Sawstudio

SAW 内部精度是多少?

~~~~~~~~~~~~~~~~~~~~8BIT HEADROOM????????

The internal data is stored at 24 bits always... even 16 bit data is shifted up to 24 bits with zeros in the bottom bits to start out with.

From that point on, as things are processed and reverb is added and data is mixed together, the lower bits start to develop into real data, no longer remaining zeros.

All internal math is processed using 64 bit integer multiplies and divides... this actually takes things beyond many dsp chip processing capabilities. The eq uses certain algorithims processed in floating point, all of which are still written and handled in assembly language.

The internal summing bus stores data in 32 bit DWORDS, which allows for an internal summing of 128 tracks at full digital clipping without overload.

Now that you know all that, does it really matter... NO... use your ears.. that is what matters... the results are what is important... and SAWStudio, without a doubt, can deliver analog smooth sound at any resolution, if you do not trash the data with too many outside processing algorithims that switch it back and forth to floating point.

Bob L

翻了以下最重要部份:-

1) 所有內政部計算和處理都是 64BIT 定點, 實際上已超越了很多 DSP的處理能力。
2) SUMMING BUS 以 32BIT dwords 儲存數據, 容許 內部全 128軌在數字0db時不都會過載。 (超強!! , 也了解到為何 bob 不增加 MT 的軌道)
3) 這些重要嗎? 不, 用你們的耳朵吧, 結果才是最重要!!  (其實純以數字看, 現階段 sawstudio 已是音頻工業標準的極限, 但bob仍堅持以耳朵監聽為基礎)




[ 本帖最后由 himhui 于 06-12-13 15:30 编辑 ]

T-RACK 的 所謂 8 BIT HEADROOM 應該是指 32BIT 浮點運算下的 8BIT, 多翻看到 BOB K , BRUCE SWEDEN 等人否定了這32BIT浮點運算 (24BIT + 8BIT) 這8BIT 的實際用途。

[ 本帖最后由 himhui 于 06-12-13 10:15 编辑 ]

谢谢HIMHUI老师，受用了。

迷糊学习中，感谢himhui老师

~~~~~~~~~~~~~~~~~~~~~~~~~~~~原来8BIT是这个意思哇

这个8BIT是否等于 48DB？

T RACK 并为提到 这个 但是实际 在表下 过载 听感并无失真  那是否就不用特别顾及 表变红了呢 也就是说 有个别的地方红了(比如说就一个地方过了一下) 也可以不重新调整  均衡 压缩和限制器呢?   
再说到 SAWSTUDIO 其实发这个帖子之前 特意的留意了一下 HAEDROOM 与信噪比的那篇文章   但是还是不解的HEADROOM 在BOB的解释下 实际用途是什么呢?
我平时 只是理解 不必为个别轨道 出现表红而担心 过载 实际听感确实也没有过载

在初期數字世界是沒有headroom的, peak meter 0db 或以上就是過載 , 故此 bob katz (bob katz 和 bob lentini 是分別兩個人)提出了k-system, 設定k-system 0 db 位置,  headroom就在 k-system 的 0db 和 peak 0db之間。

[ 本帖最后由 himhui 于 06-12-13 15:30 编辑 ]

。。。。。明白！

  


There is no A/D converter in the world which actually outputs floating as a format, in fact, there is no reason to do so, as the entire outside world can fit comfortably within about 20 bits. And most A/Ds only have an SNR approaching 20 bits, so 24 bits fixed is more than enough

There is NO BENEFIT WHATSOEVER in recording to 32 bit float format and at least one drawback (additional storage space). Any DAW that requires you to do so in order to perform its operations more efficiently is just doing it wrong. 32 bit float is a CALCULATION-BASED format and is only useful to store intermediate calculation products that you intend to use again later. For example, if you apply a plugin to something and want to store the output of the process, it is useful and avoids degradation. Other than that, 32 bit as a storage format is useless.

根據 bob katz 的 說法, 真實世界是沒有 A/D 轉換器輸出以 32bit 浮點作為格式 ,  20bit來說已可滿足到現實, 24bit 定點已高於實際須要。這個8bit 是為了儲存暫時如插件的運算, 在須要時才拿來用, 基本對於檔案儲存格式是沒有用處。

[ 本帖最后由 himhui 于 06-12-13 15:32 编辑 ]

哦 继续了解中........ 感谢斑竹 十分感谢!

而且BOB K和其他人对PEAK的解释也有不同，一般情况下的HEADROOM是AVG到CLIPPING之间的距离，而BOB K的HEADROOM的距离是PEAK到CLIPPING的距离。

这个概念应该就是K-SYSTEM这样设置的一个概念吧~

In the case of Bob Lentini's SAWStudio: yes, I can confirm via many internet conversations with Bob that it currently uses 64bit integer math for all multiples and divides (except for the built in eq's which use 64bit floating point math) which return an undithered full 32bit DWORD (instead of the 24bit + 8bit mantissa of a 32bit IEEE file) and pass this on to the next process in line - until final output, where the end user has the option of either truncating or dithering to 24bit.

SAWStudio achieves its incredible cpu efficiency due to having its engine hand coded in assembly language (the entire program install file is under 4megs!), and by having many of its calls bypass Windows' various shells and instead address the machine more directly. While it is certainly not well known, and does not do things in an "orthodox" manner typical of most DAW apps, I find that it is an extremely elegant piece of coding, and by far my favorite DAW app to work in.

Best regards,
Steve Berson

HOHO SAW是用64定点哦， 64bit integer ，EQ用了一点浮点