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Communications, Speech and Vision, IEE Proceedings I

Issue 2 • Date Apr 1989

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Displaying Results 1 - 10 of 10
  • Large vocabulary isolated word recognition: a real-time implementation

    Publication Year: 1989 , Page(s): 127 - 132
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (532 KB)  

    A large vocabulary realtime isolated word recognition system (DSPELL) is presented. Although the final goal of the project is to recognise words from a vocabulary whose size is of the order of 10-20 thousand, the present system is intended to perform real-time recognition on vocabulary subsets (cohorts) of up to two thousand words. The system is implemented on Elsag's multiprocessor EMMA-2 for a f... View full abstract»

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  • Harmonic postprocessing of speech synthesised by stochastic coders

    Publication Year: 1989 , Page(s): 141 - 144
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (420 KB)  

    High quality speech coding at medium-to-low bit rates is presently one of the major goals in speech research. Stochastic coding represents an important step towards this objective. Yet, the quality of synthetic speech is still not always good enough. A subjectively important part of the distortion may arise from imperfect reproduction of voiced regions, where the harmonic structure is not was well... View full abstract»

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  • Recognition of speaker-dependent continuous speech with KEAL

    Publication Year: 1989 , Page(s): 145 - 154
    Cited by:  Papers (1)  |  Patents (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (900 KB)  

    A description of the speaker-dependent continuous speech recognition system KEAL is given. An unknown utterance is recognised by means of the following procedures: acoustic analysis, phonetic segmentation and identification, word and sentence analysis. The combination of feature-based speaker-independent coarse phonetic segmentation with speaker-dependent statistical classification techniques is o... View full abstract»

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  • Hamlet: a prototype of a voice-activated typewriter

    Publication Year: 1989 , Page(s): 162 - 166
    Cited by:  Patents (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (416 KB)  

    This project integrates different parts of a speaker-dependent isolated word voice-activated typewriter on a personal computer (IBM PC-AT). To build up the language model (for French), several routines have been written: automatic grapheme to phoneme conversion, semiautomatic training texts (20 pages) processing (building up the graphemic (2500 words) and phonemic (2000 words) lexicons), syntactic... View full abstract»

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  • Excitation synchronous formant analysis

    Publication Year: 1989 , Page(s): 110 - 118
    Cited by:  Papers (1)  |  Patents (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (872 KB)  

    Speech signals can be efficiently parametrised by the resonant frequencies of the vocal tract known as formants. The automatic analysis of the signal into a suitable set of formant parameters has however proved to be a difficult problem, particularly for female speech. The technique of excitation synchronous formant analysis has been proposed as an improved method of formant analysis. The authors ... View full abstract»

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  • Template adaptation in an isolated word-recognition system

    Publication Year: 1989 , Page(s): 119 - 126
    Cited by:  Patents (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (720 KB)  

    A template-based isolated word-recognition system, with adaptation of templates by weighted averaging with recognised input utterances, is described. Experiments with adaptation of speaker-specific and speaker-independent templates are reported. The results show substantial improvements in the recognition accuracies attained, and reveal the importance of applying a compensation technique which adj... View full abstract»

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  • Spoken-word recognition using dynamic features analysed by two-dimensional cepstrum

    Publication Year: 1989 , Page(s): 133 - 140
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (646 KB)  

    Two-dimensional cepstrum (TDC) analysis and its application to word and monosyllable recognition are described. The TDC can simultaneously represent several different kinds of information contained in the speech waveform: static and dynamic features, as well as global and fine frequency structure. Noise reduction and speech enhancement can be easily performed using the TDC. Using word and monosyll... View full abstract»

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  • CMOS processor for template-based speech-recognition system

    Publication Year: 1989 , Page(s): 155 - 161
    Cited by:  Patents (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (880 KB)  

    A special purpose CMOS signal processor for use in a speaker-dependent isolated word recognition system is described. The recognition is performed on the basis of pattern matching, i.e. the processor calculates the distances between the spoken word to be recognised and all the reference words stored in a template memory by means of the dynamic-time-warp algorithm. Operating at 10 MHz, the processo... View full abstract»

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  • Multilevel range/NEXT performance in digital subscriber loops

    Publication Year: 1989 , Page(s): 169 - 174
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (498 KB)  

    Presents some results on the range performance of multilevel signalling schemes in the presence of near-end crosstalk (NEXT) in the digital subscriber loop. With a data rate of 160 kbit/s at the U interface, multilevel line codes can be used to reduce the symbol rate and hence the bandwidth of the transmitted signal to yield improved performance in the crosstalk dominated environment, as this impa... View full abstract»

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  • Study of 1024-QAM system performance in the presence of filtering imperfections

    Publication Year: 1989 , Page(s): 175 - 179
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (388 KB)  

    For the transmission of a standard CEPT i.e. 2.048 Mbit/s rate digital transmission, in a 240 kHz supergroup band, a 1024-QAM (quadrature amplitude modulated) system employing raised cosine filters with an excess bandwidth of 17% is required. The performance of a 1024-WAM system in the presence of different filter imperfections is studied by means of computer simulation. To assess the effects of d... View full abstract»

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