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Frequency-time conversion method and device of audio signal

A technology of an audio signal and a conversion method, which is applied in the field of audio decoding to achieve the effects of saving buffer space, saving storage space and reducing the amount of data

Active Publication Date: 2013-12-11
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The problem solved by the present invention is how to reduce the high consumption of memory in the frequency-to-time conversion process of audio signals in the prior art and how to improve the computing efficiency of frequency-to-time conversion of audio signals

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  • Frequency-time conversion method and device of audio signal

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Embodiment Construction

[0040] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041]In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described here, and those skilled in the art can make similar extensions without departing from the connotation of the present invention. Accordingly, the present invention is not limited to the specific embodiments disclosed below.

[0042] During the decoding process of the audio signal, frequency-time conversion of the audio signal is usually performed. There are many standards for audio signal formats, such as MP3, AAC, AAC+, AAC++, WMA, and Real Audio. The current audio standards all use IMDCT (Inverse Modified Dis...

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Abstract

The invention provides a frequency-time conversion method and device of an audio signal. The frequency-time conversion method of the audio signal comprises the following steps of: carrying out frequency-time conversion operation on N-point frequency domain data of a frame of the audio signal to obtain N-point first middle data of the corresponding frame, wherein the N is an even number; based on a mapping relation between the N-point first middle data and 2N-point second middle data, carrying out windowing operation on N / 2-point first middle data of the last frame to obtain windowing data of N-point second middle data of the last frame; carrying out the windowing operation on the N / 2-point first middle data of the current frame to obtain the windowing data of the N-point second middle data of the current frame; and superposing the windowing data of the N-point second middle data of the last frame and the windowing data of the N-point second middle data of the current frame to obtain N-point time domain data of the current frame. According to the technical scheme disclosed by the invention, the energy consumption of an internal memory space in the frequency-time conversion process of the audio signal is reduced and the efficiency of the frequency-time conversion process of the audio signal is improved.

Description

technical field [0001] The invention relates to the technical field of audio decoding, in particular to a method and device for frequency-time conversion of audio signals. Background technique [0002] There are many audio signal formats at present, such as AAC (Advanced Audio Coding), AAC+, AAC++, WMA (Windows Media Audio), MP3 (MPEG Audio Layer 3), Real Audio and other formats, among which the MP3 format is more commonly used. Regardless of the format of the audio, it needs to be coded before it can be played. [0003] During the decoding process of the audio signal, frequency-time conversion of the audio signal is usually performed. The current frequency-to-time conversion of audio signals uses IMDCT (Inverse Modified Discrete Cosine Transform, improved discrete cosine transform) as a method for frequency-to-time conversion of audio signals. [0004] The IMDCT operation has a mapping relationship with the DCT-IV (DCT for Discrete Cosine Transform IV, discrete cosine tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/025
Inventor 李昙张本好吴晟徐晶明林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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