噪音燥音噪音
我从Rane的技术文章翻到了多年前遗漏的资料,我快速的翻译一下,可能不太顺畅,有英文通的高手就请施展您的恩惠吧!因为这一篇很重要的
noise color 噪音；杂讯颜色
工作在专业声频方面的人员都知道所谓的白噪音和粉红色的噪音，但是鲜少数是认识到 "azure
noise＂( 碧蓝的噪音 ) 或者 "red noise＂ ( 红噪音 )，但是他们才是真正的名称。
噪音并不是白色的，而是称为有颜色的噪音。而且在这样的分布下，有一些频率会有多些的能量
超过别的频率，类似那光谱的层次，最亮的趋近于白亮光色彩。
白噪音会如此被命名，是因为它在整个全部听得见的频率范围里，包含均匀分配的是与白光相似
的。让白光通过一个棱镜 ( 一个过滤的元件 ) 依频率与光谱波长的特性，检查显示以红色光的
波长最长的特点，换言之即如同在声音低频率的位置。
粉红色的噪音在低频域里 ( 红光谱里 )，有比较高的能量胜出，这样的非正式的标准与依据一
直被发现，因此联邦标准1037 C电信：电信的词汇表里就去将其定义了四个噪音色彩，就是
( 白white，粉红 pink，蓝 blue，黑 black ) 这是考虑到官方的权威。
跟着下列的噪音色彩明细，以彩色的色系分布开来，对应到我们的声频上，光谱色彩之间将会有
渐层的交错，如同频率能量斜率数据的显示。红色噪音同样的也称为棕色噪音：-6 dB/oct的密度减少，(大多数的低频能量或是功率，应用在海洋学上 (1 / frequency－squared )。
粉红色噪音：-3 dB/oct递减噪音密度，(但是等能量在每一音程：1/频率噪音，或是摆动噪音：功率成比在1/频率 )。
白色噪音：0 dB/oct参考噪音与等功率密度，(等功率在每一赫芝)。
蓝色噪音或是碧蓝噪音：+3 dB/oct噪音增加密度，(功率比例到频率 )。
紫色或称为紫罗兰噪音：+6 dB/oct噪音增加密度，
黑色噪音：没声音的。
还有其他的噪音颜色存在于其他专门场合上，例如影像处理、通讯、精密数学等，
•
People working in pro audio know the terms white noise and pink noise, but few recognize the terms "azure noise" or "red noise," but they are real terms. Noise that is not white is called colored noise and will have more energy at some frequencies than others, analogous to colored light.
White noise and pink noise are well defined and known; much less so are the others.
White noise is so named because it is analogous to white light in that it contains all audible frequencies distributed uniformly throughout the spectrum. Passing white light through a prism (a form of filtering) breaks it down into a range of colors. Examination shows that red light is characterized by the longer wavelengths of light, i.e., the lower frequency region. Similarly, "pink noise" has higher energy in the low frequencies, hence the somewhat tongue-in-cheek term.
The Federal Standard 1037C Telecommunications: Glossary of Telecommunication Terms defines four noise colors (white, pink, blue & black) and is considered the official source. No official standard could be found for the others.
The following list of noise colors is loosely based on a rainbow-prism light analogy, where a prism creates a rainbow effect by separating white light passed through it into a visible spectrum labeled red, orange, yellow, green, blue, indigo, and violet from lowest to highest frequencies. Also shown is the approximate slope of the power density spectrum relative to white noise used as the reference:
• red noise also called brown noise: -6 dB/oct decreasing density (most amount of low frequency energy or power; used in oceanography; power proportional to 1/frequency-squared); popcorn noise.
• pink noise: -3 dB/oct decreasing noise density (but, equal power per octave; 1/f noise or flicker noise; power proportional to 1/frequency).
• white noise: 0 dB/oct reference noise with equal power density (equal power per hertz; Johnson noise).
• blue (or azure) noise: +3 dB/oct increasing noise density (power proportional to frequency).
• purple (or violet) noise: +6 dB/oct increasing noise density (power proportional to frequency-squared; most amount of high frequency energy or power).
black noise: silence (zero power density with a few random spikes allowed).
