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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
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Volume & Issues
Volume 8, Issue 5 - Oct 1989
Volume 8, Issue 4 - Aug 1989
Volume 8, Issue 1 - Feb 1989
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Loudness and Perception of sound
Toshio Sone ; Yoiti Suzuki ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 7~22
This paper presents basic data on loudness level and loudness along with data obtained by the authors, and describes an application of the idea of masked loudness to perception of music in the presence of noise. It is shown that timbre or sound quality of music is well explained by masked loudness vs frequency characteristic.
Precision Calibration of 1-Inch Standard Condenser Microphone by Reciprocity Technique
Suh Sang Joon ; Moon Jae Jho ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 23~32
The calibration of 1 inch standard condenser microphone is done by the reciprocity calibration method. There are two kinds of reciprocity calibration, free-field calibration and pressure calibration. The pressure sensitivities of the three 1 inch condenser microphones are determined by pressure calibration. The accuracy of the pressure sensitivity of the microphone depends on the accuracies of the voltage and dimension measurements as well as the various corrections for the coupler. If the individual accuracies for the measurements and corrections are achieved, it is estimated that the over-all accuracy is approximately 0.05dB at low and middle frequencies decreasing to about 0.ldB over 10kHz.
Musical Tone Synthesis using Nonlinear Distortion Method
Lee Duck-Soo ; Sung Keong-Mo ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 33~50
In this paper, musical tone, especially instrument tones are synthesized using nonlinear distortion technique. Nonlinear distortion is very simple but versatile method when you synthesize musical instrument tones. It basically consists of one sine oscillator and amplifier which makes distortion to Input wave. Output wave has many harmonics that can be controlled by varying shaping function, which is the transfer function of nonlinear amplifier. Shaping function Is obtained from the analyzed harmonic amplitude data. Given harmonics amplitudes, Chebyshev polynomial is used to produce the shaping function that exactly makes the given harmonics at steady state. We contructed non -real time nonlinear distortion synthesizer program running at IBM-PC. To quantify the satis faction of synthesised tones, listening test is carried out, and the result is presented.
Analysis of Sound Fields by Finite Element Method
Choi Seok Joo ; Tachibana Hideki ; Park Byeong Jeon ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 51~58
The finite element method is usually formulated by utilizing the variation principle. In this paper, we introduce the approximate equation of finite element from Helmholtz eqation by means of the Galerkin method, which provides the best approximation of those methods known as the method of weighted residuals, and a numerical simulation based of the finite element method is applied to analysing the acoustic modes and the pattern of sound radiation in two and three dimensional sound fields. Beside the numerical calculations, the acoustic modes and the sound pressure level are mesured by scale model experiments. The finite element analysis of the model shows very good agreement with the mesured results.
Trend of Subjective Assessment in Room Acoustics
Kang Seong-Hoon ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 59~69
A Study on the Analysis and Recognition of Korean Speech Signal using the Phoneme
Kim Y. I. ; Hwang Y. S. ; Youn D. H. ; Cha I. W. ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 70~77
In this paper, Korean language recognition using the phoneme is studied. The experiment is carried out by dividing 545 isolated words into phonemes. Using linear prediction coefficients the recognition rate of consonants, vowels, and end-consonants are
, respectively. Recognition rate of isolated words combined with the phonemes is
. Itakura-saito distortion measure is used to phoneme segmentation and phoneme recognition.
A Study on the Phoneme Based Analysis of Korean Initial Plosives Using Statistical Method and Perception Tests
Jo Cheol-Woo ; Lee Woo-Sun ; Lee Cyu-Ho ; Kim Jong-Ahn ; Lim Gwang-Il ; Lee Tae-Won ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 78~85
This paper describes a statistical methods and perception test for extracting the parameters to be used for the synthesis-by-rule of Korean plosives. Formant synthesizer is chosen for the synthesis of the phonemes. Speech materials for the analysis consists of 72 CV monosyllables from the single male speaker. The analysis is done mainly focused on the variation of parameters in time and frequency domain, then perception tests are executed to estimate the effects of variations of the formant transitions.
A Speech Representation and Recognition Method using Sign Patterns
Kim Young Hwa ; Kim Un Il ; Lee Hee Jeong ; Park Byung Chul ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 86~94
In this paper the method using a sign pattern( +,- ) of Mel-cepstrum coefficients as a new speech representation is proposed. Relatively stable patterns can be obtained for speech signals which has strong stationarity like vowels and nasals, and the phonemic difference according to the individuality of speakers can be absorbed without affecting characteristics of the phoneme. In this paper we show that the reduction of recognition procedure of phonemes and training procedure of phoneme models can be achieved through the representation of Korean phonemes using such a sign pattern.
A DSP Evaluation System with variable Data Acquisition Buffer Architecture for Real Time Signal Processing
Ahn D. S. ; Seo H. S. ; Cha I. W. ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 95~101
For developing new algorithms or dedicated hardware by using general purpose Digital Signal Processor chip, emulator H/W and simulator S/W are indispensible. But the most of DSP emulators have limitations on H/W flexibility according to their generalized architectures. In this paper, a DSP evaluation system for real time signal processing was developed using TMS 32020. The I/O buffers storing acquisition data of the system were designed to have variable length
A Study on the Speech Recognition for DDD Area - Name Using Vector Quantization with Time Information
LEE S. K. ; LEE K. S. ; ANN T. O. ; CHO H. J. ; BYON Y. C. ; KIM S. H. ;
The Journal of the Acoustical Society of Korea, volume 8, issue 5, 1989, Pages 102~112
In this paper, we proposed the study on speaker-independent isolated word recognition for DDD area-name using vector quantization and chose total 146 DDD area-name to recognize words for application of dialing system. We made the codebook using 12th LPC cepstrum coefficients and used the minsum and the minimax method to find the centroid and we applied 3 splitting rule to a codebook generation. The single section and the multi section with time information were used to generate the codebooks and the over-lapped section codebook was used, too. From the experiment result, we proved that the minsum method was better than the minimax method and the evaluation of the system yielded an accuracy of about 90 percents In case of speaker-independent.