p********e
发帖数: 16048 | 1 问题是CD->FLAC，是不是就算选择dither，也不可能做到（因为频率一样）？
这个值得学习哈。转篇文章。
http://www.pcrecording.com/dither.htm
PCRecording.com - - What's the dither all about?
These days, many soundcards can record at up to 24-bit resolution and use a
96kHz sample rate. Many multitrack and editing software programs employ
internal processing at 32-bits and more. However, the CD standard remains at
16-bit/44.1kHz. Somehow, the DAW user has to get the 24-bit file into a 16-
bit file. So what are the options available to the DAW |
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a******s
发帖数: 4052 | 2 Dither就是为了控制分辨率转换误差而故意引入的噪音。
单纯的 CD-〉flac 应该不涉及dither的问题。至于转换得来的flac（如DVD->flac,自
录音）有没有使用dither就不得而知，除非能有原盘比较。
a
at
16-
can |
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z*****n
发帖数: 7639 | 3 从CD出来的是PCM码流，这个已经是数字信息。
从PCM压制成FLAC或者APE是无损压缩，16bit
到16bit，没有trancation，不存在dithering。
dither用在从模拟到数字转换时候，也就是
生成CD母盘的时候；或者你要把高分辨率比如
16bitPCM信号变成低分辨率信号的时候，你需
要决定如何取舍quantization noise。 |
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a******s
发帖数: 4052 | 4 这个值得学习哈。转篇文章。
http://www.pcrecording.com/dither.htm
PCRecording.com - - What's the dither all about?
These days, many soundcards can record at up to 24-bit resolution and use a
96kHz sample rate. Many multitrack and editing software programs employ
internal processing at 32-bits and more. However, the CD standard remains at
16-bit/44.1kHz. Somehow, the DAW user has to get the 24-bit file into a 16-
bit file. So what are the options available to the DAW user?
Bit Resolution: Bit resolution refers |
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p*x
发帖数: 533 | 6 "His dithering about punctuation is enough to give me fits."
他的punctuation怎么了?什么样的状态? give me fits就是让我很头疼?很担心?很生气
?到底是哪个意思? |
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e**i
发帖数: 249 | 7 这个quantize到底是怎么实现的，比如我有4个bits，我是不是把每个channel先变到0
－1的范围，然后乘以2^bits，然后
floor，再变回0－255的范围？
我按这样quantize后画面暗了很多
order dither我就完全不懂了。。。也没书可查 |
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D**********s
发帖数: 3139 | 8 音量控制对音质的影响，以前有一篇note写得不错，我找了半天才找到，其实还有用变
压器的方法，不过dac这块最保真的方法就是保持位深和标准输出电平，音量控制交给
前级和功放去管就好了，终究绕不过模拟放大这一关的。
Volume Control Technologies
Newsletter Edition:
July 2009 Issue
With the introduction of Benchmark’s HDR-VC™ (High Dynamic Range
Volume Control), many audio enthusiasts are taking another look at volume
control methods. What are the differences between the different volume
control topologies? Is one sonically superior, and why?
The important qualities to consider with respect to volum... 阅读全帖 |
|
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l****z
发帖数: 29846 | 10 How Obama Betrayed America
A policy of appeasement and intervention abets our enemies.
By David Horowitz
“If we have to use force, it is because we are America. We are the
indispensable nation. We stand tall. We see farther into the future.”
— Madeleine Albright, secretary of state (1997–2001), Clinton
administration
It is a judgment on Barack Obama’s timorous, apologetic, and irresponsible
conduct of foreign affairs that Madeleine Albright’s words, spoken little
more than 15 years ago, now sou... 阅读全帖 |
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g********2
发帖数: 6571 | 11 On Tuesday, MSNBC’s “Hardball” host Chris Matthews said that during the
Benghazi terrorist attack government officials were “dithering around.”
