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TEA0678T Datasheet(PDF) 10 Page - NXP Semiconductors

No. de pieza TEA0678T
Descripción Electrónicos  Dual Dolby* B-type noise reduction circuit, automatic music search, with differential outputs and mute
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA0678T Datasheet(HTML) 10 Page - NXP Semiconductors

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1996 Jun 06
10
Philips Semiconductors
Preliminary specification
Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute
TEA0678
General note
It is recommended to switch off VCC with a gradient of 400 V/s at maximum to avoid plops on tape in the event of contact
between tape and tape head while switching off.
Fig.3 AMS threshold level.
(1) AMS threshold level for application circuit (Fig.1).
(2) AMS threshold level for test circuit (Fig.9).
handbook, full pagewidth
−60
−20
MED623
102
103
104
105
−40
−50
−30
(dB)
(Hz)
(1)
(2)
General note on AMS
The speed of tape at the tape head during FF, REW
depends on the diameter of the tape on the spindle.
Depending on this speed, the recorded signal occurs
transformed in frequency and magnitude as a function of
the original signal in playback mode speed. For example:
A recorded pause of 3 s passes the tape head at its
highest speed in 111 ms, e.g. during FF mode near tape
end. This time constant of 111 ms corresponds to a pause
of 1.3 s at the beginning of the tape in playback mode.
Thus a pause T is uniquely defined outside the interval
1.3 s < T < 3 s. Inside this interval T will be recognized as
a pause or not dependent on the local point of tape,
respectively the speed of tape. Times of pauses described
investigated for this document are valid for tape devices
with a speed of its spindle (FF, REW):
respectively 12 to 27 times of the playback speed.
ω
r
51
1
s
---
=


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