Project Title

Generate continuous pure audio tone (fixed frequency) based on varying value from a log file.

Getting Started

To clone or download use

git clone [email protected]:SciTechDude/VaryAudioOnLogChange.git

Or Use
https://github.com/SciTechDude/VaryAudioOnLogChange.git

Prerequisites

Need following external python modules

• pyaudio
• numpy

Description

While working with OP at stackoverflow to solve an interesting problem. OP needed a solution that will generate continuous pure audio tone that varies with change in log value. After much research , trial and error a solution was deviced based on following pyaudio

Pyaudio provides a non-blocking callback method that allows real-time manipulation of audio stream. The audio stream callback function gets new value value if its received by probing log file The new value then generates a different audio tone thats related to log value. The new frequency/tone is then converted to stream using numpy and fed into PyAudio

The audio tone is popping / cracking free that usually occurs when mixing two audio tones/frequencies mid-stream.

A sample log file is provided that has WiFi mac + RSSI data. The program filters RSSI value from last line of code and changes frequency accordingly

Running the test / Program

Run following script in a mac / linux terminal

python realTimeLogAudio.py  probemon.log

Run following in another terminal

>probemon.log
cat mon.log |while read line; do sleep 1; echo $line >>probemon.log; done

Switch back to first terminal to hear audio and data flowing

mac:default , rssi:0.0 , freq:0 Hz
mac:d8:8f:76:1a:cb:65 , rssi:-43 , freq:430 Hz
mac:04:4f:4c:77:72:8f , rssi:-51 , freq:510 Hz
mac:20:39:56:af:51:49 , rssi:-39 , freq:390 Hz
mac:20:39:56:af:51:49 , rssi:-45 , freq:450 Hz
mac:5e:e2:1d:a3:d2:da , rssi:-47 , freq:470 Hz
mac:5e:e2:1d:a3:d2:da , rssi:-49 , freq:490 Hz
mac:12:84:16:9c:75:ee , rssi:-43 , freq:430 Hz
mac:da:a1:19:71:4d:0c , rssi:-55 , freq:550 Hz
mac:d8:8f:76:1a:cb:65 , rssi:-49 , freq:490 Hz

Note: Above mac addresses are fake and do not relate to my personal / work data.

Authors

• Anil Mandra - Initial work - SciTechDude

License

This project is licensed under the MIT License - see the LICENSE.md file for details

Acknowledgments

• Inspiration