AM79213 Legerity, AM79213 Datasheet - Page 42

• Manufacturer Part Number: AM79213
• Description: (AM79C203/031 / AM79213) PCM CODEC
• Manufacturer: Legerity

where:
In the ASLAC device, a coefficient, h
as C
x is the position of this CSD coefficient within the h
The next most significant binary 1 is represented by x = 2, and so on.
Thus, C
coefficient.
The number of CSD coefficients, N, is limited to 4 in the GR, GX, R, X, Z, and the IIR part of the B filter, and 3 for
the FIR part of the B filter. Note also that the GX-filter coefficient equation is slightly different from the other filters.
Please refer to the Am79213/Am79C203/031 Technical Reference, PID 21325A detailing the commands for complete
details on programming the coefficients.
42
xy
M
M
M
M
C
m
000:
001:
010:
011:
100:
101:
110:
111:
y
h
iGX
m
xy
1
2
3
4
xy
13
xy
= m
= m
= m
= m
m
, where C
=
13
1
1
1
1
1
is the sign bit (0 = positive, 1 = negative).
is the 3-bit shift code. It is encoded as a binary number as follows:
0 shifts
1 shifts
2 shifts
3 shifts
4 shifts
5 shifts
6 shifts
7 shifts
is the coefficient number (the i in h
+m
+m
+m
+
represents the sign and the relative shift position for the first (most significant) binary 1 in the 4th (h
h
2
2
2
i
+m
+m
xy
3
3
+m
is one bit (MSB) and m
4
i
, consists of N CSD coefficients, each being made up of 4 bits and formatted
Am79213/Am79C203/031 Data Sheet
xy
is 3 bits. Each CSD coefficient is broken down as follows:
i
).
B
B
B
B
i
1
2
3
4
coefficient. The most significant binary 1 is represented by x = 1.
= C
= C
= C
= C
1
1
1
1
• C
• C
• C
2
2
2
• C
• C
3
3
• C
4
Equation (7)
3
)