detect

iOS: Accurately determining energy of a bump from accelerometer output

由 久未见 提交于 2019-11-27 14:16:12
问题 I am creating a tuning fork app, where you pat the iPhone into the palm of your other hand, or against a soft surface in order to set the fork zinging. So I would like to detect the energy contained in each 'bump' (EDIT: Removed a ton of gumpf) Can anyone help me crack this one? 回答1: Thanks to one of the wizards on freenode's #math channel (thanks Igor), I have a really good working solution. You use the standard method to fire a callback at the maximum frequency possible (100Hz), which will

Detect if a file is an MP3 file?

由 微笑、不失礼 提交于 2019-11-27 14:06:50
问题 I'm writing a C++ library for decoding and encoding audio between different formats/codecs. I have a routine for quickly detecting the format before loading the required codec library. For WAV files one can simple look for the ASCII values "RIFF" and "WAVE" at the start of the file. The same applies to FLAC, we can simply read in the first 4 bytes, which will be "fLaC". But how can I quickly detect if a file is MP3? I can't rely on the file extension. I also can't try to decode the first MP3

Detecting the fundamental frequency [closed]

由 风格不统一 提交于 2019-11-27 11:43:10
There's this tech-festival in IIT-Bombay, India, where they're having an event called "Artbots" where we're supposed to design artbots with artistic abilities. I had an idea about a musical robot which takes a song as input, detects the notes in the song and plays it back on a piano. I need some method which will help me compute the pitches of the notes of the song. Any idea/suggestion on how to go about it? This is exactly what I'm doing here as my last year project :) except one thing that my project is about tracking the pitch of human singing voice (and I don't have the robot to play the

Detect only screenshot with FileObserver Android

由 荒凉一梦 提交于 2019-11-27 11:33:14
问题 I am currently developing an application for Android and wanted to know how to detect a screenshot. I tried with FileObserver but the problem is that all events are detected ( when device goes into sleep, message, etc. ) . How to detect only screenshot ? Thank you in advance ! 回答1: How did you use FileObserver to detect screen shot creation? When using FileObserver , only monitor the file creation event in screen shot directory. String path = Environment.getExternalStorageDirectory() + File

iphone SDK detect Wifi and Carrier network

由 我只是一个虾纸丫 提交于 2019-11-27 10:02:54
问题 my app accesses the internet and i just want to detect whether there is a connection either via wifi or via carrier data network or not apple has made an example for that "Reachability" https://developer.apple.com/iphone/library/samplecode/Reachability/ i think it just detects the wifi and not the carrier network can anyone tell me, whats the best to be done to detect if there's a connection ( any type of connection ) Appreciate ur help! 回答1: That sample is exactly what you need. Look at

How to “correctly” detect DPI of display with Java?

由 故事扮演 提交于 2019-11-27 08:55:21
I have the following app that draws a rule : public class Rule extends JComponent { public static final long serialVersionUID=26362862L; // public static final int INCH=Toolkit.getDefaultToolkit().getScreenResolution(); public static final int INCH=(int)(Toolkit.getDefaultToolkit().getScreenResolution()*1.15); // Auto adjust this 1.15 ? public static final int HORIZONTAL=0; public static final int VERTICAL=1; public static final int SIZE=35; public int orientation; public boolean isMetric; private int increment; private int units; // private Color rule_color=new Color(0,135,235); private Color

java - Detect Mouse Clicks Anywhere On Screen

由 醉酒当歌 提交于 2019-11-27 08:33:07
问题 I want my app to detect mouse clicks anywhere on the screen without having to have the app focused. I want it to detect mouse events universally even if its minimized. So far I've only been able to detect mouse events within a swing gui. Autohotkey can detect mouse clicks and get the mouse's position at any time, how can I do this with java? 回答1: It is possible with a little trick. Should be 100% cross-platform (tested on Linux & Windows). Basically, you create a small JWindow, make it

Detect and record a sound with python

由 感情迁移 提交于 2019-11-27 08:07:47
I'm using this program to record a sound in python: Detect & Record Audio in Python I want to change the program to start recording when sound is detected by the sound card input. Probably should compare the input sound level in chunk, but how do this? tgray You could try something like this: based on this question/answer # this is the threshold that determines whether or not sound is detected THRESHOLD = 0 #open your audio stream # wait until the sound data breaks some level threshold while True: data = stream.read(chunk) # check level against threshold, you'll have to write getLevel() if

Detect chinese character using perl?

由 那年仲夏 提交于 2019-11-27 07:21:40
问题 Is there any way to detect Chinese characters using Perl? And is there any way on how to split Chinese characters with symbol dot '.' perfectly? 回答1: Depends on your particular notion of what is a Chinese character. Perhaps you're looking for /\p{Script=Hani}/ , but if we want to cast our net wide, the following regex pattern will match stuff that occurs in Chinese writing. Restrict if necessary. use 5.014; / (?: \p{Block=CJK_Compatibility} | \p{Block=CJK_Compatibility_Forms} | \p{Block=CJK

How can I detect 'any' ajax request being completed using jQuery?

由 我与影子孤独终老i 提交于 2019-11-27 05:37:33
问题 I have a page where I can insert some javascript / jquery to manipulate the output. I don't have any other control over the page markup etc. I need to add an extra element via jquery after each present on the page. The issue is that the elements are generated via an asynchronous call on the existing page which occurs after $(document).ready is complete. Essentially, I need a way of calling my jquery after the page has loaded and the subsequent ajax calls have completed. Is there a way to
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