NJW1168 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJW1168

AUDIO PROCESSOR with Input Selector and Subwoofer Output

Japan Radio Corporation  

NJW1168

PRELIMINARY

s LPF Characteristics

GmAmp2

Secondary LPF

Buffer2

GmAmp3

Buffer3

Primary LPF

R1

24k

LF2

LF3

LF1

C2

C3

C1

The NJW1168 includes the LPF for subwoofer output and bass boost function. The LPF consists of primary and

secondary LPF and it is enable to adjust “cut off frequency”, “Q” and “Roll off”.

The expression of LPF characteristics is as follows.

<Primary LPF>

f c1

=

2π

1

* R *C1

=

2π

1

* 24*103

*C1

<Secondary LPF>

fc2

=

42.9 ∗10−6

2π C2 ∗C3

Q2 =1.46*

C3

C2

Q1 = 0.5

<LPF Frequency Response>

C2 = 47nF, C3 = 22nF

5

C1=15nF

0

C1=33nF

-5 C1=47nF

C1=68nF

C1=22nF

-10

C1 = 33nF, C3 = 22nF

5

C2=22nF

0

C2=47nF

-5

C2=68nF

C2=33nF

C2=100nF

-10

-15

-15

-20

-20

0.1

1

0.1

1

Frequency [kHz]

Frequency [kHz]

C1 = 33nF, C2 = 47nF

5

C3=47nF

0

C3=22nF

-5 C3=15nF

C3=10nF

C3=33nF

-10

-15

-20

0.1

1

Frequency [kHz]

-14-

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