94 results about "Pitch Frequency" patented technology

Successive pitch periods/frequencies are accurately determined in an audio equivalent signal. Using a suitable conventional pitch detection technique, an initial value of the pitch frequency/period is determined for so-called pitch detection segments of the audio equivalent signal. Based on the determined initial value, a refined value of the pitch frequency/period is determined. To this end, the signal is divided into a sequence of pitch refinement segments. Each pitch refinement segment is associated with at least one of the pitch detection segments. The pitch refinement segments are filtered to extract a frequency component with a frequency substantially corresponding to an initially determined pitch frequency of an associated pitch detection segment. The successive pitch periods/frequencies are determined in the filtered signal.

An apparatus and method for deciding an adaptive noise level for bandwidth extension are provided. The apparatus includes a noise level decider for deciding a high-band noise level for bandwidth extension according to tonality of an input signal, a pitch frequency analyzer for detecting a pitch frequency of the input signal and analyzing correlation between the detected pitch frequency and a frequency channel, and a noise level controller for adaptively controlling the decided high-band noise level based on the analyzed correlation of the pitch frequency and the frequency channel.

The invention relates to a speaker recognition method for filtering the emotional tone by using pitch envelop. In the test for speaker recognition, the mutually corresponding cepstrum features and pitch frequency which are firstly extracted from a segment of tone; the gender information is obtained by testing on the gender model which is trained in advance according to the cepstrum features; the thresholds adopted in the method for filtering the emotional tone are determined by gender information; the pitch envelope is picked out according to the thresholds, and then the cepstrum features are filtered according to the serial number of each frame in pitch envelope, thus acquiring the processed cepstrum features; finally, the GMM system test is carried out on the processed cepstrum features.The beneficial effects of the invention are as follows: the inconvenience to the system which needs providing the emotional tone of the speaker in the training or the emotion information of the speech in the test in a traditional method is eliminated, and the recognition performance is increased by 8% compared with traditional ASR system.

There is provided a low-frequency-band voice reconstructing device. A voice signal from which a signal in a low-frequency band is removed is inputted to the device and the device reconstructs the signal in the low frequency band based on the input voice signal. The device comprises a first portion for extracting part of harmonic components of a pitch signal of voice from the input voice signal, a second portion for squaring a signal extracted by the first portion, a third portion for extracting a signal of a pitch frequency and harmonic signals of a lower limit frequency or below of the input voice signal, from the signal obtained by the second portion, and a fourth portion for correcting an amplitude level of the signal extracted by the third portion.

A pitch frequency estimation device capable of estimating a pitch frequency precisely while reducing the computational complexity required for the estimation of the pitch frequency. In this device, a spectrum extraction unit (104) extracts a pitch-harmonized spectrum from a voice spectrum. A spectral average calculation unit (106) calculates the average of the power of the pitch-harmonized spectra extracted by the spectrum extraction unit (104), in a manner to individually correspond to a plurality of pitch frequency candidates. An estimation unit estimates the pitch frequency by using the average valve calculated by the spectral average calculation unit (106).

An improved method and arrangement for altering musical dynamics of a sound S included in a sound signal is disclosed. The altering of the musical dynamics is performed by filtering and amplification of the sound signal. The filtering is performed by the use of a parametric equalizer, the parametric equalizer having a first gain G₁ and a resonance frequency f, being related to a pitch frequency f_p of said sound S. The amplification is performed by an amplifier amplifying the sound signal with a second gain G₂, the second gain G₂ being dependent on the first gain G₁.

The invention discloses a distance blur clutter suppression method based on pitch frequency diversity STAP. The method comprises the steps that down-conversion and matched filtering are sequentially carried out on a detected received signal to sequentially acquire the pitch-azimuth-time three-dimensional clutter snapshot model of each range gate, the pitch frequency expression of each range gate and the corresponding clutter compensation item; an appropriate clutter compensation item is used to separate distance blur clutters of different distance rings; due to the fact that pitch frequencies of different distance blur clutters are separated from each other, the distance blur clutter of each distance ring needs a filter with corresponding coefficients for filtering, and then all distance blur clutters are inhibited to solve the problem of distance blur; and finally, after the pitch distance blur clutters are separated, pitch frequency spectrum distribution and digital frequency periodicity are used to acquire the selection criteria of frequency increment. According to the invention, the freedom of a system and the operation complexity are not increased.

