Showing papers on "Spectrogram published in 1976"

A real time spectrograph with implications for speech training for the deaf

Abstract: A real-time speech spectrograph has been developed which is practical for clinical use. It produces and stores a frequency-time-intensity display on a video monitor while the sound is being spoken. The display closely resembles a conventional, broad-band spectrogram in time, frequency and grey scale resolution. Preliminary evaluations have been made to show its usefulness 1. as an aid to the therapist in diagnosis and communication of concepts, and 2. for student drill relatively independent from the therapist. These results suggest that the instrument has considerable potential for training speech production with deaf.

On Generating Walsh Spectrograms

Abstract: A simple method for generating a class of time-sequency-amplitude plots called Walsh spectrograms is presented. A Fortran computer program which enables one to generate such spectrograms readily is provided. Illustrative examples related to generating spectro-grams associated with pulse-code modulation and speech data are included.

Measuring pitch and formant frequencies for a speech understanding system

Abstract: We present new techniques for the measurement of pitch period and formant frequencies. Individual pitch periods are estimated by finding local maxima in the power spectrum averaged over a frequency band that includes a formant. A spectral analysis is then performed for each pitch period over a data interval that is of shorter duration than the estimated pitch period. The pitch synchronous spectral analysis followed by post detection smoothing - preferably carried out over both time and frequency - leads to a spectrogram from which formant trajectories can be estimated by simple algorithms.

An attempt of automatic recognition of some Russian words

Abstract: A hierarchially organized computing recognition system is described. The primary dynamlc spectrogram is obtained by means of 23 1/3 - octave filters. The algorithms of the lowest recognising levels deal with finding out the phonetic features in the spectrogram. At the highest recognizing levels the nonunanimous string of phoneme codes is converted by the lexical algorithm into the sequence of words of the restricted vocabulary. The grammatical and semantical algorithms select those of them which are in accordance with the rules of the phrase construction. 150 Russian words pronounced isolatedly and in simple phrases have been recognized by the computing system with 90% effectiveness.

Real-time information reduction in digital sound spectograms of speech

Abstract: A new method has been employed in order to reduce the loss of relevant information while converting digital sound spectrograms into their two-level representations. The method involves a threshold which is adaptively adjusted in time as well as in frequency. When compared with other reported attempts, the resulting binary spectrograms yield much more reliable indications of formants, formant transitions, turbulences, bursts, etc. Moreover, a feasible digital hardware solution of a simplified matrix processor is shown to be sufficient for the real-time computation of the binary spectrograms.