Band spreading coding method and device and decode method and device
A technology of frequency band extension and encoding method, applied in the fields of frequency band extension encoding method and device, decoding method and device, capable of solving problems such as low sound quality and large distortion
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Embodiment 1
[0117] Embodiment 1: a first type of frequency band extension coding device.
[0118] The schematic diagram of the structure of the frequency band extension encoding device in this embodiment is as follows Figure 5 shown. The frequency band extension coding method of the present invention includes a time-varying prediction analysis module 501 , a signal type analysis module 502 , a spectrum parameter encoding module 503 , a time-varying prediction synthesis module 504 and a time-domain adaptive gain adjustment parameter extraction module 505 .
[0119] The time-varying prediction analysis module 501 is used to receive the original high-frequency time-domain signal output by the preprocessing and analysis filter bank 101, and divide the received original high-frequency time-domain signal according to the analysis result from the signal type analysis module 502 It is one or more predicted frames, and the predicted frame is a group of time-domain signal samples, which is the un...
Embodiment 2
[0201] Embodiment 2: a second type of frequency band extension coding device.
[0202] The schematic diagram of the structure of the frequency band extension encoding device in this embodiment is as follows Figure 11 shown, with Figure 5 Compared with, the encoding mode selection module 507 is added, while other modules are the same as Figure 5 The module of the same name in is exactly the same. The encoding mode selection module 507 is used to receive the low-frequency encoding mode information and the low-frequency excitation signal or spectrum from the low-frequency encoder, and perform processing according to the preset high-frequency encoding mode, and the preset high-frequency encoding mode is divided into mode 1 and mode 2. Mode 1 performs both frequency domain adjustment and time domain adjustment on the TCX frame low-frequency excitation spectrum output by the low-frequency encoder or the low-frequency time-domain excitation signal of the ACELP frame; while mode ...
Embodiment 3
[0209] Embodiment 3: a first type of frequency band extension decoding device.
[0210] The device in this embodiment is a decoding device corresponding to the encoding device in Embodiment 2, and its structural diagram is as follows Figure 12 As shown, it includes a high-frequency decoding mode selection module 1201 , a spectral parameter decoding module 1202 , an adaptive time-domain gain decoding module 1203 and a time-varying prediction synthesis module 1204 .
[0211] The high-frequency decoding mode selection module 1201 first selects the high-frequency decoding mode. The high-frequency decoding mode corresponds to the high-frequency encoding mode in Embodiment 2, including mode 1 and mode 2. The selection method is the same as that of the encoding end. When mode 1 is selected, the low-frequency excitation spectrum of the TCX frame obtained from the TCX decoder is output to the spectral parameter decoding module 1202, or the low-frequency excitation signal of the ACELP ...
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