Estimating a speech signal pitch frequency by determining a speech signal frame line spectrum including spectral lines having respective line amplitudes and frequencies, selecting a predefined number of spectral lines having highest amplitudes, fewer then the total number of the spectral lines, calculating a preliminary utility function over a pitch frequency range to provide a preliminary utility function value for each pitch frequency in the range measuring the compatibility of the selected spectral lines with the pitch frequency, identifying a predefined number of preliminary pitch frequency candidates at least partly responsive to the preliminary utility function, where each candidate is a local maximum of the preliminary utility function, calculating a final utility score for each of the candidates, and selecting any of the candidates to be an estimated pitch frequency of the speech signal at least partly responsive to any of the final utility scores.

The invention provides a voice extracting method and system and a voice audio playing method and device. The voice extracting method comprises the steps of extracting sound signals where voice and background sound exist jointly from the beginning position of original acoustical signals as a sample, detecting tonic tone from the sample, using the tonic tone as the reference frequency, and comparing the pitch frequency of sound belonging to the same sound source in the sound portion, except the sample, of the original acoustical signals with the reference frequency to determine whether the sound source is voice. The voice extracting method can conveniently extract voice from mixed voice frequency.

The invention discloses a method and device for extracting a pitch frequency of a sound and a readable storage medium. The method comprises a step of obtaining a sound signal to be detected and transforming the sound signal to be detected from time domain to frequency domain by a short-time Fourier transform, a step of determining a frequency band range of the sound signal to be detected from thefrequency domain and determining a maximum number of harmonics of the sound signal to be detected according to the frequency band range, a step of carrying out energy intensity detection on each frequency point within the frequency band range, and determining a frequency point a with a highest energy intensity according to an intensity detection result, and a step of judging whether a frequency point to be detected with a maximum point exists according to the frequency point a and the maximum number of harmonics, wherein the frequency point to be detected may be a pitch frequency of the soundsignal to be detected or a harmonic component of the pitch frequency if the frequency point to be detected with a maximum point exists, and finally extracting the pitch frequency from the sound signalto be detected. According to the method for extracting a pitch frequency of a sound provided by the invention, the high accuracy can be realized by using low algorithm complexity.

A personal care implement comprises a head and a handle, the head being repeatedly attachable to and detachable from the handle. The personal care implement exhibits a sound when the head gets attached to or detached from the handle, thereby providing a signal of secure attachment or detachment. The sound is characterized by a tonal component of about 4000 Hz to about 6000 Hz, preferably over a time length of about 0.1 s to about 0.3 s, on a tonality frequency vs. time analysis.

The read-back signal from a HDD head is demodulated to find the pitch frequency of the head, which can be compared to a baseline value to determine if it has increased, indicating a possible failure due to contamination or lubricants pick up. Or, the pitch frequency can be used during manufacturing of a burnished pad head to determine when burnishing has been completed.

The invention discloses a detection platform for a variable pitch frequency converter of a variable pitch system. The detection platform comprises a PC operation part and a testing part which are connected with the variable pitch frequency converter, wherein the testing part comprises a beckhoff module group, an enabling relay, a direct-current power supply, a direct-current voltmeter, an alternating current power supply, an alternating current voltmeter, a discharge resistor, another direct-current voltmeter connected with the discharge resistor in parallel, a motor and an alternating current ammeter, wherein the beckhoff module group and the enabling relay are connected with the frequency converter; the discharge resistor is used for discharging electric energy of a direct-current bus; the motor is connected with the variable pitch frequency converter; the alternating current ammeter is connected with the motor in parallel. The invention further discloses a detection device comprising the detection platform and a detection method for the variable pitch frequency converter of the variable pitch system. By simulating the normal situation and the special situation of the variable pitch system in a wind generator set in the practical operation process, the detection platform, the detection device and the detection method can be used for detecting the property of the variable pitch frequency converter comprehensively; the working state of the frequency converter is displayed through a triggering signal and a feedback signal; the electric characteristics of the frequency converter are detected through data measured by using digital voltmeters/ammeters, and further hidden dangers can be eliminated and the repairing quality of a product is improved.