选择滤波器的坡度值:12,18 还是 24 dB/八度?
在低通滤波器或者高通滤波器中常常配备有一个坡度选项,如下图。
那么滤波器的坡度值意味着什么呢?我们又该如何选择适合的坡度值呢?
我们知道,一个低通滤波器的电路原理是让声音信号的低频部分通过,并切掉高频部分。可是信号频率的切除与通过之间又是如何过渡的呢?绝大多数的滤波器并不是在某一频率点将声音拦腰截断。那种「一刀切」或者说「砖墙」似的滤波器效果并不实用,听起来也并不好听。
事实上,滤波器中存在一个「完全通过频段」,在这一频段上声音信号完全通过而不受滤波器的影响,然后信号逐渐减弱 3 dB 后到达滤波器设定的截止频率(Cutoff Frequency),接着信号继续逐渐减弱到 0 dB。接下来的问题是,上述信号减弱到 0 dB 的过程中,信号的频率相对于截止频率改变了多少呢?
以低通滤波器为例,如果用一个电阻和一个电容来构成一个最简单的低通滤波器模型,那么频率每升高一个八度(频率值加倍),该频率的信号强度相应减少 6 dB。即信号强度相较于频率的改变速率为 6 dB 每八度。
如果滤波器的设计更复杂一些,信号减弱的速率可以达到 12 dB/八度、18 dB/八度甚至 24 dB/八度。在电路设计中,6、12、18以及 24 之外的中间值是很难设计出来的。
问题是,这些不同的信号减弱速率即「坡度」有什么实际用处呢?
坡度值为 6 dB/八度的滤波器滤波效果更加柔和,产生的声音不那么明亮尖锐,而12 dB/八度的坡度值产生的声音更加棱角分明。24 dB/八度的坡度值在大多数情况下都有些「切太狠」,但是在合成器的滤波器单元中,24 dB/八度对因对声音塑形有着很显著的效果而常常使用。
扬声器的低中高单元间的交叉同样要用到滤波器原理和其坡度值。12 dB/八度 和 18 dB/八度的坡度值广泛应用于划分扬声器低频单元、中频单元和高频单元。而陡峭的 24 dB/八度的坡度往往只应用于 PA 系统(公共扩声系统)中。
Hmm is anyone else encountering problems with the images on this blog loading?
I’m trying to figure out if its a problem on my end or if it’s the blog.
Any feed-back would be greatly appreciated.
Superb post however I was wanting to know if you could write a
litte more on this topic? I’d be very grateful if you could elaborate
a little bit more. Cheers!
Este Texto me convenceu de uma coisa, eu absolutamente acredito que este site precisa de
muita atenção por parte das pessoas, porque é realmente muito
interessante. Eu provavelmente vou voltar a
ler. Os textos são muito bem escritos. Obrigado
pela informação e Parabéns.
I savour, cause I discovered exactly what I used to be looking for.
You’ve ended my four day lengthy hunt! God Bless you man. Have a great day.
Bye
Excelente a forma como escreve! Comecei a
visitar o seu conteúdo há pouco tempo e estou impressionado com a qualidade .
Continue assim!
hey there and thank you for your info – I’ve certainly picked
up anything new from right here. I did however expertise some technical issues using this web
site, since I experienced to reload the web site lots of times previous to I could
get it to load properly. I had been wondering if your hosting is OK?
Not that I’m complaining, but sluggish loading instances times will very frequently
affect your placement in google and could damage your high quality score if advertising and
marketing with Adwords. Anyway I’m adding this RSS to my email and can look
out for a lot more of your respective exciting content. Ensure that
you update this again soon.
Genuinely no matter if someone doesn’t be aware of then its up to other people that they will help,
so here it occurs.
This design is wicked! You most certainly know how to keep a reader entertained.
Between your wit and your videos, I was almost moved to start my own blog (well, almost…HaHa!)
Fantastic job. I really enjoyed what you had to say,
and more than that, how you presented it. Too cool!
Oh my goodness! Awesome article dude! Thanks, However I am encountering issues with your RSS.
I don’t know why I am unable to join it. Is there anybody having similar RSS
issues? Anyone that knows the answer will
you kindly respond? Thanks!!
Highly energetic article, I liked that a lot. Will there
be a part 2?
You really make it seem really easy with your presentation however I find this matter
to be actually one thing that I believe I might
by no means understand. It seems too complicated and very extensive for
me. I am taking a look forward in your subsequent post, I’ll attempt to get
the hold of it!
