參數(shù)資料
型號(hào)： AM79Q021JC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 編解碼器
英文描述： PCM CODEC, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 54/64頁(yè)
文件大?。?/td> 911K
代理商： AM79Q021JC
58
Am79Q02/021/031 Data Sheet
A-Law and
-Law Companding
Table 2 and Table 3 show the companding definitions used for A-law and
-law PCM encoding.
Table 2. A-Law: Positive Input Values
Notes:
1. 4096 normalized value units correspond to TMAX = 3.14 dBm0.
2. The character signals are obtained by inverting the even bits of the signals of column 6. Before this inversion, the character
signal corresponding to positive input values between two successive decision values numbered n and n+1 (see column 4)
is 128+n, expressed as a binary number.
3. The value at the decoder output is
, for n = 1,...127, 128.
4. x128 is a virtual decision value.
5. Bit 1 is a 0 for negative input values.
12
3
4
5
6
7
8
Segment
# Intervals
x Interval
Size
Value at
Segment
End Points
Decision
Value
Number n
Decision
Value xn
(See Note 1)
Character
Signal pre
Inversion of
Even Bits
Quantized
Value (at
Decoder
Output) yn
Decoder
Output
Value No.
Bit No.
Number
1 2 3 4 5 6 7 8
4096
(128)
(4096)
7
6
5
4
1 1 1 1 1 1 1 1
4032
128
3968
127
2048
1024
113
112
97
96
See Note 2
1 1 1 1 0 0 0 0
2176
2048
2112
113
See Note 2
1 1 1 0 0 0 0 0
1088
1024
1056
97
512
81
80
See Note 2
1 1 0 1 0 0 0 0
544
512
528
81
256
65
64
See Note 2
1 1 0 0 0 0 0 0
272
256
264
65
3
128
49
48
See Note 2
1 0 1 1 0 0 0 0
136
128
132
49
2
64
33
32
See Note 2
1 0 1 0 0 0 0 0
68
64
66
33
1
0
See Note 2
1 0 0 0 0 0 0 0
2
0
11
16 x 128
16 x 64
16 x 32
16 x 16
16 x 8
16 x 4
32 x 2
y
n
x
n1
–
x
n
+
2
-----------------------
=
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