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fdi

  • fdi

    fdi

    標簽: fdi

    上傳時間: 2013-12-20

    上傳用戶:moerwang

  • fdi Intel開發的FLASH文件系統,功能很強大

    fdi Intel開發的FLASH文件系統,功能很強大

    標簽: Intel FLASH fdi 文件系統

    上傳時間: 2015-07-04

    上傳用戶:ma1301115706

  • 基于頻率插值的4.0kbps 語音編碼器的性能和設計(英文)

    The 4.0 kbit/s speech codec described in this paper is based on a Frequency Domain Interpolative (fdi) coding technique, which belongs to the class of prototype waveform Interpolation (PWI) coding techniques. The codec also has an integrated voice activity detector (VAD) and a noise reduction capability. The input signal is subjected to LPC analysis and the prediction residual is separated into a slowly evolving waveform (SEW) and a rapidly evolving waveform (REW) components. The SEW magnitude component is quantized using a hierarchical predictive vector quantization approach. The REW magnitude is quantized using a gain and a sub-band based shape. SEW and REW phases are derived at the decoder using a phase model, based on a transmitted measure of voice periodicity. The spectral (LSP) parameters are quantized using a combination of scalar and vector quantizers. The 4.0 kbits/s coder has an algorithmic delay of 60 ms and an estimated floating point complexity of 21.5 MIPS. The performance of this coder has been evaluated using in-house MOS tests under various conditions such as background noise. channel errors, self-tandem. and DTX mode of operation, and has been shown to be statistically equivalent to ITU-T (3.729 8 kbps codec across all conditions tested.

    標簽: frequency-domain interpolation performance Design kbit_s speech coder based and of

    上傳時間: 2018-04-08

    上傳用戶:kilohorse

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