Audio signal compressing and sampling system
A technology for compressing sampling and audio signals, applied in speech analysis, instruments, etc., it can solve the problems of low acquisition efficiency, expensive hardware cost, waste of resources, etc., and achieve the effect of reducing channel transmission pressure, hardware cost, and sampling frequency.
Inactive Publication Date: 2012-04-25
ANHUI UNIVERSITY
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This processing method definitely has the following two defects: First, in many practical applications, the sampling rate of the signal must not be lower than twice the signal bandwidth, which makes the hardware system face a great pressure on the sampling rate. Nyquist sampling hardware The cost is expensive, the acquisition efficiency is low, and in some cases it is even impossible to achieve; second, in terms of data storage and transmission, the usual practice is to first acquire data according to the Nyquist sampling method, then compress the obtained data, and finally compress the compressed data For storage or transmission, obviously, this method causes a large degree of waste of resources
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[0010] An audio signal compression sampling system, comprising a mixer 4, the input of the mixer 4 receives a random pulse signal and an audio signal to be modulated, and the output of the mixer 4 passes through a low-pass filter 5 and an inverting amplifier 6 Connected, the inverting amplifier 6 is connected to the computer through the A / D converter 7. It also includes a single-chip microcomputer 1, the output end of the single-chip microcomputer 1 is connected to the input end of the active amplifier 2, the output end of the active amplifier 2 is connected to the input end of the accumulator 3, and the input end of the accumulator 3 is also connected to the offset level signal, The accumulator 3 outputs a random pulse signal to the input of the mixer 4, such as figure 1 shown.
[0011] The present invention is mainly composed of three parts: modulation, filtering and down-sampling. The sparse signal on the Fourier basis can evenly smear the input analog audio signal to the ...
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The invention relates to an audio signal compressing and sampling system. The system comprises a frequency mixer, wherein an input end of the frequency mixer receives a random pulse signal and a to-be-modulated audio signal; an output end of the frequency mixer is connected with a reversing amplifier through a low-pass filter; and the reversing amplifier is connected with a computer through an analog / digital (A / D) converter. The system is designed according to a compressed sensing theory; and a down sampling process is performed in the way that: information of an original signal can be acquired by uniformly coating the analogue audio signal in an entire frequency domain range by modulation and sampling the demodulated signal with low sampling frequency. A part of signal is intercepted by filtering the signal with a filter with low cut-off frequency. The filtered signal comprises the information of the original signal; and then the signal is reconstructed by using a compressed sensing theory-related reconstruction algorithm. Because the sampling frequency required by the compressing and sampling system is greatly reduced, the system reduces the hardware cost of a sampling switch and the channel transmission load.
Description
technical field [0001] The invention relates to an audio signal compression sampling system. Background technique [0002] The theoretical basis of the traditional signal acquisition, encoding and decoding process is Shannon sampling theorem, which samples the input analog signal at a frequency twice the highest frequency of the signal, and then transmits, processes, and processes these data according to actual needs. This processing method definitely has the following two defects: First, in many practical applications, the sampling rate of the signal must not be lower than twice the signal bandwidth, which makes the hardware system face a great pressure on the sampling rate. Nyquist sampling hardware The cost is expensive, the acquisition efficiency is low, and in some cases it is even impossible to achieve; second, in terms of data storage and transmission, the usual practice is to first acquire data according to the Nyquist sampling method, then compress the obtained data...
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IPC IPC(8): G10L19/00G10L19/26
Inventor 方杰樊敏韦穗
Owner ANHUI UNIVERSITY