為解決此噪聲問題，我們通過從電池直接饋電為麥克風創(chuàng)建干凈的3.3v電源，我們使用LC濾波器對其進行濾波，然后將其傳遞至低壓降穩(wěn)壓器。這為我們提供了一個非常好的，干凈的麥克風電源，從而消除了很多噪音問題。
所有的代碼都在GitHub上-它應該是不言自明的，但是我將在這里給出高層次的概述。
這個項目的主要挑戰(zhàn)是如何將音頻從一個對講機廣播到所有其他對講機。
我已經(jīng)以兩種不同的方式實現(xiàn)了這一點。您可以使用簡單的哈希定義輕松地在代碼之間切換。
第一種方法是使用UDP廣播。UDP廣播是一種非常簡單的機制。您將UDP數(shù)據(jù)包發(fā)送到一個特殊的IP地址，并且您的路由器將該數(shù)據(jù)包廣播到網(wǎng)絡上的所有其他設備。
我們可以安全地在UDP數(shù)據(jù)包中發(fā)送多達1436個字節(jié)，因此，如果我們以16KHz采樣并使用大約90ms音頻數(shù)據(jù)的8位采樣。因此，我們需要每秒發(fā)送大約11個數(shù)據(jù)包。這完全在ESP32的功能范圍內(nèi)。
使用廣播UDP的優(yōu)點是，我們不需要了解對等方，我們只需廣播一條消息，任何正在監(jiān)聽它的人都會收到它。我們也不需要所有都連接到的集中式服務器。所有繁重的工作都由路由器完成。
但是，我們應該意識到UDP的一些缺點：
UDP數(shù)據(jù)包的傳遞僅是的努力-無法保證有人會收到您發(fā)送的數(shù)據(jù)包。
也無法保證數(shù)據(jù)包的順序-有人可能會完全隨機地接收您發(fā)送的數(shù)據(jù)包。
對于這個項目，我選擇忽略這兩個問題。對于廣播數(shù)據(jù)包，我們通常會停留在同一網(wǎng)絡中，因此我們可能不會丟失太多數(shù)據(jù)包，并且我們的數(shù)據(jù)包也可能會以正確的順序出現(xiàn)。如果他們不這樣做，那么我們只會在音頻上產(chǎn)生一點噪音和失真。
UDP廣播的另一個主要優(yōu)點是您可以在臺式計算機或電話上接收數(shù)據(jù)包-因此創(chuàng)建不基于ESP32的其他客戶端非常容易。
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