This paper describes the development of an embedded Cantonese text-to-speech synthesizer to enable multi-device access to Chinese Web content. Advancements in wireless communication is driving Web visitors from using ...
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This paper describes the development of an embedded Cantonese text-to-speech synthesizer to enable multi-device access to Chinese Web content. Advancements in wireless communication is driving Web visitors from using desktop PCs to mobile handheld devices. Significant reduction in the form factors of the client devices tends to shift information delivery from the visual to the aural modality. This calls for synthesizers that can run on relatively stringent computational and storage resources of handheld devices. We report on the migration of our Cantonese synthesizer, CU VOCAL, from the desktop to the embedded platform. Migration preserves the support for speech synthesis markups (SSML), ensures code compatibility and lowers the storage requirements of the syllable inventory. Results from listening tests indicate no signification deterioration in synthesis quality of embedded CU VOCAL when compared to its desktop counterpart.
We propose a new joint multiple matrix diagonalization algorithm for robust blind beamforming. This new algorithm is based on the iterative eigen-decomposition of cumulant matrices. Therefore it can avoid the stabilit...
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We propose a new joint multiple matrix diagonalization algorithm for robust blind beamforming. This new algorithm is based on the iterative eigen-decomposition of cumulant matrices. Therefore it can avoid the stability and misadjustment problems arising among the conventional steepest-descent approaches for constant-modulus or cumulant optimization. Our Monte Carlo simulations show that our proposed algorithm significantly outperforms the JADE algorithm based on the Givens rotation for PSK source signals in terms of signal-to-interference-and-noise ratio for a wide variety of signal-to-noise ratios
In this paper, an efficient VLSI architecture for the computation of the convolution-based discrete wavelet transform (DWT) is presented. The proposed architecture employing two processing elements and a single buffer...
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A frequency domain approach is presented for parsimonious channel estimation which can result in the implementation of a low complexity DS-CDMA RAKE receiver. We consider frequency selective slowly fading channels. A ...
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In this paper, we present a joint time/frequency domain approach for pitch estimation of speech at a very low SNR. The kernel of this approach lies in introducing a new function for detecting the time-domain cue by mo...
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In this paper, we present a joint time/frequency domain approach for pitch estimation of speech at a very low SNR. The kernel of this approach lies in introducing a new function for detecting the time-domain cue by modifying the circular average magnitude difference function (CAMDF). By using the new function in conjunction with the half-wave rectified version of the autocorrelation function, the pitch-peak can be emphasized and the non-pitch peaks suppressed. To guarantee a robust pitch detection in noisy speech, a priori frequency-domain estimate of the dominant pitch-harmonic is extracted as an additional cue and is utilized to optimally match the pitch-peak in time-domain. The proposed approach is simulated using the Keele reference database. It is shown that the proposed method using joint time and frequency domain cues is able to give a superior accuracy relative to some of the existing methods even at a very low SNR of -10 dB.
This paper presents a new application of independent component analysis (ICA) in magnetic resonance (MR) image analysis. One of most successful applications for ICA-based approaches in MR imaging is functional MRI (fM...
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Orthogonal frequency division multiplexing is considered to be an appealing modulation technique for high-speed wireless communication systems owing to its spectral efficiency and robustness against multipath fading. ...
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ISBN:
(纸本)0780388348
Orthogonal frequency division multiplexing is considered to be an appealing modulation technique for high-speed wireless communication systems owing to its spectral efficiency and robustness against multipath fading. However, an OFDM system is very sensitive to synchronization and a small frequency or timing offset may cause a large intercarrier interference (ICI), leading to a dramatic degradation in system performance. The paper presents an efficient symbol and frequency synchronization scheme for OFDM systems that is compatible with the IEEE 802.16a standard. A timing algorithm is proposed based on the preamble defined in IEEE 802.16a. The conjugate symmetry of the preamble structure is exploited to reduce computational complexity. It is shown that the new scheme not only reduces the estimation error significantly, but also allows for independent symbol synchronization compared to the conventional methods where fine timing usually has to be done after the frequency offset correction.
In this paper, we propose a scheme intended for low bit-rate motion-compensated interpolation to improve the quality of low bit-rate video encoded in conjunction with the frame dropping technique. We develop a two-mod...
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In this paper, we propose a scheme intended for low bit-rate motion-compensated interpolation to improve the quality of low bit-rate video encoded in conjunction with the frame dropping technique. We develop a two-mode interpolation errors concealment (TMIEC) MCI scheme, which exploits the block-based motion vector field available to the decoder and which can work well in both smooth regions and edge regions. Simulation results demonstrate that, with the help of a gradient estimator, TMIEC results in a better subjective quality and objective quality compared to previously proposed schemes.
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