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認識一下 bit.......learn a bit of bit...
The word "bit" is used in a number of contexts in digital audio. Such as:
* the bit depth of an audio file (i.e. 16bit, 24bit). Each bit is nominally 6dB worth of dynamic range - so 16bits gives you a theoretical 96dB worth of dynamic range while 24bit gives you a whopping 144dB (where as human hearing at the very best has 120dB worth of dynamic range). It's important to realize that even 32bit audio files are output by all modern proaudio Digital to Analog Converter at 24bits. The reason that no DAC ever needs to be designed to actually output at 32bits is that the least significant 24th bit is very well below the noise floor of any environment, and also well below the human ear's ability to detect sound.
* the bit depth of the internal processing math (which can either be floating point or fixed point). What this means is how many digits calculations occur at - bigger bit depths (i.e. more digits to work with) means more precise calculations. SAW uses 64bit fixed point math for its multiplication and division. Most other native PC based DAW apps use 32bit floating point for this. The SAWStudio built in eq, the Anwida and JMS Audioware SAW native plugins, and some of the filter codes used in the Sonoris SAW native plugins use 64bit floating point math.
* the bit depth of the returned figures after a DSP has been performed - i.e. after a signal process is done, how many digits are passed to the next signal process prior to output. In SAW this is at 32bit fixed point using the full DWORD. With most other PC based DAW appps this is a 24bit + 8bit mantissa 32bit IEEE floating point file.
* the bit depth of a computer's buss, cpu, or OS - basically the allowable throughput of data chunks the cpu or buss or OS can pass or process at once. Bigger depths for these functions means more calculations can occur at once - so you get faster speeds - but it does not necessarilly mean that the quality of calculations has changed as this is dependent on the processing algorithm being run. A 32bit OS (such as Windows 2000) can still perform calculations using 64bit math!
Hope that helps.
Best regards,
Steve Berson
[ 本帖最后由 himhui 于 07-8-30 18:08 编辑 ]
問:
Now there are DAW's out there that claim a 64 bit engine. This is what I am talking about.
Steve thanks for that info. I have read what you say about SS's 64 bit math but I don't understand why its called a 24 bit engine? And what about these DAW's with 64 bit engines?
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答 :
It's called MARKETING. All of these DAWapps ultimately output audio at 24bits. In between that any time you make an actual process change (i.e. pull up or down a fader, sum some tracks together, adjust a plugin, etc.) processing math happens. SAW does it with 64bit fixed point math for most calculations and returns a full 32bit dword that is passed to the next process. The end result: more precision, less rounding errors, and (to my ear) better sounding mixes and masters. Bob has chosen not to focus on a number to hype on the page you are referring to. Other DAW app makers instead focus on a bigger number in their hype in order to hook people who believe "more is more" but don't take the time to really understand what is going on "under the hood."
Best regards,
Steve Berson
Now there are DAW's out there that claim a 64 bit engine. This is what I am talking about.
Steve thanks for that info. I have read what you say about SS's 64 bit math but I don't understand why its called a 24 bit engine? And what about these DAW's with 64 bit engines?
-----------------------------------------------------------------------------------------------------------------------------------------------------------
答 :
It's called MARKETING. All of these DAWapps ultimately output audio at 24bits. In between that any time you make an actual process change (i.e. pull up or down a fader, sum some tracks together, adjust a plugin, etc.) processing math happens. SAW does it with 64bit fixed point math for most calculations and returns a full 32bit dword that is passed to the next process. The end result: more precision, less rounding errors, and (to my ear) better sounding mixes and masters. Bob has chosen not to focus on a number to hype on the page you are referring to. Other DAW app makers instead focus on a bigger number in their hype in order to hook people who believe "more is more" but don't take the time to really understand what is going on "under the hood."
Best regards,
Steve Berson
)。
I have read what you say about SS's 64 bit math but I don't understand why its called a 24 bit engine? And what about these DAW's with 64 bit engines?
我看了你所说的关于SAWStudio的64bit运算但依旧就不理解，为什么它叫做24bit引擎？并且那些具有64bit引擎的DAW是怎么样呢？
-----------------------------------------------------------------------------------------------------------------------------------------------------------
答 :
It's called MARKETING. All of these DAWapps ultimately output audio at 24bits. In between that any time you make an actual process change (i.e. pull up or down a fader, sum some tracks together, adjust a plugin, etc.) processing math happens. SAW does it with 64bit fixed point math for most calculations and returns a full 32bit dword that is passed to the next process. The end result: more precision, less rounding errors, and (to my ear) better sounding mixes and masters. Bob has chosen not to focus on a number to hype on the page you are referring to. Other DAW app makers instead focus on a bigger number in their hype in order to hook people who believe "more is more" but don't take the time to really understand what is going on "under the hood."
这就是商业。所有的这些DAW的极限输出音频格式都是24bit的。在所有的你做的实时的处理变化之中（也就是说移动推子，多个轨道的混音，以及调整插件等等），SAW在做这些的过程中绝大多数是以定点计算完成，并返回一个满32bit双精度的数据给下一个处理计算使用。结果就是：更精确、更小的误差，以及在混音和母带中更好的声音（他说他听到是这样，但是我个人也是这样觉得）。BOB没有追求你所说的那种数字上的迷信。其他DAW的设计人员却做了大量的广告来引诱那些相信“数字越大越好“的人们，他们却从不花点时间真正搞懂被隐藏在下面的实情。
Best regards,
Steve Berson
[ 本帖最后由 margindge 于 07-9-2 18:56 编辑 ]
我看了你所说的关于SAWStudio的64bit运算但依旧就不理解，为什么它叫做24bit引擎？并且那些具有64bit引擎的DAW是怎么样呢？
-----------------------------------------------------------------------------------------------------------------------------------------------------------
答 :
It's called MARKETING. All of these DAWapps ultimately output audio at 24bits. In between that any time you make an actual process change (i.e. pull up or down a fader, sum some tracks together, adjust a plugin, etc.) processing math happens. SAW does it with 64bit fixed point math for most calculations and returns a full 32bit dword that is passed to the next process. The end result: more precision, less rounding errors, and (to my ear) better sounding mixes and masters. Bob has chosen not to focus on a number to hype on the page you are referring to. Other DAW app makers instead focus on a bigger number in their hype in order to hook people who believe "more is more" but don't take the time to really understand what is going on "under the hood."
这就是商业。所有的这些DAW的极限输出音频格式都是24bit的。在所有的你做的实时的处理变化之中（也就是说移动推子，多个轨道的混音，以及调整插件等等），SAW在做这些的过程中绝大多数是以定点计算完成，并返回一个满32bit双精度的数据给下一个处理计算使用。结果就是：更精确、更小的误差，以及在混音和母带中更好的声音（他说他听到是这样，但是我个人也是这样觉得）。BOB没有追求你所说的那种数字上的迷信。其他DAW的设计人员却做了大量的广告来引诱那些相信“数字越大越好“的人们，他们却从不花点时间真正搞懂被隐藏在下面的实情。
Best regards,
Steve Berson
[ 本帖最后由 margindge 于 07-9-2 18:56 编辑 ]
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