We have locked a whispering-gallery resonance of a fused-silica microsphere to a frequency-scanning laser. The resonance frequency is modulated by axial compression of the microsphere, and phase-sensitive detection of the fiber-coupled optical throughput is used for locking. Using a laser wavelength of either 1570 nm or 830 nm, we demonstrate a locked tracking range exceeding 30 GHz for a micro...

The paper gives an automated procedure to design rational decimation compression systems that resample twodimensional bandpass signals at their Nyquist rates. Our procedure takes a sketch of the desired bandpass shape in the frequency domain, circumscribes it with a parallelogram of minimal area, and linearly maps the minimal enclosing parallelogram onto one period of the frequency domain. From...

The Discrete Wavelet Transform is the most powerful and new signal compression technique which uses multiresolution analysis for analyzing speech signal. Here we are doing parallel speech compression using two different wavelet transforms like Haar wavelets and Bi-orthogonal wavelet transformation (Bior). The resultant of components which are in high frequency bands are fusioned together and di...

Years of extensive research in the field of speech processing for compression and recognition in the last five decades, resulted in a severe competition among the various methods and paradigms introduced. In this paper we include the different representations of speech in the time-frequency and time-scale domains for the purpose of compression and recognition. The examination of these represent...

Time-frequency analysis and the transforms that it gives rise to play an important role in digital signal processing. In lossy audio compression, for instance, it has been found that working in the transform domain leads to methods that achieve a much higher level of signal compression than could be achieved in the temporal domain. This article gives an introduction to time-frequency analysis t...

In this paper we present an approach of selective compression of an image sequence based on a priori selection of Region(s) Of Interest (ROI). This method relies on a given motion-based segmentation analysis. The problem of selective compression based on the concept of inhomogeneous spatial reconstruction quality is considered in the context of hybrid DPCM subband coding. Both spatial and frequ...

This paper presents the implementation of Linear Frequency Modulation (LFM) pulse compression technique over acoustic waveguides at frequency range (2kHz--3kHz). The medium used for acoustic chirp propagation is air. Real time pulse compression was carried out over DSP kit (TMS320C6713). The obtained range from the compressed pulse accedes to the actual range of the target (sound source). The s...

In the event of an accident or emergency, a victim’s medical information such as blood type, prescribed drugs, and other pertinent medical history is critical to Emergency Medical Technicians (EMTs) so that the correct treatment can be provided to the victim as quickly as possible. Victims of car accidents, heart attacks, etc., are not always able to answer simple but crucial medical questions....

Byte pair encoding (BPE) algorithm was suggested by P. Gage is to achieve data compression. It encodes all instances of most frequent byte-pair using zerofrequency byte in the source data. This process is repeated for maximum m possible number of passes until no further compression is possible, either because there are no more frequently occurring byte pairs or there are no more unused zero-fre...