Latest recipes tagged "scope"

Bash Script For An Oscilloscope... (Bash)

2013-06-19T19:06:50-07:00

Bash recipe 578570 by Barry Walker (anim, audio, audioscope, bash, oscilloscope, scope, script, sound_exchange, sox, terminal).

This code is the latest as of 19-06-2013. It is an AudioScope designed around a Macbook Pro 13" of which only has ONE microphone input. It works under Linux variants too. Read the code for much more info.

It was my way of learning Bash scripting.

It is resident here at this site:-

http://www.unix.com/shell-programming-scripting/212939-start-simple-audio-scope-shell-script.html

It started off as a fun idea and is now becoming a very serious project.

As it stands this is fully working but it is uncalibrated and this is where it will stay on this site.

As the above site is the host then all future uploads will be there...

To do list...

DC input. [1] DC polarity. [1] 2 more Internal sync modes. External triggering. Zoom facility - if possible in text mode. Vertical calibration. [2] Frequency measurement. {3] (Others.)

[1] I have simple HW built as an idea but yet to prove it... [2] Preliminary HW built but not yet used. Calibration SW and circuit(s) to be built into script as it progresses. [3] I already have a working script but not completely satisfied at it at this point...

I am noing to say much else except that it has already been given a 5 star rating on the above UNIX site...

As it stands this code is entirely Public Domian and you may do with it as you please...

Enjoy something completely different using Bash scripting...

Finally the code defaults to a DEMO mode which requires no HW access at all but everything is still functional...

__Thoroughly__ read the code for more information...

As a circuit is inside the script then it is best viewed in plan text mode.

Bazza, G0LCU.

For MacBook_Pro-Heads Only. Simple LF Audio Oscilloscope Using Standard Text Mode Python. (Python)

2012-10-07T14:15:55-07:00

Python recipe 578282 by Barry Walker (anim, apple, audio, demo, display, macbook_pro, oscilloscope, pyaudio, scope, sound).

For MacBook_Pro-Heads Only. Simple LF Audio Oscilloscope Using Standard Text Mode Python.

SimpleScope_OSX.py

Do you remember this upload from myself on 26-06-2011...

http://code.activestate.com/recipes/577771-simple-lf-audio-oscilloscope-using-standard-text-m/?in=user-4177147

Well here is an August 2012 vintage MacBook Pro 13 inch version of it for OSX 10.7.5...

This is proof of concept code for a kids level project I am doing for a MacBook Pro, 13 inch, OSX 10.7.5. A DEMO to show how to display a waveform using standard text mode Python. "pyaudio" must be installed for this to work. Levels are set using the standard audio mixers, (System Preferences -> Sound).

Just whistle a signal of say 300Hz to 3KHz, (normal voice spectrum), using say, the internal mic, and watch a waveform appear inside the X-Y graticule.

Read the code for more information.

This code is GPL2, but, the hardware information is Public Domain.

(I am looking into including Windows and Linux variants too using pyaudio to access the sound system.)

Enjoy finding simple solutions to often very difficult problems.

Bazza, G0LCU...

Simple LF Audio Oscilloscope Using Standard Text Mode Python. (Python)

2011-06-26T21:42:55-07:00

Python recipe 577771 by Barry Walker (anim, audio, demo, display, linux, oscilloscope, scope, sound).

A Linux DEMO to show how to display a waveform using standard text mode Python. The audio device /dev/dsp is used and must be available. Levels are set using the standard audio mixers.

Just feed a signal of say 300Hz to 3KHz, (normal voice spectrum), using say, the internal mic, and watch the waveform appear inside the X-Y graticule.

This method WILL be used for a program proper and may be uploaded to this site in the future.

Read the code for more information.

This code is Public Domain and you may do with it as you please.

Enjoy finding simple solutions to often very difficult problems.

Simple LF Audio Oscilloscope Using Standard Python. (Python)

2011-04-07T17:17:57-07:00

Python recipe 577644 by Barry Walker (anim, audio, demo, display, linux, oscilloscope, scope, sound).

AudioScope.py

I think this might be a first for both Python.

Initially uploaded to LXF, now also here under the MIT licence.

I am building a kids level seismometer and wanted to use standard Python inside Linux.

This DEMO code was my starter idea and looks as though using standard ASCII only might just work a real treat.

I've issued it to LXF under the MIT licence for future reasons.

It doesn't look much on screen except that the waveform(s) shown is/are a basic visual, electrical representation of your voice. ;o)

It is possible to link the earphone socket on this notebook to the mic input and start the Audio Function Generator, elsewhere in this site, in a separate Python terminal and see those waveforms inside the AudioScope.py`s own Python terminal.

This grabs a 1 second 8KB burst, and then displays it onto the Python terminal. The timebase, amplitude, trigger, single shot and others are not included but the main grab and display using /dev/dsp is shown. This can be made platform independent by changing the /dev/dsp to something external like the Arduino Dev Board. This uses STANDARD Python 2.5.x and later and tested on PCLinuxOS 2009 and Debian 6.0.0.

Enjoy finding simple solutions to often very difficult problems.

Bazza, G0LCU.

Decorator to expose local variables of a function after execution [alternative implementation] (Python)

2010-07-08T09:44:28-07:00

Python recipe 577295 by Andrea Maffezzoli (decorator, function, inner, local, scope, variables). Revision 6.

Please note that the present is a fork of the recipe 577283 "Decorator to expose local variables of a function after execution" of Pietro Berkes, available at http://code.activestate.com/recipes/577283-decorator-to-expose-local-variables-of-a-function-/ , and aiming only to report the alternative implementation "persistent_locals2", whose I'm co-author with Pietro Berkes, and which was submitted together to the original recipe. Refer to the latter for an exhaustive description and discussion.

Decorator to expose local variables of a function after execution (Python)

2010-07-07T22:01:23-07:00

Python recipe 577283 by Pietro Berkes (decorator, function, inner, local, scope, variables). Revision 2.

Decorator to expose the local variables defined in the inner scope of a function. At the exit of the decorated function (regular exit or exceptions), the local dictionary is copied to a read-only property, locals.

The main implementation is based on injecting bytecode into the original function, and requires the lightweight module byteplay (available here). See below for an alternative implementation that only uses the standard library.