ITU-T Q 24-1988 MULTIFREQUENCY PUSH-BUTTON SIGNAL RECEPTION《多频按键信号的接收》.pdf

INTERNATIONAL TELECOMMUNICATION UNION)45G134 1 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G02%#/-%.$!4)/.3G0G0/.G0G04%,%0(/.%37)4#().G0G0!.$G0G03).!,).).4%2.!4)/.!,G0G0!54/-!4)#G0G0!.$3%-)G13!54/-!4)#G0G07/2+).-5,4) Values of A range from -22 to -30 to suit national conditions.b)The high group frequency power level may be up to 4 dB more or 8 dB less than the low group frequency power level.c)For analogue multifrequency push-button receivers only.