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95 results about "Normal speech" patented technology

Normal speech between two people typically has a range of 50 to 60 decibels. When two people are speaking in a public place with background noise, normal speech is louder, around five extra decibels.

Dual mode impulse noise protecting earplug (D-182)

A two piece dual mode earplug including an integrally molded elongated member having a nose end and an open rear end and a channel extending through the elongated member. An integrally molded insert member is formed with a base portion and a rod portion and with the rod portion seated within the open rear end of the elongated member. The insert member additionally includes an attenuation filter integrally molded as part of the rod portion and includes first and second openings located on each side of a chamber and with the size and length of the openings together with the chamber providing attenuation of impulse noise while allowing the passage of normal speech through the channel. The insert member also includes the base portion integrally molded to have a third opening larger than the first and second openings in the rod portion and with the first, second and third openings together forming a passageway through the insert member to the channel extending through the elongated member. The insert member further includes an integrally molded cap member and with the cap member having a plug portion of a size complementary to the third opening of the base member. The insertion of the plug portion into the third opening of the base portion seals off the third opening. The positioning of the cap member provides for the earplug being in a first mode of operation where the passageway is open and a second mode of operation where the passageway is closed.
Owner:MOLDEXMETRIC

Electro-larynx

InactiveUS7212639B1Improve approximationFacilitates production of substantially natural sounding speechTracheaeElectric controllersFrequency spectrumGlottis
An improved electro-larynx includes a linear transducer and / or an improved waveform generator. The improved electro-larynx sets up a sound wave within the pharynx of the user which closely approximates a normal glottal excitation. The linear transducer preserves the harmonic structure of a glottal source wave generated by the waveform generator and translates it into a vibration. The transducer includes an armature assembly, suspension assembly, and coupler disk coupled together to move in concert. The armature assembly vibrates as a function of the desired and input glottal source wave, which in turn causes an immediate and corresponding vibration of the coupler disk. The suspension assembly constrains armature movement to one dimension and provides additional compliance. The coupler disk includes a substantially flat surface suitable for engaging the surface of a user's throat and vibrates as a linear function of the input glottal source wave. The improved waveform generator produces a relatively good approximation of an actual glottal source waveform by preferably deriving it from actual voice data and having the effects of the modulation of the vocal tract removed. As a result, the harmonic structure of the glottal source waveform has overtones which drift in frequency, similar to normal glottal excitations. The waveform generator also allows user adjustment of the pitch and amplitude of the glottal source wave and smoothes out any distortions caused by the process of obtaining the glottal data used to generate the glottal source wave. The waveform generator bolsters the frequency response at the high end of the spectrum to compensate for any roll-off, yielding a frequency response spectrum of about 20–5 Khz. The responsiveness of the linear transducer allows the glottal source wave's pitch, amplitude, and harmonic structure to be communicated through the coupler disk and realistic glottal source waves to be transduced into the user's pharynx, resulting in the production of substantially normal speech.
Owner:CHARLES STARK DRAPER LABORATORY

Estimation method for fundamental frequency of Chinese whispered speech

The invention discloses an estimation method for the fundamental frequency of Chinese whispered speech. The estimation method concretely includes the steps that a whispered speech and normal speech database uniform in linguistic data is set up; LPCC parameters Lw of whispered speech, LPCC parameters Ln of normal speech and fundamental frequency parameters F0 are extracted, and DTW alignment is carried out according to Lw and Ln; F0 of the normal speech is divided within the range of 100-300 Hz at the interval of 5 Hz, and forty intervals are generated in total; aligned vectors are assigned to all the intervals according to F0 values of the normal speech, all whispered speech LPCC vectors in each interval are trained to be a GMM model, the combined vectors formed by all the whispered speech LPCC vectors and the F0 parameters of the normal speech in the corresponding interval are trained be to a GMM model to obtain an estimation function, and forty estimation functions are obtained in total; the LPCC parameters of the whispered speech are extracted and matched with all the GMM models to search for the optimum matching model, and then the F0 values of the whispered speech are estimated according to the estimation function of the model. The fundamental frequency of the whispered speech can be estimated, and the difficulty, caused by the loss of fundamental frequency information, of the Chinese whispered speech is effectively overcome.
Owner:SUZHOU UNIV
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