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TEA0678 View Datasheet(PDF) - Philips Electronics

Part Name
Description
Manufacturer
TEA0678 Datasheet PDF : 28 Pages
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Philips Semiconductors
Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute
Preliminary specification
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.
handbook,2fu0ll pagewidth
(1)
(dB)
30
MED623
(2)
40
50
60
102
103
104
(1) AMS threshold level for application circuit (Fig.1).
(2) AMS threshold level for test circuit (Fig.9).
Fig.3 AMS threshold level.
(Hz)
105
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): ωr = 511-s-
respectively 12 to 27 times of the playback speed.
1996 Jun 06
10
 

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