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R Carrat

Publications and source records attributed to R Carrat.

8 recordsLinked to original sources
PubMed1992

[Vocal audiometry: the "phonatome" recognition test. Principle, technique, initial results].

Whereas tonal audiometry makes it possible to analyze the elementary deficits of hearing, vocal audiometry enables an overall synthetic assessment of these deficits. The vocal material usually used is composed of lists of sentences, words, logatomes or even phonemes. The authors suggest resorting to lists of phonetically balanced phonatomes or diphonemes. Among the advantages this technique offers, are the rapidity of the test, the excellent representativity of the most informative acoustic components of speech and the elimination of the extralinguistic factors of speech recognition.

Audiometry, Speech↗
PubMed1976

[Response of a membrane in a cochlear model to continuous and transient sounds].

Using enlarged mechanical models of the cochlea and true stimuli sinusoidal or transient, the authors give photographics documents which point out in objective way the "basilar" membrane responses. With pure tones, the membrane vibrates along its entire length no matter what the frequency. With transients, there is a maximum displacement in varying sites but always near the base.

Acoustic Stimulation↗
PubMedDate not supplied

[Assessment of acuteness of hearing using white noise. A comparison with classical audiometry in 357 cases of deafness].

From statistics of 357 cases of deafness it would appear that figures for white noise threshold are practically identical with those for global auditory loss of hearing calculated by means of tonal audiograms according to the usual 5 criteria. Measurement of white noise threshold is a quick and simple method of assessing acuteness of hearing. By bringing into play the whole of the auditory field, it is the equivalent of a real functional investigation of the ear. Furthermore, it is comparable to tonal audiometry in its use of complex sounds but without the disadvantage of relying on intelligibility. In conclusion, the authors suggest a mathematical interpretation to confirm these results.

Adolescent↗
PubMedDate not supplied

[Auditory threshold for white noise].

The liminal auditory threshold for white noise and for coloured noise was determined from a statistical survey of a group of 21 young people with normal hearing. The normal auditory threshold for white noise with a spectrum covering the whole of the auditory field is between -- 0.57 dB +/- 8.78. The normal auditory threshold for bands of filtered white noise (coloured noise with a central frequency corresponding to the pure frequencies usually employed in tonal audiometry) describes a typical curve which, instead of being homothetic to the usual tonal curves, sinks to low frequencies and then rises. The peak of this curve is replaced by a broad plateau ranging from 750 to 6000 Hz and contained in the concavity of the liminal tonal curves. The ear is therefore less sensitive but, at limited acoustic pressure, white noise first impinges with the same discrimination upon the whole of the conversational zone of the auditory field. Discovery of the audiometric threshold for white noise constitutes a synthetic method of measuring acuteness of hearing which considerably reduces the amount of manipulation required.

Adolescent↗
PubMedDate not supplied

[Cochlear mechanics: new experimental data (author's transl)].

The goal of this research is to confirm or disprove the presently accepted theories concerning the cochlear mechanism using: -- enlarged mechanical models of the cochlea, reproducing the known anatomy as accurately as possible, -- true sinusoidal stimuli or transient, -- objective documents (photographs and films).

Cochlea↗