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7.2 Changing the Filter Response
Table 7.1: Example Sample-rate Converter Speci cations
Number
Sampling Rates
of
Input Output Passband Stopband
Channels
1
8,000
1
8,000
1
8,001
1
12,000
1
44,100
1
44,100
1
44,100
1
44,100
1
48,000
1
48,000
1
48,000
2
8,000
2
8,000
2
8,001
2
12,000
2
44,100
2
44,100
2
44,100
2
48,000
2
48,000
2
48,000
where irate is the input sampling rate
pgm is the program for which this default applies. As with all defaults multiple
components can be matched by a \*" character. Thus the line:
*filter*8000: 0@-90,200@-90,400@0,3400@0,3600@-90
indicates that this lter (which is similar to a telephone connection) should be used
whenever the output rate is 8000 samples per second.
Note that ltering is performed only if sample-rate conversion is necessary. If no
sample-rate conversion is required, the exact samples are passed between the host
computer and the digital audio device.
input to the sampling rate converter, not necessarily input to the
1
Critical Frequencies
(Hz)
(Hz)
44,100
3,882
4,000
48,000
3,874
4,000
48,000
3,874
4,000
48,000
5,705
6,000
8,000
3,690
4,000
10,000
4,597
5,000
48,000
15,422
22,050
48,000
19,050
22,050
8,000
3,752
4,000
44,100
16,148
22,050
44,100
19,785
22,050
44,100
3,689
4,000
48,000
3,640
4,000
48,000
3,685
4,000
48,000
5,279
6,000
8,000
3,378
4,000
10,000
4,124
5,000
48,000
11,209
22,050
8,000
3,488
4,000
44,100
3,010
22,050
44,100
13,274
22,050
, orate is the output sampling rate, and
1
73
Stopband Passband
Atten
Ripple
(dB)
(dB)
90.9
0.0004
88.2
0.0004
90.9
0.0003
87.5
0.0004
91.2
0.0004
91.4
0.0004
91.4
0.0005
49.9
0.0309
90.0
0.0003
94.4
0.0003
53.8
0.0375
90.0
0.0005
89.8
0.0004
90.0
0.0005
88.3
0.0004
93.8
0.0003
94.5
0.0004
57.4
0.0528
90.0
0.0002
93.0
0.0002
58.3
0.0298
DAT-Link
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