DA7211 datasheet(45/105 Pages) DIALOG

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DA7211

Ultra-low power stereo codec

Company confidential

Datasheet

Revision 3e

15-Oct-2015

CFR0011-120-00 Rev 5

45 of 105

8.6

Telephone/Bluetooth voice recording/playback at low sample rates

DA7211 offers a dedicated Voice Mode with configurable voice in-band and enhanced out-of-band

suppression for sample rates up to 16 kHz.

8.6.1

Voice filtering for recording at low sample rates

When the sampling frequency is 8, 11.025, 12 or 16 kHz, a Voice Mode can be enabled via

ADC_VOICE_EN (address 0xF, Table 51) where the low frequency roll off is configured using

control ADC_VOICE_F0 (address 0xF, Table 51).

Note 6

Voice filter setting takes precedence over the 5-band equaliser. If the voice filter is enabled for the

ADC path, the 5 band equaliser for recording is disabled.

Table 26: Voice mode recording high pass filter specifications

Cut-off frequency [Hz] at setting

Fs [kHz]

000

001

010

011

100

101

110

111

8.0

2.5

100

150

200

300

400

11.025

3.4

34.5

138

207

276

413

551

12.0

3.75

37.5

150

225

300

450

600

16.0

100

200

300

400

600

800

Figure 26: Voice mode recording high pass filter

(cut-

off frequency setting ‘000’ to ‘111’, 8 kHz)

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