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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of the Acoustical Society of Korea
Journal Basic Information
Journal DOI :
The Acoustical Society of Korea
Editor in Chief :
Volume & Issues
Volume 10, Issue 6 - Dec 1991
Volume 10, Issue 5 - Oct 1991
Volume 10, Issue 4 - Aug 1991
Volume 10, Issue 3 - Jun 1991
Volume 10, Issue 2 - Apr 1991
Volume 10, Issue 1 - Feb 1991
Selecting the target year
A Study on the Segmentation of Speech Signal into Phonemic Units
Lee, Yeui-Cheon ; Lee, Gang-Sung ; Kim, Soon-Hyon ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 5~11
This paper suggests a segmentation method of speech signal into phonemic units. The suggested segmentation system is speaker-independent and performed without anyprior information of speech signal. In segmentation process, we first divide input speech signal into purevoiced region and not pure voiced speech regions. After then we apply the second algorithm which segments each region into the detailed phonemic units by using the voiced detection parameters, i.e., the time variation of 0th LPC cepstrum coefficient parameter and the ZCR parameter. Types of speech, used to prove the availability of segmentation algorithm suggested in this paper, are the vocabulary composed of isolated words and continuous words. According to the experiments, the successful segmentation rate for 507 phonemic units involved in the total vocabulary is 91.7%.
On the Frequency Domain Pitch Detection of Noise Corrupted Speech Signals -Minimizing the Effects of the F1 by the Spectral AMDF-
Bae, Myung-Jin ; Park, Chan-Sou ; Ann, Sou-Guil ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 12~18
Detecting the fundamental frequency(Fo) of the speech signal is a problem in many speech applications. A problem of the pitch detection method in the frequency domain is occurred by the first formant and the background noise. Thus, in this paper, we proposed a pitch detection algorithm in the frequency domain that reduces the effects of the first formant and the background noise by the spectral AMDF function. Several computer simulation results showed that the proposed algorithm was very effective for fundamental frequency detection.
A Study on the Gaussian-filtered
System for the Digital Mobile Communication System
Kim, Kee-Keun ; Heo, Dong-Kyu ; Kim, Ju-Koang ; Ryu, Heung-Gyoon ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 19~26
which is a novel digital mobile communication modulation scheme has been introduced and described.
is a modulation scheme that bandlimits NRZ digital data with Gaussian filter and modulates it by
scheme which uses two shaping pulses and two carriers which are pairwise quadrature. Thus transmission bit rate can be enhanced and available signal space dimensions are more efficiently utilized, with comparison to the already-existing GMSK, QPSK and OQPSK modulation methods. Via the computer simulation, bit error rate of
scheme which is bandlimited by gaussian filter to be suitable for digital mobil communication, is lower than that of
by 1.4[dB] in case that the signal-to-noise ration is 0[dB], but we have confirmed that
modulation scheme is approximately equivalent to the GMSK in the respect of power efficiency, and transmission efficiency of
is improved to 1.5 times than that of GMSK.
Korean Word Recognition Using Vector Quantization Speaker Adaptation
Choi, Kap-Seok ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 27~37
This paper proposes the ESFVQ(energy subspace fuzzy vector quantization) that employs energy subspaces to reduce the quantizing distortion which is less than that of a fuzzy vector quatization. The ESFVQ is applied to a speaker adaptation method by which Korean words spoken by unknown speakers are recognized. By generating mapped codebooks with fuzzy histogram according to each energy subspace in the training procedure and by decoding a spoken word through the ESFVQ in the recognition proecedure, we attempt to improve the recognition rate. The performance of the ESFVQ is evaluated by measuring the quantizing distortion and the speaker adaptive recognition rate for DDD telephone area names uttered by 2 males and 1 female. The quatizing distortion of the ESFVQ is reduced by 22% than that of a vector quantization and by 5% than that of a fuzzy vector quantization, and the speaker adaptive recognition rate of the ESFVQ is increased by 26% than that without a speaker adaptation and by 11% than that of a vector quantization.
Word Recognition Using VQ and Fuzzy Theory
Kim, Ja-Ryong ; Choi, Kap-Seok ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 38~47
The frequency variation among speakers is one of problems in the speech recognition. This paper applies fuzzy theory to solve the variation problem of frequency features. Reference patterns are expressed by fuzzified patterns which are produced by the peak frequency and the peak energy extracted from codebooks which are generated from training words uttered by several speakers, as they should include common features of speech signals. Words are recognized by fuzzy inference which uses the certainty factor between the reference patterns and the test fuzzified patterns which are produced by the peak frequency and the peak energy extracted from the power spectrum of input speech signals. Practically, in computing the certainty factor, to reduce memory capacity and computation requirements we propose a new equation which calculates the improved certainty factor using only the difference between two fuzzy values. As a result of experiments to test this word recognition method by fuzzy interence with Korean digits, it is shown that this word recognition method using the new equation presented in this paper, can solve the variation problem of frequency features and that the memory capacity and computation requirements are reduced.
Experimental Study on the Dynamic Balancing Method of an Unbalanced Rigid Rotor -Using Seven Run Method-
Chang, Ho-Gyong ; Choi, Hyun-Tai ; Kim, Ye-Hyun ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 48~55
In this study, the unbalanced rigid rotor mounted on two pedestals is balanced u. ng the dynamic balancing procedure, and the compensating masses are estimated by the seven run method. Also, the reductions of vibration level are examined, before and after balancing procedures. In the experimental results, it is shown that the vibration amplitudes measured at the two pedestals are proportional to the unbalanced mass. The seven run method which requires measurement of vibration amplitudes only and not vibration phase angle is proved markedly useful in consideration of the dynamic balancing procedure.
The Prospects for Voice Communications in the 21st Century
Lee, Hae-Uk ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 56~57
국내외 음성 인식 기술 동향 및 전망
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 58~63
On the Research Trends and Prospects of Speech Database
Jeong, Yon-Hyeon ; Lee, Yong-Ju ;
The Journal of the Acoustical Society of Korea, volume 10, issue 4, 1991, Pages 64~71
This paper infroduces the research trends and prospects of speech database and the construction of common speech database for Korean.