Звук, получаемый в результате наложения спектра, не музыкальный и весьма странный. Чтобы избежать этого нежелательного эффекта, частота выборки должна быть достаточной для регистрации всех имеющих значение обертонов. Перед устройством дискретизации желательно также установить фильтр, который бы ограничил ширину полосы и исключил нежелательные составляющие. Такая фильтрация дол жна выполняться в аналоговой области, до выполнения дискретизации.

И наконец, фильтрация необходима и после восстановления сигнала, поскольку из-за дискретности процесса выборки выходной сигнал имеет не плавную, а ступенчатую форму. Присутствующие в нем крутые фронты соответствуют высокочастотным составляющим, которых не было в исходном сигнале. Искажения второго типа связаны с ошибкой квантования. Они возникают в случае, если длина слова данных недостаточна для описания амплитуды с необходимой степенью детализации. Когда амплитудное значение сигнала находится между двумя соседними квантами, устройству дискретизации приходится выбирать один из них и тем самым вносить ошибку.

Если рассматривать достаточно длительный временной интервал, то появление таких ошибок носит случайный характер. Получаемый вследствие этого звук похож на шум, за тем лишь исключением, что возникает он только при наличии сигнала. Воспроизведение сопровождается жужжанием, и кажется, что оно связано с сигналом. Для решения проблемы во входной сигнал вводится аналоговый шум определенной амплитуды, и на его фоне шум, связанный с ошибкой квантования, маскируется. В результате этой операции шум возникает по случайному закону, и уровень слышимых искажений значительно уменьшается.

Как только в некоторый момент амплитуда сигнала представляется числом, это числовое значение необходимо запомнить. Поскольку данные обрабатываются цифровым компьютером, из чисел формируется двоичное слово. Наиболее часто используется формат представления, называемый линейной импульсно-кодовой модуляцией, который был разработан в 1939 г. сотрудником фирмы Bell Laboratories А. Ривсом.



  1. I just want to mention I am very new to blogs and honestly savored your web site. Likely I’m want to bookmark your blog . You certainly come with incredible articles. Kudos for sharing with us your website.

  2. obviously like your web-site but you need to check the spelling on quite a few of your posts. A number of them are rife with spelling issues and I to find it very bothersome to inform the truth on the other hand I’ll definitely come back again.

  3. Iˇm not positive where you are getting your info, but good topic. I needs to spend a while studying more or understanding more. Thanks for wonderful info I was on the lookout for this info for my mission.

  4. Magnificent website. Plenty of useful information here. I’m sending it to several friends ans additionally sharing in delicious. And obviously, thanks to your effort!

  5. I will right away seize your rss feed as I can’t to find your email subscription hyperlink or newsletter service. Do you’ve any? Kindly permit me recognize in order that I may subscribe. Thanks.

  6. Just wish to say your article is as astounding. The clearness in your post is just nice and i can assume you’re an expert on this subject. Fine with your permission let me to grab your feed to keep updated with forthcoming post. Thanks a million and please continue the enjoyable work.

  7. You can certainly see your enthusiasm in the work you write. The world hopes for even more passionate writers like you who are not afraid to mention how they believe. Always follow your heart. «The point of quotations is that one can use another’s words to be insulting.» by Amanda Cross.

  8. Good site! I truly love how it is simple on my eyes and the data are well written. I am wondering how I could be notified whenever a new post has been made. I’ve subscribed to your RSS which must do the trick! Have a great day!

  9. Enjoyed examining this, very good stuff, thanks . «All of our dreams can come true — if we have the courage to pursue them.» by Walt Disney.

  10. Hello very cool site!! Man .. Beautiful .. Wonderful .. I will bookmark your blog and take the feeds also…I am happy to search out numerous helpful info right here in the put up, we need develop extra techniques on this regard, thanks for sharing.

  11. Simply want to say your article is as astonishing. The clearness in your post is simply excellent and i can assume you are an expert on this subject. Fine with your permission let me to grab your feed to keep updated with forthcoming post. Thanks a million and please carry on the rewarding work.

  12. Its excellent as your other blog posts : D, regards for putting up. «Even Albert Einstein reportedly needed help on his 1040 form.» by Ronald Reagan.

  13. Internet should be an amalgamation and combined multifarious actions and features. It provides loads of opportunities to large a part of people, which makes a living easy to a great depth. Everything on internet seems so systematic and sophisticated, which to talk about funny mere question the functioning of the online world that will happen. Students search for their courses, businessmen look for their clients, and chatters look for some new friends. Provide you . how all things are on stage.»Bachelorette» alum Jesse Csincsak is teaming with Fring for a live Q&A session with fans Thursday, September. 29. Jesse become talking about his life since «Bachelorette» season 4, for which he was the winner, as well as what he recently been doing the show – «Bachelor Pad Beatdown,» «Bachelorette Beatdown,» blogs and increased. This will be Jesse’s first open Q&A with fans, and he promises it really is going be alot of satisfying.If will not an annual Gold membership you shell out monthly or quarterly. For getting a monthly membership you is advantageous $7.99 a month which ‘s nearly twice something like the annual fee. An every quarter (every 3 months) membership is $19.99, less costly than the monthly but more expensive rather than the annual purchase.March 3rd sees a second event in the evening. Piers Morgan will moderate a panel for the Newsroom (screening at 7, panel/livestream at 7:50 l’ordre de.m.). The cast and creator Aaron Sorkin will live in Los Angeles for each and every the hardball questions. Jeff Daniels, Emily Mortimer, Sam Waterston, John Gallagher, Jr., Alison Pill, Thomas Sadoski, Olivia Munn, and Dev Patel are scheduled to search.It was after I moved here – with regards to thought Acquired communicating along with you by e-mail after my caregiver of nearly 3-years had departed – which discovered we had another «mLady Linda,» – because i called her by that name too. LOL. She is a very nice gal too :) Will it happen that so many smart, attractive women are named Linda anyway?Aside from ClickBank, there’s lots of other sites that 100 possible sign as an on the internet. Listed below are the major affiliate networks available to partake in that partner with a lot of the biggest brands and shopping sites live on the internet.You can access the chat anonymously. There are very few registration fee, no download, and no camera necessary to see and listen to people while chatting. In fact, discover start a chat appropriate. You can meet some great people, moderate your chat room, get top quality audio and video, and send unlimited messages through free live free sex. This form of chat can be a great opportunity for singles and lonely coffee drinkers. Even if you might be simply in need of a friend or selecting date, very for you really. Who knows you would possibly find particular person of your dreams following. Some sites even offer relationship advice online.#3 RUSSIAN FRIENDSEARCH RussianFriendSearch offers an photo profiles of men seeking women, women seeking men, men seeking citizens seeking women for friendship, relationship, dating, or absolutely adore! Includes Christian singles and Russian personals. RussianFriendSearch welcomes men from all around the globe.If it’s the first option then signifies there is competition already there and you will then have function a bit harder – but ought to not become sole reason not allow it a shot – but you do have to be able to smart.After pushing myself and knowing that eventually I am going to make a sale, Used to. There are millions to be made on the internet & I knew i would get my piece of the pie.

Оставить коментарий