Analog signal encoding method
A coding and signal technology, applied in speech analysis, instruments, etc., can solve the problems of narrowband excitation signal spectrum distortion, spectrum data error, etc., and achieve the effect of improving quality and large bandwidth
Inactive Publication Date: 2008-01-02
SIEMENS ENTERPRISE COMM GMBH & CO KG
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Problems solved by technology
With this method wideband signals can be created from narrowband signals, but the disadvantage is that this method distorts the spectrum of the narrowband excitation signal or causes data errors in the spectrum
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[0034] In FIG. 1A an excitation signal exc is shown for exciting the synthesis filter A(z). The synthesis filter A(z) simulates the human vocal folds in the case of speech signals, so that in this case a synthesized acoustic signal AS_syn is generated with the aid of a suitable excitation signal exc. This synthesized acoustic signal is compared with the actual acoustic signal as by means of a comparator C. The excitation signal exc is then balanced such that the synthesized acoustic signal AS_syn approximates the actual acoustic signal as as closely as possible.
[0035] The generation of the excitation signal exc is shown in FIG. 1B . For this purpose, several parameters are used which are ultimately transmitted for efficient use of the bandwidth, since the transmission of these parameters requires less transmission capacity than the transmission of the excitation signal exc.
[0036] The generation of the excitation signal exc in the broadband solution is shown in FIG. 1B ...
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The invention relates to a method for encoding an analog signal (AS) divided into time frames and to a synthetic signal (AS syn) which is formed on the model thereof in a time frame manner by means of a synthesis filter (A(z)) which is excited by an excitation signal (exc), wherein said excitation signal (excp, exc) is formed by means of at least one adaptive code list (ACB) containing a plurality of scanning values provided with a defined scanning space. For the actual excitation signal (excp, exc), a segment corresponding to the time frame length is selected from the plurality of scanning values by means of a speech-based frequency parameter (p) which can take non-integer values and, in such a case, the values intermediate to the scanning values defined by said speech-based frequency parameter (p) are formed in such a way that the time space between the intermediate values and the scanning values is reduced and the totality of the intermediate and the scanning values is used for forming the excitation signal (excp, exc).
Description
technical field [0001] The invention relates to a method for encoding an analog signal by means of analysis by a synthesis method. Background technique [0002] Bandwidth extensions in audio signals, for example from a 4 kHz telephony bandwidth to an 8 kHz wideband telephony, are currently being discussed extensively, since the quality of speech signals can thus be significantly improved. [0003] However, bandwidth is a limited resource, especially in mobile communications where at least a part of the transmission is over a radio link. That is, a predetermined limited bandwidth must be allocated to multiple users. If the bandwidth provided to one user is to be increased now, the bandwidth provided to the remaining users must be forcibly reduced while the number of users remains the same. [0004] A different method is therefore used to generate a wider-bandwidth signal, such as an 8-kHz bandwidth from 0 to 8 kHz, from an excitation signal in a narrow band, ie, for example...
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IPC IPC(8): G10L19/08G10L19/09
CPCG10L19/09
Inventor W·鲍尔S·尚德尔
Owner SIEMENS ENTERPRISE COMM GMBH & CO KG