Filter
Top Products
1999 Apr 14 15
Philips Semiconductors Product specification
Audio processor with head amplifier for VHS hi-fi TDA9605H
Fig.9 Functional diagram of the envelope output circuit.
handbook, full pagewidth
MGR845
output select
hi-fi
output select
left channel audio:
right channel audio:
hi-fi
EOS • AFM
AF
envelope
FULL-WAVE
RECTIFIER
FULL-WAVE
RECTIFIER
PEAK HOLD
PEAK HOLD
1.3 or 1.4 MHz carrier
RESET
RESET
EOS • AFM
test
10
HF
envelope
SAMPLE-
AND-HOLD
RMHID
RM
HID
ENVOUT
SAMPLE-
AND-HOLD
SAMPLE
SAMPLE
HF LEVEL DETECTOR
1.7 or 1.8 MHz carrier
HF LEVEL DETECTOR
SQUARE ROOT
COMPRESSION
SQUARE ROOT
COMPRESSION
t
d
Fig.10 Timing diagram of the envelope output signal.
handbook, full pagewidth
MGR844
I
2
C-bus
registers
HID signal
HID period
ENVOUT
level meter
display
EOS = 0 or AFM = 1
EOS = 1 and
AFM = 0
0123
HF envelope
peak right
in period −1
peak right
in period 0
peak right
in period +1
peak right
in period +2
peak left
in period 0
left (period 0)
right (period 0)
tracking level
indication
peak left
in period 1
peak left
in period 2
peak left
in period +3
left (period 1)
right (period 1)
left (period 2)
right (period 2)