Matthews said, “If you had somebody, or any other American out there in the
third world, in a tricky situation, there’s a revolutionary country, and
you heard they were just under attack, and there may be some people still
alive there, wouldn’t you do everything you could, because isn’t that part
of our culture to go back and try to save our people, leav... 阅读全帖 |
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a***s
发帖数: 440 | 12 8题6Dither一下就好了，只要resolution 足够高，人眼无法看出dither noise的。而
且dither 出来的色阶要比原装的色阶要准确。便宜电视，显示器都是6bit.
resolution还低呢。
thinkpad |
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f****o
发帖数: 8105 | 14 【 以下文字转载自 WoldMiscNews 俱乐部 】
发信人: fuxeto (富士德), 信区: WoldMiscNews
标 题: 江泽民架空胡锦涛的内幕
发信站: BBS 未名空间站 (Mon Mar 23 12:17:08 2015, 美东)
胡锦涛作为中共总书记的执政时期是2002年到2012年。现在基本公认的，是江泽民在这
个时期架空了胡锦涛，使其难以施政。(GREG BAKER/AFP)
胡锦涛作为中共总书记的执政时期是2002年到2012年。现在基本公认的，是江泽民在这
个时期架空了胡锦涛，使其难以施政。江干政通过的渠道包括政治局、周永康的政法委
、军队的心腹徐才厚和郭伯雄等多个层面。
徐才厚、郭伯雄架空胡锦涛的文章，见下：
徐才厚架空胡锦涛的内幕（上）
徐才厚架空胡锦涛的内幕（下）
有关胡锦涛的几个细节
1992年10月19日上午，在中共十四届一中全会闭幕后的记者招待会上，时任中共总书记
江泽民指着胡锦涛向到场的600多名中外及港澳台记者介绍说：这个年轻人只有49岁。
来自外交部的翻译马雪松刚将江泽民的话翻成英文，会场内立即爆发出一阵哄堂大笑，
原来他将“年轻人... 阅读全帖 |
|
S****4
发帖数: 470 | 15 江泽民架空胡锦涛的内幕
胡锦涛作为中共总书记的执政时期是2002年到2012年。现在基本公认的，是江泽民在这
个时期架空了胡锦涛，使其难以施政。(GREG BAKER/AFP)
【2015年03月23日讯】（记者林锋报导）胡锦涛作为中共总书记的执政时期是2002年到
2012年。现在基本公认的，是江泽民在这个时期架空了胡锦涛，使其难以施政。江干政
通过的渠道包括政治局、周永康的政法委、军队的心腹徐才厚和郭伯雄等多个层面。
徐才厚、郭伯雄架空胡锦涛的文章，见下：
徐才厚架空胡锦涛的内幕（上）
徐才厚架空胡锦涛的内幕（下）
有关胡锦涛的几个细节
1992年10月19日上午，在中共十四届一中全会闭幕后的记者招待会上，时任中共总书记
江泽民指着胡锦涛向到场的600多名中外及港澳台记者介绍说：这个年轻人只有49岁。
来自外交部的翻译马雪松刚将江泽民的话翻成英文，会场内立即爆发出一阵哄堂大笑，
原来他将“年轻人”翻译成了“Young Woman”（女青年）。江泽民有了表现自己英语
水平的机会，用英语纠正了翻译的口误。没想到，翻译用英语重复一遍江泽民的介绍，
却仍然把“年轻人”翻译成了“Young ... 阅读全帖 |
|
S****4
发帖数: 470 | 16 江泽民架空胡锦涛的内幕
胡锦涛作为中共总书记的执政时期是2002年到2012年。现在基本公认的，是江泽民在这
个时期架空了胡锦涛，使其难以施政。(GREG BAKER/AFP)
【2015年03月23日讯】（记者林锋报导）胡锦涛作为中共总书记的执政时期是2002年到
2012年。现在基本公认的，是江泽民在这个时期架空了胡锦涛，使其难以施政。江干政
通过的渠道包括政治局、周永康的政法委、军队的心腹徐才厚和郭伯雄等多个层面。
徐才厚、郭伯雄架空胡锦涛的文章，见下：
徐才厚架空胡锦涛的内幕（上）
徐才厚架空胡锦涛的内幕（下）
有关胡锦涛的几个细节
1992年10月19日上午，在中共十四届一中全会闭幕后的记者招待会上，时任中共总书记
江泽民指着胡锦涛向到场的600多名中外及港澳台记者介绍说：这个年轻人只有49岁。
来自外交部的翻译马雪松刚将江泽民的话翻成英文，会场内立即爆发出一阵哄堂大笑，
原来他将“年轻人”翻译成了“Young Woman”（女青年）。江泽民有了表现自己英语
水平的机会，用英语纠正了翻译的口误。没想到，翻译用英语重复一遍江泽民的介绍，
却仍然把“年轻人”翻译成了“Young ... 阅读全帖 |
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P*****t
发帖数: 4978 | 17 比利时200多天无政府，愣是没事。这要放在中美早就乱了。
It's an unwieldy title but Belgium could soon be named World Champion in Not
Forming a Government. The country has been in limbo since June, with
coalition talks between the seven parties constantly breaking down. The
latest mediator, appointed by King Albert II, resigned last week,
complaining that he couldn't even get all the parties around one table. If
the politicians haven't sorted out their differences by 17 February, the
paralysis will have lasted for 250 days... 阅读全帖 |
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p****p
发帖数: 18 | 18 For Abe—determined to chart a more independent and active foreign and
defense policy for Japan—For Abe—determined to chart a more independent
and active foreign and defense policy for Japan—the dispute is almost a
crisis that if it did not exist, would need to be created..
