with the cor ect ju ta osition with resp ct to the Z pre mble or bloc

start (se IEC 6 9 8-1)

5.3.3 Re eiv r re uireme t

Receivers s al decode c an el statu as req ired by their a pl cation Receivers s al

interpret CRCC er ors as ne din to reject the c an el statu bloc with the er or Receivers

s al not interpret an er ors in a c an el statu bloc s c as CRCC or bloc len th er ors

as a re son to mute or alter the au io content

The purp se of the CRCC in byte 2 is to in icate cor uption of the c an el statu bloc d e

to switc in or editin ef f ects (f or example) Due con ideration s ould b given to the

impl cation of an action on down tre m eq ipment an the as ociated s stem in general

interf ace tran mit ers an receivers

To promote comp tible o eration b twe n items of eq ipment bui t to this stan ard it is

neces ary to esta l s whic inf ormation bits an o erational bits s al b en oded an sent

by a tran mit er an decoded by an interf ace receiver

5.5 Cha nel status conte t

The sp cif i organization is presented in Fig re 1 Multiple-bit q antities are s own in the

ta les with the most sig if i ant bit to the lef t Note that the order in whic the bits are

5 4 6

(3 -bit bin ry)

Time-ofd y s mple a dre s c d

(3 -bit bin ry)

Rela i ty fla s

Cy lc re u d n y c e k c ara ter

IEC

5.5.2 Byte 0: Ba ic a dio parameters

Th sig if i a c of b te 0, bit 0 is s c th t a tra smis io fom a intera e c nformin to IEC 6 9 8-3

c n umer u e c n b id ntifie , a d a re eiv r c nformin o ly to IEC 6 9 8-3 c n umer u e wi c re tly

id ntify a tra smis io fom a profe sio al-u e interf ac a d fin d in this sta d rd Co n ctio of a

profe sio al-u e tra smiter with a c n umeru e re eiv r or vic v rs mig t re ult in u pre icta le

o eratio Th s, th folowin b te d finitio s o ly a ply wh n bit 0 = lo ic 1 (prof es io al u e of th

5 µs + 15 µs emp a is, s e ITU-R B 4 0.Re eiv r ma u l o erid is dis ble

1 1 1 ITU-T J.17 emp a is (with 6,5 dB in ertio lo s at 8 0 Hz) Re eiv r ma u l

o erid is dis ble

Al oth r state of bits 2 to4 are re erv d a d are n t to b u e u ti furth r d f i e

The fol owin con ideration f or b sic au io p rameters have to b taken into ac ou t

• The in ication that the au io sample word are not in l ne r PCM form req ires that the

val dity bit b set for that c an el Se 5.6 an IEC 6 9 8-4-1

• The in ication of sampl n f req en y, or the u e of one of the sampl n freq en ies that

can b in icated in this byte, is not a req irement f or o eration of the interface The 00

state of bits 6 to 7 may b u ed if the tran miter do s not s p ort the in ication of

sampl n f req en y, the sampl n freq en y is u k own, or the sample f req en y is not

one of those that can b in icated in this byte In the later case for some sampl n

f req en ies byte 4 may b u ed to in icate the cor ect value

• When byte 1, bits 1 to 3 in icate sin le c an el double sampl n f req en y mode then the

sampl n f req en y of the au io sig al is twice that in icated by bits 6 to 7 of byte 0

