HA12155 データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12155

Audio Signal Processor for Cassette Deck (Dolby B/C-type NR with Recording System)

Hitachi -> Renesas Electronics 

HA12155NT/HA12157NT

Input Block Diagram and Level Diagram

RPI PBI

–3 dB

IA

MPX

NR

OUT

Filter

lN

PB - OUT

HA12155

580 mVrms

(–2.5 dBs)

43 mVrms

(–25.2 dBs)

VRI

47 mVrms

(–24.3 dBs)

Elect-

rical

VR

43 mVrms

(–25.2 dBs)

Input

Amp

426 mVrms 300 mVrms

(–5.2 dBs) (–8.2 dBs)

MPX ON

MA

MPX OFF

– 3 dB

HA12157

775 mVrms

(0 dBs)

NR

circuit

b) REC mode

The each level shown above is typical value when

offering Dolby level to test point pin (NR IN) with

the gain of electrical volume is under the condition

of max.

RPI PBI

IA

MPX

NR

OUT

Filter

lN

PB - OUT

HA12155

580 mVrms

(–2.5 dBs)

30 mVrms

(–28.2 dBs)

VRI

33 mVrms

(–27.4 dBs)

Elect-

rical

VR

30 mVrms

(–28.2 dBs)

Input

Amp

300 mVrms

(–8.2 dBs)

HA12157

775 mVrms

(0 dBs)

MA

NR

circuit

NR circuit

a) PB mode

The each level shown above is typical value when

offering Dolby level to test point pin (IA OUT) with

the gain of electrical volume is under the condition

of max.

Figure 4 Input Block Diagram

Rev.4, Jun. 1997, page 18 of 57

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