You could certainly see your expertise in the article you write.
The arena hopes for more passionate writers such as you who aren’t afraid
to say how they believe. Always follow your heart.
Hey just wanted to give you a quick heads up. The words in your content seem to be running off the screen in Opera.
I’m not sure if this is a format issue or something to do with internet browser compatibility but I
thought I’d post to let you know. The style and design look great though!
Hope you get the issue fixed soon. Cheers
Currently it seems like WordPress is the top blogging platform
out there right now. (from what I’ve read) Is that what you are using
on your blog?
Someone necessarily lend a hand to make critically posts I might state.
This is the first time I frequented your web page and to this point?
I amazed with the research you made to create this particular publish amazing.
Wonderful activity!
This is the right website for everyone who would like to understand this topic.
You realize a whole lot its almost hard to argue with you (not that I personally
will need to…HaHa). You certainly put a brand new spin on a subject which has been written about for decades.
Wonderful stuff, just wonderful!
Very shortly this website will be famous amid all blogging viewers, due to
it’s fastidious articles
Excellent post. I used to be checking continuously this blog and I am inspired!
Extremely useful information specially the remaining part 🙂 I maintain such info much.
I was seeking this particular information for a very lengthy time.
Thanks and best of luck.
When I initially commented I clicked the “Notify me when new comments are added” checkbox and
now each time a comment is added I get four emails with
the same comment. Is there any way you can remove people from that service?
Thanks a lot!
I believe everything typed made a bunch of sense.
But, what about this? suppose you added a little content?
I ain’t suggesting your content isn’t solid, however what if you added a headline to maybe get folk’s attention? I mean 选择滤波器的坡度值:12,18 还是 24 dB/八度? | Soundmono is a little plain. You
should peek at Yahoo’s home page and watch how they create post headlines to grab viewers to
open the links. You might add a related video or a pic or two to
grab people excited about everything’ve written. Just my opinion, it
would bring your posts a little bit more interesting.
Truly no matter if someone doesn’t understand afterward its up to other viewers that
they will assist, so here it occurs.
Greetings from Colorado! I’m bored to tears at work so I decided to check out your
website on my iphone during lunch break. I enjoy the information you provide here and can’t wait to take a look when I get home.
I’m shocked at how fast your blog loaded on my cell phone ..
I’m not even using WIFI, just 3G .. Anyways, good blog!
Hello, after reading this amazing piece of writing i am also delighted to share
my familiarity here with friends.
I appreciate, lead to I discovered exactly what I was having a
look for. You’ve ended my 4 day lengthy hunt! God Bless you man. Have a
great day. Bye
whoah this weblog is magnificent i love reading your articles.
Keep up the great work! You realize, a lot of people are hunting round for this info, you could help them greatly.
Every weekend i used to pay a visit this web site, as
i want enjoyment, for the reason that this this website conations really good funny data too.
Hello There. I found your weblog the usage of msn. This is an extremely well written article.
I will make sure to bookmark it and return to read extra of your helpful information. Thanks for the post.
I will definitely return.
Asking questions are really pleasant thing if you
are not understanding anything fully, except this article gives nice understanding yet.
I am sure this piece of writing has touched all the internet
viewers, its really really pleasant piece of writing
on building up new web site.
Do you mind if I quote a few of your articles as long as I provide credit and sources back to your site?
My blog is in the very same area of interest as yours and my visitors would certainly
benefit from some of the information you present here.
Please let me know if this ok with you. Thanks!
This is very interesting, You’re a very skilled blogger.
I have joined your rss feed and look forward to seeking more of your great post.
Also, I’ve shared your site in my social
networks!
Hello, yeah this paragraph is genuinely good and I have learned lot of things from it
regarding blogging. thanks.
For most recent news you have to go to see the web and on web I found this web page as a finest site for newest updates.
Someone essentially assist to make severely
articles I would state. That is the first time I frequented your web page and to this
point? I amazed with the analysis you made to create this particular post extraordinary.
Wonderful process!
Thanks for the blog post.Much thanks again. Really Great.
Thank you ever so for you post. Fantastic.
Im thankful for the blog post.Much thanks again. Keep writing.
Say, you got a nice article.Really looking forward to read more. Want more.
I really like your blog.. very nice colors & theme. Did you create this website yourself or did you hire someone
to do it for you? Plz reply as I’m looking to design my own blog and would like to find out where u
got this from. appreciate it
I am genuinely thankful to the owner of this website who has shared this impressive paragraph at at this time.