Other noise colors exist for specialized fields like video/photographic/image processing, communications, mathematical chaos theory, etc., but are not found in pro audio circles. Definitions for the noise colors orange, green, gray, and brown are found many times on the Web, but all appear to be from the same document (whose true origin I could not detect), e.g. see Bob Paddock at Circuit Cellar Online. Definitions without supporting documentation are suspect.
noise color 噪音；杂讯颜色
工作在专业声频方面的人员都知道所谓的白噪音和粉红色的噪音，但是鲜少数是认识到 "azure
noise＂( 碧蓝的噪音 ) 或者 "red noise＂ ( 红噪音 )，但是他们才是真正的名称。
噪音并不是白色的，而是称为有颜色的噪音。而且在这样的分布下，有一些频率会有多些的能量
超过别的频率，类似那光谱的层次，最亮的趋近于白亮光色彩。
白噪音会如此被命名，是因为它在整个全部听得见的频率范围里，包含均匀分配的是与白光相似
的。让白光通过一个棱镜 ( 一个过滤的元件 ) 依频率与光谱波长的特性，检查显示以红色光的
波长最长的特点，换言之即如同在声音低频率的位置。
粉红色的噪音在低频域里 ( 红光谱里 )，有比较高的能量胜出，这样的非正式的标准与依据一
直被发现，因此联邦标准1037 C电信：电信的词汇表里就去将其定义了四个噪音色彩，就是
( 白white，粉红 pink，蓝 blue，黑 black ) 这是考虑到官方的权威。
跟着下列的噪音色彩明细，以彩色的色系分布开来，对应到我们的声频上，光谱色彩之间将会有
渐层的交错，如同频率能量斜率数据的显示。红色噪音同样的也称为棕色噪音：-6 dB/oct的密度减少，(大多数的低频能量或是功率，应用在海洋学上 (1 / frequency－squared )。
粉红色噪音：-3 dB/oct递减噪音密度，(但是等能量在每一音程：1/频率噪音，或是摆动噪音：功率成比在1/频率 )。
白色噪音：0 dB/oct参考噪音与等功率密度，(等功率在每一赫芝)。
蓝色噪音或是碧蓝噪音：+3 dB/oct噪音增加密度，(功率比例到频率 )。
紫色或称为紫罗兰噪音：+6 dB/oct噪音增加密度，
黑色噪音：没声音的。
还有其他的噪音颜色存在于其他专门场合上，例如影像处理、通讯、精密数学等，
•
People working in pro audio know the terms white noise and pink noise, but few recognize the terms "azure noise" or "red noise," but they are real terms. Noise that is not white is called colored noise and will have more energy at some frequencies than others, analogous to colored light.
White noise and pink noise are well defined and known; much less so are the others.
White noise is so named because it is analogous to white light in that it contains all audible frequencies distributed uniformly throughout the spectrum. Passing white light through a prism (a form of filtering) breaks it down into a range of colors. Examination shows that red light is characterized by the longer wavelengths of light, i.e., the lower frequency region. Similarly, "pink noise" has higher energy in the low frequencies, hence the somewhat tongue-in-cheek term.
The Federal Standard 1037C Telecommunications: Glossary of Telecommunication Terms defines four noise colors (white, pink, blue & black) and is considered the official source. No official standard could be found for the others.
The following list of noise colors is loosely based on a rainbow-prism light analogy, where a prism creates a rainbow effect by separating white light passed through it into a visible spectrum labeled red, orange, yellow, green, blue, indigo, and violet from lowest to highest frequencies. Also shown is the approximate slope of the power density spectrum relative to white noise used as the reference:
• red noise also called brown noise: -6 dB/oct decreasing density (most amount of low frequency energy or power; used in oceanography; power proportional to 1/frequency-squared); popcorn noise.
• pink noise: -3 dB/oct decreasing noise density (but, equal power per octave; 1/f noise or flicker noise; power proportional to 1/frequency).
• white noise: 0 dB/oct reference noise with equal power density (equal power per hertz; Johnson noise).
• blue (or azure) noise: +3 dB/oct increasing noise density (power proportional to frequency).
• purple (or violet) noise: +6 dB/oct increasing noise density (power proportional to frequency-squared; most amount of high frequency energy or power).
black noise: silence (zero power density with a few random spikes allowed).
Other noise colors exist for specialized fields like video/photographic/image processing, communications, mathematical chaos theory, etc., but are not found in pro audio circles. Definitions for the noise colors orange, green, gray, and brown are found many times on the Web, but all appear to be from the same document (whose true origin I could not detect), e.g. see Bob Paddock at Circuit Cellar Online. Definitions without supporting documentation are suspect.