请看这篇文章和评论
http://www.forbes.com/sites/stephenharner/2013/11/23/as-china-a
Comments:
chinditone 1 day ago
Great article. The US has indeed dithered too long and suspiciously and
biasedly on the Diaoyu – which China has picked u... 阅读全帖 |
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g**1
发帖数: 10330 | 19 http://armedservices.house.gov/index.cfm/press-releases?Content
Jan 13 2014
Committee Members React to Chinese Hyper Sonic Missile Test
McKeon, Forbes and Rogers weigh in
Washington, D.C. - House Armed Services Committee Chairman Howard P. "Buck"
McKeon, Rep. Randy Forbes (VA) and Rep. Mike Rogers (AL) issued the
following statement after learning of a Chinese hyper sonic cruise missile
test.
“While round after round of defense cuts have knocked America’s
technological advantage on its back, the... 阅读全帖 |
|
u******o
发帖数: 483 | 20 http://armedservices.house.gov/index.cfm/press-releases?Content
Jan 13 2014
Committee Members React to Chinese Hyper Sonic Missile Test
McKeon, Forbes and Rogers weigh in
Washington, D.C. - House Armed Services Committee Chairman Howard P. "Buck"
McKeon, Rep. Randy Forbes (VA) and Rep. Mike Rogers (AL) issued the
following statement after learning of a Chinese hyper sonic cruise missile
test.
“While round after round of defense cuts have knocked America’s
technological advantage on its back, the... 阅读全帖 |
|
f****o
发帖数: 8105 | 21 【 以下文字转载自 WoldMiscNews 俱乐部 】
发信人: fuxeto (富士德), 信区: WoldMiscNews
标 题: 江泽民架空胡锦涛的内幕
发信站: BBS 未名空间站 (Mon Mar 23 12:17:08 2015, 美东)
胡锦涛作为中共总书记的执政时期是2002年到2012年。现在基本公认的，是江泽民在这
个时期架空了胡锦涛，使其难以施政。(GREG BAKER/AFP)
胡锦涛作为中共总书记的执政时期是2002年到2012年。现在基本公认的，是江泽民在这
个时期架空了胡锦涛，使其难以施政。江干政通过的渠道包括政治局、周永康的政法委
、军队的心腹徐才厚和郭伯雄等多个层面。
徐才厚、郭伯雄架空胡锦涛的文章，见下：
徐才厚架空胡锦涛的内幕（上）
徐才厚架空胡锦涛的内幕（下）
有关胡锦涛的几个细节
1992年10月19日上午，在中共十四届一中全会闭幕后的记者招待会上，时任中共总书记
江泽民指着胡锦涛向到场的600多名中外及港澳台记者介绍说：这个年轻人只有49岁。
来自外交部的翻译马雪松刚将江泽民的话翻成英文，会场内立即爆发出一阵哄堂大笑，
原来他将“年轻人... 阅读全帖 |
|
l****z
发帖数: 29846 | 22 By DICK MORRIS
Published on TheHill.com on March 1, 2011
Obama's failure to support America's allies in the Middle East and his
dithering endorsement of chaos in the region will send oil and gasoline
prices skyrocketing, triggering a massive bout of stagflation. This vicious
cycle of rising prices, decreased consumption, and ever higher prices (as
vendors seek to recover higher fixed costs) will cripple the American
economy for years to come.
