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TEA0675T Datasheet(PDF) 10 Page - NXP Semiconductors |
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TEA0675T Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 32 page 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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