multiple echoes

"On the side of a PBX or bureau switch, a small amount of electrical energy is not fully converted and returned along the original path to form an echo." If the caller is not far from the PBX or switch, the Echo returns quickly and the human ear

When you write a shell script that starts with the Crontab timer task, if the shell script execution time exceeds, Crontab pulls the script time interval, this time may appear the same script simultaneously initiates several times the phenomenon.

target reflection echo detection algorithm and its FPGA implementation One: Algorithm OverviewA time ago, a project was contacted with a sonar target reflection echo detection. The core function of the sonar receiver is to recognize the echo of the

First, the concept1.HTTP protocol: Hypertext Transfer Protocol (Hypertext Transfer Protocol). Is a rule that specifies the communication between the browser and the Web server, which allows Hypertext Markup Language (HTML) documents to be routed

First, the concept1.HTTP protocol: Hypertext Transfer Protocol (Hypertext Transfer Protocol). Is a rule that specifies the communication between the browser and the Web server, which allows Hypertext Markup Language (HTML) documents to be routed

This article mainly introduces examples of shell programmingFirst, the logical judgment if statement 1. Judging the age?[[email protected] 9_1 ]#cat iftest.sh #!/bin/bashread -p "Please input your age:" age ## 判断用户输入的必须是数字if [[ "$age" =~ ^[0-9]

First, prefaceto understand echo cancellation technology, we have to mention the theory of digital signal processing as the theoretical basis of modern communication technology. First of all, there is an important branch of the digital signal

Acoustic echo refers to the sound that the speaker plays out and sends back to the far end when the microphone is picked up, allowing the remote interlocutor to hear his or her voice. Acoustic echoes are also divided into direct echoes and indirect

Perhaps a lot of webmasters have not heard of echoes SEO and text seo, in fact, these two major SEO is the necessary knowledge of the site I, the so-called echo SEO is required webmaster in the setting of the website optimization mode must consider

First, because of the work of the relationship, the author since 2004 contact Echo cancellation (echo cancellation) technology, and has been engaged in a large communications enterprises with ECHO cancellation technology related work, the echo