HA12228F datasheet(11/49 Pages) RENESAS

Part #	HA12228F

Description	Audio Signal Processor for Car Deck (Decode only Dolby B-type NR* with PB Amp.)

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Manufacturer	RENESAS [Renesas Technology Corp]

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11 / 49 page

HA12228F/HA12229F

Rev.2.00 Jun 15, 2005 page 11 of 48

The Sensitivity Adjustment of Music Sensor

Adjusting MS Amp. gain by external resistor, the sensitivity of music sensor can set up. The music sensor block

diagram is shown in figure 4, and frequency response is shown in figure 5.

−

+

−

+

TAI(R)

TAI(L)

Note: The impedance of MSI is 100k

Ω.

C8

0.01

µF

C6

0.33

µF

R11

330k

Ω

MSOUT

REX2

CEX2

REX1

CEX1

MS

SER

MS

REP

MS

Amp.

×1

MS

DET

MA

OUT

MSI

100k

Ω

90k

Ω

+

LPF

DET

VCC

DVCC

L/R signal

addition

25kHz

20dB

−6dB

×1

+

GND

RL

IL

Micro

computer

Figure 4 Music Sensor Block Diagram

GV2

GV1

10

100k

25k

10k

1k

f3

f4

f2

f1

f (Hz)

100

Repeat mode

Search mode

Figure 5 Frequency Response

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