TH67807B - How to calibrate microphones with a discrete time filter pattern - Google Patents

Abstract

------ 10/19/2018 ------ (OCR) page 1 of number 1 page invention summary The invention offers a new method for microphone calibration with a non-filter pattern. Continuous way By applying signal processing techniques and signal replication at It is obtained from the microphones in the time domain as a time discrete filter. Which enables Easy to find the desired average with the least squares method. And from the sample, the results showed that Under suitable parameter modification conditions and conditions Microphone calibration with The time-lapse filter pattern yields satisfactory results. Calibrating microphones with a discrete time filter pattern Can be performed in both rooms Flares on an anechoic chamber or in an open, unobstructed environment around The area to be tested or there is a slight obstruction around it. Test area and can Processing the signal on the receiving side by programming the complex software on the computer. Non-computational Also in cost terms Due to the method of calibrating the microphone with the pattern Time-discrete filters Can be operated in an open environment Resulting in reducing expenses that will be incurred When tested in an anechoic chamber, the invention of the microphones calibration with a time-discrete filter pattern was able to Optimally Practical and Practical ------------ This invention offers a new method for microphone calibration with a non-filter pattern. Continuous way By applying signal processing techniques and signal replication at It is obtained from the microphones in the time domain as a time discrete filter. Which enables Easy to find the desired average with the least squares method. And from the sample, the results showed that Under suitable parameter modification conditions and conditions Microphone calibration with The time-lapse filter pattern yields satisfactory results. Calibrating microphones with a discrete time filter pattern Can be performed in both rooms Flares in an ancchoic chamber or in an open environment with no obstructions around it. The area to be tested or there is a slight obstruction around it. Test area and can Processing the signal on the receiving side by programming the complex software on the computer. Non-computational Also in cost terms Due to the method of calibrating the microphone with the pattern Time-discrete filters Can be operated in an open environment Resulting in reducing expenses that will be incurred When tested in an anechoic chamber, the invention of the microphones calibration with a time-discrete filter pattern was able to Can be used in practice properly

Claims (1)

Disclaimer (all) which will not appear on the advertisement page. : ------ 19/10/2018 ------ (OCR) Page 1 of 2 pages Disclaimer 1. How to calibrate the microphone with a non-continuous filter pattern. time It is composed of a computer (1) on the sender side, generating a test audio signal through an amplifier connected to the speaker (2) where the sound signal is transmitted over the air (3) a microphone. (4) on the receiving side It is connected to the computer (5), it receives the said audio signal and is captured by the sound card on the motherboard. Of the computer Which serves to convert audio signals into digital data To store it in memory Of the computer To process the signal and display the result By means of the said It consists of a procedure of - receiving and recording data (8) to receive the audio signal from the speaker and record it. The signal received from the test microphone and the reference microphone in the data file format - preparing data for processing (9) to select the data range of the signal received from Reference microphones and test microphones - signal replication in a time-discrete filter form (10), characterized by signal replication as a time discrete filter. To show the relationship of the signal Obtained from the test microphone, the name is caused by the convolution between the channel response and the The signal received from the reference microphone. Under the conditions Reference microphones have a smooth spectrum throughout. Frequency range of interest - Calculation of the channel response of the test microphone (11) by taking the signal information. Obtained from test microphones and reference microphones, which were obtained by means of in Signal replication in Time Discrete Filter Pattern (10) to calculate the channel response of the test microphone - Filter calculation for compensating for the distortion of the signal obtained by the test microphone (12) obtained from A path for calculating the channel response of the test microphone to calculate a filter for compensating for the distortion of the signal received by the test microphone. The method of calculating the filter for compensating for the distortion of the signal received from the test microphone (12) is applied to the signal received from the test microphone. To compensate for the distortion of The signal received from the test microphone (13) Page 2 of the number 2. Page 2. Method of microphone calibration with a non-continuous filter pattern according to claim 1. Calculation of the test microphone channel. 11 can be calculated from the least square method (The least square) dongni htest = (^ ref ^ ref) ^ ref y test 3. How to calibrate the microphone with a time-continuous filter pattern. According to claim 1, the calculation of the filter for compensating for the distortion of the signal received from the test microphone 12 can be calculated using the least square method as follows: g = (nLtH, es, V. \ 'nJes ,? 4. How to calibrate the microphone with a non-continuous, time-lapse filter pattern according to claim 1. The test of the signal obtained from the test microphone after the microphone was calibrated by Determination of Power Spectral Density Estimate of signal and auditory quality ------------ 1.How to calibrate a microphone with a time discrete filter pattern Consisting of a computer (1) on the sender side generates a test audio signal through an amplifier connected to the speaker (2) where the audio signal is transmitted over the air (3) where there is a microphone (4). ) On the receiving side at It is connected to the computer (5), it receives the audio signal and is stored with the sound card on the computer's motherboard, which converts the sound to digital data. To store in the memory of the machine Such computer To process the signal and display the result By the way It consists of a procedure of - receiving and recording data (8) to receive the audio signal from the speaker and record it. Audio signal received from test and reference microphones as data files - Preparing data for processing (9) to select the range of audio signals received from Reference microphones and test microphones - signal replication in a time-discrete filter format (10). The signal is replicated in a time-discrete filter form. To show the relationship of the signal Obtained from the test microphone, which is caused by the convolution between the channel response and The signal received from the reference microphone. Under the conditions Reference microphones have a smooth spectrum throughout. Frequency Range of Interest - Calculation of the test microphone channel (11) by taking the information of the received signal. From the test microphone and the reference microphone, obtained from the Signal replication in the form Time-discrete filters (10) to calculate the channel response of the test microphone - Filter calculation for compensating for the distortion of the signal received from the test microphone (12) by taking the response. The test microphone channel was obtained by means of Calculate the test microphone channel. To calculate a filter to compensate for the distortion of The signal received from the test microphone - A filter applied to compensate for the distortion of the signal received from the test microphone, obtained from the method of calculating the filter for compensating for the distortion of the signal obtained from the test microphone ( 12) Let's apply the signal received from the test microphone. To compensate for the distortion of The signal received from the test microphone (13).