| 1. |
- Blomberg, Mats, et al.
(författare)
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A device for automatic speech recognition
- 1982
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Konferensbidrag (refereegranskat)abstract
- This paper is a translation of a paper originally published in the proceedings of the 1982 meeting of "Nordiska akustistka sällskapet" (The Nordic Acoustical Society), pp. 383-386. 2 DESCRIPTION OF THE RECOGNITION SYSTEM
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| 2. |
- Blomberg, Mats, et al.
(författare)
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Auditory models and isolated word recognition
- 1983
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Ingår i: STL-QPSR. ; 24:4, s. 1-15
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Tidskriftsartikel (refereegranskat)abstract
- A straightforward isolated word recognition system has been used to test different auditory models in acoustic front end processing. The models include BARK, PHON and SONE. The PHONTEMP model is based on PHON but also includes temporal forward masking. We also introduce a model, DOMIN, which is intended to measure the dominating frequency at each point along the 'basilar membrane.' All the above models were derived from an FFT-analysis, and the FFT processing is also used as a reference model. One male and one female speaker were used to test the recognition performance of the different models on a difficult vocabulary consisting of 18 Swedish consonants and 9 Swedish vowels. The results indicate that the performance of the models decreases as they become more complex. The overall recognition accuracy of FFT is 97% while it is 87% for SONE. However, the DOMIN model which is sensitive to dominant frequencies (formants) performs very well for vowels.
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| 3. |
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| 4. |
- Blomberg, Mats, et al.
(författare)
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Auditory models in isolated word recognition
- 1984
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Konferensbidrag (refereegranskat)abstract
- A straightforward isolated word recognition system has been used to test different auditory models in acoustic front end processing. The models include BARK, PHON and SONE. The PHONTEMP model is based on PHON but also includes temporal forward masking. We also introduce a model, DOMIN, which is intended to measure the dominating frequency at each point along the 'basilar membrane.' All the above models were derived from an FFT-analysis, and the FFT processing is also used as a reference model. One male and one female speaker were used to test the recognition performance of the different models on a difficult vocabulary consisting of 18 Swedish consonants and 9 Swedish vowels. The results indicate that the performance of the models decreases as they become more complex. The overall recognition accuracy of FFT is 97% while it is 87% for SONE. However, the DOMIN model which is sensitive to dominant frequencies (formants) performs very well for vowels.
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| 5. |
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| 6. |
- Blomberg, Mats, et al.
(författare)
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Effects of emphasizing transitional or stationary parts of the speech signal in a discrete utterance recognition system
- 1982
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Konferensbidrag (refereegranskat)abstract
- A pattern matching word recognition system has been modified in order to emphasize the transient parts of speech in the similarity mesure. The technique is to weight the word distances with a normalized spectral change function. A small positive effect is measured. Emphasizing the stationary parts is shown to substantially decrease the performance. Adding the time derivative of the speech parameters to the word patterns improves performance significantly. This is probaly a consequence of an improvement in the description of the transient segments.
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| 7. |
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| 8. |
- Blomberg, Mats, et al.
(författare)
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Let your voice do the dialing
- 1983
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Ingår i: Telephony. - 0040-2656 .- 2161-8690. ; , s. 68-74
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Tidskriftsartikel (refereegranskat)
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| 9. |
- Blomberg, Mats, et al.
(författare)
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Nonlinear Frequency Warp for Speech Recognition
- 1986
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Konferensbidrag (refereegranskat)abstract
- A technique of nonlinear frequency warping has been investigated for recognition of Swedish vowels. A frequency warp between two spectra is computed using a standard dynamic programming algorithm. The frequency distance, defined as the area between the obtained warping function and the diagonal, is contributing to the spectral distance. The distance between two spectra is a weighted sum of the warped amplitude distance and the frequency distance. By changing two weights, we get a gradual shift between non-warped amplitude distance, warped amplitude distance, and frequency distance. In recognition experiments on natural and synthetic vowel spectra, a metric combining the frequency and amplitude distances gave better results than using only amplitude or frequency deviation. Analysis of the results of the synthetic vowels show a reduced sensitivity to voice source and pitch variation. For the natural vowels, the recognition improvement is larger for the male and female speakers separately than for the combined groups.
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| 10. |
- Blomberg, Mats, et al.
(författare)
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Some current projects at KTH related to speech recognition
- 1986
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Konferensbidrag (refereegranskat)abstract
- Understanding and modelling the human speech understanding process requires knowledge in several domains, from auditory analysis of speech to higher linguistic processes. Integrating this knowledge into a coherent model is not the scope of this paper. Rather we want to present some projects that may add to the understanding of some components that eventually could be built into a knowledge-based speech recognition system. One project is concerned with a framework to formulate and experiment w i t h the earlier levels of speech analysis. Others deal with different kindsof auditory representationsand methods for comparing speech sounds. S t i l l another project studies the p h e t i c and ortbgraphic properties of different European languages.
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