PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Sound Spectrography”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources
PubMed2001

[A clinical application and study of analysis system of sound spectrography].

OBJECTIVE: The phonetic features were studied for non-velopharyngeal dysfunction in postoperative patients with cleft plate. METHODS: The feature of velopharyngeal competency of 32 postoperative patients with cleft palate were analyzed with KAY-7800 sound spectrograph, compared with characteristic of 30 subjects with normal phonogram. RESULTS: There were three types of abnormal phonogram for the postoperative patients of cleft palate with velopharyngeal competence. The heavy noise was a common sight. CONCLUSION: An analytic system of sound spectrography has certain value for evaluation of phonic function in cleft palate patients.

English Abstract↗
PubMed1997

The assessment of nasality with a nasometer and sound spectrography in patients with nasal polyposis.

With the development of computerized acoustic analysis systems, an objective measure of nasal speech has become readily available by means of a simple, noninvasive technique. In this study, we assessed the nasality in patients with multiple nasal polyposis before and after endoscopic sinus surgery. With the nasometer, we measured nasalance, which reflects the ratio of acoustic energy output of nasal sounds from the nasal and oral cavities, and the slope score of the nasogram curve. The nasalance scores of nasal sentences and the slope scores of the nasogram curves for all nasal consonants were significantly lower in patients with nasal polyposis than in healthy subjects. After surgery, however, the nasalance and slope scores increased significantly to the normal range. On the sound spectrographic analysis, the frequencies of the first nasal formant decreased slightly and the sound intensity increased slightly for all nasal consonants after surgery. However, no significant change was noticed in the frequencies of the second nasal formant. In conclusion, nasometric and sound spectrographic analyses are considered to be useful tools for objectively assessing the extent of nasality in patients with nasal airway obstruction.

Acoustics↗
PubMed1980

Acoustic analysis of pathological cries, stridors and coughing sounds in infancy.

In the examination of respiratory pathological sound phenomena in infancy (pathological crying, stridor and coughing sounds), besides the subjective-auditive observations and traditional examination methods (X-ray, endoscopy), acoustic analysis, as a new branch of bioacoustics, may be of much help. The various pathological infant vocalizations originating from the air passageways are merely symptoms, but they may furnish important diagnostic clues. Approximately 200 recordings of pathological sound signals derived from 180 infants suffering from 40 different diseases or anomalies were analyzed by means of sound spectrography, the fundamental frequency meter, and rarely, the minimal-time-interval spectra technique. The acoustical evaluation of the sound phenomena are not only of scientific and documentative value; they are also of great help in diagnostics and prophylaxis, in the suitable choice of diagnostic tools and in education and further training, i.e. in the everyday work of the pediatric otolaryngologist.

Acoustics↗
PubMed1986

[Acoustic analysis of voice production. Production trial from a clinical perspective].

This article presents an overview of relevant methods for acoustic analysis of voice from a clinical point of view: Mean speaking frequency and fundamental frequency in singing; frequency range of phonation; pitch perturbations; intensity range of phonation and phonetogram; cycle-to-cycle amplitude variations; Sound spectrography (Visible Speech) and Long-Time-Average-Spectrum.

Female↗
PubMed2007

Sound spectrogram analysis in patients receiving Kawahara's surgical voice restoration for advanced carcinoma of the hypopharynx and cervical esophagus.

Loss of voice after total laryngectomy is a major concern that has prompted much effort to develop methods of surgical voice restoration. In 1992, Kawahara described a tracheocolic shunt for voice restoration using a revascularized ileocolic graft. With this method, aspiration through the phonatory shunt is prevented by the ileocolic valve (Bauhin's valve), while vocalization is allowed. The purpose of this study was to use sound spectrogram analysis to evaluate voices surgically restored in that way. Between 2002 and 2005, 10 consecutive patients underwent laryngopharyngoesophagectomy with Kawahara's surgical voice restoration for advanced carcinoma of the hypopharynx and/or cervical esophagus at Akita University Hospital, Japan. We then used sound spectrography to analyze and compare the voices of patients receiving Kawahara's voice restoration, against healthy volunteers and patients who underwent the same surgery without voice restoration and spoke using an electronic larynx. We also evaluated the intelligibility of conversation and performed a listening test. The sound spectrograms showed that when produced by the electronic larynx, consonant sounds and voice frequencies below 300 Hz were not clearly recognized. By contrast, in patients who received Kawahara's surgical voice restoration, consonant and vowel sounds at frequencies above and below 300 Hz were clearly recognized. Although conversation was intelligible with both Kawahara's surgical voice restoration and the electronic device, listeners judged the voice produced by the former to be superior. Thus, the voice produced by Kawahara's surgical voice restoration is superior to that produced by the electronic larynx.

