AN6291 データシートの表示（PDF） - Panasonic Corporation

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AN6291

ICs for Cassette, Cassette Deck / Dual dbx II Noise Reduction System ICs

Panasonic Corporation 

ICs for Cassette, Cassette Deck

s Effect of dbxII Noise Reduction System

(Without noise reduction system)

+20dB

0dB

Fortissimo

+10dB

Magnetron saturation level Distortes

+10dB

Recording

Playback

– 80dB

Pianissimo

– 60dB

– 60dB

Z-

Noise level

Noise

(When dbx II System is ON)

+20dB

0dB

FortissDimecorease

+10dB

Compressed to

1/2 by dB

Increase

Fortissimo

+20dB

Expanded to

2 times by dB

– 80dB

– 40dB

PianissiImncorease

Fortissimo is decreased less

than saturation level and

pianissimo is increased

more than noise level. Thus

they are recorded.

DNeocirsePeailsaeenv–iesls8i0mdoB

D range is expanded in equal

value as fortissimo is

increased and pianissimo is

decreased its level, and they

are playbacked.

Noise

AN6291, AN6291S

Fortissimo (large sound)

distortes due to magnetron

saturation

Even if input width is

100dB, width 60-70dB is

playbacked in output.

Pianissimo (small sound)

is erased by the hysnoise

of tape

Large sound is playbacked

without distortion

100dB of input range

is playbacked as well

Small sound is playbacked, too.

Noise level is decreased more

than by 30dB at the playback

mode (Improvement of S/N

ratio)

s Cautions

(1) When users use the AN6291 and the AN6291S, contract should be made between the dbx Technology Licensing. dbx

licence and trademark should be contacted with the following.

the U.S.A. : dbx Technology Licensing

JAPAN Office : dbx Technology Licensing

433 California Street, Third Floor

San Francisco, California 94104

Tel : 415-765-2801

Tel : 03-3378-0915

Fax : 03-3374-5191

Fax : 415-765-2141

(2) Capacitor between the Pin6 – 7 and Pin16 –17 is used to cut DC current.

When leakage of DC current is large, encode and decode characteristics is not right value, capacitor's leakage should be as

minimum as possible.

(3) The AN6291 is a low power consumption current type. So effection of wiring resistance is small and oscillation character-ist

of pattern location is good, however, when impedance of the input pin is high, wiring should be shorter because it is easily

effected by external noises.

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