01 0 0 Sin le-c a n l mo e (mo o h nic) Ma u lo erid is dis ble

1 1 0 0 Primary-s c n ary mo e, s bfame 1 is primary Ma u l o erid is dis ble

00 1 0 Stere p o ic mo e, c a n l 1 is lef t c a n l Ma u l o erid is dis ble

1 0 1 0 Re erv d for u erd f i e a plc tio s

01 1 0 Re erv d for u erd f i e a plc tio s

1 1 1 1 Multic a n l mo e Ve tor to b te 3 for c a n l id ntif i atio

Al oth r state of bits 0 to 3 are re erv d a d are n t to b u e u ti furth r d f i e

state 00 0 0 Defa lt, n u er informatio is in ic te

1 0 0 0 19 -bit blo k stru ture withu er d fin d c nte t Blo k start alg e with c a n l

statu blo k start

01 0 0 Re erv d for th AE 18sta d rd

1 1 0 0 Us r d f i e

00 1 0 Us r d ta c nf orms to th g n ral u er d ta format d fin d in IEC 6 9 8-3

1 0 1 0 19 -bit blo k stru ture a s e ifie in AE 5 Blo k start alg e with c a n l

statu blo k start

01 1 0 Re erv d for IEC 6 5 7

Al oth r state of bits 4 to 7 are re erv d a d are n t to b u e u ti furth r d f i e

5.5.4 Byte 2: Auxi iary bits, word le gth a d al gnme t lev l

state 0 0 0 Ma imum a dio s mple word le gthis 2 bit (d fa lt) Us of a xi ary bits n t

d fin d

1 0 0 Ma imum a dio s mple word le gthis 2 bit Au i ary bits are u e for main a dio

s mple d ta

0 1 0 Ma imum a dio s mple word le gthis 2 bit Au i ary bits in this c a n lare u e

to c r y a sin le c ordin tio sig al

Th d fa lt state of bits 3 to 5 in ic te th t th n mb r of a tiv bits within th 2 -bit or 2 -bit c din ra g

is n t s e if i d b th tra smiter Th re eiv r s o ld d f ault to th ma imum n mb r of bits s e if i d b

th c din ra g a de a le ma u l o erid or a tomatic s t

b

Th n n efa lt state of bits 3 to 5 in ic te th n mb r of bits within th 2 -bit or 2 -bit c din ra g whic

mig t b a tiv This is als a in ire t e pre sio of th n mb r of LS s th t are c rtain to b in ctiv ,

v lu Th c a n l n mb r is th n meric v lu of th b te, plu o e, with bit 0 a th le stsig if i a t

bit

0 0 0 Multic a n l mo e 0 Th c a n l n mb r is d fin d b bits 3to 0 of this b te.

0 0 1 Multic a n l mo e 1 Th c a n l n mb r is d fin d b bits 3to 0 of this b te

0 1 0 Multic a n l mo e 2 Th c a n l n mb r is d fin d b bits 3to 0 of this b te

0 1 1 Multic a n l mo e 3 Th c a n l n mb r is d fin d b bits 3to 0 of this b te

1 1 1 Us rd f i e multic a n l mo e Th c a n l n mb r is d fin d b bits 3 to 0 of

this b te

Al oth r state of bits 6 to 4 are re erv d a d are n t to b u e u ti furth r d fin d

v lu Th c a n l n mb r is th n meric v lu of th s fo r bits,plu o e, with bit 0 a th le st

sig ific nt bit

The fol owin con ideration f or multic an el modes have to b taken into ac ou t

• The def i ed multic an el modes identif y ma pin s b twe n c an el n mb rs an f un tion

Some ma pin s may in olve groupin s of up to 3 c an els by combinin two modes

• For comp tibi ty with eq ipment that is only sen itive to the c an el statu data in one

s bframe the c an el car ied by s bframe 2 may in icate the same c an el n mb r as

c an el 1 In that case, it is impl cit that the secon c an el has a n mb r one hig er than

the c an el of s bframe 1 ex e t in sin le c an el double sampl n f req en y mode

5.5.6 Byte 4: DARS, hidde inf ormation, multiple-rate s mpl ng f re ue cie

Bits 65 4 3 Samplng frequ n y

The fol owin con ideration f or a DARS have to b taken into ac ou t

• Bit 2 ref ers to inf ormation within the au io sample word, not to the au i ary bits

