HA12179F Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA12179F

Audio Signal Processer for Car Deck and Cassette Deck (Dolby B-type NR with PB Amp)

Hitachi -> Renesas Electronics 

HA12179F

The Sensitivity Adjustment of Music Sensor

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

TAI (L)

×1

R28

R26

C28

4700P

MS

VREF

C14 VCC

R27 0.01µ

R25

R24

330k

+ C13

0.33µ

FFI NOI MA

OUT

MSI MS

DET

D VCC

IL

RL

L·R signal addition circuit

–6dB

+

–

26dB

LPF

25kHz

–

+

MS AMP.

MS OUT

DET

Microcomptuter

D GND

×1

TAI (R)

100k

D GND

Figure 5 Music Sensor Block Diagram

Gv1

Gv

[dB]

Gv2

f1

f2

Normal speed

f3

f4

FF or REV

10

100

1k

10k 25k 100k

f [Hz]

Figure 6 Frequency Responce

Rev.1, Apr. 1994, page 14 of 40

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