Abstract
SUMMARY OF THE INVENTION The present invention emphasizes the periodicity of a generated excitation signal in relation to a pitch code vector and an innovative code vector to provide a signal synthesis filter to generate a synthesized wideband signal. Method and apparatus. In the periodicity enhancement method and apparatus, the coefficient generator calculates the periodicity coefficient in response to the adaptive code vector and the innovative code vector. Then, the innovation filter processes the innovative code vector in relation to this periodicity coefficient, reducing the energy of the low frequency portion of the innovative code vector and enhancing the periodicity of the low frequency portion of the excitation signal. For example, this innovation filter has a transfer function of the formula F (z) = − α (z) + 1−α (z) −1 , where α is a periodic coefficient, and the coefficient generator has the relation α = qR P (except alpha <q) to calculate the periodicity coefficients using, where q is an enhancement factor set for example 0.25, R P is represented by the formula (I), wherein Where v T is the pitch code vector, b is the pitch gain, N is the subframe length, and u is the excitation signal.
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| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 5G,4G,3G,2G | 06/01/2010 | ISLD-201001-018 | VOICEAGE CORPORATION | No | Family Member | ||||
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Technologies
Signal Processing
Product
Base Station (eNB/gNB)User Equipment (UE/Terminal)
Use Cases
Network OptimizationWireless communication
Services
Error correction/detection
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