Method for realizing AMR-WB (adaptive multi-rate wideband) voice coding or decoding by adopting information hiding technology
An information hiding and speech encoder technology, applied in speech analysis, instruments, etc., can solve problems such as large network overhead and large number of parameter bits, and achieve the effect of reducing network load, reducing encoding rate, and saving network bandwidth resources.
Inactive Publication Date: 2012-09-26
SUZHOU INST FOR ADVANCED STUDY USTC
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[0009] The purpose of the present invention is to provide a method for AMR-WB speech coding using information hiding technology, which hides ISF parameters in fixed codebook parameters for transmission, and solves the problem caused by the large number of coded parameter bits in the prior art. Large network overhead and other issues
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[0048] In order to fully disclose the content of the present invention, this embodiment first introduces the search principle of the AMR-WB fixed codebook. In the AMR-WB technical specification, the goal of searching for the best fixed codebook is to minimize the mean square error between the weighted input speech and the weighted reconstructed speech. The fixed codebook vector is a 64-dimensional vector with each pulse amplitude of +1 or -1.
[0049] The process of finding the best codebook vector is to find The process of the maximum value, where H is the lower triangular Toeplitz convolution matrix, d=H t x 2 is the target signal x 2 Cross-correlation of (n) and the impulse response h(n) of the perceptually weighted synthesis filter, φ=H t H is the autocorrelation matrix of h(n). Since the codebook vector c k Only some of them are non-zero pulses, and its codebook allows fast searching. AMR-WB reduces the search range each time by using the first depth tree search a...
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The invention discloses a method for realizing AMR-WB (adaptive multi-rate wideband) voice coding or decoding by adopting an information hiding technology, capable of reducing coding parameter length and saving voice transmission bandwidth. The AMR-WB voice coder comprises a linear prediction (LPC) analysis module, a fundamental tone search module and a fixed codebook search module (comprising aninformation hiding sub module). The method comprises the following steps of: (1) extracting ISF (information system finishing) parameter coding by virtue of an LPC analysis module according to a coding rate mode, and dividing the parameter coding into hidden information ST to be embedded in a step (2); and (2) searching a second best codebook according with constraint conditions (I) in a local codebook space by adopting a first depth tree search algorithm by virtue of the fixed codebook search module, and embedding the ST into a fixed codebook index to be transmitted, wherein T is a number ofa codebook track and is selected from a codebook track 0, a codebook track 1, a codebook track 2 and a codebook track 3; ST is ISF index information to be embedded in a codebook track T; NT is the number of nonzero pulses contained in the codebook track T; PTk is the kth pulse in the codebook track T; and M is an embedded bit control bit, and log2M is maximum bit number of embeddable information in each track. By applying the method, the coding speed is reduced, the resource utilization factor is improved, the method is simple and feasible, and no additional computation complexity is increased.
Description
technical field [0001] The invention belongs to the field of mobile communication, in particular to the technical field of speech coding, in particular to a method for using information hiding technology to perform AMR-WB speech coding or decoding, and reducing the length of coding parameters or the coding rate. Background technique [0002] Adaptive Multi-Rate Wideband Speech Coding (AMR-WB) is a wideband speech compression coding technology formulated by 3GPP / ETSI and used in the third generation mobile communication system WCDMA. It was also adopted by ITU-T as the G722.2 standard and became the first A speech coding technique used in both wireless and wired communications. AMR-WB supports 9 rate modes (23.85, 23.05, 19.85, 18.25, 15.85, 14.25, 12.65, 8.85, 6.6kbit / s), and solves the rate allocation problem of source and channel coding in a more intelligent way. In addition, AMR- WB provides a voice bandwidth ranging from 50HZ to 7000HZ, and users can subjectively experi...
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IPC IPC(8): G10L19/00G10L19/018G10L19/24
Inventor 缪海波黄刘生陈志立杨威
Owner SUZHOU INST FOR ADVANCED STUDY USTC
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