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CIRCUIT DESCRIPTION
REC OUT
Recording (Encode) output
LM IN
Level meter input
VRI
Volume input
LMD
Time constant pin for level meter
CNT
DAC output Volume control input
LM OUT
Level meter output
RPI
Recording input
EQ IN
Equalizer input
PBI
Playback input
EQ OUT
Equalizer output
INJ
| Injection current input for LL
FM
fQ
1A OUT
Input amplifier output
EQ parameter current
input
GH
Pp
p
GL
GP
HM
HC
HN
NRIN
Noise reduction processor input
VREF
Reference voltage buffer output
PB OUT
Playback (Decode) output
EQ parameter selector
Spectral skewing amplifier input
Spectral skewing amplifier output
Ground
Current controlled resistor output
rs
:
P
| 55 |
Digital (Logic) ground
Time constant pin for rectifier
Operating Mode Control
Electronic switches are used in the HA12157.
Noise
reduction ON/OFF, C/B, and Multiplex ON/OFF signals
controlled by parallel data (DC voltage) and a switch
controlled by serial data are provided in the operating
mode.
Control Using Parallel Data
Dolby noise reduction and multiplex filter are controlled
by the input signal at pins, @, and @.
NR-ON
C-NR
MPX-OFF
15
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