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Audio coding apparatus and method thereof

A technology of encoding and encoder, applied in the field of encoding, can solve the problems of frequency band finding good fit and sub-optimal matching

Inactive Publication Date: 2010-11-24
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Although lower-frequency searches generally provide improved matching to high-frequency regions of the original signal compared to previous methods that simply transpose low-frequency regions to high-frequency regions, matching still occurs when spectral properties differ significantly from high-frequency regions. may be suboptimal
It can then become difficult to find a good fit for frequency bands from the low frequency region

Method used

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  • Audio coding apparatus and method thereof
  • Audio coding apparatus and method thereof
  • Audio coding apparatus and method thereof

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Embodiment Construction

[0067] Possible codec mechanisms for providing a layered or scalable variable-rate audio codec are described in more detail below. In this regard, first refer to figure 1 , which is a schematic block diagram of an exemplary electronic device 10 that may contain a codec according to an embodiment of the present invention.

[0068] The electronic device 10 may be, for example, a mobile terminal or user equipment of a wireless communication system.

[0069] The electronic device 10 comprises a microphone 11 linked to a processor 21 via an analog-to-digital converter 14 . The processor 21 is further linked to a speaker 33 via a digital-to-analog converter 32 . The processor 21 is further linked to a transceiver (TX / RX) 13 , a user interface (UI) 15 and a memory 22 .

[0070] The processor 21 can be configured to execute various program codes. The implemented program code includes audio encoding code for encoding a lower frequency band of the audio signal and a higher frequency...

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Abstract

An encoder for encoding an audio signal. The encoder is configured to determine at least one characteristic of the audio signal; divide the audio signal into at least a low frequency portion and a high frequency portion, and generate from the high frequency portion a plurality of high frequency band signals dependent on the at least one characteristic of the audio signal. The encoder further determines for each of the plurality of high frequency band signals at least part of the low frequency portion which can represent the high frequency band signal.

Description

technical field [0001] The present invention relates to coding, and in particular but not exclusively to speech or audio coding. Background technique [0002] An audio signal, such as speech or music, is encoded, eg, to support efficient transmission or storage of the audio signal. [0003] Audio encoders and decoders are used to represent audio-based signals such as music and background noise. These types of encoders generally do not use a speech model for the encoding process, but instead use a process for representing all types of audio signals, including speech. [0004] Speech coders and decoders (codecs) are usually optimized for speech signals and can operate at a fixed or variable bit rate. [0005] Audio codecs can also be configured to operate with varying bit rates. At lower bit rates, such audio codecs can operate on speech signals at encoding rates equivalent to pure speech codecs. At higher bit rates, audio codecs can encode any signal, including music, bac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L19/02G10L19/00G10L21/038
CPCG10L21/038G10L19/0208
Inventor L·拉克索南M·塔米A·瓦西拉彻A·拉莫
Owner NOKIA CORP