Aged↗
PubMed1996

Crying in separated and non-separated newborns: sound spectrographic analysis.

During the first 1-2 h after birth crying occurs during separation from the mother and stops on reunion. In rats, such "separation distress calls" have distinct phonetic properties. We examined this early crying by sound spectrography in 29 healthy, full-term, vaginally delivered babies, randomly assigned either to be kept in a cot or to be placed in body contact with the mother during the 90 min following birth. The former babies cried almost 10 times more than the latter ones. The duration of the cry signal (the smallest element of a cry analysed by spectrography) in both groups was 0.8-09s; the melody contour was flat or slightly rising--falling with a fundamental frequency of around 500 hertz. The cry is provisionally characterized as a discomfort cry, elicited mainly by separation from the mother.

Animals↗
PubMed1980

[Spectrographic analysis of the crying of infants with laryngeal disorders].

Twenty induced pain cries from the same number of infants with laryngeal disorders (infectious laryngitis, laryngomalacia, recurrens paresis and subglottic stricture) have been analyzed by means of sound spectrography. For each cry 21 phonetical cry features have been evaluated. This cry material was then compared with 120 pain cries from healthy infants. In the pathological group a significant increase could be noted in the occurrence of the following cry attributes: second pause, abnormal melody types, instability of the fundamental frequency, biphonation, vibrato, half-voiced voice quality, and inspiratory stridor. Furthermore, a significant decrease could be noticed in the occurrence of voiceless voice quality and glottal roll. For the other cry parameters no significant differences have been observed. In the light of these findings, the neuropathognomic significance, which has been up to now attached to such spectrographic features as very high maximum pitch, biphonation, gliding, and abnormal melody type, should not be taken too strictly. Moreover, one may conclude that the actual state of cry spectrography does not permit us to regard such parameters as instability of the fundamental frequency and noise concentration as indicators of neurologic disorders. On the other hand, the features inspiratory stridor, vibrato and tonal pit seem, to be to a certain extent typical of peripheral diseases of the vocal tract.

Crying↗
PubMed1995

Estimation of formant frequencies in infant cry.

The formant frequencies (F1, F2, F3) of normal infant crying were measured using three different estimation techniques: sound spectrography, linear predictive coding (LPC), and power spectrum analysis. Results found all three techniques to be highly similar for estimation of F1. However, the techniques differed significantly in the estimation of F2 and F3. Power spectrum analysis tended to yield the highest F2 and F3 values, while LPC consistently provided the lowest F2 and F3 values. Based on the results of the study, serious questions arise whether formant estimates of cry are accurate or appropriate for use as a metric of infant vocal tract resonance.

Acoustics↗
PubMed1984

Sound spectrographic cry analysis of infants with hydrocephalus.

Altogether 248 cries from 62 infants with hydrocephalus were analysed by sound spectrography: 92 cries from infants with congenital hydrocephalus and 52 cries from each of the groups with cerebral malformations, hydrocephalus as sequelae of meningitis, and after closure of a meningomyelocele. The cries were compared with 104 cries of normal healthy infants of corresponding age. The cry analysis showed that the most abnormal cries were seen in infants with congenital hydrocephalus and cerebral malformations. The pitch of the fundamental frequency did not differ from normal crying in cries of infants collected after recovery from meningitis and after closure of a meningomyelocele. The cries in hydrocephalus after meningitis showed more commonly flat melody types and the occurrence of bi-phonation.

Crying↗
PubMed1991

Misarticulation caused by abnormal lingual-palatal contact in patients with cleft palate with adequate velopharyngeal function.

Misarticulations produced by three patients with cleft palate (2 isolated cleft palate; 1 unilateral cleft lip, alveolus, and palate) who attained adequate velopharyngeal function and normal palatal vault by early surgical repairs were examined using electropalatography (EPG) and sound spectrography (SG). Common characteristics of lingual-palatal contact in which the contact area was broader and/or was more posterior than normal were observed. These misarticulations can be divided into three types based on the direction of the breath emission: palatalized misarticulation (in which air passes along the midline of the palate), lateral misarticulation (in which air flows laterally through the occluded dental arch), and nasopharyngeal misarticulation (in which air flows out the nose). These three are considered to be similar to intractable posterior pattern of articulation in cleft palate patients previously reported. However, these types of misarticulations can be produced by cleft patients who have achieved adequate velopharyngeal function and normal palatal vault.

Articulation Disorders↗