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How to achieve a breakthrough of digital audio sound barrier - sound, projectors, home theater - HC Network Appliance Industry
People expect quality recording and playback sound. However, they not willing to large Hard Drive, or T1 line or a long wait for the cost of document transmission and spend. How to resolve these contradictions? In accordance with the digital signal processor reference manual on introduction to digital signal processing technology and chip, may be an additional surprise.
Sampled at 44.1kHz for reference by the two-channel 16-bit digital audio editing circuit can generate a slightly larger than 1.4Mbps data bit stream. However, this needs to document transmission of nearly 11M bytes / min of storage capacity. No loss or entropy compression data compression can be a third or half, but the amount of information than the general ADSL (Asymmetric Digital Subscriber Line) or cable modem connections can reliably transmit or fast downloading capacity. Moreover, it will quickly fill up based on magnetic, light and semiconductor storage medium. In addition, many lossless data compression technology is not suitable for mobile carrier.
Lot of information that people on the loss, discrimination, an increasing interest in compression and made a lot of effort. The loss, discrimination, compressed files can be compressed to its original size of 1 / 12 or 1 / 24, and compressed, and can hear the original soundtrack is not qualitatively different. If the audio source can be allowed to limit the fidelity and frequency, such as a target point to the deep bass subwoofer channel or a single tone of language skills, then this effect may be reduced even more significant.
General basis
Many lossy compression schemes have adopted a similar high-level functional modules, or their subset. Encoder to enter the non-compressed bit stream is divided into a variety of sampling overlapping windows, and each set of parallel route to a filter library and a perception processor. Filter library implemented in each window of time / frequency transform, similar to the JPEG and MPEG image compression in the core of the pixel position to the frequency matrix DCT (discrete cosine transform). Time / frequency transform to eliminate from the sample to the sampling frequency of redundancy, be broken down into common factors. If you change the design well, but as the filter in the frequency domain as the time when the data is not changed, then the subsequent frequency / time, then change will accurately reproduce the original signal. This "input equals output" of the target as identification system.
Discriminant processor concept identified in the sampling frequency masking and time masking. In the frequency masking, the bigger the sound will be masked around the frequencies of small live quiet, and in time cover, the large masking sound will occur in the small quiet before and after. Processor must first determine the highest intensity identified and transform the audio sample frequency, and then calculate its masking curve. This curve to the sensitivity of people's auditory system function of the frequency curve together.
Discriminant models using filter bank and the output of quantizer calculated according to their frequency and determination of the masking curve can be significant attenuation of the tone data. It is entirely possible to discard certain tone data. Since the inherent characteristics of human ears and voice of the nearby larger (in terms of time and frequencies) of the shelter, even in the final compressed data bit stream information may exist, but this information may also be able to hear. Similarly, this function module to determine each lower than the quantization noise produced but not detected level of frequency masking. It quantification of each factor to the increase in noise is audible just below the threshold point. Some of the codecs, assuming a low intensity voice sounds more generic than the high strength and high-resolution components in the absence of noise by (this time to meet the requirements of the most difficult to obtain SNR) conditions, the process is more important to opt for a non-linear Quantification method.
The next step of the process including the use of Huffman coding, arithmetic coding or similar lossless compression mode choice quantization coefficient. Will have long since quantification generally zero-sequence repeat, so no loss of coding can reduce the flow of data bits. Finally, the encoder tightening these factors into the general size of the data "block", sometimes also with synchronization, error concealment, buffer management, information and other additional position title, etc..
Corresponding decoder usually simple, it should adapt to a one to many a multimedia distribution programs. It first opened compressed audio bit stream, re-generate the frequency coefficients, and then do the frequency and time of the re-transformation, often with a low-pass filtering to eliminate aliasing. It also must be able to deal with buffer management, especially the use of variable bit rate compression and error management to deal with buffer management, error management, it is beyond the reach of the input for the sequence of packets, and other fundamental unreachable packets.
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