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Fast Fourier transform circuit of audio processing device

A Fourier transform and audio processing technology, applied in electrical digital data processing, special data processing applications, digital data processing components and other directions, can solve problems affecting hardware cost, circuit area and processing efficiency

Active Publication Date: 2021-09-10
珠海市煊扬科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] It can be seen that the hardware circuit used to realize the fast Fourier transform will directly affect the hardware cost, circuit area and processing performance, etc.

Method used

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  • Fast Fourier transform circuit of audio processing device
  • Fast Fourier transform circuit of audio processing device
  • Fast Fourier transform circuit of audio processing device

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Embodiment Construction

[0044] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference symbols are used in the drawings and descriptions to refer to the same or like parts.

[0045] Figure 6 is a schematic diagram of an audio processing device for speech recognition according to an embodiment of the present invention. Please refer to Figure 6 , the audio processing device 10 for speech recognition may include a preprocessing circuit 61 , a fast Fourier transform circuit 62 , and a power spectrum conversion circuit 63 . The preprocessing circuit 61 performs audio preprocessing on the time domain sampled data s1 to generate preprocessed data d1. Audio pre-processing may include pre-emphasis processing, frame blocking processing, windowing processing, and so on. The fast Fourier transform circuit 62 can perform FFT operation on the preprocessed data d1 to genera...

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Abstract

The invention provides a fast Fourier transform circuit of an audio processing device. The fast Fourier transform circuit is used for carrying out N-point fast Fourier transform and comprises a memory circuit and a butterfly operation unit circuit. The butterfly operation unit circuit reads the two-point input data from the memory circuit, performs butterfly operation on the two-point input data according to the twiddle factor to generate two-point output data, and writes the two-point output data into the memory circuit. The butterfly operation unit circuit comprises a multiplier and a plurality of adder-subtractor. The multiplier multiplies the real part coefficient or the imaginary part coefficient of one of the two-point input data by the real part coefficient or the imaginary part coefficient of the twiddle factor in a plurality of clock cycles in sequence. The multiplier performs a multiplication operation in each of the clock periods. The plurality of adder-subtractors execute addition and subtraction operation, so that the butterfly operation unit circuit generates two-point output data.

Description

technical field [0001] The present invention relates to an audio processing circuit, and in particular to a fast Fourier transform circuit for an audio processing device. Background technique [0002] With the advancement of technology, more and more electronic devices start to use voice control, and voice control will become a common user interface for most electronic devices in the future. It can be known that the recognition rate of speech recognition (Speech Recognition) will directly affect the user experience of the user using the electronic device. In the implementation of speech recognition, Fast Fourier Transform (FFT) has been widely used, and its function is to convert time-domain data into frequency-domain data, so as to perform speech recognition according to the spectral characteristics of the speech signal. Furthermore, most audio processing devices for speech recognition have a fast Fourier transform circuit implemented by hardware. [0003] In addition, th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14G10L15/28
CPCG06F17/142G10L15/28G06F7/4812G06F7/544G06F7/523G06F7/50
Inventor 冯梦豪
Owner 珠海市煊扬科技有限公司
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