Method and apparatus for interleaving line spectral information quantization methods in a speech coder
A speech encoder, spectral information technology, applied in speech analysis, instrumentation, code conversion, etc., can solve problems affecting speech quality, non-steady frame performance degradation, etc.
Inactive Publication Date: 2002-07-31
QUALCOMM INC
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As a result, non-stationary frame performance degrades and affects speech quality
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[0024] The exemplary embodiment described below resides in a radiotelephone communications system configured using a CDMA air interface. However, it should be understood by those skilled in the art that the sub-sampling method and apparatus using the features of the present invention may be installed in any of a variety of communication systems used in a wide range of technologies known to those skilled in the art middle.
[0025] Such as figure 1 As shown, a CDMA wireless telephone system generally includes a plurality of mobile subscriber units 10, a plurality of base stations 12, base station controllers (BSCs) 14 and a mobile switching center (MSC) 16. MSC 16 is configured to interface with a conventional public switched telephone network (PSTN) 18 . MSCs are also configured to interface with BSCs 14 . BSCs 14 are connected to base stations 12 through backhaul lines. Backhaul lines can be configured to support any of several known interfaces including, for example, E1 / ...
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A method and apparatus for interleaving line spectral information quantization methods in a speech coder includes quantizing line spectral information with two vector quantization techniques, the first technique being a non-moving-average prediction-based technique, and the second technique being a moving-average prediction-based technique. A line spectral information vector is vector quantized with the first technique. Equivalent moving average codevectors for the first technique are computed. A memory of a moving average codebook of codevectors is updated with the equivalent moving average codevectors for a predefined number of frames that were previously processed by the speech coder. A target quantization vector for the second technique is calculated based on the updated moving average codebook memory. The target quantization vector is vector quantized with the second technique to generate a quantized target codevector. The memory of the moving average codebook is updated with the quantized target codevector. Quantized line spectral information vectors are derived from the quantized target codevector.
Description
technical field [0001] The present invention relates generally to the field of speech processing, and is particularly directed to methods and apparatus for quantizing line spectral information in speech coders. Background technique [0002] Voice transmission via digital technology has become common, especially in long-distance and digital wireless telephony applications. This in turn has led to an interest in determining the minimum amount of information sent over the channel that preserves the perceived quality of the reconstructed speech. If voice is transmitted by simple sampling and digitization, a data rate of about 64 kilobits per second (kbps) is required to achieve the voice quality of traditional analog telephony. However, the data rate can be significantly reduced through the use of speech analysis, followed by appropriate encoding, transmission and resynthesis at the receiver. [0003] Devices for compressing speech are found in many telecommunications fields. ...
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IPC IPC(8): G10L19/04G10L19/038G10L19/08G10L19/16G10L19/22H03M7/30
CPCG10L19/07G10L25/12G10L19/038G10L19/22G10L2019/0005G10L19/06
Inventor A·K·阿南塔帕德玛那伯汉S·曼朱那什
Owner QUALCOMM INC