SI2704-A10 SILABS [Silicon Laboratories], SI2704-A10 Datasheet - Page 26

• Manufacturer Part Number: SI2704-A10
• Description: EMI MITIGATING 2.1X 5 W CLASS D AUDIO AMPLIFIER
• Manufacturer: SILABS [Silicon Laboratories]

Si2704/05/06/07-A10
4.6. Digital Audio Processing (DAP)
The Si270x implements programmable digital audio processing which features volume control, dynamic range
compressor (DRC), and audio filtering such as tone control, parametric equalization, crossover, and de-emphasis.
The three channel digital audio processing chain for the Si2707 is shown in Figure 20.
As outlined in "4.5. Digital Audio I2S Interface " on page 24, the crossbar mixer combines the selected audio
sources and outputs the corresponding Left and Right main channels and an Aux Channel containing any linear
combination of the inputs. The Aux Channel can either be disabled completely, configured as a mono low pass
subwoofer channel, or as a mono full bandwidth center channel according to system requirement.
To make all downstream audio processing independent of the input I
sample rate converter (ASRC) normalizes the input rate to 48 kHz.
Refer to the “AN469: Si270x Programming Guide” for more information on the complete range of programming
parameters and settings requested for operation of the digital audio processing features.
26
48.0 kHz
44.1kHz
32.0
48.0
Treble/Bass Shelving Filters
Figure 20. Signal Processing Chain
7 Bi-Quad Parametric EQ
HP Cross Over Filter
Asynchronous Sample Rate Converter
channel
Volume Balance
Left
Dynamic Range Compression
Input 1
L
I
ß
ß
2
L1
L2
S
DC Notch Filter
channel
Crossbar Mixer
Volume Master
De-Emphasis
Right
Rev. 0.6
Limiter
Input 2
R
I
ß
ß
2
R1
R2
S
Tone1
Tone2
Input 3
I
2
S
2 Bi-Quad EQ
Volume Aux
ß
ß
LP X-over
M 1
M 2
channel
L+R
2
Aux
2
S clock frequencies, an asynchronous