TPS65950 datasheet(95/171 Pages) TI

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A/Doutput

Voiceinterface

SINCfilter

integrator

SINCfilter

differentiator

Low-pass

filter

High-pass

filter

Error

cancellation

032-043

VoiceUplink(TX)Filter8kHz

–10

–8

–6

–4

–2

100

200

300

400

500

600

Frequency(Hz)

1storderHPF

Specification

3rdorderHPF

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 FS = 8 kHz (Frequency Range 0 to 600 Hz)

Audio/Voice Module

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