Noise measuring system based on digital signal processing and method

Abstract

The invention discloses a noise measuring system based on digital signal processing and a method; the system comprises a microphone, an amplifier, an AD sampling module, a digital signal processor and a singlechip which are sequentially connected; the microphone is used for collecting sound signals and converts the sound signals to analog voltage signals; the amplifier is used for reducing the impedance of the voltage signals so as to obtain low impedance voltage signals; the AD sampling module converts the low impedance voltage signals to the digital signals; the singlechip is used for obtaining calculating parameters needed by sound pressure level calculation and issues interrupt signals to the digital signal processor; and the digital signal processor is used for responding the interrupt signals, and carrying out sound pressure level calculation on the digital signals to obtain sound pressure level. The noise measuring system based on DSP and the method provided by the invention have simple hardware connection, easy realized arithmetic, wide dynamic range and high measuring accuracy.

Description

technical field [0001] The invention relates to a digital noise measurement system, in particular to a noise measurement system and method based on digital signal processing. Background technique [0002] Traditional noise measurement systems such as figure 1 As shown, the analog circuit is used to realize signal filtering, sound pressure level algorithm and weighting network. Its operation speed is slow, precision is low, dynamic range is small, power consumption is large, and its function is single. [0003] In recent years, with the rapid development of microelectronics and integrated circuits, some digital noise measurement systems have emerged. Compared with traditional noise measurement systems, their computing speed, accuracy, and dynamic range have been improved. However, due to the design of noise measurement systems For example, the selected processors are mostly processors with poor digital signal processing capabilities such as single-chip microcomputers, and th...

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Problems solved by technology

[0002] Traditional noise measurement systems such as figure 1 As shown, the analog circuit is used to realize signal filtering, sound pressure level algorithm and weighting network, which has slow operation speed, low precision, small dynamic range, large power consumption, and single function

[0003] In recent years, with the rapid development of microelectronics and integrated circuits, some digital noise measurement systems have emerged. Compared with traditional noise measurement systems, their computing speed, accuracy, and dynamic range have been improved. However, due to the design of noise measurement systems For example, the selected processors are mostly processors with poor digital signal processing capabilities such as single-chip microcomputers, and the sampling frequency range of the AD sampling module is small, and the sampling accuracy is low, and the analog time meter is still used in the system Weight network and octave analysis module, when implementing noise measurement, the algorithm is complex, the dynamic range is small, the frequency range of the measured signal is also limited, and the accuracy is difficult to meet the requirements

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