This online virtual oscilloscope allows you to visualise live sound input and get to grips with how to adjust the display. If you find this useful, our online spectrum analyser may also be of interest to you.
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An oscilloscope is a useful tool for anyone working with electrical signals because it provides a visual representation of the signal's shape, or waveform. This allows you to measure properties of the wave, such as amplitude or frequency.
The initial signal above is a 200Hz sine wave, which has an amplitude of 5 volts. The frequency of this wave can be adjusted by using the "Input Wave Frequency" slider. (You can also choose to display a square wave.)
If you are browsing using the latest version of Google Chrome, the input dropdown box allows you to select "live input". This will take data from any microphone connected to your computer and display the live audio data. (Different microphones send different voltages to the computer, so for consistency we have normalised the input so the raw input signal will always be limited to somewhere between -5 and +5 volts.)
Since waveforms come in a wide variety of shapes, amplitudes and frequencies, oscilloscopes need to have a number of controls to adjust the display of the waveform so it can comfortably fit inside the viewport.
Freeze live input This tickbox freezes the input allowing you to effectively take a snapshot of what is displayed on the oscilloscope at a given instant in time. This is especially useful because you can still adjust the time base and volts per division setting. Try whistling and freezing the input. Adjust the timebase to a convenient scale allows you to calculate the frequency of your whistle by counting the period of one complete waveform.
Oscilloscope gain This is a number that the incoming signal is multiplied by. A gain of 1 will have no effect, a gain of less than 1 will make the signal smaller and a gain of more than 1 will make it larger.
seconds / div This control allows you to adjust the length of time that each square of the grid represents. When the oscilloscope is first loaded, this setting is set at 1ms, and shows one complete waveform over 4 squares. This means that the period of the wave is 4ms, or 0.004s, giving a frequency of (1/0.004) = 250Hz. If you change the timebase to 500µs (half of what it started at), you should see the waveform now takes 8 squares to complete one full oscillation. The period (and hence the frequency) remain constant because 8 times 500µs still equals 0.004s.
Reductio ad absurdum
is a Latin term that means “to reduce something to absurdity.” It is a
figure of speech
that is defined as a manner of arguing something for one’s own position by showing the absurdity of the position of his opponent. In simple words, it means to reduce an
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to absurdity, by drawing conclusions with logical limits, or by showing ridiculous consequences. Reductio ad absurdum in satires breaks down an idea to the point of absurdity.
Reductio ad absurdum examples cannot be used as an appeal to ridicule. Though both devices are extensively used in satire , an appeal to ridicule is the use of ridiculing a situation without arguing or explanation; while, reductio ad absurdum pursues arguments and logical consequences.
“Five hours, (and who can do it less in?) By haughty Celia spent in dressing; The goddess from her chamber issues, Arrayed in lace, brocades and tissues…
Her ointments, daubs, and paints and creams, Her washes, slops, and every clout Such order from confusion sprung, Such gaudy tulips raised from dung.”
Swift uses reductio ad absurdum as a satirizing technique here. In this case, the purpose is to ridicule the duality of individuals in their private and public spheres.
“I think it is agreed by all parties, that this prodigious number of children in the arms, or on the backs, or at the heels of their mothers, and frequently of their fathers, is in the present deplorable state of the kingdom … cheap and easy method of making these children sound and useful members of the common-wealth, would deserve so well of the publick, as to have his statue set up for a preserver of the nation.”
This is one of the more famous examples of reductio ad absurdum in English literature. Here, Swift uses reductio ad absurdum by arguing about social conditions to ridiculous lengths. This highlights a horrific situation of children.
ESTRAGON: “That’s the idea, let’s ask each other questions …” “Nothing happens, nobody comes … nobody goes, it’s awful …” ESTRAGON: “What did we do yesterday?” VLADIMIR: “What did we do yesterday?” ESTRAGON: “Yes.” VLADIMIR: “Why … (Angrily.) Nothing is certain when you’re about … ESTRAGON: “ In my opinion we were here .”In my opinion we were here
Search Replace DB version 3.1.0 is a user-friendly, front-end tool for developers, that allows you to carry out database wide search/replace actions, that don't damage PHP serialized strings or objects.
It has come to our attention that some users have been leaving this script on their servers despite advice to the contrary. Due to the very real dangers it can present when used that way, we now ask that you complete a form where we make sure you’re aware of these risks in order to receive the download link. Do also carefully read the installation instructions below.
Please check your spam folder for the download link before you email us for support. If you are still experiencing problems, email us politely with your query.
Download the script from the link you received by email, and install it to a secret folder with an obfuscated name. Your server should also not be set to provide directory lists.
A typical WP install with this script would have the folders as follows:
/your-secret-search-replace-folder /wp-admin /wp-content /wp-includes
Do not install Search Replace DB to the root folder or in WP’s own folder hierarchy or you risk all sorts of potential problems. Just don’t. It must run in its own folder.
To see how you can use this tool to aid migrations, check out our article on WordPress migrations or visit the WP Tuts+ article that mentions this script .
If you are in any doubt whatsoever about how to use this standalone script, then please consider getting an expert in. It’s a really powerful bit of code that if used badly can damage a WP install beyond repair. If you want help, get in somebody like us, for example, or any of the other great guys listed over at CodePoet.
The code is supplied under the
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and is fully open source. Do be aware that this means people can change this code and offer it up, and that other versions may be worse… or better. It is code for developers, by developers, and you should only use code from sources you trust.
Please beware of adverts below that offer a download button, but adverts do allow us to partly cover the cost of running this project.
In a directory on your webserver. It can be an httpauth protected folder if it’s a public facing webserver.
Yes – it’s a development tool, not something you should be putting on production servers. If you do put it on a production server be really careful. We’re trying to work out ways of protecting users further, because it turns out that this tool is being recommend by webhosts around the world, but too often to quite naive users who don’t really understand the risks.
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