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Jitter Analysis for the PLL in the Baseband Signal
류흥균,안수길,Ryu, Heunggyoon,ANN, Souguil The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.1
Considering transition gating of the input unipolar NRZ signal, the equivalent linear time-invariant model has been derived for the PLL in the timing clock recovery circuits. The magnitude of the alignment and accumulated jitter has been found along a chain of repeaters. For the timing recovery circuit of 90 Mbps optical communication system, the computer simulation shows that, for the first stage of the chain, the alignment jiter and the accumulated jitter are of -5.1766 dB and for the 7-th stage, the alignment jitter and accumulated jitter have the value of -1.0193dB, 4.9053 dB respectively.
Optimum Parameter Determination of PLL Used in Timing Clock Recovery Circuit
류흥균,안수길,Ryu, Heunggyoon,ANN, Souguil The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.3
The closed-loop transfer function of 2-nd order PLL (phase-looked loop)of which loop filter has active-lag 1-st order is found. Considering the three criteria of system performance: the transient response time of the circuit, noise bandwidth by the linear analysis and stability which uses root-locus method, the optimum value of damping factor is 1.0 and the natural frequency which depends upon the signal frequency can be determined after consideration of the trade-off relationship between the transient response time and the noise bandwidth.
A Study on the Energy Extraction Using G-peak from the Speech Production Model
배명진,임재열,안수길,Bae, Myungjin,Rheem, Jaeyeol,ANN, Souguil The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.3
By the speech production model, the first positive peak in a pitch interval of the voiced speech is mainly affected by the glottis and the first formant component, known as a typical energy source of the voiced speech. From these characteristics, the energy parameter can be replaced by the area of the area of the positve peak in a pitch interval, which parameter is generally used for classification of speech signals. In this method, the changed energy parameter is independent of window length applied for analysis, and the pitch can be extracted smultaneously. Furthermore, the energy can be extracted in the pitch period unit.
An Effective Storage Method During A Sampling of Speech Signals
배명진,이인섭,안수길,Bae, Myungjin,Lee, Inseop,ANN, Souguil The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.3
It is necessary for the speech samples to be stored in memory buffer before speech analyzers without a real time processor process them. In this paper, we propose an algorithm that uses the buffer efficiently, when the analog speech signal is converted to the digital samples by the analog to digital converter. In order to implement this method in real time, the buffer is divided into the starting buffer and the remaining buffer. Until a voiced speech is found, the converted samples are sequentially stored in the starting buffer, and then the buffer is shifted. When a voiced speech is found, the next samples are sequentally recorded in the remaining buffer.
The Extraction of Nasal Sound by Using G-peak in Continued Speech
배명진,정익주,안수길,Bae, Myung Jin,Chung, Ik Joo,ANN, Souguil The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.2
In this paper, we describe a new algorithm for extracting nasal sound in continuous speech. We obtain pitches by using Area Comparison Method and extract nasal sound by comparing the area of G-peak and the area of side peak in one pitch interval. By using this method, the process can be speeded up. Therefore realtime processing is possible with a general microprocessor.