Using digital Phase-Locked Loop (PLL) technique for assessment of periodic body movement patterns on a mobile phone
نویسندگان
چکیده
This paper applies digital PLL (Phase-locked loop) approach to the body movement classification problem. PLLs have been used efficiently in telecommunication to retrieve modulated signals from the background noise. Acceleration sensor signal processing often require the same kind of noise tolerance and the relevant movement patterns are frequently periodic, e.g. walking. The paper presents the PLL-based algorithm developed for step counting on a mobile phone and evaluates it against a commercially available wearable step counter.
منابع مشابه
طراحی PLL دو حلقه ای مبتنی بر آشکارسازی فاز پنجرهای با سرعت قفل بالا، توان مصرفی و اسپور مرجع پایین
In this paper, a dual loop PLL with short locking time, low power consumption and low reference spur is presented. The output frequency and reference frequency of the designed circuit are 3.2 GHz and 50 MHz, respectively, aimed to WiMAX applications. In the proposed circuit in locked state, some parts of the circuit could be powered off, to reduce overall power consumption. Phase detection in t...
متن کاملSimulating and Designing a PLL Frequency Synthesizer for GSM Communications
Phase locked loops (PLL) are used in almost every communication system. Some of the uses include recovering clock from digital data signals, performing frequency, phase modulation and demodulation, recovering the carrier from satellite transmission signals and as a frequency synthesizer. It is very well known that there are many designs in communication that require frequency synthesizers to ge...
متن کاملAll-Digital Phase Locked Loop (ADPLL) -A Review
--The All-Digital Phase-Locked Loop (ADPLL) is digital electronic circuit that are used in modern electronic communication systems like frequency synthesizer, modulator/demodulator etc. This paper presents a review of various ADPLL techniques. The range of input frequency of ADPLL is 40 to 98 MHz; the output frequency may be up to 2.92 to 4 GHz range. The components of ADPLL such as phase detec...
متن کاملPeriodic Disturbance Cancellation Using a Generalized Phase-Locked Loop
An effective technique for extracting an audio input from a composite signal that contains a nonstationary noise-corrupted periodic disturbance is presented. The proposed technique cancels the periodic disturbance using a synthesized signal whose parameters are adjusted adaptively. A combination of a generalized phase-locked loop (PLL) and an adaptive least mean square (LMS) method is used. The...
متن کاملA Review of Phase Locked Loop
This paper presents a review of phase locked loop (PLL) techniques. The different types of phase detector, loop filter and oscillators are discussed. It alleviates the problems associated with the classical analog PLL. Linear PLL, Digital PLL and All digital PLL models are implemented in Simulink Simulation results in Simulink gives the performance overview of the three types of PLL. Keywords— ...
متن کامل