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參數(shù)資料
| 型號： | SM5842AP |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | High-Class Audio Multi-function Digital Filter |
| 中文描述： | 高級音頻多功能數(shù)字濾波器 |
| 文件頁數(shù)： | 12/23頁 |
| 文件大?。?/td> | 201K |
| 代理商： | SM5842AP |
SM5842AP/APT
NIPPON PRECISION CIRCUITS—12
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
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 three sets of filter coefficients for the three fs =
32.0/44.1/48.0 kHz sampling frequencies are
selected by FSEL1 and FSEL2 when the sampling
frequency is specified, as shown in table 1. Indepen-
dent deemphasis for the left and right channel is con-
trolled independently by DEMPL and DEMPR,
respectively. Digital deemphasis is ON when
DEMPL/DEMPR is HIGH, and OFF when
DEMPL/DEMPR is LOW.
Figure 1. Arithmetic block diagram
Input
fs
2fs
2-times interpolator
2nd FIR, 29-tap
4fs
Deemphasis IIR filter
Deemphasis ON
4fs
Soft mute
4fs
8fs
Output
Deemphasis OFF
2-times interpolator
3rd FIR, 17-tap
2-times interpolator
1st FIR, 169-tap
Table 1. Sampling frequency select
FSEL1
FSEL2
Sampling frequency (fs)
LOW
LOW
44.1 kHz
LOW
HIGH
48 kHz
HIGH
LOW
Invalid setting
HIGH
HIGH
32 kHz
相關PDF資料 |
PDF描述 |
|---|---|
| SM5842APT | High-Class Audio Multi-function Digital Filter |
| SM5844 | Asynchronous Sample Rate Converter |
| SM5844AF | Asynchronous Sample Rate Converter |
| SM5847 | High-fidelity Digital Audio, Multi-function Digital Filter |
| SM5847AF | High-fidelity Digital Audio, Multi-function Digital Filter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SM5842APT | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:High-Class Audio Multi-function Digital Filter |
| SM5843A | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:Audio Multi-function Digital Filter |
| SM5843AP1 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:Audio Multi-function Digital Filter |
| SM5843AS1 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:Audio Multi-function Digital Filter |
| SM5844 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:Asynchronous Sample Rate Converter |
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