STAMP0 datasheet(16/62 Pages) STMICROELECTRONICS

Numer części	STAMP0

Szczegółowy opis	Microphone array processor with TDM output and recombination for wide dynamic range microphones

PDF	62 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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16 / 62 page

Architecture

STAMP0

16/62

DocID028639 Rev 1

4.2.1

Decimation filters

The STAMP0 provides a decimation section that is used to convert the sample rate from 64

x Fs to Fs.

The decimation is performed using three FIR filters (STAGE1, STAGE2 and STAGE3).

Each filtering stage has a decimation factor of 4, consequently both the number of TAPS

and coefficient values are different.

The total FIR frequency response (with respect to PDM frequency) is shown in Figure 6:

"Downsampling FIR frequency response (overall)" and the characteristics are listed in

Table 7: "Downsampling section overall characteristics".

Figure 6: Downsampling FIR frequency response (overall)

Table 7: Downsampling section overall characteristics

Symbol

Parameter

Min.

Typ.

Max.

Unit

PBW

Pass band relative to PDM sampling

frequency

0.00703125

SBW

Stop band relative to PDM sampling

frequency

0.078125

OOBA

Out of band attenuation

100

IBR

In band ripple

0.1

Total latency

562

PDM

samples

Obsolete

Product(s)

- Obsolete

Product(s)

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