TLV320AIC3105_08 BURR-BROWN [Burr-Brown Corporation], TLV320AIC3105_08 Datasheet - Page 34

• Manufacturer Part Number: TLV320AIC3105_08
• Description: LOW-POWER STEREO AUDIO CODEC FOR PORTABLE AUDIO/TELEPHONY
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

TLV320AIC3105
SLAS513A – FEBRUARY 2007 – REVISED JULY 2007
34
The digital processing also includes capability to implement 3-D processing algorithms by providing means to
process the mono mix of the stereo input, and then combine this with the individual channel signals for stereo
output playback. The architecture of this processing mode, and the programmable filters available for use in the
system, is shown in
level of 3-D effect introduced into the final stereo output. This combined with the fully programmable biquad
filters in the system enables the user to fully optimize the audio effects for a particular system and provide
extensive differentiation from other systems using the same device.
It is recommended that the digital effects filters should be disabled while the filter coefficients are being modified.
While new coefficients are being written to the device over the control port, it is possible that a filter using
partially updated coefficients may actually implement an unstable system and lead to oscillation or objectionable
audio output. By disabling the filters, changing the coefficients, and then re-enabling the filters, these types of
effects can be entirely avoided.
DIGITAL INTERPOLATION FILTER
The digital interpolation filter upsamples the output of the digital audio processing block by the required
oversampling ratio before data is provided to the digital delta-sigma modulator and analog reconstruction filter
stages. The filter provides a linear phase output with a group delay of 21/f
interpolation filtering is included to provide enhanced image filtering and reduce signal images caused by the
upsampling process that are below 20 kHz. For example, upsampling an 8-kHz signal produces signal images at
multiples of 8-kHz (i.e., 8 kHz, 16 kHz, 24 kHz, etc.). The images at 8 kHz and 16 kHz are below 20 kHz and still
audible to the listener; therefore, they must be filtered heavily to maintain a good quality output. The interpolation
filter is designed to maintain at least 65-dB rejection of images that land below 7.455 f
programmable interpolation capability, the f
range of 39 kHz to 53 kHz when the PLL is in use), and the actual f
example, if f
that all images of the 8-kHz data are sufficiently attenuated well beyond a 20-kHz audible frequency range.
R
L
Figure 25. Architecture of the Digital Audio Processing When 3-D Effects are Enabled
S
= 8 kHz is required, then f
Figure
N0 = N3
27619
+
+
–
Table 4. Default Digital Effects Processing Filter Coefficients,
25. Note that the programmable attenuation block provides a method of adjusting the
When in Independent Channel Processing Configuration
LB1
D1 = D4
32131
S(ref)
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S(ref)
can be set to 48 kHz, and the DAC f
Atten
should be programmed to a higher rate (restricted to be in the
Coefficients
N1 = N4
–27034
+
+
+
+
–
+
D2 = D5
S
–31506
is set using the NDAC divider. For
S
RB2
LB2
. In addition, programmable digital
S
To Left Channel
To Right Channel
set to f
S
. In order to utilize the
N2 = N5
26461
S(ref)
/6. This ensures
B0155-01
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