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partitioning of the excitation space is known as an algebraic code book hence the name of the vocoder
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Error Weighting Filter The approach described earlier of minimizing a mean-squared error results in a quantization noise that has equal energy across the spectrum of the input signal However, by making use of properties of the human auditory system, the vocoder designer can focus on reducing the perceived amount of noise It has been found that greater amounts of quantization noise are undetectable in the frequency bands where the speech signal has high energy Namely, the designer wants to shape the noise as a function of the spectral peaks in the speech signal To put this masking effect to work in the vocoder design, the quantization noise has to be properly distributed among different frequency bands This can be achieved by minimizing a weighted error from the ST predictor filter Adaptive Postfilter The noise in speech caused by the quantization of the excitation signal remains an area of vocoder design improvement (In particular, in the low-energy frequency regions, the noise can dominate the speech signal) The perceived noise can be further reduced using a postprocessing technique called postfiltering after reconstruction by the decoder This operation trades off spectral distortion in the speech versus the suppression of the quantization noise by emphasizing the spectral peaks and attenuating the spectral valleys The postfilter is generally implemented as a combination ST/LT filter The ST postfilter modifies the spectral envelope, which is based on the transmitted ST predictor coefficients (It can also be derived from the reconstructed signal) The parameters for the LT postfilter are either derived from the transmitted LT predictor coefficients or computed from the reconstructed speech99
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ITU-T Recommendation G729 CS-ACELP standard (1995) is a speech coding and decoding standard that provides 4-kHz speech bandwidth (telephone bandwidth) at a bit rate of 8 Kbps This coder is well suited to a wide range of applications, including both voice storage and voice communications It is ideally suited for telecommunications networks in which tollquality speech is a requirement, and where total communications link delay and the capability to operate in noisy environments (possibly through several tandem encode/decode combinations) are important factors101 G729 encodes 80 sample frames (10 ms) of 16-bit linear PCM data into 10 8-bit codewords G729 provides near toll-quality performance under clean channel conditions The G729 codec operates on 10-ms frames with 5 ms of look-
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Technologies for Packet-Based Voice Applications
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ahead, causing low transmission delays The coder offers good speech quality in network impairments such as frame loss and bit errors, and is suitable for applications such as VoFR, teleconferencing or visual telephony, wireless telephony, and voice logging Additional bandwidth savings are possible via VAD (G729 Annex B) The full CS-ACELP algorithm implementation runs on a single DSP and has quality similar to the G728 16-Kbps coding standard A good implementation is expected to pass all the floating-point tests provided by the ITU for algorithm verification102 The standard specifies a CELP that uses an algebraic code book to code the excitation signal The coder operates on speech frames of 10 ms (80 samples at an 8-kHz sample rate), computes the LT predictor coefficients, and operates in an analysis-by-synthesis loop to find the excitation vector that minimizes the perceptually weighted error signal ITU-T Recommendation G728 LD-CELP vocoder standard (1992) is a 16-Kbps algorithm for coding telephone-bandwidth speech for universal applications using LD-CELP This coder is well suited for a wide range of applications, including both voice storage and voice communications It is ideally suited for telecommunications networks in which toll-quality speech is a requirement and total communications link delay is an important factor102 In order to attain high speech quality at medium rates, it is necessary to increase coding gain by making some use of model-based coding This generally involves relatively high delays on the order of 40 to 100 ms due to the block-based operation of most model-based coders The G728 coding algorithm is based on a standard analysis-by-synthesis CELP coding technique However, several modifications are incorporated by vendors to meet the needs of low-delay, high-quality speech coding G728 uses short excitation vectors (5 samples, or 0625 ms) and backward-adaptive linear predictors The algorithmic delay of the resulting coder is 0625 ms, resulting in an achievable end-to-end delay of less than 2 ms The G728 standard was designed to provide speech quality that is equivalent to or better than that of the G721 32-Kbps ADPCM international standard, even after three tandem connections The G728 coder was also designed to behave well in the presence of multiple speakers and background noise, and to be capable of handling nonspeech signals such as DTMF tones and voiceband modem signals at rates of up to 2,400 bps (if perceptual weighting and postfiltering are disabled) Techniques such as bandwidth expansion of the LPC filter coefficients and code book structuring have been incorporated into the standard to improve resistance to moderate channel error conditions The G728 coder achieved an MOS score of 40 ITU-T Recommendation G726 is a speech coding and decoding standard that provides 4-kHz speech bandwidth switchable at 40, 32, 24, or 16 Kbps We discussed this standard earlier in the chapter in terms of its components and operation The full algorithm implementation runs on a single
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