Abstract
Provided in embodiments of the present invention are a prediction method and decoding device for a bandwidth expansion frequency band signal. The method comprises: demultiplexing a received bitstream to acquire a frequency domain signal; determining whether or not the highest frequency point having bits allocated of the frequency domain signal is less than a predetermined starting frequency of a bandwidth expansion frequency band; if yes predicting an excitation signal of the bandwidth expansion frequency band on the basis of excitation signals in a predetermined frequency band range of the frequency domain signal and of the predetermined starting frequency point of the bandwidth expansion frequency band; otherwise predicting the excitation signal of the bandwidth expansion frequency band on the basis of the excitation signals in the predetermined frequency band range of the frequency domain signal of the predetermined starting frequency point of the bandwidth expansion frequency band and of the highest frequency point having bits allocated; and predicting a bandwidth expansion frequency band signal on the basis of the predicted excitation signal of the bandwidth expansion frequency band and of a frequency domain envelope of the bandwidth expansion frequency band. The technical solution of embodiments of the present invention is capable of effectively ensuring between preceding and subsequent frames the continuity of the excitation signals predicted for the bandwidth expansion frequency band signal thus ensuring the auditory quality of a restored bandwidth expansion frequency band signal.
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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
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Specification Information
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.