• When bit 2 is set to 1, proces in of the au io sig al (s c as ditherin , sample rate

con ersion an c an e in level) s ould b avoided A receiver may also u e this state as

a hint that it s ould lo k f or extra information (s c as MPEG s r ou d sou d, se

ISO/IEC 2 0 3-1) in the le st sig if i ant bits of the sig al

• The sampl n freq en y in icated in byte 4 is not de en ent on the c an el mode

in icated in byte 1

• The in ication of sampl n f req en y, or the u e of one of the sampl n freq en ies that

can b in icated in this byte, is not a req irement f or o eration of the interface The

0 0 state of bits 3 to 6 may b u ed if the tran miter do s not s p ort the in ication of

sampl n f req en y in this byte, the sampl n f req en y is u k own, or the sampl n

f req en y is not one of those that can b in icated in this byte In the later case for some

sampl n freq en ies byte 0 may b u ed to in icate the cor ect value

• The reserved states of bits 3 to 6 of byte 4 are inten ed f or later defi ition s c that bit 6

is set to def i e rates related to 4 ,1 kHz, ex e t f or state 10 0, an cle r to def i ed rates

related to 4 kHz They s ould not b u ed u ti further def i ed

5.5.7 Byte 5: Re erv d

v lu Set to lo ic 0u ti furth r d f i e

5.5.8 Byte 6 to 9: Alph numeric c a nel origin

v lu

(e c b te)

7-bit d ta with n p rity bit c mplyin with ISO 6 6, Intern tio al Refere c Versio (IR )

a

LS s are tra smite first with lo ic 0in bit 7

First c ara ter in me s g is b te 6

No printe c ntrol c ara ters, c d s 01

Defa lt v lu is lo ic 0 (c d 0

16)

a

ISO 6 6, IR , is c mmo ly id ntif i d a 7-bit ASCI

5.5.9 Byte 10 to 13: Alph numeric c a nel de tination

Defa lt v lu is lo ic 0 (c d 0

16)

Byte 14 is th le st-sig if i a t b te Defa lt v lu is lo ic 0

NOT This is inte d d to b s t to z ro at th start of th re ordin , for e ample, a d to h v th s me

fu ctio a a re ordin in e c u ter

5.5.1 Byte 18 to 21: Time-of -d y s mple a dre s code

v lu

(e c b te)

3 -bit bin ry v lu re re e tin first s mple of c r e t blo k

Byte 18 is th le st-sig if i a t b te Defa lt v lu is lo ic 0

NOT This is th time of d y laid d wn d rin th s urc e c din of th sig al a d remain u c a g d

d rin s b e u nt o eratio s A v lu of al z ro for th bin ry s mple a dre s c d is, f or tra s o in to re l

time, or to time c d s in p rtic lar, to b ta e a mid ig t (th t is, 0 h, 0 min, 0 s, 0 fame) Tra s o in

of th bin ry n mb r to a y c n e tio al time c d re uire a c rate s mple fe u n y inf ormatio to pro id a

s mple a c rate time

5.5.12 Byte 2 : Re erv d

Th bits in this b te are re erv d a d s t to lo ic 0 u ti furth r d fin d

NOT Byte 2 wa pre io sly s e ifie to c ry a s t of rela i ty fla s Th d finitio of rela i ty in this

c nte t wa c ntro ersial a d we are u awareof a y a plc tio th t e er u e th fe ture

+ x3

+ x2

+ 1

Th C C c n e s informatio to te t v ld re e tio of th e tire c a n lstatu d ta blo k

