The software required to add video to digital voice
See the "Operating" page for settings and adjustments for the FreeDV plus Video software.
Setup for FreeDV plus Video: Video TX/FreeDV Software
When a higher-performance PC is available, the Video TX, FreeDV, and Video RX software are installed on the same PC.
Signal flow diagram: A software signal flow diagram is shown below.Volume Mixer: FreeDV plus Video uses Volume Mixer to control the digital voice and video output levels.
FreeDV: For transmitting, this software encodes the analog speech signal and generates the multi-carrier voice component of the FreeDV plus Video signal. The multi-carrier voice signal is summed with the multi-carrier video signal at the "Speakers (USB Audio Device)" output. Also, the FreeDV software processes the multi-carrier voice component of the received signal and decodes the signal back to analog speech. The FreeDV "1600" or "700D" mode is used for FreeDV plus Video.
TXfftCO5L: This software, part of the FreeDV plus Video suite, processes live webcam video or recorded AVI file video and generates the multi-carrier video component of the FreeDV plus Video signal. This signal is summed with the FreeDV multi-carrier signal to form the composite FreeDV plus Video signal. The Volume Mixer slider controls are adjusted to set the amplitude of the video sub-carriers with respect to the fixed FreeDV sub-carrier amplitudes. The Speakers (USB Audio Device) playback level is adjusted to set the TX output power from the transceiver. This composite baseband signal appears at the "Speakers (USB Audio Device)" MFJ-1204 output. Click the link below to download the FreeDV plus Video suite. Read the PDF document "ANAN-10E FreeDV+ Setup", included in the download, for more information.
FreeDV plus Video (1600 or 700D) Link
Instructions for level adjustments and other settings for these applications are found on the "Operating" page of this website.
Summing of the video (TXfftCO5L) and FreeDV baseband signals: A description of the summing process follows:
1: The baseband video (TXfftCO5L) signal path: This signal appears at the "Speakers (USB Audio Device)" output, summed with the FreeDV signal. The amplitude of the video sub carriers can be adjusted using the Volume Mixer slider controls (the TXfftCO5L software is designed so that its output appears at the default output).
2: The baseband FreeDV signal path: This fixed-amplitude signal also appears at the "Speakers (USB Audio Device)" output of the MFJ-1204, summed with the FreeDV signal, as a result of a setting in the FreeDV software (under "Audio Configuration").
Setup for FreeDV plus Video: Video RX SoftwareSignal flow diagram: A software signal flow diagram is shown below.RXfftDIFF7L: This software, part of the FreeDV plus Video suite, processes and displays the video component of the composite FreeDV plus Video signal. The download link for the FreeDV plus Video suite is given above.
WinWarbler: This software provides a waterfall display with AFC tracking useful for tuning the video component of the composite FreeDV plus Video signal. Click the link below to access the website from which the WinWarbler software can be downloaded.
WinWarbler Link
Instructions for level adjustments and other settings for these applications are found on the "Operating" page of this website.
Screenshot: The screenshot below shows, starting clockwise from the upper left-hand corner:
WA6NUT is receiving voice and video from the other station. Video (Microsoft WNDSURF1.AVI) is being displayed on the RXfftDIFF7L GUI. WA6NUT is ready to send camera video back to the other station. The Volume Mixer bargraph displays are monitoring the TXfftCO5L and FreeDV output levels. Click the link below for a YouTube video showing an older Windows 7 setup. Mouse over the screenshot to enlarge.
FreeDV: Used to encode mic audio and generate FreeDV component of FreeDV+ signal, also to decode FreeDV signal for output to speakers TXfftCO5L: Used to generate video component of FreeDV+ signal Volume Mixer: Used to adjust video level with respect to FreeDV level FreeDV: Another instance is used to pass the received video signal to the Stereo Mix block RXfftDIFF7L: Used to process and display received video WinWarbler: Used to adjust transceiver RX tuning for best video quality
YouTube Link
Screenshot of PC running Video TX, FreeDV and Video RX software (Windows 11)
Batch File: The screenshot above shows FreeDV+ running with six apps. With a batch file, all the apps can be opened simultaneously, with just a double-click on an icon (shortcut) on your PC's desktop. Click on the link below to find how to do this (it's not difficult).
Batch File Link
Test Signal: If you've followed the instructions on the "Hardware" and "Software" pages, you're almost ready to get on the air with FreeDV+. But first, you might want to check out your receiving setup with a special test WMA file simulating a received FreeDV+ signal. Click on the link below for instructions.
Test Recording Link
- 20 July 2013 -Back to WA6NUT home page
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