CHAPTER 20:Sound Mixer
508
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
3.10.
Sound Source Sampling Rate
3.10.1.
Input Sampling Rate
Sound source input/output sampling rates are shown in Table 3-7.
Table 3-7
Input or Output
Frequency
96
48
24
12
8
4
44.1
WFG0 to 4
-
Supported
-
-
-
-
-
PMIS0 to 4
Supported
Supported
Supported
Supported
Supported
Supported
Supported
Mixer output
-
Supported
-
-
-
-
-
3.10.2.
Sampling Rate Conversion and FIR Filter
The sound mixer uses saturation calculation to output a mixed sound source with a sampling rate of 48
kHz. When a sound source with a sampling rate that is not 48 kHz is input to PMIS0 to 4, the sound
mixer converts the sampling rate.
Conversion is by up-sampling, along with processing by an FIR filter to dampen high frequency noise
and prevent changes in sound quality. However, down-sampling is performed in the case of a 96 kHz
sampling rate, without filtering.
A list of filter processes for input sampling is shown below.
Table 3-8
Sampling Rate (kHz)
(Input Sound Source)
Sampling Rate Change
FIR Filter
Cut-Off Frequency (kHz)
96
Perform sound sampling.
-
48
Conversion not performed.
-
24
Perform up-sampling and FIR filter to prevent changes in sound quality.
11.0
12
5.0
8
3.0
4
1.2
44.1
17.0
Notes:
−
However, down-sampling is performed in the case of 96 kHz → 48 kHz, without filtering sampling
rate, without filtering, which creates the risk of aliasing. Sufficient evaluation with the actual
device is recommended.
−
Filter characteristics have been selected based on Cypress rules.
−
See 5.3 in detail.
Содержание S6J3200 Series
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