FreeDV COHPSK

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FreeDV COHPSK
700 tfc DV.png
Frequencies 3 MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
,30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
3,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
- 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation PSKPhase-Shift Keying
ACF
Bandwidth 1500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).1.5 kHzKiloHertz (kHz) 10^3 Hz
0.0015 MHzMegaHertz (MHz) 10^6 Hz
1.5 kHzKiloHertz (kHz) 10^3 Hz
0.0015 MHzMegaHertz (MHz) 10^6 Hz
1.5 kHzKiloHertz (kHz) 10^3 Hz
0.0015 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description FreeDV Coherent PSKPhase-Shift Keying (Also known as FreeDV 700) is a robust Digital Voice mode developed by David Rowe for his FreeDV Digital Voice Software.
I/Q Raw Recording
Audio Sample
FreeDV Coherent PSKPhase-Shift Keying (Also known as FreeDV 700) is a robust Digital Voice mode developed by David Rowe for his FreeDV Digital Voice Software. The 14-subcarrier QPSKQuadrature Phase-Shift Keying (2 bits per symbol) mode uses pilot symbol assisted coherent PSKPhase-Shift Keying, whereas FDMDV uses differential PSKPhase-Shift Keying. Coherent PSKPhase-Shift Keying is more robust against bit errors than differential PSKPhase-Shift Keying. This mode has 14 subcarriers, but it's actually 7 75bd subcarriers duplicated to form the full 14, so there is strong redundancy. The entire system runs at 700 bit/sBits per second (bps), using the 700 bit/sBits per second (bps) Codec 2 voice codec developed by Rowe.

This mode is currently in active development, so details may change significantly as development continues.


Samples (July 2015)[edit]

Traffic Idle
700 tfc DV.png
700 idle DV.png

Voice Sample Comparison[edit]

Original voice sample:

FreeDV COHPSK

Decoding Software[edit]

Hobby Level Software

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]