TEA0675T PHILIPS [NXP Semiconductors], TEA0675T Datasheet - Page 12

• Manufacturer Part Number: TEA0675T
• Description: Dual Dolby* B-type noise reduction circuit for playback applications
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Description of the principle timing diagram for AMS-scan mode with initial input signal (see Fig.6)
At t
at V
gets a steady state status.
Due to the signal at V
input V
by a limiter. This voltage causes the level detector output
charging the second time constant (time detector input V
1996 Jun 07
Dual Dolby* B-type noise reduction circuit
for playback applications
0
in
the AMS-scan mode is activated. With an input signal
, the following initial procedure runs until the circuit
I
(pin 3, CONTRA) slides to a value which is defined
handbook, full pagewidth
t r : rise time
t d : delay time
t b : burst time
t p : pause time
t f : fall time
to microprocessor
upper threshold
level threshold
time threshold
output signal
(hysteresis)
V AMSEQ
V REF
4.5 V
in
V in
V t
V l
the voltage at the level detector
AMS on
t 0 t 1
t 5 t 6
Fig.6 AMS-scan mode with initial input signal.
t d
t f
t 7 t 8 t 9 t 10
t b t r
t
)
12
t 11 t 12
to its maximum voltage level at t
procedure is completed.
The following behaviour does not differ from the
description in Section “Description of the principle timing
diagram for AMS-scan mode without initial input signal
(see Fig.5)”.
t 13 t 14
t p t r
t 15
V l : voltage at
pin 3 (CONTRA)
1
V t : voltage at
pin 22 (CONTRB)
. Now the initial
Preliminary specification
level detector
input
time detector
input
MED626
TEA0675
t
t
t
t