Electroacoustic Analysis Research Articles

Voice quality after treatment for T1a glottic carcinomaRadiotherapy Versus Laser Cordectomy

The purpose of this study was to assess the anatomic and functional outcomes and compare the voice quality in patients affected by T1a glottic carcinoma treated with curative intent with radiotherapy or laser cordectomy. Fifty-seven cases were analysed: 27 after curative radiotherapy and 30 after laser cordectomy. All patients were studied with videolaryngostroboscopy, voice analysis by narrow spectrogram, and vocal parameters (Jitter, Shimmer, noise/harmonic ratio, and diplophonia). Videolaryngostroboscopy showed severe glottic inadequacy in 25% of cases treated with radiation and insufficient compensation ‘ventricular band’ or ‘with arytenoid hyperadduction’ in 65% of cases after surgery. Severe dysphonia on the electro-acoustic analysis of voice was observed in 25% of cases after radiation and 70% after laser (p<0.001). Fundamental frequency and vocal parameters showed more favourable results in the radiation group (p<0.001). Voice assessment showed better results after radiotherapy compared with laser cordectomy. Voice outcome should be carefully considered in the treatment decision for T1 glottic carcinoma.

Carbonated hydroxyapatite as bone substitute

Abstract B-carbonateapatite (CHA) powder was synthesized starting from calcium nitrate tetrahydrate, diammonium hydrogen phosphate and sodium hydrogen carbonate. The powder was fully characterized in terms of phase purity, stoichiometry, morphology, specific surface area and particle size distribution. The thermal stability of the powder in air and CO 2 atmosphere also was evaluated by thermal analysis. Electroacoustic analysis of the water based suspension of the CHA powder was used to determine the stability of the slurry. Porous bodies of CHA were prepared by impregnation of cellulose sponges with a proper slurry of the powder and optimizing the subsequent sintering. The fired samples were characterized in terms of phase purity and carbonate content, microstructure and pore size distribution. The compressive strength also was evaluated, resulting in 6.0±0.5 MPa. First results of in vivo tests on New Zealand White rabbits showed good biocompatibility and osteointegration of the CHA implant, with higher osteoconductive properties and earlier bioresorption, compared to HA samples, used as control.

Acoustical factors of noise created by suctioning middle ear fluid.

To quantify the intensity, spectral content, and duration of exposure for suction noise created during aspiration of middle ear fluid following myringotomy. Case series. Tertiary care center. Convenience sample of 245 myringotomies performed on 124 patients ranging in age from 6 months to 14 years (mean age, 2 years 8 months). Intensity, spectral content, and duration of exposure associated with suction noise were defined by electroacoustic analysis of high-fidelity tape recordings of the noise created during suctioning middle ear fluid. The intensity of suction noise ranged from 74 to 117 dB; most acoustic energy was concentrated in the frequency range between 1.7 and 6.0 kHz, and the duration of exposure varied from 4 to 23 seconds.

Electroacoustic Analysis and Enhancement of Alaryngeal Speech edited by Andrew Sekey

<i>Electroacoustic Analysis and Enhancement of Alaryngeal Speech</i> edited by Andrew Sekey

Hearing Aid Monitoring

The effectiveness of a daily hearing aid monitoring program was evaluated. Routine monitoring was followed by a detailed visual-auditory inspection and by electroacoustic analysis. Results suggested that improvements could be made in the existing program to improve the effectiveness of monitoring procedures. Thus, several changes were made in the inspection program, including the addition of periodic electroacoustic analysis of all hearing aids. One year later, a duplicate study revealed a significant decrease in the incidence of hearing aid malfunction.

On the Calibration of Two Commercially Recorded Versions of CID Auditory Test W-22

Electroacoustic analysis of two commercially available versions of CID W-22 indicated significant differences in calibration. Measured differences in level between calibration tone and stimulus words were plus 5 to 8 dB for Technisonic recordings and plus one dB for Auditec recordings. As a consequence, the Technisonic Studios recordings were approximately 40% more intelligible than were Auditec recordings when presented to normal-hearing listeners in a background of competing speech spectrum noise in a condition where the level of the calibration tone of the respective recordings was used as the reference value to specify nominal speech-to-noise ratio.

Researches on the Singing Voice

Some recent methods of electroacoustical analysis are employed to study separately the different parameters characteristic of the singing voice. The analysis is effected on the same musical phrase, which has been chosen of well-specified characteristics, as performed by different singers: some were famous artists, some instructed voices, some beginners. In particular, we take into consideration the timbre variations and the relations between amplitude and frequency vibrato. From this comparison we can draw some considerations that, without entering the field of musical aesthetics, can be interesting in the study of the particularities of the singing voice.

An Experimental Study of Pause in English Grammar

RTS HIS PAPER iS an attempt to apply the experimental approach to 1 questions of grammar. The technique, a combination of psychophysicall and grammatical analysis, consists of four steps: (1) the collecting of quantitative judgments of phrasing on a large sample of continuous discourse; (2) an electro-acoustical analysis of the speech material to determine the pauses physically present and their duration; (3) a comparison of the perceptual judgments of pause with the pauses shown by the objective record; and (4) a syntactic analysis of the recorded passage and a comparison of this with the phrasing as determined in the first step. In the following presentation, Cowan is responsible for Part I (Steps One to Three), Bloch for Part II (Step Four).