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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 4837831 | Method for creating and using multiple-word sound models in speech recognition A first speech recognition method receives an acoustic description of an utterance to be recognized and scores a portion of that description against each of a plurality of cluster models representing similar sounds from different words. The resulting scor... | 06/06/1989 |
| 4827522 | Pattern recognition apparatus for determining a reference pattern by K-L expansion utilizing a power method Disclosed is a pattern recognition and learning apparatus which compares an input pattern with a reference patterns to recognize a category of the input pattern, and learns a reference pattern from input patterns of a specific category. Learning of input ... | 05/02/1989 |
| 4802224 | Reference speech pattern generating method A time series of spectral parameters is extracted from a learning speech, the spectral parameters are divided into a plurality of segments for each voice interval, and the segments are clustered into a plurality of clusters. For each cluster an initial re... | 01/31/1989 |
| 4797929 | Word recognition in a speech recognition system using data reduced word templates Described herein, is an arrangement and method for processing speech information in a speech recognition system (300). In such a system where the speech information is depicted as words, each word representing a sequence of frames (510) and where the reco... | 01/10/1989 |
| 4792976 | Pattern recognizing device with pattern matching in slant parallelogrammic blocks of widths dependent on classified reference pattern lengths On pattern matching an input pattern arranged along a first time axis to each concatenation of patterns selected from reference patterns and arranged along a second time axis with feature vectors of the input pattern and the concatenation placed at a comm... | 12/20/1988 |
| 4783804 | Hidden Markov model speech recognition arrangement Markov model speech pattern templates are formed for speech analysis systems by analyzing identified speech patterns to generate frame sequences of acoustic feature signals representative thereof. The speech pattern template is produced by iteratively gen... | 11/08/1988 |
| 4715004 | Pattern recognition system In speech recognition, an unknown input signal is analyzed for its feature pattern sequence Ai which is compared to prestored reference patterns grouped in categories. Each category m has a representative reference pattern Bm which r... | 12/22/1987 |
| 4672668 | Method and apparatus for registering standard pattern for speech recognition In order to produce and store a pattern of reference words for use in a speaker-dependent speech recognition system, the system prompts the operator of the system to speak standard words in a predetermined sequence. For this purpose, a prestored standard ... | 06/09/1987 |
| 4590605 | Method for production of speech reference templates In this speech recognition system, a set of templates for each phoneme includes clusters of speech patterns based on two speech features: "physical" features (formant spectra of men versus women) and "utterance" features (unvoiced vowels and nasalization)... | 05/20/1986 |
| 4454586 | Method and apparatus for generating speech pattern templates A system for generating speech pattern templates for use with either speech recognition or speech synthesis. Reference demisyllable templates are first generated from a reference first speaker using both manual and automatic analysis. The analysis for a s... | 06/12/1984 |
| 4363102 | Speaker identification system using word recognition templates In a speaker recognition and verification arrangement, acoustic feature templates are stored for predetermined reference words. Each template is a standardized set of acoustic features for one word, formed for example by averaging the values of acoustic f... | 12/07/1982 |
| 4181821 | Multiple template speech recognition system A speech analyzer for recognizing an unknown utterance as one of a set of reference words is adapted to generate a feature signal set for each utterance of every reference word. At least one template signal is produced for each reference word which templa... | 01/01/1980 |
