UID1459769
威望3
金钱843
交易诚信度0
主题12
帖子448
注册时间2019-3-16
最后登录2019-10-1
初级会员
 
交易诚信度0
注册时间2019-3-16
|
本帖最后由 guhuizhe 于 2019-5-12 23:29 编辑
怎么说呢...本来只是个好好的晒磁带的帖子,到最后竟然争论不休起它到底是不是真的二类来了
小弟方才在逛国外论坛Tapeheads时,发现有国外老烧(原话:highly respected authorities,受到尊敬的权威)对这种带子做出了解释,原文如下:
-
Some clarifications for high-speed duplicated chrome cassettes:
1) The bias point is for chrome.
2) The pre-emphasis (record EQ) is very close to that for Type I, which means that it is reduced about 4.5 dB to give 4.5 dB more SOL--close to metal tapes as Alex points out. (This can also be done on recorders with separate bias and EQ switches such as the Nakamichi decks Alex mentions.)
3) The playback EQ is 120-microseconds. This means 4.5 dB more noise than playback at 70-microseconds; but with the ultra low noise chrome tape and Dolby B noise reduction, noise is barely noticeable.
4) BASF thought of this first, but we decided to settle on 70-microsecond EQ playback before anyone knew Dolby B NR would be so popular. Once Dolby was common, we had the opportunity to "fix" things when A&M decided to use chrome for their music cassettes. The BASF application engineers provided charts and specs but got nowhere. Terry O'Kelly simplified the technical explanation for A&M management and pointed out that they could "save" money by using the normal housing if they went with 120-microsecond EQ. That won them over.
5) A&M's first chrome cassette was Supertramp's "Famous Last Words" at 70-us EQ. The next was the Police's "Sychronicity" at 120-us EQ, such a huge hit that other artists began to demand the use of chrome tape for their releases.
6) Chromium dioxide tape remained the only choice for premium high-speed duplication. (TDK attempted to introduce bulk SA into the market and actually got into WEA--Warner/Electra/Atlantic--for some of their Digalog releases when they got Concept Designs digital bins. TDK didn't last long because the pancakes had poor winds and ruboff, and--like TDK consumer cassettes--the output values varied because the factories were always tinkering with the formulation. TDK was in and out of the market within 4 months. Metal tape was never considered because the current required for the high-speed duplicator heads would create too much heat and distortion and because metal tape has the highest noise level.) In the early 1990's BASF introduced a chrome formulation that included 15% ferric-cobalt oxide, which O'Kelly named "Chrome Plus." The addition of the ferric-cobalt reduced distortion and allowed another 1.5 dB of MOL with no sacrifice in noise. We added this tape because both Aurex and SKC were manufacturing chrome bulk tape using DuPont oxide, and we had to be sure our chrome tape significantly outperformed their tape. At the end of BASF's tape business in 1996, BASF had nearly 90% of the chrome duplication business; and Aurex and SKC divided the other 10%.
-
小弟英文不佳(现在才读高一...而且因为休学英语忘得差不多了 ),在此贴上谷歌机翻的结果(当然我个人对于一些看不下去的错误适当改动了一下,如有错误见谅):
对高速复制铬带的一些澄清:
1)偏磁点是铬。
2)预加重(记录均衡器)非常接近于Type I,这意味着它减少了大约4.5分贝,给出了4.5分以上的SOL - 接近金属带,正如亚历克斯指出的那样。(这也可以在具有单独偏磁和EQ开关的卡座上完成,例如Nakamichi卡座)
3)播放EQ为120微秒。这意味着比70微秒的播放噪声多4.5 dB; 但凭借超低噪音铬带和杜比B降噪,噪音几乎不可见。
4)巴斯夫首先想到这一点,但我们在任何人都知道杜比B NR如此受欢迎之前已经确定了70微秒的均衡回放(应该指二类在B NR出现前已经是70uS Playback EQ了)。一旦杜比很常见,我们就有机会在A&M决定将Chrome用作音乐磁带时“修理”东西(不知道啥意思了)。巴斯夫应用工程师提供了图表和规格但却无处可去。Terry O'Kelly简化了A&M管理层的技术解释,并指出如果他们使用120微秒EQ,他们可以通过使用普通盒式磁带的外壳来“节省”资金。这让他们赢了。
5)A&M的第一个镀铬盒式磁带是Supertramp在70-us EQ上的“着名的最后一句话”。接下来是The Police在120-us EQ上的“Sychronicity”,这是一个巨大的打击,其他艺术家开始要求使用铬带进行发布。(这个应该是在讲某唱片公司发行这类带子的历史)
6)二氧化铬磁带仍然是优质高速复制的唯一选择。(TDK试图将大量SA引入市场并实际进入WEA - Warner / Electra / Atlantic - 当他们获得Concept Designs数字母带时,他们的一些Digalog版本.TDK没有持续多久,因为带粉(原文:pancake,有粉扑意)容易被擦掉(可能是掉粉的意思吧)。和TDK消费类磁带一样,产品价值各不相同,因为工厂总是在修改配方.TDK在4个月内进出市场。从未考虑过金属磁带,因为当前所需的金属磁带高速复制机磁头会产生过多的热量和失真,因为金属带的噪音水平最高。)1990年代早期,巴斯夫推出了一种含有15%铁 - 钴氧化物的铬配方,O'Kelly将其命名为“Chrome Plus”。添加三价钴会降低失真,并允许另外1.5 dB的MOL,不会牺牲噪音。我们添加了这种磁带,因为Aurex和SKC都使用DuPont(杜邦)氧化物生产镀铬散装磁带,我们必须确保我们的铬磁带明显优于他们的磁带。在巴斯夫1996年的磁带业务结束时,巴斯夫拥有近90%的铬复制业务; 而Aurex和SKC将其他10%分开。
注:Supertramp,英国摇滚乐队(The Police同)
A&M,英国唱片发行商
-
只是转载一下国外网友对这类带子的看法,原文:Chrome cassette without auto-detect holes(没有识别孔的铬带),对任何人均无冒犯意思。
还是希望坛友们都能和和气气的把事情慢慢理清楚,现在感觉就是争论不休的节奏了...
|
|