Really enjoyed this blog.Really thank you! Fantastic.
A round of applause for your post. Really Cool.
I value the post. Keep writing.
I cannot thank you enough for the post.Much thanks again. Much obliged.
Hi there! Someone in my Facebook group shared this
website with us so I came to look it over. I’m definitely enjoying the information. I’m bookmarking and will be tweeting this
to my followers! Excellent blog and outstanding style and design.
Hi to every one, it’s actually a nice for me to go to see this website, it consists of helpful Information.
Great, thanks for sharing this article post. Want more.
WOW just what I was searching for. Came here by searching for your info
I really enjoy the blog article.Thanks Again. Fantastic.
Thanks for sharing, this is a fantastic post.Thanks Again. Keep writing.
A big thank you for your blog article. Really Cool.
Thank you ever so for you article post.Thanks Again. Really Great.
Thanks a bunch for sharing this with all people you actually realize what you’re talking about!
Bookmarked. Kindly also consult with my web site =).
We can have a hyperlink change agreement between us
I value the blog.Much thanks again. Really Great.
When some one searches for his vital thing, thus he/she desires to be available that in detail, therefore that thing is maintained over here.
I am so grateful for your post.Really thank you! Cool.
We’re a group of volunteers and starting a new scheme in our community.
Your site provided us with useful info to work on. You’ve performed a formidable task and our entire neighborhood shall be thankful to you.
Thanks so much for the article.Thanks Again. Keep writing.
Really enjoyed this article post.Really thank you! Fantastic.
Im obliged for the article.Thanks Again.
Awesome blog post.Really looking forward to read more. Great.
hello there and thank you for your information – I’ve certainly picked up anything new from right here.
I did however expertise a few technical points using this web site, since I
experienced to reload the website many times previous to I could get it to
load correctly. I had been wondering if your web host is OK?
Not that I am complaining, but sluggish loading instances times will often affect
your placement in google and can damage your high-quality score if ads and marketing with Adwords.
Well I am adding this RSS to my e-mail and could look out for much more of your respective
intriguing content. Ensure that you update this again soon.
I am so grateful for your blog article.Thanks Again. Really Great.
Major thanks for the article.Much thanks again. Awesome.
I truly appreciate this article post.Really thank you! Will read on…
Thank you ever so for you blog article.
I think this is a real great blog post. Fantastic.
I truly appreciate this blog post.Thanks Again. Awesome.
This is one awesome article post.Thanks Again. Fantastic.
Really enjoyed this article post.Much thanks again. Will read on…
I really like and appreciate your blog post.Really thank you! Cool.
Hey, thanks for the post.
Thanks again for the post. Awesome.
Major thankies for the blog post.Thanks Again. Want more.
Really appreciate you sharing this blog.Much thanks again. Will read on…
Thanks for the article post. Keep writing.
Really informative article.Really looking forward to read more. Much obliged.
Thanks again for the blog.Really thank you! Really Cool.
Muchos Gracias for your article.Much thanks again. Cool.
Major thanks for the blog. Really Cool.
Great post.Really thank you! Awesome.
Looking forward to reading more. Great blog.Much thanks again. Much obliged.
I truly appreciate this blog post.Really thank you! Awesome.
I truly appreciate this blog post.Really thank you! Awesome.
I value the article post. Really Great.
I think this is a real great article. Awesome.
Hey, thanks for the article post.Much thanks again.
Really enjoyed this blog article.Thanks Again. Much obliged.
Major thankies for the blog article.Much thanks again. Fantastic.
A big thank you for your blog.Thanks Again. Really Cool.
I loved your blog.Much thanks again. Want more.
Wow, great blog.Much thanks again.
Enjoyed every bit of your post.Really looking forward to read more. Will read on…
Looking forward to reading more. Great article.Thanks Again. Want more.
I really enjoy the article.Really thank you! Really Cool.
Thanks for sharing, this is a fantastic blog post.Much thanks again.
Muchos Gracias for your blog post.Thanks Again. Awesome.
Major thanks for the blog article.Really thank you! Keep writing.
I really like and appreciate your blog article. Great.
A big thank you for your blog post. Really Cool.
This is one awesome blog post.Really thank you! Great.
I really enjoy the blog post. Want more.
Great blog post. Want more.
Very neat blog.Thanks Again. Really Great.
Thanks so much for the post.Thanks Again. Really Cool.
Thanks for the article. Really thank you! Really Great.
