183 results about "Formant" patented technology

Intelligibility of a human voice projected by a loudspeaker in an environment of high ambient noise is enhanced by processing a voice signal in accordance with the frequency response characteristics of the human hearing system. Intelligibility of the human voice is derived largely from the pattern of frequency distribution of voice sounds, such as formants, as perceived by the human hearing system. Intelligibility of speech in a voice signal is enhanced by filtering and expanding the voice signal with a transfer function that approximates an inverse of equal loudness contours for tones in a frontal sound field for humans of average hearing acuity.

A micromachined design and method with inherent disturbance-rejection capabilities is based on increasing the degrees-of-freedom (DOF) of the oscillatory system by the use of two independently oscillating proof masses. Utilizing dynamical amplification in the 4-degrees-of-freedom system, inherent disturbance rejection is achieved, providing reduced sensitivity to structural and thermal parameter fluctuations and damping changes over the operating time of the device. In the proposed system, the first mass is forced to oscillate in the drive direction, and the response of the second mass in the orthogonal direction is sensed. The response has two resonant peaks and a flat region between peaks. Operation is in the flat region, where the gain is insensitive to frequency fluctuations. An over 15 times increase in the bandwidth of the system is achieved due to the use of the proposed architecture. In addition, the gain in the operation region has low sensitivity to damping changes. Consequently, by utilizing the disturbance-rejection capability of the dynamical system, improved robustness is achieved, which can relax tight fabrication tolerances and packaging requirements and thus result in reducing production cost of micromachined methods.

Generally, the present invention determines and uses spectral peak information, which preferably augments feature vectors and creates augmented feature vectors. The augmented feature vectors decrease errors in pattern recognition, increase noise immunity for wide-band noise, and reduce reliance on noisy formant features. Illustratively, one way of determining spectral peak information is to split pattern data into a number of frequency ranges and determine spectral peak information for each of the frequency ranges. This allows single peak selection. All of the spectral peak information is then used to augment a feature vector. Another way of determining spectral peak information is to use an adaptive Infinite Impulse Response filter to provide this information. Additionally, the present invention can determine and use incremental information. The incremental information is relatively easy to calculate and helps to determine if additional or changed features are worthwhile. The incremental information is preferably determined by determining a difference between mutual information (between the feature vector and the classes to be disambiguated) for new or changed feature vectors and mutual information for old feature vectors.

A method on a computing device is provided for enhancing the memory and cognitive ability of an older adult by requiring the adult to differentiate between rapidly presented stimuli. The method trains the time order judgment of the adult by presenting upward and downward frequency sweeps, in random order, separated by an inter-stimulus interval. The upward and downward frequency sweeps are at frequencies common in formants which form the frequency components common in speech. Icons are associated with the upward and downward frequency sweeps to allow the adult to indicate an order in which the frequency sweeps are presented (i.e., UP-UP, UP-DOWN, DOWN-UP, and DOWN-DOWN). Correct selection of an order causes the inter-stimulus interval to be reduced, and/or the duration of the frequency sweeps to be adaptively shortened.

A method (196) for providing speech therapy to a learner (30) utilizes a formant estimation and visualization process (28) executable on a computing system (26). The method (196) calls for receiving a speech signal (35) from the learner (30) at an audio input (34) of the computing system (26) and estimating first and second formants (136, 138) of the speech signal (35). A target (94) is incorporated into a vowel chart (70) on a display (38) of the computing system (26). The target (70) characterizes an ideal pronunciation of the speech signal (35). A data element (134) of a relationship between the first and second formants (136, 138) is incorporated into the vowel chart (76) on the display (38). The data element (134) is compared with the target (70) to visualize an accuracy of the speech signal (35) relative to the ideal pronunciation of the speech signal (35).

A method on a computing device for enhancing the memory and cognitive ability of a participant by requiring the participant to differentiate between rapidly presented aural stimuli. The method trains the time order judgment of the participant by iteratively presenting sequences of upward and downward formant frequency sweeps, in random order, separated by an inter-stimulus interval (ISI). The upward and downward formant frequency sweeps utilize frequencies common in formants, i.e., the characteristic frequency components common in human speech. Icons are associated with the upward and downward formant frequency sweeps to allow the participant to indicate an order in which the sweeps are presented (i.e., UP-UP, UP-DOWN, DOWN-UP, and DOWN-DOWN). Correct/incorrect selection of an order causes the ISI and/or the duration of the frequency sweeps to be adaptively shortened/lengthened. A maximum likelihood procedure may be used to dynamically modify the stimulus presentation, and/or, to assess the participant's performance in the exercise.

