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TEA0675T Datasheet(PDF) 10 Page - NXP Semiconductors

Part # TEA0675T
Description  Dual Dolby* B-type noise reduction circuit for playback applications
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA0675T Datasheet(HTML) 10 Page - NXP Semiconductors

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1996 Jun 07
10
Philips Semiconductors
Preliminary specification
Dual Dolby* B-type noise reduction circuit
for playback applications
TEA0675
Short description ‘music search’
A system for ‘music search’ mainly consists of a level and
a time detection (see Fig.4). For adapting and decoupling
the input signal will be amplified (A), then rectified (B) and
smoothed with a time constant (C). So the voltage at (C)
corresponds to the signal level and will be compared to the
predefined pause level at the first comparator (D), the level
detector. If the signal level becomes smaller than the
pause level, the level detector changes its output signal.
Due to the output level of the level detector the capacitor
of the second time constant (E) will be charged,
respectively discharged. If the pause level of the input
signal remains for a certain time, the voltage at the
capacitor reaches a certain value, which corresponds to
an equivalent time value. The voltage at the capacitor will
be compared to a predefined time-equivalent voltage by
the second comparator (F), the time detector. If the pause
level of the input signal remains for this predefined time,
the time detector changes its output level for ‘pause found’
status.
Fig.4 Integrated ‘music search’ function.
handbook, full pagewidth
MED624
COMPARATOR 1
COMPARATOR 2
t1
t2
INPUT
AMPLIFIER
RECTIFIER
(A)
(B)
(C)
(D)
(E)
(F)
OUTPUT
Vt
VI
LEVEL DETECTOR
TIME DETECTOR


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