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SM5841H データシート(PDF) 11 Page - Nippon Precision Circuits Inc

部品番号 SM5841H
部品情報  Audio Multi-function Digital Filter
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メーカー  NPC [Nippon Precision Circuits Inc]
ホームページ  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5841H データシート(HTML) 11 Page - Nippon Precision Circuits Inc

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SM5841H
NIPPON PRECISION CIRCUITS—11
FUNCTIONAL DESCRIPTION
The basic arithmetic block is shown in figure 1, and
the function of each block is described in the follow-
ing sections.
8-times Oversampling (Interpolation)
The interpolation arithmetic block is comprised of 3
cascaded, 2-times FIR interpolation filters, as shown
in figure 1.
The input signal is sampled at rate fs, and then 8-
times oversampling data is output. Sampling noise in
the 0.5465fs to 7.4535fs stopband is removed by the
interpolation filter.
Digital Deemphasis (DSF1, DSF2)
The digital deemphasis filter has the same construc-
tion as analog filters. It is implemented as an IIR fil-
ter to faithfully reproduce the gain and phase
characteristics of standard analog deemphasis filters.
The filter coefficients for fs = 32.0/44.1/48.0 kHz
sampling frequency are selected by DSF1 and DSF2
when the sampling frequency is specified, as shown
in the following table.
Figure 1. Arithmetic block diagram
Input
fs
13th - order
2
× interpolator
2fs
4fs
69th - order
2
× interpolator
8fs
fs
fs
fs
9th - order
2
× interpolator
Attenuator
Deemphasis IIR filter
1st FIR
3rd FIR
2nd FIR
Output
DSF1
DSF2
Deemphasis
Sampling frequency
LOW
LOW
On
44.1 kHz
LOW
HIGH
On
48.0 kHz
HIGH
LOW
Off
HIGH
HIGH
On
32.0 kHz


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