The recognition of all the 1302 Mandarin syllables is the key problem in large vocabulary Mandarin speech recognition. Because every Mandarin syllable is assigned a tone, when the differences in tones are disregarded, the total number of different syllables is reduced from 1302 to 408. They are referred to as the 408 base syllables( each can bear different tones ) here in this paper. A conventional approach of Mandarin syllable recognition has been widely accepted, in which the tones and the 408 base syllables are separately recognized in parallel by two sub-sytems. In this paper, on the other hand, three classes of sub-syllabic units for Mandarin syllables are defined, i.e., the Initials, the Finals, and the Transitions, and a new structure for Mandarin syllable recogniton is developed, in which the tones and base syllables are recognized jointly and a total of 574 sub-syllabic unit models will be enough to provide improved recognition performance.
Multi4 phase-coded modulation (MHPM) is a bandwidth efficient modulation scheme which offers substantial coding gain over conventional digital modulations. In this paper, a new concept of MHPM with asymmetric modulation indices corresponding to the bipolar data + 1 and -1 is considered, and numerical results of the minimum Euclidean distances for such asymmetric binary multi-h schemes are provided. It is shown that performance improvements on the error probability are gained over conventional MHPM with essentially the same bandwidth and a very slight modification in implementation. The upper bounds of error probabilities as functions of observation intervals and received Eb/No are also investigated in detail.
A novel approach to the problem of signal extrapolation from its Hartley transform magnitudes is presented. Using a newly defined function, it is proved that using only one known sample and the associated Hartley transform magnitudes a finite extended signal can be completely reconstructed. An algorithm for signal reconstruction from short-time Hartley transform (STHT) magnitudes with minimal window overlap can consequently be derived.
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