Title :
Notch Filtering of humming GSM mobile telephone noise
Author :
Claesson, Ingvar ; Rossholm, Andreas
Author_Institution :
Blekinge Inst. of Technol., Ronneby
Abstract :
A common problem in the world\´s most widespread cellular telephone system, the GSM system, is the interfering signal generated in TDMA cellular telephony. The infamous "bumblebee" is generated by the switching nature of TDMA cellular telephony, the radio circuits are switched on and off at a rate of approximately 217 Hz (GSM). This paper describes a study of two solutions for eliminating the humming noise with IIR notch filters. The simpler one is suitable for any exterior equipment. This method still suffers from a small residual of the noise, resulting from the IDLE slots of the sending mobile. The more advanced IIR structure for use within the mobile also eliminates this residual
Keywords :
IIR filters; cellular radio; interference suppression; notch filters; time division multiple access; GSM mobile telephone; IDLE slot; IIR notch filtering; TDMA cellular telephony; humming noise elimination; interfering signal; radio circuit switching; Acoustic noise; Filtering; Frequency; GSM; Microphones; Noise generators; Power harmonic filters; Speech; Switching circuits; Telephony;
Conference_Titel :
Information, Communications and Signal Processing, 2005 Fifth International Conference on
Conference_Location :
Bangkok
Print_ISBN :
0-7803-9283-3
DOI :
10.1109/ICICS.2005.1689270
