原文出自美國音響網站audioasylum ，翻譯後放在MYAV，原作者為美國音響廠商。

HDMI is an abortion of an interface that was crammed down our throats by Sony and Hollywood. Silicon Image was the party that made it all possible.

HDMI由Silicon Image（美國矽映電子科技）研發成功，但是是一個失敗的傳輸介面，並由Sony與好萊塢強迫我們接受。

The idea by Sony was to have the audio and the video both on the same cable, to avoid confusing the schmucks who buy their Sony TV sets at Best Buy and can't figure out how to connect it. Hollywood demanded "content protection", and it was decided that HDCP as developed by Intel would suffice. Silicon Image was determined to develop the silicon chips so that they could cash in on the cash cow.

Sony的原意是讓影像及音效使用同一條傳輸線，目的是避免一些笨蛋從Best Buy買了Sony電視後卻不會接線，好萊塢則需要『內容保護』，並認為由Intel研發的HDCP足以滿足這個需要，Silicon Image（美國矽映電子科技）決定研發出這種矽晶片，這樣大家都能從這棵搖錢樹上撈錢。

Of the many problems associated with HDMI, the audio quality is totally handicapped for lack of -- a pin! They designed the connector before they finished designing the system. They didn't have enough pins to also have a master audio clock.

HDMI本身有許多問題，音質等同殘廢，因為少了一根PIN，他們在整個系統研發完成之前，就先設計好了連接介面，由於PIN的數目不足，所以沒有辦法處理音頻的時鐘。

So with HDMI, the audio clock is derived from the video clock. For high-def TV, the video clock runs at either 74.25 MHz or 74.25 * (1000/1001) [thank you NTSC!!!]. The audio clock runs at multiples of 48 kHz. Of course, these are not related. So the receiver has a PLL to regenerate an audio clock based on instructions from the transmitter (source) telling it what to do.

HDMI的音頻時鐘是由影像時鐘所導出的。在高畫質的電視，影像時鐘大約跑74.25MHz或74.25* (1000/1001)『都怪NTSC』，音頻的時鐘則是跑48khz的倍數，想當然耳，二者毫無關連，所以環繞擴大機裡有一個PLL（Phase Locked Loop：鎖相迴路），根據原來的音效來重整音頻時鐘。

The result is the worst jitter of any system yet invented. It truly sucks.

結果是產生了一個前所未有的，最爛的jitter系統。

Much later, they added a thing called Audio Rate Control in HDMI 1.3a. This puts a buffer and the master audio clock in the receiver. Then commands are sent upstream on the CEC line telling the player to speed up and slow down as necessary to keep the buffer full.

過了一段時間，他們在HDMI-1.3a裡增加了一個叫做Audio Rate Control（ARC：音頻速度控制）的東西，就是在環繞擴大機裡放了一個音頻緩衝器以及一個音頻時鐘，然後從CEC通道傳送逆向流，來指令播放器根據需要來加速或減速，以求填滿緩衝區。

The only people to use this are Sony (HATS) and Pioneer (PQLS), but both use proprietary implementations that prevent use with other equipment.

唯一採用這項技術的是Sony的HATS系統和Pioneer的PQLS系統，但是都為專用方案，不能使用於其他設備。

And the fee for using this pile of steaming dog dung? $30,000 per year in licensing fees. It's a beautiful world, no?

使用這些狗屎技術的授權費用為每年3萬美元，這真是個美好的世界，不是嗎？