Method for improving speaker identification by determining usable speech. Degraded speech is preprocessed in a speaker identification (SID) process to produce SID usable and SID unusable segments. Features are extracted and analyzed so as to produce a matrix of optimum classifiers for the detection of SID usable and SID unusable speech segments. Optimum classifiers possess a minimum distance from a speaker model. A decision tree based upon fixed thresholds indicates the presence of a speech feature in a given speech segment. Following preprocessing, degraded speech is measured in one or more time, frequency, cepstral or SID usable/unusable domains. The results of the measurements are multiplied by a weighting factor whose value is proportional to the reliability of the corresponding time, frequency, or cepstral measurements performed. The measurements are fused as information, and usable speech segments are extracted for further processing. Such further processing of co-channel speech may include speaker identification where a segment-by-segment decision is made on each usable speech segment to determine whether they correspond to speaker #1 or speaker #2. Further processing of co-channel speech may also include constructing the complete utterance of speaker #1 or speaker #2. Speech features such as pitch and formants may be extended back into the unusable segments to form a complete utterance from each speaker.

The invention relates to a method for determining system time delay in acoustic echo cancellation and an acoustic echo cancellation method employing the method for determining system time delay in acoustic echo cancellation. The method for determining system time delay in acoustic echo cancellation comprises the following steps: overlapping, segmenting and windowing collected original signals and reference signals respectively, and transforming the collected original signals and reference signals respectively into frequency-domain signals through quick Fourier transformation to obtain original frequency-domain signals and reference frequency-domain signals; finding out frequency values corresponding to n peak values with the highest energy in the segmented original frequency-domain signals and reference frequency-domain signals, wherein the frequency values are formant characteristic values; next, sequentially moving the formant frequency sequences of the reference frequency-domain signals forwards by an integral multiple of segmentation time t1, and correspondingly comparing two formant characteristic values respectively, wherein the time delay of forward moving with the most similarities is the system time delay in acoustic echo cancellation. Compared with the prior art, the method can determine dynamic and extra-large system time delay only with a very small amount of calculation, and has a wide application range, a small amount of calculation and a stable effect.

A coding efficiency of coding spectral coefficients of a spectrum of an audio signal is increased by en/decoding a currently to be en/decoded spectral coefficient by entropy en/decoding and, in doing so, performing the entropy en/decoding depending, in a context-adaptive manner, on a previously en/decoded spectral coefficient, while adjusting a relative spectral distance between the previously en/decoded spectral coefficient and the currently en/decoded spectral coefficient depending on an information concerning a shape of the spectrum. The information concerning the shape of the spectrum may have a measure of a pitch or periodicity of the audio signal, a measure of an inter-harmonic distance of the audio signal's spectrum and/or relative locations of formants and/or valleys of a spectral envelope of the spectrum, and on the basis of this knowledge, the spectral neighborhood which is exploited in order to form the context of the currently to be en/decoded spectral coefficients may be adapted to the thus determined shape of the spectrum, thereby enhancing the entropy coding efficiency.

The invention relates to a computer real-time analysis system for singing and playing, comprising a segmental package-inspection device of an acoustical signal, a real-time recording, storing, displaying and playing device of acoustical signal time-domain data, a device for drawing time-frequency-intensity joint picture with fast Fourier transform for a short time, a device for drawing time-frequency real-time spectrum with fast Fourier transform for a short time, a device for recognizing fundamental tone, harmonic tone and resonance peak of sound, analysis processing and displaying, a devicefor rhythm recognition of the sound, analysis processing and displaying, a device for analyzing and sorting-out into an opern and displaying according to the information such as fundamental tone, libretto, rhythm and tuning systems; and a device for modifying, recording, storing, evaluating, displaying, playing and transmitting an acoustical time-domain and frequency-domain signal. The system carries out computer real-time visualization and systematical and quantitative measurement and test to vocal music and instrumental music, and sing state and playing state can be recognized and guided byadopting the computer image and video automatic recognition technology.

In one aspect, a method of processing a voice signal to extract information to facilitate training a speech synthesis model is provided. The method comprises acts of detecting a plurality of candidate features in the voice signal, performing at least one comparison between one or more combinations of the plurality of candidate features and the voice signal, and selecting a set of features from the plurality of candidate features based, at least in part, on the at least one comparison. In another aspect, the method is performed by executing a program encoded on a computer readable medium. In another aspect, a speech synthesis model is provided by, at least in part, performing the method.

