Download >>> https://byltly.com/25qjw4
4 Microphone Array System Driver Download Win7 Loader | Loader 4 Microphone Array System Driver Download Win7 - Lately, the use of microphones has become crucial for many applications. The demand to reduce ambient noise and echo as well as increase the sound pressure level (SPL) required by users is increasing dramatically. This article will mainly focus on using a 4-microphone array system to solve this problem. After mixing, each microphone has its own frequency response, thus it is easily seen that even balanced mic arrays exhibit non-uniformities. This article will discuss how to improve the characteristics of an array system through careful placement of microphones on the front soundstage. One of the most common practice in using microphone arrays is to place them in front of a sound source. As seen above, the frequency response (the range where all microphone feed signals are linear) varies greatly depending on where on this soundstage they are placed. The first measurement that will be discussed is the frequency response at 1 kHz off axis for each array element. It is clear that the frequency response of the array is very dependent on its position in the soundstage. Array element 1 is placed in the center of the stage while element 2 and 3 are in front and right of it, respectively. The frequency response for E1 shows two peaks at approximately 400 Hz and 3 kHz. These peaks can be seen in all frequency responses for all array elements due to comb filter effect within any soundstage. The first peak, E2, is due to destructive interference between waves coming from E1 and elements 2 and 3 when they hit E2 at different times (since they are separated by 30 cm). The second peak, E3, is due to destructive interference between waves coming from E1 and 3 when they hit E3 at different times (since they are separated by 20 cm). The common solution for comb filtering is to delay the signals of one array element relative to another. This will be discussed further in another section. It can be seen that each array element shows a different frequency response depending on its position in the soundstage. This also implies that each individual microphone has a different frequency response as well, i.e., this is not an ideal balanced microphone array. The difference in frequency response between adjacent elements is known as cross-talk or crosstalk interference. This interference depends on the distance between E1 and elements 2 and 3, its frequency (determined by the source), and the angle of incidence. There are three different methods to reduce crosstalk: 1) implement a frequency equalizer to eliminate already-generated crosstalk; 2) reduce the bandwidth of each array element; and 3) decrease the size of each individual microphone (by using a lapel mic). It was observed that these frequency response measurements can be simulated using a frequency equalizer. The largest difference observed is that the effective width of each element is reduced rather than their center frequencies. This is because E1 has now been filtered out completely as observed in figure 5. eccc085e13
留言