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| Number | Title | Issue Date |
| 6549884 | Phase-vocoder pitch-shifting A system for pitch-shifting an audio signal wherein resampling is done in the frequency domain. The system includes a method for pitch-shifting a signal by converting the signal to a frequency domain representation and then identifying a specific region i... | 04/15/2003 |
| 6539357 | Technique for parametric coding of a signal containing information In a communications system, parametric coding in accordance with the invention is implemented to generate a representation of a stereo audio signal, which is composed of a left channel signal (L) and a right channel signal (R). To efficiently utilize tran... | 03/25/2003 |
| 6532445 | Information processing for retrieving coded audiovisual data In order to efficiently retrieve AV data by using signal characteristics as retrieval conditions, in a first step, a comparison and determination section computes a correlation coefficient (degree of similarity) of a spectrum coefficient of coded audio da... | 03/11/2003 |
| 6529868 | Communication system noise cancellation power signal calculation techniques In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power ban... | 03/04/2003 |
| 6529866 | Speech recognition system and associated methods A method and system for converting a sound signal containing a speech component and a noise component into recognizable language are disclosed, wherein the sound signal is transformed from a time domain into a frequency domain. Next the transformed signal... | 03/04/2003 |
| 6526384 | Method and device for limiting a stream of audio data with a scaleable bit rate Generating a bit rate scalable audio data stream is applicable in the field of data communications, and is based on the problem of providing a process and a device which can be used in a versatile manner and which have a high degree of flexibility with re... | 02/25/2003 |
| 6526378 | Method and apparatus for processing sound signal A method and an apparatus for processing a sound signal are provided, which process an input sound signal including degraded sound such as quantization noise so as to make the degraded sound subjectively unperceptible. A transformation strength controller... | 02/25/2003 |
| 6510408 | Method of noise reduction in speech signals and an apparatus for performing the method A method and apparatus for noise reduction in a speech signal wherein a first spectrum is generated on the basis of the speech signal and a second spectrum is generated as an estimate of the noise power spectrum. A third spectrum is generated by performin... | 01/21/2003 |
| 6510409 | Intelligent discontinuous transmission and comfort noise generation scheme for pulse code modulation speech coders A fully backward compatible intelligent discontinued transmission (DTX) and comfort noise generation (CNG) scheme that is operable in pulse code modulation (PCM) speech coding systems. The scheme, for example, provides a speech encoder comprising a speech... | 01/21/2003 |
| 6493668 | Speech feature extraction system A system suitable for use in a speech recognition system or other voice processing system extracts features related to the frequency and amplitude characteristics of an input speech signal using a plurality of complex band pass filters by processing the o... | 12/10/2002 |
| 6487529 | Audio processing device, receiver and filtering method for filtering a useful signal and restoring it in the presence of ambient noise An audio processing device includes an analyzer and a filter. The analyzer extracts an envelope of a noise signal and derives therefrom noise envelope parameters. The filter has coefficients which vary in response to noise envelope parameters and filters ... | 11/26/2002 |
| 6477490 | Audio signal compression method, audio signal compression apparatus, speech signal compression method, speech signal compression apparatus, speech recognition method, and speech recognition apparatus An audio signal compression apparatus for compressively coding an input audio signal comprises a time-to-frequency transformation unit for transforming the input audio signal to a frequency domain signal; a spectrum envelope calculation unit for calculati... | 11/05/2002 |
| 6477489 | Method for suppressing noise in a digital speech signal A spectral subtraction is effected including: a first subtraction step in which overestimates of the spectral component of the noise are taken into account, to obtain spectral components of a first noise-suppressed signal; the computation of a masking cur... | 11/05/2002 |
| 6473732 | Signal analyzer and method thereof A signal analyzer (303) and method thereof using short-time signal analysis, preferably recursive, to obtain a time variant feature from a signal, the signal analyzer including a signal sampler (401) with an input register (403) for storing a sequence of ... | 10/29/2002 |
| 6470310 | Method and system for speech encoding involving analyzing search range for current period according to length of preceding pitch period Processing for producing encoded output representing information about a pitch period of an input speech signal is performed. The pitch period of a previously entered speech signal is stored in a buffer. A search range-determining portion determines a ran... | 10/22/2002 |
| 6456964 | Encoding of periodic speech using prototype waveforms A method and apparatus for coding a quasi-periodic speech signal. The speech signal is represented by a residual signal generated by filtering the speech signal with a Linear Predictive Coding (LPC) analysis filter. The residual signal is encoded by extra... | 09/24/2002 |
| 6449592 | Method and apparatus for tracking the phase of a quasi-periodic signal A method for tracking the phase of a quasi-periodic signal includes the steps of estimating the phase of the signal for frames during which the signal is periodic, monitoring the performance of the estimated phase with a closed-loop performance measure, a... | 09/10/2002 |
| 6448909 | Analog continuous wavelet transform circuit An analog continuous wavelet transform circuit is implemented using a bank of quadrature voltage controlled oscillators (VCOs) and a bank of synchronous receivers. The synchronous receivers act as a bandpass filter bank, the center frequency of each synch... | 09/10/2002 |
| 6434519 | Method and apparatus for identifying frequency bands to compute linear phase shifts between frame prototypes in a speech coder A method and apparatus for identifying frequency bands to compute linear phase shifts between frame prototypes in a speech coder includes partitioning the frequency spectrum of a prototype of a frame by dividing the frequency spectrum into segments, assig... | 08/13/2002 |
| 6430529 | System and method for efficient time-domain aliasing cancellation The invention comprises an efficient system and method for performing the modified discrete cosine transform (MDCT) in support of time-domain aliasing cancellation (TDAC) perceptive encoding compression of digital audio. In one embodiment, an AC-3 encoder... | 08/06/2002 |
