HA12134A Datasheet, PDF (16/27 Pages) Hitachi Semiconductor – Dolby B-Type Noise Reduction System

HA12134A, HA12135A, HA12136A
HA12135A
30
REC Out
NR–ON
20
PB–Out
NR–OFF
10
REC Out
NR–OFF
0
100
300 600 1 k
3 k 6 k 10 k
30 k 60 k 100 k 300 k 600 k 1 M
Frequency [Hz]
Figure 17 PB Mode Output Gain vs. Frequency
HA12135A
–10
–20
NR–ON
–30
NR–OFF
–40
–50
100 200 400
1k 2k 4k
Frequency [Hz]
10 k 20 k
Figure 18 REC Mode Ripple Rejection Ratio vs. Frequency
Rev.3, Jun. 1999, page 16 of 27