FreeDV

Contents:
  1. Biulding FreeDV (codec2 based vocoder) on the Raspberry Pi
  2. FreeDV QSO Finder
    1. AMBE - Advanced Multiband Excitation
  3. David Rowe's Codec2
    1. FDMDV - Frequency Division Multiplex Digital Voice (AMBE Vocoder based)

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Related Pages:
  1. Digital Modes

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FreeDV

FREEDV: OPEN SOURCE AMATEUR DIGITAL VOICE:
https://freedv.org/

User Manual:
https://github.com/drowe67/freedv-gui/blob/118cb66ee4679518185db871ec0ae68071c406a4/USER_MANUAL.md

Download FreeDV:
http://www.rowetel.com/downloads/freedv/

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Building FreeDV (codec2 based vocoder) on the Raspberry Pi

FreeDV software can be used with the RPi to add a small, low-power, free software digital voice (DV) modem to an HF radio.

Matt Roberts - matt@kk5jy.net Published: 2018-03-12 Updated: 2018-03-28
Matt Roberts KK5JY - Building and Running FreeDV on Raspberry Pi



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FreeDV QSO Finder

FreeDV QSO Finder

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Here are some videos about the SM1000 FreeDV Adpapter:
Youtube - David Rowe VK5DGR presents on codec2 and SM1000
HRN 193: Digital Voice is Exploding (maybe) on HamRadioNow - David Rowe VK5DGR
David VK5DGR spoke at AREG on the 15th of May 2015 about his FreeFV project to get
digital voice working on HF and his latest device, the Sm1000 embedded modem that
allows FreeDV to be adapted onto almost any radio.
https://vimeo.com/128064782"> Vimeo - IntrodJumbospot.htmlucing FreeDV Digital Voice on HF and the SM1000 Embedded Modem

http://www.rowetel.com/?page_id=3902
David Rowe VK5DGR - Home Page
http://www.mw0mwz.co.uk/

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AMBE - Advanced Multiband Excitation

AMBE - Advanced Multiband Excitation

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David Rowe's Codec2

Codec2 is an open source alternative which uses half of the bandwidth of AMBE to encode speech of similar quality, created by David Rowe and lobbied by Bruce Perens. Codec2 still continues to evolve, with additional "modes" being developed, refined and made available on a continuous basis. This has resulted in an open source codec that has progressively increased its robustness and performance – when subjected to some of the most challenging RF and acoustic environments.

FDMDV - Frequency Division Multiplex Digital Voice (AMBE Vocoder based)

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FDMDV - Frequency Division Multiplex Digital Voice

FDMDV (Frequency Division Multiplex Digital Voice) is based on 15 carriers using the 1400 LPC CODEC. High power in each carrier combined with a narrow 1.125 KHz bandwidth provide good robustness with fast sync for a near SSB experience. FDMDV is new and not derived from DRM technology.

FDMDV - Digital Audio over HF SSB



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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20201230 - pre published v0.9