Datasheet

A/Doutput
Voiceinterface
SINCfilter
integrator
SINCfilter
differentiator
Low-pass
filter
High-pass
filter
Error
cancellation
032-043
VoiceUplink(TX)Filter8kHz
–10
–8
–6
–4
–2
0
2
0 100 200 300 400 500 600
Frequency(Hz)
1storderHPF
Specification
3rdorderHPF
Gain(dB)
032-044
TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
6.2.10 Digital Voice Filter Module
Figure 6-30 shows the digital voice filter uplink full path characteristics of the voice interface.
Figure 6-30. Digital Audio Filter Uplink Path Characteristics
The global HPF or only the third-order HPF can be bypassed (when the third-order HPF is skipped, the
first-order HPF remains active). It is controlled by the MISC_SET_2 VTX_3RD_HPF_BYP bit, address
0x49, the for the third-order HPF, and by the VTX_HPF_BYP bit for the global HPF.
6.2.10.1 Voice Uplink Filter (Sampling Frequency at 8 kHz)
Figure 6-31 and Figure 6-32 show the voice uplink frequency response with a sampling frequency of 8
kHz.
Figure 6-31. Voice Uplink Frequency Response With F
S
= 8 kHz (Frequency Range 0 to 600 Hz)
Copyright © 2008–2011, Texas Instruments Incorporated Audio/Voice Module 95
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