| 6424937 | Fundamental frequency pattern generator, method and program According to this fundamental frequency generating method, a fundamental frequency pattern is set from a data base of a fundamental frequency pattern of each accent phrase standardized by the phoneme time length or the time length of the vowel and the vow... | 07/23/2002 |
| 6421637 | Pitch shifting apparatus and method In a pitch shifting method, an input sound signal is stored into a memory, and a period of the input sound signal is extracted. Then, a sawtooth wave is produced whose amplitude is set to a value which is integer times the extracted period. A read address... | 07/16/2002 |
| 6421636 | Frequency converter system An apparatus and method is disclosed for converting an input signal having frequency related information sustained over a first duration of time into an output signal sustained over a second duration of time at substantially the same first frequency by ad... | 07/16/2002 |
| 6415251 | Subband coder or decoder band-limiting the overlap region between a processed subband and an adjacent non-processed one If all original subbands are not selected for processing in conventional subband coders or decoders aliasing distortion is generated by the characteristics of their subband band-splitting filters or subband band synthesis filters. To improve sound quality... | 07/02/2002 |
| 6405163 | Process for removing voice from stereo recordings A method and apparatus for removing or amplifying voice or other signals panned to the center of a stereo recording utilizes frequency domain techniques to calculate a frequency dependent gain factor based on the difference between the frequency domain sp... | 06/11/2002 |
| 6384759 | Method and apparatus for sample rate pre-and post-processing to achieve maximal coding gain for transform-based audio encoding and decoding The invention relates to a method and apparatus for achieving maximal coding gain for audio transmission. More particularly, at a chosen sample rate and frequency range value, an audio input signal is downsampled to the sample rate, encoded and transmitte... | 05/07/2002 |
| 6377914 | Efficient quantization of speech spectral amplitudes based on optimal interpolation technique A speech coding algorithm interpolates groups speech frames into speech frame pairs, and quantizes each frame of the pair according to a different algorithm. The spectral amplitudes of the second frame are quantized by dividing them into two portions and ... | 04/23/2002 |
| 6370507 | Frequency-domain scalable coding without upsampling filters In a method of coding discrete time signals (X1) sampled with a first sampling rate, second time signals (x2) are generated using the first time signals having a bandwidth corresponding to a second sampling rate, with the second samp... | 04/09/2002 |
| 6363345 | System, method and apparatus for cancelling noise A threshold detector precisely detects the positions of the noise elements, even within continuous speech segments, by determining whether frequency spectrum elements, or bins, of the input signal are within a threshold set according to current and future... | 03/26/2002 |
| 6358056 | Method for adaptively training humans to discriminate between frequency sweeps common in spoken language A method for adaptively training a human subject to process, and to distinguish between, similar acoustic events that are common in spoken language is provided. The method utilizes sequences of up/down frequency sweeps, of varying frequency and duration, ... | 03/19/2002 |
| 6356067 | Wide band signal analyzer with wide band and narrow band signal processors A wide band signal analyzer includes a frequency converter for converting a signal under test to an intermediate frequency signal. A narrow band signal processor receives the intermediate frequency signal and produces a first digital signal representing a... | 03/12/2002 |
| 6351729 | Multiple-window method for obtaining improved spectrograms of signals There is disclosed a method for processing a time-varying signal to produce a high-resolution spectrogram that represents power as a function of both frequency and time. Data blocks of a time series, which represents of a sampled signal, are subjected to ... | 02/26/2002 |
| 6349277 | Method and system for analyzing voices It is to assign proper pitch marks to voice waveforms, thereby to obtain smoothly synthesized voices and to control pitches of voices very accurately according to pitch marks of recorded messages. Any one of the fixed low-pass filters 3002-a to 3002-d is set s... | 02/19/2002 |
| 6338036 | Confirmation notification by apparatus using audio recognition as to the acceptability of an input sound When a sound which is to be recognized is input to a device, this invention briefly informs the user of whether the sound has been input in an appropriate state. A sound inputting part which outputs a sound to be recognized, spoken by a user as a pluralit... | 01/08/2002 |
| 6321195 | Speech recognition method The present invention relates to an automated dialing method for mobile telephones. According to the method, a user enters a telephone number via the keypad of the mobile phone, followed by speaking a corresponding codeword into the handset. The voice sig... | 11/20/2001 |
| 6304846 | Singing voice synthesis A method of singing voice synthesis uses commercially-available MIDI-based music composition software as a user interface (13). The user specifies a musical score and lyrics; as well as other music control parameters. The control information is stored in ... | 10/16/2001 |
| 6304843 | Method and apparatus for reconstructing a linear prediction filter excitation signal An apparatus and method of reconstructing a linear prediction synthesis filter excitation signal, by: receiving a signal representative of output from a linear prediction synthesis filter, producing therefrom a deterministic signal comprising a magnitude ... | 10/16/2001 |
| 6292520 | Noise Canceler utilizing orthogonal transform A noise canceler according to the invention orthogonally transforms a noise frame by means of an FFT and sorts its transform coefficients into N groups by means of a group by group basic reduction value determining section. Then, it compares the mean valu... | 09/18/2001 |
| 6278971 | Phase detection apparatus and method and audio coding apparatus and method An apparatus and procedure for performing phase detection in which one-pitch cycle of an input signal waveform is cut out on a time axis. The cut-out one pitch cycle is filled with zeroes to form 2N samples (where N is an integer, 2N... | 08/21/2001 |
| 6272465 | Monolithic PC audio circuit A monolithic integrated circuit for providing enhanced audio performance in personal computers. The monolithic circuit includes a wavetable synthesizer; a full function stereo coding and decoding circuit including analog-to-digital and digital-to-analog c... | 08/07/2001 |
