STOPBAND

A band of frequencies, between specified limits, that a circuit , such as a filter or telephone circuit, does not transmit. ( 188 ) Note 1: Frequencies above the lower limit and below the upper limit are not transmitted, i.e. , are not allowed to pass. Note 2: The limiting frequencies are those at which the transmitted power level increases to a specified level, usually 3 dB below the maximum level, as the frequency is decreased or increased from that at which the transmitted power is a minimum. Note 3: The difference between the limits is the stopband bandwidth , usually expressed in hertz .