Coding of audio signals

An audio signal and coding technology, which is applied in the field of audio signal coding, can solve problems such as audio bandwidth annoyance, and achieve the effect of improving audio signal quality

Inactive Publication Date: 2007-04-04
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Users may find this change in audible audio bandwidth particularly annoying when changing from a wider audio band to a narrower audio band, i.e. from Extended mode to AMR-WB mode

Method used

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  • Coding of audio signals
  • Coding of audio signals
  • Coding of audio signals

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Embodiment Construction

[0036] Fig. 1 shows the concept of sub-band encoding and decoding using two band filter banks and separate encoding and decoding blocks for each audio segment according to an example embodiment of the invention. The input signal from the signal source 1.2 is first processed by an analysis filter 1.3 in which the audio segment is divided into at least two audio segments, i.e. into a lower frequency audio segment and a higher frequency audio segment , and critically downsample. The lower frequency audio segments are then encoded in a first encoding block 1.4.1 and the higher frequency audio segments are encoded in a second encoding block 1.4.2, respectively. Audio segments are encoded substantially independently of each other. The multiplexed bit stream is transmitted from the transmitting device 1 to the receiving device 3 through the communication channel 2, and in the receiving device 3, the low frequency band and the high frequency decoding. The decoded signal is up-sampl...

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Abstract

An encoder comprises an input for inputting frames of an audio signal in a frequency band, an analysis filter dividing the frequency band into lower and higher frequency bands, a first encoding block for encoding the audio signals of the lower frequency band, a second encoding block for encoding the audio signals of the higher frequency band, and a mode selector for selecting an operating mode for the encoder among at least a first mode where signals only on the lower frequency band are encoded, and a second mode where signals on both the lower and higher frequency band are encoded. The encoder has a scaler to gradually change the encoding properties of the second encoding block in connection with a change in the operating mode of the encoder. The invention also relates to a device, a decoder, a method, a module, a computer program product, and a signal.

Description

technical field [0001] The invention relates to an encoder comprising an input for a frame of an audio signal in an input frequency band, an analysis filter for dividing the frequency band into at least a lower frequency band and an upper frequency band, for performing an analysis on the audio signal of the lower frequency band a first encoding block for encoding, a second encoding block for encoding an audio signal of a higher frequency band, and a mode selector for selecting an operating mode of the encoder between at least a first mode and a second mode, in In the first mode only the signal on the lower frequency band is encoded, and in the second mode the signal on the lower and upper frequency bands is encoded. The invention also relates to a device comprising an encoder comprising an input for an audio signal frame in an input frequency band, an analysis filter for dividing the frequency band into at least a lower frequency band and an upper frequency band, with A first...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10LG10L19/24G10L25/18
CPCG10L19/24G10L25/18G10L19/02G10L19/06G10L19/08
Inventor 帕西·奥雅拉雅里·马基南阿里·拉卡尼米
Owner NOKIA CORP
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