This is Obama's true legacy.
Consider what he has don... 阅读全帖 |
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l**********1
发帖数: 2980 | 23 Nevada’s largest newspaper blasted President Barack Obama in a blistering
editorial on Thursday about the Benghazi attacks in which four Americans
died, calling him an “unworthy commander-in-chief.”
Obama, who holds a small lead in Nevada, which has six electoral votes, was
taken to task by the Las Vegas Review-Journal for his handling of the
Benghazi, Libya attacks in an editorial headlined, “Benghazi blunder: Obama
unworthy commander-in-chief.”
“The Obama administration sat by doing nothing fo... 阅读全帖 |
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l****z
发帖数: 29846 | 24 (Reuters) - As the Syrian civil war got under way, a former electrician who
calls himself Sheikh Omar built up a brigade of rebel fighters. In two years
of struggle against President Bashar al-Assad, they came to number 2,000
men, he said, here in the northern city of Aleppo. Then, virtually overnight
, they collapsed.
Omar's group, Ghurabaa al-Sham, wasn't defeated by the government. It was
dismantled by a rival band of revolutionaries - hardline Islamists.
The Islamists moved against them at t... 阅读全帖 |
|
s********t
发帖数: 4150 | 25 The United States Embassy in Jakarta, Indonesia celebrated Independence Day
a month early -- to accommodate the country's Muslim population.
It seems the Fourth of July is right smack in the middle of Ramadan this
year so the embassy decided to move America’s birthday to the Fourth of
June.
“We are celebrating a month early to respect the holy month of Ramadan,”
Ambassador Robert Blake told a gathering at the embassy.
It sounds like every day is April Fool's Day at the U.S. Embassy in Jakarta.
... 阅读全帖 |
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m****s
发帖数: 494 | 26 What is most important for America and the next president? For me, the
answer is obvious — we have lacked leadership in both parties, and because
of this leadership deficit, the American people live in a nation less safe
and in a world that is more uncertain. Americans deserve real leadership in
the White House, and the choices Americans have in this presidential
campaign are clear.
What passes for leadership in Washington is really more about position,
seniority and the influences of special in... 阅读全帖 |
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|
发帖数: 1 | 28 So true. They've been dithering around Before, During and After.
Before attack, 600 emails to State Department for more security were totally
ignored.
During attack, the meeting of Obama and Clinton focused on not hurting the
feelings of the Libyans and a youtube video offending Muslims.
After attack, Clinton and Obama blamed it on the youtube video. "What
difference at this point does it make?" Clinton said. |
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d*********p
发帖数: 1531 | 29 shame on you!!!
Republicans were fleeing Donald J. Trump after a video of him demeaning
women was made public last Friday, but less than a week later some are
already starting to come back to the Republican presidential nominee.
Senator Deb Fischer, a Republican from Nebraska who said on Saturday that Mr
. Trump’s remarks were “disgusting” and that he should drop out of the
race, said on Tuesday that she still planned to vote for Mr. Trump.
“Like most Nebraskans, I am fully committed to defeatin... 阅读全帖 |
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S*******i
发帖数: 2018 | 30 川总，习总各说各的，哈哈
http://www.wsj.com/articles/chinas-xi-takes-on-role-as-guardian-of-globalization-1510310670
China’s Xi Takes On Role as Guardian of Globalization
DA NANG, Vietnam—China’s President Xi Jinping called for a more inclusive
global economy to gird for technological change, burnishing Beijing’s claim
to free-trade leadership in his first address to a major multilateral forum
since consolidating executive power at home last month.
