Author: Tom Zicarelli

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pifm r-pi transmitter

notes

How to stop pifm from broadcasting:

http://www.raspberrypi.org/forums/viewtopic.php?t=59239&p=443857

An alternative r-pi transmitter using Sony Ericsson mmr-70 https://github.com/Manawyrm/FMBerry

A playlist script http://bytesare.us/cms/index.php/geeky-toys/pi-as-fm-radio-mp3-transmitter

bandpass filter http://www.radio-electronics.com/info/rf-technology-design/rf-filters/simple-lc-bandpass-filter-design.php

pigpio library (to edit gpio pins) http://abyz.co.uk/rpi/pigpio/

WSPR transmitter using r-pi https://github.com/threeme3/WsprryPi (also a project here called piBits that does fm transmitter)

cw  beacon xmtr http://hackaday.com/2013/01/25/raspberry-pi-used-as-a-beacon-transmitter/

sub transmitter (claimed): http://www.southgatearc.org/news/may2013/ssb_using_a_raspberry_pi.htm#.U1iZ1F4ifnk and here: http://wsprnet.org/drupal/blog/1522

 

 

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ep-4yy13 DSP – week 12

reversability and demodulation

methods

examples

download example Max patches

This is an 11M file

[wpdm_file id=17]

assignment

Make a prototype. Become famous

 

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Milton Babbitt – solo piano 1985

(This link is broken 4/13/2015)

http://youtu.be/HPj4iyKcPkM

Here is a Youtube review of the piece from @ateaytu 

“So it has come down to defending composition by arguing it is has some form of aesthetics when compared a drunk stumbling against the piano? The whole genre is garbage. Babbitt’s ‘music’, not his mathematics background, where he went to school or even his musical ability, is of focus. Here is a man that fits the definition of ‘brilliant’ but like many other artists chose to squander his talent on utter garbage. This primitive ugliness will forever be a source of ridicule and shame.”

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rtlsdr, Pd, linux

notes

Today was able to get the rtlsdr~ object running in Pd on Ubuntu 14.04 on a Macbook pro.

Audio quality seems rough. The only driver I could get to work was Alsa at 44.1KHz – may be able to get help with this from Pd community.

Ended up using 64bit libraries for librtlsdr and libusb-1.0 . In fact, needed to using the shared (.so) libraries, not the static ones (.a) due to a weird linker error. Its possible that it happened due to mixing shared and static and I might try again using both static for these 2 libs.

See notes from previous post about issues with USB capture, and non-root user in Linux – there are 2 flags on the cmake for rtlsdr that might help resolve both of these, but I wasn’t having any luck and needed to use the method described in previous post.

The source code for linux version is in the /usr/lib/pd-extended/extra/rtlsdr~ folder – and the test pd file is in ~/pd/rtlSDR-block.pd, along with some abstractions.

There is also a makefile to build a local version of rtl_fm (rtl_fm3.c) in ~/rtl-sdr-new/rtl-sdr/rtl-fm3/

This makefile mixes the static and shared libs with no problem… hmm…?

next

Need to package this stuff up and send it to pdsdr github with source for Max/Pd on mac and Pd on linux. + instructions… etc.,

Would like to try running on r-pi – but will need to adapt the test patch to receive Osc messages because there is no gui on r-pi

Also I am some skeptical about running at low sample rates for audio – we’ll see…

another note

Just thinking, that even if I am not able to run rtlsdr~ on r-pi that we could adapt rtl_fm so it receives control input from Pd using Osc and work that way…