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IF c o u n t = n THEN BEGIN n : = n W 2 ;
count: =succ(count)END
END
hamming: =ham
END[of hamming.];
A sixth bit representing an odd-parity bit of the code word
shall be generated and appended to the code word as the most
significant bit. The resultant 6-bit valne shall be inserted in the
transmission frame and submitted to the burst error detection
logic defined in 4.10.3.2.
4.10.3.2 BURST ERROR DETECTION
The 26 protected bits defined in Table A7-18 and the 6-bit
value resulting from the Hamming code word defined in
4.10.3.1 shall be arranged in the order defined by the matrix
in Table A7-19 at the locations denoted by 'p' and 'e'
respectively.
Each bit 'b' shall be set to make even parity for its respective
column. The 8 'b' bits shall then be exclusive-ORed with the
binary mask '101 01 010' and the resulting 8 bits inserted in the
transmission frame.
5. DECODING PROCESS
DEFINITION
Each transmission frame shall be decoded as per 5.1. The line
codes shall be used to generate quantized speech samples as
per 5.2.
5.1 Transmission frame
decoding
5.1.1 PARTIAL CORRELATION
COEFFICIENT DECODING
5.1.1.1 BURST ERROR DETECTION/
CORRECTION
The 26 protected bits (Table A7-18), the 6-bit Hamming code
word. and the 8 burst errx detection bits shall be extracted
from the transmission frame and arranged in a burst error
detection calculation matrix as per Table A7-19. The burst
error detection bits shall then be exclusive-ORed in place with
the binary mask '10101010'. Each column of the resulting
matrix shall then be examined for a potential lack of even
parity. The matrix and the associated column parity error
information shall then be submitted to the error detection and
correction process defined in Figure A7-2. If that process
indicates that the corrected error level of the received
coefficient line codes is adequate, the coefficients shall be
decoded from the line codes as per 5.1.1.2. However, if the
corrected error level is inadequate, the line codes shall be
discarded and the output of the decoder shall be muted by the
logic defined in 5.1.3.2 and 5.1.3.2.1.
Note.- The purpose of the 8 burst error detection bits is
to guard against a pafhologi~acl ase where an. extremely long
burst error series mighz render '0' bits in all 40 positions of
the calculation nzarri-x. In that case, the exclusive-OR operation
on the 'h' hits oj'the matrix would cause odd parity to be
nzade in four of the colunins, thereby forcing the el-ror detection
and correction process to discard the trarzsmission.frame.
Part I Annex 10 - Aeronautical Telecommunications
5.1.1.2 COEFFICIENTD ECODING
If the corrected error level of the line codes corresponding to
the 10 coefficients is shown to be adequate (5.1.1 .I), the 10
coefficients shall be decoded as per Tables A7-2 through
A7-11 and the resulting values inserted into the vector
qppurcorl]. Vector qparcor[] shall then be used to generate
vector qtaps[J by the operation defined in 4.6.
5.1.2 LONG-TERMP REDICTOR
PARAMETER DECODING
The long-term predictor parameters qgain and delay shall be
decoded from the received line codes by the table look-up
operation defined by Tables A7-12 and A7-13 respectively.
5.1.3 EXCITATION PARAMETER DECODING
5.1.3.1 PULSE I'OSrr/ON DECODING
For each excitation frame, the vector posnsl] shall be
generated from the contents of the three pulse position values.
The contents shall be decoded from the received line codes by
the table look-up operation defined by Table A7-16.
For each excitation frame, the vector qamp[] shall be
generated from the contents of the three pulse amplitude
values contained jn the excitation frame. The contents shall be
decoded from the received line codes by the table look-up
operation defined by Tables A7-14 and A7-15.
5.1.3.2.1 If muting of the decoder output is indicated
(5.1 .I), the line codes corresponding to ga~np[la]n d qamnp[2]
shall be forced to '01 00' prior to decoding. Similarly, the line
code corresponding to qanzp[3] shall be forced to '0 10' prior
to decoding.
Note.- The contents of qamp[l], yamp[2] and qamp[3]
represent the alnplirudes ofthefirst through third pulses ofthe
excitation frame respectively
5.1.3.3 Beginning with excitation frame no. 1 and
continuing in sequence for each of the remaining excitation
frames, the contents of the vector qanzpl] co~~espondintgo
each of the five excitation frames shall be modified by the
operation defined by:
Note.- Tliis operation conzpensates for the antplitude
nonnalizatiun artd gain adjusbnelit processes pe@wmed durrng
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