I truly appreciate this article. Much obliged.
wow, awesome blog.Really thank you! Much obliged.
Thanks a lot for the blog.Thanks Again. Really Great.
I really liked your blog post.Thanks Again. Great.
Im obliged for the blog.Much thanks again. Awesome.
Say, you got a nice post.Thanks Again. Great.
Hey, thanks for the post. Really thank you! Want more.
I really like and appreciate your blog.
Great, thanks for sharing this article.Really looking forward to read more.
Looking forward to reading more. Great blog article. Really Great.
Hey there, You’ve done an excellent job. I will definitely digg it and
personally suggest to my friends. I am sure they will be benefited from this web site.
Really enjoyed this blog.Thanks Again.
Sweet blog! I found it while browsing on Yahoo News.
Do you have any tips on how to get listed in Yahoo News?
I’ve been trying for a while but I never seem to get there!
Thank you
Awesome blog post.Really looking forward to read more.
Really enjoyed this blog article.Much thanks again. Will read on…
Muchos Gracias for your blog post.Really thank you! Really Cool.
Muchos Gracias for your blog article.Thanks Again. Want more.
Im thankful for the article post.Really looking forward to read more. Keep writing.
Next time I read a blog, I hope that it does not disappoint me just as much as this particular one. After all, I know it was my choice to read through, nonetheless I genuinely thought you’d have something helpful to say. All I hear is a bunch of crying about something you can fix if you were not too busy searching for attention.
This is the perfect website for everyone who hopes to understand this topic. You understand so much its almost hard to argue with you (not that I really would want to…HaHa). You certainly put a fresh spin on a topic which has been written about for years. Great stuff, just great.
Greetings! Very helpful advice in this particular article! It’s the little changes that produce the most important changes. Thanks a lot for sharing!
I’d like to thank you for the efforts you have put in writing this blog. I really hope to view the same high-grade blog posts from you later on as well. In fact, your creative writing abilities has inspired me to get my own website now 😉
This is a topic that’s near to my heart… Thank you! Where are your contact details though?
I could not refrain from commenting. Very well written!
I absolutely love your website.. Very nice colors & theme. Did you build this site yourself? Please reply back as I’m wanting to create my very own blog and want to know where you got this from or just what the theme is named. Cheers.
This site certainly has all of the info I needed about this subject and didn’t know who to ask.
After I originally commented I seem to have clicked the -Notify me when new comments are added- checkbox and from now on each time a comment is added I receive 4 emails with the exact same comment. Is there a way you can remove me from that service? Kudos.
There is certainly a great deal to learn about this topic. I love all of the points you made.
Good day! I just want to give you a big thumbs up for your excellent info you have here on this post. I am coming back to your site for more soon.
Really enjoyed this post.Really thank you! Keep writing. makaberzux
Really enjoyed this post.Really thank you! Keep writing. makaberzux
Next time I read a blog, Hopefully it doesn’t disappoint me as much as this one. After all, Yes, it was my choice to read through, but I actually thought you’d have something interesting to talk about. All I hear is a bunch of moaning about something you can fix if you weren’t too busy searching for attention.
This is a topic that is near to my heart… Cheers! Exactly where can I find the contact details for questions?
Really enjoyed this post.Really thank you! Keep writing. makaberzux
Really enjoyed this post.Really thank you! Keep writing. makaberzux
I am extremely impressed with your writing skills as well as with the layout on your weblog. Is this a paid theme or did you modify it yourself? Anyway keep up the nice quality writing, it’s rare to see a great blog like this one nowadays.
Great post. I will be going through many of these issues as well..
Hi there! I could have sworn I’ve been to this site before but after going through many of the posts I realized it’s new to me. Nonetheless, I’m definitely delighted I discovered it and I’ll be bookmarking it and checking back regularly.
A fascinating discussion is definitely worth comment. I believe that you ought to write more on this subject matter, it may not be a taboo subject but usually people do not speak about such subjects. To the next! All the best!
Really enjoyed this post.Really thank you! Keep writing. makaberzux
Very nice article. I certainly appreciate this site. Stick with it!
Aw, this was an exceptionally good post. Finding the time and actual effort to create a good article… but what can I say… I hesitate a lot and never seem to get anything done.
I love reading an article that can make men and women think. Also, many thanks for allowing me to comment.
Everything is very open with a precise description of the issues. It was definitely informative. Your site is very useful. Thank you for sharing.
