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Since we only have two ears why multi channels audio? 既然我們只有兩隻耳朵,為什麼要多聲道音頻?

Updated: May 24

Human ears hear 360 degree sound naturally since we born. Researchers spend years study how our ears listen to the sound. The stereo and mono audio are not nature if you put them in the perspective of nature sound.

To understand the evolution of speaker technology. We first need to know how artist working on a movie or music. The composition is a form of reconstruct layers of small sound clips. Either from virtual instruments or from recorded sound. The production process is the process of rearranging those elements. To recreate immersive experience for the audiences. For this reason to recreate the nature experience is the goal of most artists. However, single speaker has a lot limitations to simulate natural sound . So the multi speaker system was born. The idea is simple. Use speakers as sound sources to recreate realist soundscape. More speakers means more details and more realistic to mimic nature soundscape. Place them on the desired locations around listeners is the key to successfully.


How multi channels audio arranged?


It is not hard to find out the answer if you put your ear close and listen to your speakers. After few minutes you will start to notice. The center speaker is for dialogue only. Left and right speakers are used to send music, background sounds, sound effects and dialogues. Left rear and right rear surround speakers are used to send environment sound, background sound and sound effects. Over all you will hear sound mostly coming from the left and right speakers. For other formats like 7.1 or Atmos are use extra speakers for sending the extension of the sound information to improve its resolution. For example: ceiling speakers will be send environment sound and if there is a moving sound effects like helicopter flying pass....etc. It is all for the quality.



Why most sound are coming from Left and Right speakers?


Let us dive a little deeper to the cinema surround sound design. We know 5.1 means 3 speakers in front, 2 on the back and one sub Bass speaker. But why? To explain this we need to look back the history of the cinema sound design evolution through out years. No matter how many speakers or audio channels the sound designer is using. There are only left and right stereo channels are used mostly. This is because a very good reason. That is the screen in the front of all listeners. The screen is only display certain coverage of the image. Most screen can only cover up to 120 degree of your eye's view angle. There is no need for the sound to be play outside of this area since there is no image. Also the film makers want you to focus on the front instead of to turn your head to look behind and missed whats main characters are doing. This is important as part of the cinema story telling. For the music the situation is even easier to understand. The lead signer is at the front with band members. There is nothing on the sides or behind.


Nowadays new concept of immersive object based surround sound is getting popular. This means to put you in the scenes use immersive sound. In another word, use 3D audio to let you feel that you are there in the scenes of the film or with the band in the live venue. However, only with headphones this is easy to achieve. If you would like immersive audio from YouTube to playback from your laptop speakers. You are having the same issue with the lacking audio channels to send audio signals.


Alternative Solution to Realistic audio !!


OPSIS II speaker is designed to provide an alternative solution to surround sound playback issues. OPSIS II's internal spatial decoding technology use two channels input audio to recreate 360 degree immersive nature realistic sound. This means you don't need to worry about audio codecs or hardware set ups. OPSIS II will recreate 360 degree realistic audio from all stereo audio inputs. The efficiency of recreated quality is depends only on the artist's original sound recording and production quality. For example: if more audio information and layers been put in for the final mater sound tracks higher the realistic 360 sound details OPSIS II can playback.


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自我們出生以來,人耳會自然聽到360度的聲音。 研究人員花了多年的時間研究我們的耳朵如何聽聲音。 如果將立體聲和單聲道音頻放在自然聲音的角度來看,它們並不是自然的。

了解揚聲器技術的發展, 我們首先需要知道藝術家如何製作電影或音樂。 聲音創作是運用來自虛擬樂器或錄製的聲音由小聲音片段重建層的一種形式。 生產過程是重新排列這些元素的過程為觀眾創造身臨其境的體驗。 因此,重現自然體驗是大多數藝術家的目標。 但是,單個揚聲器在模擬自然聲音方面有很多限制。 因此,多揚聲器系統誕生了,這個想法很簡單,使用揚聲器作為聲源再現真實的音景。 更多的揚聲器意味著更多細節和更多逼真的模擬自然音景,將它們放置在偵聽器周圍的所需位置是成功的關鍵。


如何安排多聲道音頻?

如果您將耳朵靠近並聆聽揚聲器,就不難發現答案。幾分鐘後,您將開始注意到:中央揚聲器僅用於對話。左右揚聲器用於發送音樂,背景聲音,聲音效果和對話。左後置和右後置環繞揚聲器用於發送環境聲音,背景聲音和聲音效果。總的來說,您將聽到聲音主要來自左右揚聲器。對於7.1或Atmos之類的其他格式,請使用額外的揚聲器來發送聲音信息的擴展信息,以提高其分辨率。例如:吸頂揚聲器將發送環境聲音,如果有動感的音效,例如直升機飛行通行證等,一切都是為了質量。

為什麼大多數聲音都來自左右揚聲器?


讓我們更深入地了解電影院的環繞聲設計。我們知道5.1表示前面有3個揚聲器,後面有2個揚聲器和1個次低音揚聲器。但為什麼?為了解釋這一點,我們需要回顧過去幾年電影聲音設計發展的歷史。無論聲音設計師使用多少揚聲器或音頻通道,大多數只使用左右立體聲通道,因爲那是所有聽眾面前的屏幕,屏幕僅顯示圖像的某些覆蓋範圍。大多數屏幕最多只能覆蓋您眼睛的120度視角,由於沒有圖像,因此不需要在該區域之外播放聲音。電影製片人還希望您專注於正面,而不是轉過頭向後看,而錯過主要角色在做什麼。這是電影故事講述的重要部分,對於音樂,情況甚至更容易理解,領隊表演者在樂隊成員的最前面,側面或後面沒有任何東西。

如今,基於對象的沉浸式環繞聲的新概念正變得越來越流行。 這意味著要在場景中使用沉浸式聲音。 換句話說,使用3D音頻可以讓您感覺自己在電影場景中或樂隊在現場的現場。 但是,僅使用耳機即可輕鬆實現。 如果您想從YouTube上沉浸式音頻通過筆記本電腦的揚聲器播放。 由於缺少用於發送音頻信號的音頻通道,您仍然遇到同樣的問題。


逼真音頻的替代解決方案!


OPSIS II揚聲器旨在為環繞聲播放問題提供替代解決方案,OPSIS II的內部空間解碼技術使用兩個通道的輸入音頻來再現360度沉浸式自然逼真的聲音。 這意味著您無需擔心音頻編解碼器或硬件設置。 OPSIS II將從所有立體聲音頻輸入中重新創建360度逼真的音頻, 再現質量的效率僅取決於藝術家的原始錄音和製作質量。 例如:如果為最終的母音軌添加了更多的音頻信息和層次,則OPSIS II可以播放逼真的360聲音細節。


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