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Volume 36, Issue 1
Displaying 1-12 of 12 articles from this issue
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Kiyoteru IshiiArticle type: Article
1979 Volume 36 Issue 1 Pages 1-
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
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Hiroshi Irii, Kazuhiro KakehiArticle type: Article
1979 Volume 36 Issue 1 Pages 2-8
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSOne of the method to treat the voice loudness quantitatively is Loudness Rating method. It is determined by loudness balance between reference voice which passes through wide and flat frequency characteristic transmission system, and within subject. These variation is considered to be caused by auditory psycological factors. This paper reports these factors influence, such as, listening level, timbre difference, presentation interval, and level variation in voice duration time to the measurement value variation. From this investigation, it is confirmed that the most dominant and sensitive factor is the timbre difference between reference and measured voice due to these transmission sensitivity frequency characteristic difference. But, if band limitation is introduced to the measurement, it makes the timbre differnce decrease and consequently measurement variation decrease. These results can be adopted to the telephone transmission rating which uses the same loudness balance method, and will make the measurement accuracy increase.View full abstractDownload PDF (857K) -
Satoshi Imaizumi, Shizuo Hiki, Minoru Hirano, Hideaki MatsushitaArticle type: Article
1979 Volume 36 Issue 1 Pages 9-16
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSPossibility of differentiating causative diseases by a sound spectrographic analysis of pathological voices was investigated. Voice materials used were sustained vowels uttered by patients of vocal polyp(or nodule), sulcus vocalis, recurrent laryngeal nerve paralysis and laryngeal cancer(110 cases in total), and normal speakers(20 cases). Acoustical parameters, which were revealed to be valuable in our previous analysis by computer, such as the degree of the fluctuation in the fundamental frequency and in the amplitude, richness of higher harmonic components, and amount of noise components in various frequency ranges were measured from pattern, section and amplitude display of the sound spectrograms. Using canonical analysis based on those acoustical parameters, voise of about 85% of the patients were differentiated from that of the normal speakers, and for about 75% of the patients suffering from laryngeal cancer, the kind of disease was identified correctly.View full abstractDownload PDF (957K) -
Takashi Miyakita, Hajime Miura, Akiyoshi Ito, Kozo Hiramatsu, Koichi T ...Article type: Article
1979 Volume 36 Issue 1 Pages 17-28
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSThe purpose of the present study is to assess the influence of AR on the sound transmission in the middle ear. Reduction of TTS at 0. 5, 1, 1. 5, 2, 4, and 8kHz has been used as the index of attenuation effect of the AR. The test ear of each of ten subjects with normal hearing acuity was exposed to one of six pure tones for three minutes, during which an octave band noise(f_c=4000Hz) of 110dB SPL was presented to the contralateral ear in order to activate AR. Three reflex activating conditions were used; (1)no exposure(control), (2)continuous exposure(noise steady), (3)intermittent exposure with 50ms on- and 50ms off-time(noise 50/50). The largest value of TTS was observed in the control condition. TTS was reduced when a reflex activating noise was presented to the contralateral ear. The reduction of TTS was remarkable in the lower frequency region, but not so large in the higher frequency region. The noise 50/50 condition resulted in greater reduction of TTS compared with the noise steady condition. However large individual difference were observed. These differences in the reduction of TTS can be explained from the dynamic properties of AR. Magnitude of AR activated by noise 50/50 was maintained almost constant during three minutes exposure, but large adaptation was observed in the noise steady condition. The increase of transmission loss induced by AR was estimated from the reduction of TTS at 2kHz.View full abstractDownload PDF (1340K) -
Kohji Hohkawa, Yoshiki Yamauchi, Shokichiro YoshikawaArticle type: Article
1979 Volume 36 Issue 1 Pages 29-35
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSThe construction methods of spectrum analyzer are presented in which SAW chirp filters are used. There are two basic methods on construting spectrum analyzer: One of which is construction using chirp filters with different chirp rates, and the other is construction using filters with the same chirp rate. It is verified that the latter has better response with the less spurious, in spite of the simple fabrication capability. The simple electrical apodization method which enables improvement of the accuracy of analized signal, is proposed and its validity verified by experiment. The construction methods of spectrum analizer with larger facility, by using filters with small TB products are also proposed and its validity verified by the experiments.View full abstractDownload PDF (830K) -
Tomoo Kamakura, Ing-miin Chou, Kazuo IkegayaArticle type: Article
1979 Volume 36 Issue 1 Pages 36-41
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSBy using a horn loudspeaker, experimental data on the parametric array in air are taken for the beam pattern and the propagation curve. The primary frequencies are 20kHz and 15kHz, so the difference frequency signal generated by the parametric array is 5kHz. Because of space limitation and weakness of the primary waves, all measurements are carried out in the interaction region. As spurious difference signals produced in the source are strong, the corrected predictions are presented for acoustical properties of the array. The correction curves of the parametric array is also presented in this paper.View full abstractDownload PDF (741K) -
Shunichi NakamuraArticle type: Article
1979 Volume 36 Issue 1 Pages 42-43
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
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Miaki YamamotoArticle type: Article
1979 Volume 36 Issue 1 Pages 44-48
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
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Shokichiro Yoshikawa, Hajime MiuraArticle type: Article
1979 Volume 36 Issue 1 Pages 49-57
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
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Masao KanoArticle type: Article
1979 Volume 36 Issue 1 Pages 58-61
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSDownload PDF (513K) -
Hiroya Fujisaki, Masayuki SawashimaArticle type: Article
1979 Volume 36 Issue 1 Pages 62-66
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
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Takesaburo YanagisawaArticle type: Article
1979 Volume 36 Issue 1 Pages 67-
Published: December 25, 1979
Released on J-STAGE: June 02, 2017
JOURNAL FREE ACCESSDownload PDF (198K)
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