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TEA7540 Datasheet(PDF) 4 Page - STMicroelectronics |
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TEA7540 Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 12 page  stracted from the incoming signal before the com- parison. So very high noise level in one mode cannot trouble the comparison between the useful signals. The result of the comparison manages the attenu- ators in the following way: - The maximum attenuation is switched on the mode where the speech signal is the lowest. The maximum attenuation is fixed by two external resistor (maximum 52dB). The time constant of the switch is fixed by the timer via an external capacitor. - When neither party is talking both attenu- ators are set to a medium attenuation. Thus each mode is in idle mode. The time constant of the switch from active mode to idle mode must be long enough to prevent from switching to idle mode between two words (see fig.B). This time constant is fixed by an external RC. Figure A Em Rec 1 0 SPEECH/NOISE A max dB 0dB 0 1 IDLE (A max/2) D93TL009A Figure B TEA7540 4/12 |
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