(b te 0 to 2 in lu iv ) For s rial impleme tatio s th initial c n itio of al o e s o ld b

u e in g n ratin th c e k bits with th LS tra smite f irst Th re is n d fa lt; this field

s al alwa s b c d d with a c r e t CR C Se 5.3.2 a d An e C

5.6 Ch nnel status whe non-PCM a dio is f la ge

When the state of byte 0 bits 0 an 1 are b th set to logic 1, the fol owin bits of c an el

statu may b implemented as f or l ne r PCM au io, that is, their interpretation may b

in e en ent of the state of byte 0 bit 1 The statu bits l sted in Ta le 1 s al not b u ed f or

an other purp se p n in f urther stan ardization

Table 1 – Non-PCM a dio, prote te statu bits

Annex A

(inf ormativ )

Channel modes

A f rame comprises two s bframes (se 5.5.3 an IEC 6 9 8-1:2 0 , 4.1.2) Ex e t where

otherwise sp cif ied the rate of tran mis ion of f rames cor esp n s exactly to the source

Two-c an el mode Chan el 1 is in s bframe 1, an c an el 2 is in s bf rame 2

Stere phonic mode The interface is u ed to tran mit stere phonic au io in whic the

two c an els are pres med to have b en simultane u ly sampled

The lef t, or A, c an el is in s bf rame 1, an the rig t, or B,

c an el is in s bframe 2

Sin le-c an el mode

(mono honic)

The tran mit ed bit rate remain at the normal two-c an el rate

an the au io sample word is placed in s bframe 1 Time slots 4

to 31 of s bf rame 2 either car y the bits identical to s bf rame 1 or

are set to logic 0 A receiver normal y def aults to c an el 1 u les

man al over ide is provided

Primary-secon ary mode In some a pl cation req irin two c an els where one of the

c an els is the main or primary c an el whi e the other is a

secon ary c an el, the primary c an el is in s bframe 1, an the

secon ary c an el is in s bframe 2

Sin le-c an el double

sampl n -f req en y

mode

The frame rate is half the au io sampl n freq en y Chan el 2 in

e c frame car ies the sample immediately fol owin the sample in

c an el 1 of the same frame

Annex B

(inf ormativ )

Provision of additional voice-qual ty channels

When a 2 -bit codin ran e is s f f icient f or the au io sig al, the 4 au i ary bits may b u ed

f or a voice-q al ty co rdination sig al ( alk b c ) This is sig aled in byte 2 bits 0, 1 an 2

(se 5.5.3)

The voice-q al ty sig al is sampled at exactly one-third of the sampln f req en y f or the main

au io, coded u if ormly with 12 bit p r sample re resented in 2's complement f orm It is sent 4

bit at a time in the au i ary bits of the interface s bframes One s c sig al may b sent in

s bframe 1 an another in s bframe 2 The bloc start in ication is u ed as a f rame al g ment

word f or the voice-q al ty sig als In the case of the tran mis ion f ormat sp cif ied in

IEC 6 9 8-1 the two s bframes of f rame 0 e c contain the 4 LSBs of a sample of their

resp ctive voice-q al ty sig al, as s own in Fig re B.1 Fig re B.1 also s ows two voi

Annex C

(inf ormativ )

The c an el statu bloc f ormat of 19 bit in lu es a c clc red n an y c ec code (CRCC)

oc upyin the last 8 bit of the bloc (byte 2 ) The sp cif i ation f or the code is given by the

generatin p ly omial:

G(x ) = x

8

+ x4

+ x3

+ x2

+ 1

An example of a hardware re l zation in the serial form is given in Fig re C.1 The initial

con ition of al stages is logic 1

Figure C.1 – Flow dia ram in luding e clusiv or gate

Two examples of c an el statu data an the res ltant CRCC folow

Al other bits in c an el statu bytes 0 to 2 in lu ive are set to logic 0

D

0

Example 2:

Al other bits in c an el statu bytes 0 to 2 in lu ive are set to logic 0

Bibl ography

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

IEC 6 3 5:2 0 , Digital a d io – Digital inp t-o tp t intera in – Tra smis io of d igital a dio

IEC 6 5 7, I ntera e for lo ds e k rs with d igital inp t sig als b s d o I EC 6 958

