HA12155NT Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA12155NT

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

Hitachi -> Renesas Electronics 

HA12155NT/HA12157NT

MPX ON/OFF Switch

MPX-OFF mode means that signal from input amp doesn’t go through the MPX filter, but signal goes

through the SS circuit after being attenuated 3 dB by internal resistor. Refer to figure 5. For not cause any

level difference between MPX-ON mode and MPX-OFF mode, it is requested to use MPX-filter which has

definitely 3 dB attenuated. MPX-OFF mode offer totally flat frequency response and no bias-trap effect.

And when applying other usage except figure 5, take consideration to give bias voltage to NR-IN terminal

by resistor or so on because internal of NR-IN terminal hsa no bias resistor.

2.4 k Ω

IA OUT

MPX

5.6 k Ω

NR IN

VREF

Vref

INPUT amp

+

MPX ON

–

NR

PROCESSER

+

–

MPX OFF

3 dB ATT.

Vref

Figure 5 MPX ON/OFF Switch Block Diagram

Application as for the Dubbing Cassette Deck

HA12155NT/HA12157NT series has unprocessor signal from recording out terminals during plyaback

mode. So, it is simply applied for dubbing cassette decks.

And HA12155NT/HA12157NT has three input terminal. So, it is applicable to switch the signal from PB-

EQ as shown below.

Rev.4, Jun. 1997, page 19 of 57

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