Speaking at the Asia-Pacific Economic Cooperation’s CEO Sum... 阅读全帖 |
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k*****n
发帖数: 9823 | 31 ☆─────────────────────────────────────☆
lechery (GIS) 于 (Tue Mar 11 08:54:35 2003) 提到:
对，我前面说的不准确
1bit 64fs的信号，需要激进的noise shaping
从而用到了feedback，这样就导致了instability
sigma delta的阶数越高，这个问题也会越严重
而且1bit dither一直会overload（Lip的观点）
对，unsampler如果原理仅仅是unsample的话
那么不应该有什么好处，因为一般的信号转换，专业领域一直用着
从来没有被当作提高音质的手段
所以我研究了半天，觉得关键就是在那个小波分析上面
我看了一篇小波分析应用在音频压缩上面的论文
具体不怎么懂，不过里面说，用小波分析解压的时候，
有一个猜的过程，但是是一个good guess
dCs在他们的unsampler里面用了小波分析技术，这个是他们自己承认的
所以我推测，很可能是利用小波分析人为的加了味精
虽然这个味精非常真实，也有理论基础
☆───────────────────── |
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c*****n
发帖数: 949 | 32 貌似以前从44.1->48Hz sampling rate 转换的时候，问题主要处在digital truncate
，刚刚从foobar上看到有dither的选项，如果用foobar 放音乐的话可以试试，好像感
觉声音更柔顺了，也可能是心理作用。 |
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a****a
发帖数: 48 | 34 首先有个概念你得弄清：在录音棚里，稍微专业点的工程师都不可能以16bit/44.1khz
这样的“低”精度去“录制”音乐（这里只说digital recording，analog的是另一回
事）。后期digital master时也不可能是这个精度。只有在最后压制CD前才会最终转化
为16/44.1。录音室里的工程精度至少都是24/96以上。简而言之，AD转换，精度越高越
好；DA转换，16/44.1够用了。但是，自从CD诞生之日起一直到现在，关于16/44.1音质
不如模拟介质比如黑胶或者现在的hi-res介质比如DVDA/SACD的争论就一直没有停止过
。而且事实是，很多时候一张CD听上去确实不如相同内容的黑胶或者SACD，包括人声不
够自然，高频尖、硬，sound stage较小，低频含糊，等等。其实这个问题根本不在16/
44.1的CD精度上，而在于CD所使用的master常常有别于黑胶或其他。降噪、动态压缩、
限幅等等在CD上常常被滥用，而且在90年代中后期演变为愈演愈烈的loudness war，才
有了所谓“冷硬的数码声”和“温暖的模拟声”。CD格式精度本就没有问题，信噪... 阅读全帖 |
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l*****7
发帖数: 2844 | 36 看看这个
2013 Outlook: Lex Parsimoniae
There are known knowns; there are things that we know
There are known unknowns; that is to say there are things that we now know
we don't know"
But there are also unknown unknowns - there are things we do not know we don
't know"
-Donald Rumsfeld, U.S. Secretary of Defense, 2002
The economic and market environment remains as uncertain as ever as we move
into 2013. One does not have to look far to find extreme risks that could
propel us sharply in either directi... 阅读全帖 |
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M*****t
发帖数: 1842 | 37 .CROP.article568-large.gif
http://www.slate.com/blogs/future_tense/2013/07/15/elon_musk_hy
Forget High-Speed Rail: Elon Musk Wants to Build Something Far More Awesome
By Will Oremus
|
Posted Monday, July 15, 2013, at 5:54 PM
Share on Facebook
16
38
Elon Musk's Hyperloop
We don't know yet what Elon Musk's hypothetical Hyperloop might look like,
but he claims it would get passengers from Los Angeles to San Francisco in
under half an hour
Illustration by Fedor Selivanov / Shutterstock.com
High-spee... 阅读全帖 |
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f**********n
发帖数: 10757 | 38 The message comes from John McEnroe who hates Nadal's dithering slow-coach
antics.
Big Mac said: "What I would do against Nadal is make sure the umpire is
aware of all these time-delay rulings.
"Let's go with the rules because he seems to take his time often.
"Also try to get under his skin in some way - he has got a routine and say '
I'm not accepting to allow you to go through this'."
