Notch Filtering of humming GSM mobile telephone noise

Claesson, Ingvar; Rossholm, Andreas

doi:10.1109/icics.2005.1689270

Cited by 20 publications

(6 citation statements)

References 3 publications

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“…Typical application areas include for example biomedical engineering and communications [1,2]. Removing powerline interferences from ECG, EEG, and EMG recordings [3], filtering of humming GSM mobile telephone noise [4], and estimation of power system frequency [5] are specific examples of using notch filters. The design procedure of notch filters is usually a difficult task, particularly when the signals on a very narrow frequency band must be suppressed and those in the immediate neighborhood should be maintained without distortions.…”

Section: Introductionmentioning

confidence: 99%

Time-Varying IIR Notch Filter with Reduced Transient Response Based on the Bézier Curve Pole Radius Variability

Kocon

Piskorowski

2019

Applied Sciences

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In this paper a concept of the second order digital infinite impulse response narrow band-reject filter with reduced transient response is proposed. In order to suppress the transient response of the considered infinite impulse response (IIR) notch filter its pole radius is temporarily varied in time using the Bézier parametric curve. Computer simulations verifying the effectiveness of the proposed pole-radius-varying notch filter are presented and compared to the performance of the traditional time-invariant filter using ECG signals distorted by unwanted powerline interference.

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Section: Introductionmentioning

confidence: 99%

Time-Varying IIR Notch Filter with Reduced Transient Response Based on the Bézier Curve Pole Radius Variability

Kocon

Piskorowski

2019

Applied Sciences

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“…Those studies mainly focused on designing infinite impulse response (IIR) notch filters by the signal processing technology [2][3][4] or on data burst transmission schemes [5]. The first method needs more million instructions per second (MIPS) for operation, and hence, current consumption increases accordingly.…”

Section: Introductionmentioning

confidence: 99%

A method for reducing a bumblebee noise generated by a GSM technology in a smartphone

Kim

2012

2012 12th International Conference on Intelligent Systems Design and Applications (ISDA)

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This paper presents a method for reducing a bumblebee noise generated by a GSM technology in a smartphone. Global smartphone penetration has been very swift and 2 nd generation, 3 rd generation and 4 th generation communication technology are commercially used in the world. The 2 nd generation wireless telephone technology is based on two standards, depending on the type of multiplexing used the Global System for Mobile Communication (GSM) and CodeDivision Multiple Access (CDMA). In particular, the GSM technology has a market share of almost more than 79% in the world. GSM technology uses a channel access method that combines frequency division multiple access (FDMA) and time division multiple access (TDMA). There are four commercial frequency bands. GSM technology has a burst structure by a TDMA method. And hence, the GSM technology has a disadvantage; radiation noise is generated from an antenna propagation signal of the smartphone, and consequently, the voice quality of the smartphone is degraded. This noise is commonly known as bumblebee noise, buzz noise or TDMA noise. There have been several studies to reduce the noise since a release of GSM technology in a commercial market. Those studies mainly focused on designing infinite impulse response (IIR) notch filters by the signal processing technology or on data burst transmission schemes. The first method needs more million instructions per second (MIPS) for operation, and hence, current consumption increases accordingly. The latter method requires a change in the protocol standard of the GSM; hence, its feasibility is low. This paper presents hardware filters designed to reduce the bumblebee noise in smartphones, especially the bumblebee noise in the headset mode during calls. The bumblebee noise is easily generated in the headset mode of smartphones during calls because the headset is necessarily connected to the smartphone. This paper verified that, on an average the bumblebee noise was reduced up to 14dBm by experiments.

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“…It is used to suppress power line interference signal induced in the electrocardiogram (ECG) recording system [1]- [6]; to suppress narrow band signal in DS-spread spectrum communication systems [7]; to suppress humming signal in global system for mobile (GSM) telephone communication [8]; to estimate power system frequency [9] and so on.…”

Section: Introductionmentioning

confidence: 99%

Absolute Gradient Algorithm for Adaptive IIR Notch Filter

Nosan

Punchalard

2012

2012 9th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

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The gradient algorithm used absolute value of error signal as a criterion to adjust the filter coefficient of adaptive IIR notch filter is presented in this paper. The objective is to estimate or track the frequency of a single sinusoidal signal corrupted by additive white Gaussian noise. The proposed algorithm can solve the problem of selecting an initial condition as met in the previous method. Moreover, it also has a high convergence speed.

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Notch Filtering of humming GSM mobile telephone noise

Cited by 20 publications

References 3 publications

Time-Varying IIR Notch Filter with Reduced Transient Response Based on the Bézier Curve Pole Radius Variability

Time-Varying IIR Notch Filter with Reduced Transient Response Based on the Bézier Curve Pole Radius Variability

A method for reducing a bumblebee noise generated by a GSM technology in a smartphone

Absolute Gradient Algorithm for Adaptive IIR Notch Filter

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