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encoder pulse qlcnntization (4.8.4. I).
&act-leak:= 1; maxadapt: =false;
adjust[l]: = I ; adjust[2]: = I. 0/0.625; adjust[3 1: = 1.0/0.3 75;
{3 bit ini~,ializarion}
adapt[4,0]: = 0.75; adapt[4, I]: =O. 875; adapt[4,2]:=0.875;
adapt[4,3]:= 0.875; adapt[4,4]: = I .O;
udapt[4,5]: = 1.25; adapt[4,6]:=1.5; adapt[4,71:=2.0;
inv-quant[4,0]:=0.1284; inv-qualzt[4,1]:=0.3881;
i11,v_quant[4,2=]:0 .6568;
inv_guant[4,3]: =0.9424; inv_quant[4,4]: = 1.256;
itzv-quant[4,5]: = 1.618; inv_quant[4,6]: =2.069;
inv_quant[4,7]: =2.733;
VAR I,qbits: in.teger
sgn : - I . . ] ;
FOR pulse:= I TO 3 DO
BEGIN
IF pulse<3 THEN BEGIN gbits:=4; qlevels:=7 END
ELSE BEGIN qbi fs: =3; qlevels: =3 END;
i:=O;
WMLE (abs(qanzp[pulse])>inv-qumlt[qbits,i]) and
(i<qlevels) DO i:=succ(i);
qamp[pi~lse]:=qamp[p~ilse]*~act-leak/adjust[pulse];
&act-leak:=EXP(O.Y8li:LN(gfact-leak));
IF i=qlevels THEN
BEGIN
IF nzaxadapt THEN gfact-leak: =&act-kak"
adapt[qbits,qlevels]; mmadapt:=true
END ELSE 1?7.axadapr:=false;
&acr_leak:=glract-leak*a~iap~[qbits,i];
IF gfuct-leak>512.0 THEN gfact-leak:=SI2.0 ELSE
fF gfac f-1eak<0.5 THEN &act-leak: =0.5
END;
5.1.3.3.1 If muting of the decoder output is indicated
(5.1.1 j, the contents of gamp[j shall be set to zero after the
completion of the above operation.
5.2 Generation of the decoded
speech output
For each decoded transmission frame, time-ordered speech
samples shall be generated by the following operations in
sequence;
Annex 110 - Aeronautical Telecommunications Volunze ZZZ
a) for each of the five vectors posns[] and gamp[]
associated with the current transmission frame, a
vector XI[] shall be generated by the operation defined
in 4.9.1;
b) for each of the five vectors sl[] associated with the
current transmission frame, and for the scalars qgain
and delay associated with the current transmission
frame, a vector s2[] shall be generated by the
operation defined in 4.9.2; and then
c) for each of the five vectors s2[1 associated with the
current transmission frame, and for the vector qtaps[]
associated with the current transmission frame, a
vector synthspch[l shall be generated by the operation
defined in 4.9.3.
Note.- The rate at which the vector synthspchC] is
generated by the decoder (5 vectors/frame at 50
frames/second) and the rare of speech sa17zples from each
synthspch[] (32 samples/vector) will yield an over-all speech
sample rate of 8.0 kHz.
5.3 Speech output transcoding
Each speech sample derived from the vector synrhspch[] will
exhibit the internal floating point numeric range as defined in
Section 2. The numeric range of the speech sample stream
should be appropriately scaled prior to any subsequent digital
transcoding 01- analog speech reconstruction.
Annex 10 - Aeronautical Telecommunicah'ons
Table A7-I. pardl[] (decision levels for the partial correlation
coefficient quantizer)
a d 1 I pardl 12
~ U ~ I JpIar~dlfJ ~:. b f
I.59 . p r i l 1.60 . pard1/l.61 ]. pArd1. 1.62/
Paniff I.63$, pard,fL-d. pnrdy2.0/. pardjlill
pard1(2.2]. pmdl 2,3], pardl 2.4 . pod1 2.5
ppaarrddli/fl 3.O,2]9. 1p,pa ardrdlf1 (43.1.310. Jp.a prda/r[d41.(23].3. 1p 1a.r dl(4. Jj 4 .- I ]
ppaorrddil//67..11/1.] ,p apradr,d/ l 5 61.11.51 p.a pradrlfd7/J/? -.pI ]a,r 47&.d4l$ 7.0
pardl/7.5], pardl(7.6 . pardl(7 9 . par r8.- I]
pardIl8,OI. pardI(B.1 j. pard118.2 I . pardll8.3I
pardl(d.4 pordl 8 5 pardl 8 6 pard1 8 7
pardl/9.- j j . porX/b b j. b.$. fprdr[b.$
pard1/9.3 . pardl 10.-1 . par I(1 .D pardll 0.
pardI/lO. d1, par l/10,3 j
Annex 10 - Aeronautical Telecornrnunications Volume ZZZ
Table A7-2. Line codes for partial correlation coefficient No. 1
QUANTIZER LINE
LEVEL CODE
QUANTIZER
LEVEL
Annex ZO - Aeronautical Telecommunications
Table A7-3. Line codes for partial correiation coefficient No. 2
QUANTIZER QU ANTIZER
Annex 10 - Aeronautical Telecommunications Volume 111
Table A7-4. Line codes for partial correlation coefficient No. 3
LINE
CODE
QUANTIZER
LEVEL
0.1390371
0.1874214
0.2353546
0.2827214
1 0.3294078
0.3753014
0.42029 18
0.4642707
0.5071322
0.5487733
0.5890937
0.6279963
0.6653876
0.70 1 1775
0.7352800
0.76761 29
LINE
CODE
Table A7-5. Line codes for partial correlation coefficient No. 4
QU ANTIZER LINE
LEVEL CODE
QUANTIZER LINE
LEVEL CODE
Part 1 Annex I0 - Aeronau$ical Telecommunications
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