ISO/IEC 2 0 3-1, I nformatio te h olo y – MP EG a d io te h olo ie – P art 1: MP EG

International Telecommu ication Union, Geneva, Switzerlan

AES-2id, AES informatio doc me t for digital a d io e gin erin – Guid eli e for th u e of

th AES3 intera e, Au io En ine rin Society, New York, NY, USA

AES3-2, AES sta d ard for d igital a dio – Digital in ut o tp t intera in – Serial

tran mis io format for two-c a n l line rly-re re e ted d igital a dio data – P art 2: M etadata

a d Su c de, Au io En ine rin Society, New York, NY, USA

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

Society, New York, NY, USA

Multic a n l Audio Digital I ntera e (M ADI ), Au io En ine rin Society, New York, NY, USA

Sy c ro iz tio of d igital a dio e uipme t in studio o eratio s, Au io En ine rin Society,

New York, NY, USA

AES18-19 6 (r2 0 ), AES re omme ded pra tic for digital a d io e gin erin – Format for

th u er d ata c a n l of th AES digital a d io intera e, Au io En ine rin Society, New York,

NY, USA

AES4 -2 0 (r2 1 ), AES sta dard for d igital a dio – Digital in uto tp t intera in –

En ine rin Society, New York, NY, USA

identifiers into the AES3 tra s ort stre m, Au io En ine rin Society, New York, NY, USA

AES5 -2 12, AES sta dard for d igital a dio e gine rin – Cariag ofMP EG Suro nd in a

AES3 bitstre m, Au io En ine rin Society, New York, NY, USA

EBU Tec nical Recommen ation R6 -19 2, Alg me t le el in d igital a dio productio

e uipme t a d in d igital a d io re orders Euro e n Bro d astin Union, Geneva, Switzerlan

SMPT RP 15 :2 0 , M otio P icture a d Tele isio – Refere c le el for d igital a dio

s stems Society of Motion Picture an Television En ine rs, New York, NY, US

SMPT 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

SMPT 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

SMPT 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

SMPT 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

_ _ _ _ _ _

AVANT-PROPOS 2

INTRODUCTION 2

1 Domaine d’a pl cation 2

2 Réf éren es normatives 2

3 Termes, déf i ition et a réviation 2

5.3.2 Exigen e con ernant l émeteur 31

5.3.3 Exigen e relative au réce teur 31

5.4 Doc mentation 3

5.5 Conten de la voie de sig al sation 3

5.5.1 Général tés 3

5.5.2 Octet 0: Paramètres au io de b se 3

5.5.3 Octet 1: Modes de voie, gestion des bits uti sateur 3

5.5.4 Octet 2: Bits au i aires, lon ueur de mot et nive u d’al g ement 36

5.5.5 Octet 3: Modes multivoie 3

5.5.6 Octet 4: DARS, information cac é s, fréq en es d’éc anti on age à

dé its multiples 3

5.5.7 Octet 5: Réservé 39

5.5.8 Octets 6 à 9: Origine de la voie alphan mériq e 3

5.5.9 Octets 10 à 13: Don é s alphan mériq es s r la destination de la voie 3

5.5.10 Octets 14 à 17: Code d’adres e locale de l éc anti on 3

5.5.1 Octets 18 à 21: Code d’adres e de l éc anti on temp rel journal er 4

5.5.12 Octet 2 : Réservé 4

5.5.13 Octet 2 : Don é s de la voie de sig al sation CRCC 4

5.6 Voie de sig al sation lors ue d conten au io non MIC est marq é 4

6 Bits au i aires 41

6.1 Disp nibi té des bits au i aires 41

6.2 Uti sation des bits au i aires 41

An exe A (inf ormative) Modes de voie 4

An exe B (inf ormative) F urniture de voies s p lémentaires de q al té vocale 4

An exe C (inf ormative) Génération de CRCC (octet 2 ) p ur la voie de sig alsation 4