Really enjoyed this post.Really thank you! Keep writing. makaberzux
Hello! I could have sworn I’ve visited this blog before but after going through many of the articles I realized it’s new to me. Anyhow, I’m certainly pleased I stumbled upon it and I’ll be bookmarking it and checking back frequently.
Oh my goodness! Amazing article dude! Thank you so much, However I am experiencing issues with your RSS. I don’t know the reason why I am unable to join it. Is there anybody having similar RSS problems? Anybody who knows the solution will you kindly respond? Thanx!!
I quite like reading through a post that will make men and women think. Also, thank you for allowing for me to comment.
I was pretty pleased to uncover this page. I want to to thank you for your time just for this wonderful read!! I definitely liked every little bit of it and I have you bookmarked to see new things in your web site.
Good post. I learn something new and challenging on blogs I stumbleupon every day. It’s always exciting to read content from other writers and use a little something from their websites.
There is definately a great deal to find out about this topic. I really like all of the points you made.
This excellent website definitely has all the information and facts I wanted about this subject and didn’t know who to ask.
An impressive share! I have just forwarded this onto a coworker who has been doing a little research on this. And he in fact ordered me lunch due to the fact that I discovered it for him… lol. So allow me to reword this…. Thanks for the meal!! But yeah, thanks for spending the time to talk about this matter here on your internet site.
This is a topic which is close to my heart… Cheers! Where can I find the contact details for questions?
Hi! I could have sworn I’ve been to this site before but after browsing through many of the posts I realized it’s new to me. Anyways, I’m definitely happy I found it and I’ll be book-marking it and checking back regularly.
Hello there! This blog post could not be written any better! Looking through this post reminds me of my previous roommate! He always kept preaching about this. I am going to forward this information to him. Fairly certain he’ll have a very good read. Thank you for sharing!
Greetings! Very useful advice in this particular post! It is the little changes that produce the most important changes. Thanks a lot for sharing!
Everything is very open with a very clear explanation of the challenges. It was definitely informative. Your website is very useful. Thanks for sharing!
Quality content is the crucial to be a focus for the people to go to see
the site, that’s what this web page is providing.
Having read this I believed it was extremely enlightening. I appreciate you taking the time and energy to put this information together. I once again find myself spending way too much time both reading and posting comments. But so what, it was still worthwhile.
An outstanding share! I’ve just forwarded this onto a co-worker who had been conducting a little homework on this. And he in fact ordered me lunch because I discovered it for him… lol. So let me reword this…. Thanks for the meal!! But yeah, thanx for spending some time to discuss this subject here on your web page.
It’s perfect time to make some plans for the future and
it is time to be happy. I’ve read this post and if I could I wish to suggest you some interesting things
or advice. Perhaps you can write next articles referring to
this article. I wish to read more things about it!
This blog was… how do you say it? Relevant!! Finally I’ve found something which helped me. Kudos.
I feel that is among the most vital information for me.
And i am satisfied reading your article. However want to remark
on some normal issues, The site style is ideal, the articles is in reality nice :
D. Excellent task, cheers
I love reading through a post that can make men and women think. Also, thank you for allowing me to comment.
Everything is very open with a very clear explanation of the issues. It was definitely informative. Your website is very helpful. Many thanks for sharing.
After checking out a few of the blog articles on your site, I really appreciate your way of writing a blog. I bookmarked it to my bookmark website list and will be checking back soon. Please check out my web site as well and let me know how you feel.
You ought to take part in a contest for one of the most useful sites on the internet. I am going to recommend this web site!
May I simply say what a comfort to discover somebody that really knows what they’re talking about on the internet. You certainly realize how to bring a problem to light and make it important. More people should read this and understand this side of the story. I was surprised that you aren’t more popular because you most certainly possess the gift.
Hello there! This post couldn’t be written any better! Looking through this post reminds me of my previous roommate! He constantly kept talking about this. I am going to send this post to him. Fairly certain he’s going to have a great read. Thank you for sharing!
Right here is the perfect webpage for anyone who wishes to understand this topic. You realize so much its almost hard to argue with you (not that I actually would want to…HaHa). You certainly put a fresh spin on a topic which has been discussed for decades. Wonderful stuff, just wonderful.
When I originally left a comment I seem to have clicked on the -Notify me when new comments are added- checkbox and from now on each time a comment is added I receive 4 emails with the same comment. There has to be a means you can remove me from that service? Thanks a lot.
Really enjoyed this post.Really thank you! Keep writing. makaberzux