Here are a couple of wave files that can be used to crowd-source the testing and development of 700C:
i) http://rowetel.com/downloads/codec2/700c_tune/sine_analog_700c.wav ii) http://rowetel.com/downloads/codec2/700c_tune/sine_analog_testframes700c.wav Each file consists of three signals, a 1000Hz sine wave, analog, and 700C. (i) contains Codec 2 700C vocoder frames, (ii) contains fixed test frames useful for measuring bit error rate. The three signals are at the same RMS power, so we can use them to compare SSB versus 700C objectively. The sine wave at the start can be used to measure the actual SNR. The idea is: i) The Tx station plays these files through their SSB tx. ii) the Rx station records them and various SNRs and channel conditions, e.g. high SNR, low SNR, fading. They can be recorded using FreeDV, or any wave recorder. Using FreeDV lets you monitor the received signal yourself, e.g. measure BER in testframe mode (Tools- Options menu), or monitor the speech quality. Pls use 8kHz, mono, 16-bit integer wave files. iii) email recorded wave files to me. I'll be tx-ing these files on 7.177 MHz in .au over the next few days and weeks and gathering some results on 700C performance. Thanks, David ------------------------------------------------------------------------------ Announcing the Oxford Dictionaries API! The API offers world-renowned dictionary content that is easy and intuitive to access. Sign up for an account today to start using our lexical data to power your apps and projects. Get started today and enter our developer competition. http://sdm.link/oxford _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