Juan Martin Del Potro was angry with Nadal being allowed almost 10 minutes
treatment during their fourth-round... 阅读全帖 |
|
wh
发帖数: 141625 | 39 哇哇哇！哪天哪天？我们版有很多处女座……
而且还要会骂人。我以前转贴过一篇劳伦斯骂人的文章：
狗血喷头
陆谷孙
April 30，2010
今天看到一段英国作家D.H.劳伦斯痛骂他的英国同胞的一段话，正应了我们中国人那句
成语“狗血喷头”，摘引并试译如下，供英四同学参考：
“Curse the blasted, jelly-boned swines, the slimy, the belly-wriggling
invertebrates, the miserable sodding rutters, the flaming sods, the
sniveling, dribbling, dithering, pulse-less lot that make up England today.
” (诅咒那帮构成今日英国天打五雷轰的家伙，一个个都是软骨猪猡，污秽龌龊，肚皮
贴地扭行的蠕虫，眼巴巴求偶交配的兽类，淫火烈烧的相公，抽抽搭搭，嘴角流涎，抖
抖索索，连脉搏也搭不出了。)
劳君为什么破口大骂同胞？原来是因为英国一家叫Heinemann的出版社曾拒出他的一本
书——还不是后来遭禁几... 阅读全帖 |
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b*s
发帖数: 82482 | 40 居然找到了：
这个Surowiecki老是写经济专栏的……
http://www.newyorker.com/arts/critics/books/2010/10/11/101011cr
Later
What does procrastination tell us about ourselves?
by James Surowiecki October 11, 2010
Procrastination interests philosophers because of its underlying
irrationality.
Some years ago, the economist George Akerlof found himself faced with a
simple task: mailing a box of clothes from India, where he was living, to
the United States. The clothes belonged to his friend and colleague Joseph
Stiglitz, w... 阅读全帖 |
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e***d
发帖数: 8248 | 41 Color Profile 是可以嵌在图像文件头里面的，
存图像文件的时候连带 Color Profile 一起存了，
CMYK 也好，RGB 也好，只要印刷设备或显示软件支持 color profile,
就能保证你看到的和别人看到的或印制出来的一致。
不过因为你是上传的 CMYK 格式，天晓得网站在转换的时候做了什么。
也可以在上传前存一个 24 位的 RGB PNG 的拷贝，
不选 dithering,
Adobe 的色彩转换更严肃认真一点，
而且，位数多，转换得更精准，色偏会小很多。 |
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l******a
发帖数: 10467 | 42 有没有看到右边大约25％的地方和下面25％的地方有一条亮线， ips的没有， 这个图
的色彩饱和度是线性的， ＴＮ是6bit color range, ips 是8bit的， ＴＮ是靠dither
出来的伪真彩色 |
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m**u
发帖数: 632 | 43 TN的看不清楚那两个亮线,IPS的倒是能看出来,难道是假的?
dither |
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n**b
发帖数: 13203 | 44 哈哈，这是说的这里的各位啊。。。
“but in reality, most people who buy these are dithering hobbyists who
spend more time on internet "forums" than actually taking pictures and only
wind up buying what they really want a few years later, when the real LEICA
lenses will cost even more than they do today.”
your
a |
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y*******n
发帖数: 10103 | 45 网站写的也是frame rate control 即 8bit dithering,伪 10bit.
其实8bit 10bit真的看不出啥区别。 |
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l*r
发帖数: 669 | 46 this one is a little difficult for me ... hehe |
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n******t
发帖数: 4406 | 47 Depends on the context. |
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f**********r
发帖数: 18251 | 49 【 以下文字转载自 Military 讨论区 】
发信人: ultraiso (goodman), 信区: Military
标 题: 美国众议院武装联席会主席谴责大陆高超音速导弹载具试射
发信站: BBS 未名空间站 (Tue Jan 14 13:28:37 2014, 美东)
http://armedservices.house.gov/index.cfm/press-releases?Content
Jan 13 2014
Committee Members React to Chinese Hyper Sonic Missile Test
McKeon, Forbes and Rogers weigh in
Washington, D.C. - House Armed Services Committee Chairman Howard P. "Buck"
McKeon, Rep. Randy Forbes (VA) and Rep. Mike Rogers (AL) issued the
following statement after learning of a Chi... 阅读全帖 |
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