The invention provides a resonance peak automatic matching method for voiceprint identification. The method comprises the following steps that: phoneme boundary positions in an inspection material and a sample in the voiceprint identification can be automatically marked through using continuous speech recognition-based forced alignment (FA) technology; as for identical vowel phoneme segments of the inspection material and the sample, whether a current phoneme is a valid analysable phoneme is automatically judged through using fundamental frequencies, resonance peaks and power spectrum density parameters; and deviation ratios of corresponding resonance peak time-frequency areas can be automatically rendered through using a dynamic time warping (DTW) algorithm and are adopted as analysis basis of final manual voiceprint identification. With the resonance peak automatic matching method for the voiceprint identification of the invention adopted, the boundaries of phonemes can be automatically marked, and whether the pronunciation of the phonemes is valid is judged, and therefore, processing efficiency can be greatly improved; and at the same time, an automatic resonance peak deviation alignment algorithm is performed on effective phoneme pairs, and therefore, the accuracy of resonance peak alignment can be improved.

A method of automated identification of specific sounds in a noise environment, comprising the steps of: a) continuously recording the noise environment, b) forming a spectral image of the sound recorded in a time/frequency coordinate system, c) analyzing time-sliding windows of the spectral image, d) selecting a family of filters, each of which defines a frequency band and an energy band, e) applying each of the filters to each of the sliding windows, and identifying connected components or formants, which are window fragments formed of neighboring points of close frequencies and powers, f) calculating descriptors of each formant, and g) calculating a distance between two formants by comparing the descriptors of the first formant with those of the second formant.

The invention discloses a method for converting emotional speech by combining rhythm parameters (fundamental frequency, time length and energy) with a tone parameter (a formant), which mainly comprises the following steps of: 1, carrying out extraction and analysis of feature parameters on a Beihang University emotional speech database (BHUDES) emotional speech sample (containing neutral speech and four types of emotional speech of sadness, anger, happiness and surprise); 2, making an emotional speech conversion rule and defining each conversion constant according to the extracted feature parameters; 3, carrying out extraction of the feature parameters and fundamental tone synchronous tagging on the neutral speech to be converted; 4, setting each conversion constant according to the emotional speech conversion rule in the step 2, modifying a fundamental frequency curve, the time length and the energy and synchronously overlaying fundamental tones to synthesize a speech signal; and 5, carrying out linear predictive coding (LPC) analysis on the speech signal in the step 4 and modifying the formant by a pole of a transfer function so as to finally obtain the emotional speech rich in expressive force.

Formant frequencies in a voiced speech signal are detected by filtering the speech signal into multiple frequency channels, determining whether each of the frequency channels meets an energy criterion, and determining minima in envelope fluctuations. The identified formant frequencies can then be enhanced by identifying and amplifying the harmonic of the fundamental frequency (F0) closest to the formant frequency.

Disclosed are a method for determining whether a person is drunk after consuming alcohol on the basis of a difference among a plurality of formant energy energies, which are generated by applying linear predictive coding according to a plurality of linear prediction orders, and a recording medium and a terminal for carrying out the method. The alcohol consumption determining terminal comprises: a voice input unit for receiving voice signals and converting same into voice frames and outputting the voice frames; a voiced/unvoiced sound analysis unit for extracting voice frames corresponding to a voiced sound from among the voice frames; an LPC processing unit for calculating a plurality of formant energy energies by applying linear predictive cording according to the plurality of linear prediction orders to the voice frames corresponding to the voiced sound; and an alcohol consumption determining unit for determining whether a person is drunk after consuming alcohol on the basis of a difference among the plurality of formant energy energies which have been calculated by the LPC processing unit, thereby determining whether a person is drunk after consuming alcohol depending on a change in the formant energy energies generated by applying linear predictive coding according to the plurality of linear prediction orders to voice signals.

The method includes following steps: when picking up parameters of frequency spectrum, the method considers difference between orders in line spectrum frequency as a part of picked up result; when modeling a model and training, carrying out independent modeling and training for line spectrum frequency and parameters of difference between orders; when making prediction, predicting line spectrum frequency and parameters of difference between orders respectively, and moreover carrying out adjustment for parameters of frequency spectrum by using difference between orders; finally, using adjusted parameters of frequency spectrum synthesizes output voice in order to reach purpose of raising tone quality of synthesized voice through enhancing and sharpening formant of synthesized voice.

A hearing aid comprising a frequency shifter (20) has means (22) for detecting a first frequency and a second frequency in an input signal. The frequency shifter (20) transposes a first frequency range of the input signal to a second frequency range of the input signal based on the presence of a fixed relationship between the first and the second detected frequency. The means (34, 35, 36) for detecting the fixed relationship between the first and the second frequency is used for controlling the frequency transposer (20). A speech detector (26) configured for detecting the presence of voiced and unvoiced speech is provided for suppressing the transposition of voiced-speech signals in order to preserve the speech formants. The purpose of transposing frequency bands in this way in a hearing aid is to render inaudible frequencies audible to a user of the hearing aid while maintaining the original envelope, harmonic coherence and speech intelligibility of the signal. The invention further provides a method for shifting a frequency range of an input signal in a hearing aid.