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AN EXAMPLE OF Bit DisTRIBUTION (F's = 32 KHz, Bir RATE: 64 KpIT/s), NOTE THAT THE AVERAGE BIT RATE PER NON MASKED COEFFICIENT IS 4.85 Bits

Table 1 AN EXAMPLE OF Bit DisTRIBUTION (F's = 32 KHz, Bir RATE: 64 KpIT/s), NOTE THAT THE AVERAGE BIT RATE PER NON MASKED COEFFICIENT IS 4.85 Bits

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Fig. 1. Block diagram of the coder.
Fig. 1. Block diagram of the coder.
masking). It is also supposed that when expressed on the Bark scale, the masking patterns of sounds located at different frequencies can be derived by simple translations [10]. It follows that the full-masking curve S(v) is equal to the convolution over the Bark scale v, of the power spectral density Y(v) by the elementary masking function, B(v):
masking). It is also supposed that when expressed on the Bark scale, the masking patterns of sounds located at different frequencies can be derived by simple translations [10]. It follows that the full-masking curve S(v) is equal to the convolution over the Bark scale v, of the power spectral density Y(v) by the elementary masking function, B(v):
Fig. 3. Examples of spectral noise shaping. The solid line is the spectrum of the signal (F = 32 kHz) and the dotted one is the spectrum of the noise. bits allocated to y(m, &). Then minimizing
Fig. 3. Examples of spectral noise shaping. The solid line is the spectrum of the signal (F = 32 kHz) and the dotted one is the spectrum of the noise. bits allocated to y(m, &). Then minimizing
IV. Bir ALLOCATION AND CODING TECHNIQUES A. The Spectrum Descriptor
IV. Bir ALLOCATION AND CODING TECHNIQUES A. The Spectrum Descriptor
Fig. 5. Pre-echo reduction. Time evolution of the signal (two blocks of N’ samples, duration 32 ms). (a) Original signal, (b) reconstructed signal before postfiltering. (Continued at top of next page.)
Fig. 5. Pre-echo reduction. Time evolution of the signal (two blocks of N’ samples, duration 32 ms). (a) Original signal, (b) reconstructed signal before postfiltering. (Continued at top of next page.)
presented in a random order. The subjects are asked to grade B and C over the CCIR five grade impairment scale (Table IV). 52 expert listeners designated by Radio France took part to this subjective testing. Radio France also chose the 10 original musical sequencies. All the coders operated at a 32 kHz sampling rate. At the total, the test yielded 1850 grades. It can be seen from Table V that in terms of subjective When analyzing the behavior of this coder, it appears that the algorithmic features such as the non transmission of the masked coefficients or the predictive coding of the
presented in a random order. The subjects are asked to grade B and C over the CCIR five grade impairment scale (Table IV). 52 expert listeners designated by Radio France took part to this subjective testing. Radio France also chose the 10 original musical sequencies. All the coders operated at a 32 kHz sampling rate. At the total, the test yielded 1850 grades. It can be seen from Table V that in terms of subjective When analyzing the behavior of this coder, it appears that the algorithmic features such as the non transmission of the masked coefficients or the predictive coding of the
Related topics:
Computer ScienceSignal ProcessingTime-Frequency AnalysisAudio CodingAdaptive FilterDigital Signal ProcessorElectrical and Electronic EngineeringFrame SynchronizationFast AlgorithmCompression Algorithm
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