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The synthesizers used in most LPC decoders are based on a very basic model of the vocal tract.Basic feature of an LPC encoder/decoder: figure 4.4Ĥ.2.4 Linear predictive coding -cont (figure 4.4).Three feature which determine the perception of a signal by the ear are its:.There are then quantizized and sent and the destination uses them,together with a sound synthesizer,to regenerate a sound that is perceptually comparable with the source audio signal.this is LPC technique.Even higher levels of compression-but at higher levvels of complexity-can be obtained by also making the predictor coefficients adaptive.This is the principle of adaptive of adaptive predictive coding.A third standard based on ADPCM is also available.this is defined in G.726.This also uses subband coding but with a speech bandwidth of 3.4kHz.A second ADPCM standard ,which is G.722.It added subband coding.Additional savings in bandwidth –or improved quality –can be obtained by varying the number of bits used for the difference signal depending on its amplitude.
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Ĥ.2.1 Differential pulse code modulation –cont (figure 4.1) DPCM is a derivative of standard PCM and exploits the fact that,for most audio signals, the range of the differences in amplitude between successive samples of the audio waveform is less than the range of the actual sample amplitudes.
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Visual graphics to preview compression results let you see the resulting file size and its changes depending on set compression options.Video frame size controls allow you to easily resize video.Easily set bitrates for video and audio data, to get any desired file size.Get MP4, 3GP, FLV, AVI video files, or set "Original" to get the resulting file in the same file format as the source one.Over 100+ video/audio codecs and over 20+ video file formats (containers) are supported to decode source video files, including : AVI, WMV, FLV, 3GP, MKV, MOV, MP4, MPEG, MPG, DIVX, XVID, ASF, AVM, AVS, DAT, F4V, NSV, OGM, RM, RMVB, TP, TS, VOB.
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