什麼是音頻?

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什麼是音頻?

音頻是指我們聽到的聲音。它涵蓋從音樂和語音到音效和環境噪音的一切。本質上,它是任何類型聲音的聲音表示。

音訊是如何創建的?

音訊是透過捕獲或產生聲波來創建的。這些聲波可以由樂器、聲音或任何其他聲源產生。麥克風通常用於捕獲音頻,將聲波轉換為可以處理和儲存的電信號。

什麼是類比音訊?

類比音訊是指將聲音表示為連續的電訊號。在類比音訊中,聲波直接轉換為電壓變化,然後可以透過揚聲器或耳機放大並播放。

什麼是數位音訊?

數位音訊是使用二進位代碼來儲存和傳輸音訊訊息的聲音表示形式。在數位音訊中,連續的類比聲波被轉換為一系列數位樣本,可以使用數位技術進行處理、儲存和傳輸。

數位音訊如何運作?

數位音訊的工作原理是定期對類比音訊訊號進行採樣。每個樣本代表該時刻聲波的振幅。然後這些樣本被轉換成二進制數,可以由電腦和其他數位設備處理和儲存。

數位音訊相對於類比音訊有哪些優勢?

與類比音訊相比,數位音訊具有多種優勢。首先,它可以更精確地再現聲音。數位音訊的儲存、操作和傳輸也變得更加容易。此外,可以使用各種軟體工具輕鬆編輯和處理數位音訊。

什麼是音頻取樣率?

音訊取樣率通常以赫茲 (Hz) 為單位測量,表示每秒擷取的音訊取樣數。更高的取樣率意味著採集更多樣本,從而獲得更好的保真度並捕捉高頻聲音。常見的取樣率包括 44.1 kHz(CD 品質)和 48 kHz(用於大多數數位音訊格式)。

什麼是音訊壓縮?

音訊壓縮是減少音訊資料檔案大小的過程。它是透過從音訊訊號中去除冗餘或不必要的資訊來實現的。壓縮可以是有損的,其中一些音訊資料被永久丟棄,也可以是無損的,其中原始音訊資料可以完美地重建。

有損音訊壓縮如何運作?

有損音訊壓縮的工作原理是丟棄感知上不太重要的音訊資料。這是透過應用利用人類聽力心理聲學特性的各種演算法來完成的。透過刪除不那麼引人注目的數據,有損壓縮可以顯著減小檔案大小,同時保持可接受的音訊品質。

有哪些流行的音訊檔案格式?

一些流行的音訊檔案格式包括 MPEG 音訊層 3 (MP3)、波形音訊檔案格式 (WAV)、免費無損音訊編解碼器 (FLAC)、增強和替代通訊 (AAC) 和 OGG。 MP3 因其高壓縮率和相容性而被廣泛使用,而 WAV 是一種未壓縮格式,通常用於高品質音訊。 FLAC 是一種無損格式,AAC 和 OGG 以其高效壓縮而聞名。

什麼是立體聲音響?

立體聲音訊是指透過兩個獨立的音訊通道(通常稱為左聲道和右聲道)錄製、再現或播放的聲音。它在音訊中創造了一種空間感和方向性,模仿我們在現實世界中感知聲音的方式。

什麼是環繞聲?

環繞聲是一種音訊技術,透過使用多個音訊通道創造身臨其境的聲音體驗。它通常涉及將揚聲器策略性地放置在聽眾周圍,以創建三維音訊環境。環繞聲通常用於電影院和家庭劇院系統。

什麼是音效卡?

聲卡是一種硬體組件或集成電路,使電腦能夠產生和輸出音訊。它將數位音訊資料轉換為可以透過揚聲器或耳機播放的類比訊號。音效卡還可能包括其他功能,例如麥克風和樂器數位介面 (MIDI) 裝置的輸入連接埠。

音訊串流如何運作?

音訊串流是一種透過網路即時傳送音訊內容的方法。當您串流音訊時,資料會持續傳輸並在到達時進行播放。這使您可以收聽音樂、播客或任何其他音訊內容,而無需在播放前下載整個檔案。

什麼是聲波?

聲波是一種縱波,透過空氣或水等介質攜帶能量。它由壓縮(高壓區域)和稀疏(低壓區域)組成。聲波的特性(例如頻率和振幅)決定了我們如何感知聲音。

振幅與聲波的關係為何?

振幅是指聲波相對於其靜止位置的最大位移。簡單來說,它代表聲音的響度或音量。較大的振幅對應於較大的聲音,而較小的振幅則導致較柔和的聲音。

什麼是音訊處理中的延遲?

音訊處理中的延遲是指音訊訊號的輸入與其對應的輸出之間的延遲。它可能發生在各個階段,例如音訊的錄製、播放或處理。高延遲可能很明顯,並會影響現場表演或語音通訊等即時應用程式。

什麼是音訊中的均衡器 (EQ)?

EQ 是一種用於調整音訊頻率響應的裝置或軟體工具。它允許您增加或減少特定頻段的音量,這對於微調聲音或補償音響系統中的缺陷非常有用。

什麼是樂器數位介面 (MIDI) 控制器?

MIDI 控制器是一種可讓您控制支援 MIDI 的軟體或硬體樂器的裝置。它通常具有按鍵、打擊墊、旋鈕或滑桿,可發送 MIDI 資料以觸發聲音、更改設定或控制音樂製作或表演中的各種參數。

什麼是音訊辨識?

音訊識別,也稱為音訊內容分析,是一個專注於識別和分類音訊訊號的研究和技術領域。它涉及使用演算法和機器學習技術來分析音訊資料並提取有意義的信息,例如識別特定聲音或對音樂流派進行分類。

什麼是語音辨識技術?

語音識別技術,也稱為語音識別,使電腦或設備能夠解釋和理解口語。它將口語轉換為文字或根據語音命令執行操作。語音辨識可應用於虛擬助理、聽寫軟體和自動化客戶服務系統。

什麼是音頻處理?

音頻處理是指使用各種技術和演算法來操縱、修改或增強音頻訊號。它涉及濾波、均衡、壓縮、混響和時間拉伸等操作。音訊處理可以在現場表演期間即時完成,也可以作為錄音室後製的一部分。

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