User guide

Si471x-EVB
20 Preliminary Rev. 0.4
14
Audio Level Indicators: Overmodulation, Audio input level below low-level threshold
(silence detection), and Audio input level below high-level threshold (loud detection). To
enable these three indicators please check off the Enable Interrupts box. These three
indicators are sticky bit, in order to clear these bits, press the Reset button.
—
15
Pre-Emphasis. Click one of the three buttons to set the pre-emphasis either to Off, 50 us
or 75 us.
Off, 50 us, 75 us
16
Si471x EVB audio input setting indicator: Analog In / Digital (Analog In to CODEC) / Dig-
ital (SPDIF)
Analog, Digital
CODEC, Digital
SPDIF
17
Turn on or off the compressor for the audio signal
On/Off
18
Attack time. Set the attack time for the compressor in millisecond
0.5–5 ms
19
Release time. Set the release time for the compressor in millisecond
100–1000 ms
20
Threshold. Set the threshold for the compressor
–40 to 0 dBFS
21
Input Gain. Set the compressor gain.
0 to 20 dB
22
Turn on or off the limiter feature
On/Off
23
Set the limiter release time constant
0.5,1,2,3,4,5,6,7,8,
9,10,20,30,40,50,
75,100 ms
Table 2. Control Bit Explanations (Continued)
# Explanation Range