Noise audio spectrum sensor

Noise audio spectrum sensorCollect audio signals from the environment and perform frequency domain analysis to calculate the spectral amplitude distribution. Sampling frequency 25.6KHz, 128 point sampling, resolution 200Hz, output 31 frequency point amplitude, frequency point Fn=n * 200 (0<n<32), single wire RS232 interface output (38400. n.8.1).

Widely used in equipment operation monitoring links such as power transformers, motors, gearboxes, pump stations, water turbine units, oil extraction wells, mining machinery, operating tracks, arc discharge, fluid leakage, etc. It can also drive variable frequency water pump units to achieve music fountain function.

The sensor can be extended with self-produced brand Modbus, IP \ \ UDP, Wi Fi, CAN and other communication modules, and the self-produced spectrum LED display screen can intuitively display spectrum changes

Noise audio spectrum sensorOutput packet format:

Starting character 0xff (1 byte)+device identifier (8 bytes)+data length (1 byte)+frequency amplitude (31 bytes)+decimal part (16 bytes)+high CRC check value (1 byte)+low CRC check value (1 byte)

a. Starting character: 0xff

b. Device identifier 7 bytes: string "JHM-NF18", corresponding to hexadecimal data 0x4a 0x48 0x4d 0x2d 0x4e 0x46 0x31 0x38.

c. Data length 0x2f (31+16)

d. The integer part of the amplitude decibel value for 31 frequency points: frequency point F (n)=n * 200Hz (0<n<32), with amplitude units in decibels (dB).

e. The 16 byte decimal part is merged to shorten communication time. The decimal parts of frequency points F (2n) and F (2n+1) are merged into 1 byte.

f. The CRC check value is only the CRCH and CRCL of the 47 byte data portion