>... However, the audio fragment given (?session 509), annotates it as "continuation of session 508". Perhaps it may have some additional panorama data for the 8th session panorama.
Relistening to the sample, it appears that narrator announces turning ON the RIFMA just before the supposed data signal begins. I would rather interpret this data as relating to the spectral analysis of the Lunar soil, not the panorama data stream.
Both feeds supposedly use the same transmission system. RIFMA signal is modulated in the same way as the signal from cameras 1 and 4 (which could be sent simultaneously on separate sub-carriers).
On reception the signal is filtered, demodulated, and then recorded (including onto the magnetic tape). This means that the signal we hear on the sample has been already demodulated and probably represents some kind of bit-stream. The panoramas were also recorded onto thermal paper, akin Fax, not necessarily with the same protocol though.
Panorama data is known to be transmitted at 4 lines/sec, each (vertical) line is 500 pixels. So the bit rate could be around 500 x pixelbits x 4=2000 x pixelbits per sec. There should likely be some control bits.
The 4 minute sample chunk then would contain around 240 x 2000 x pixelbits of data (960 lines). Assuming 8-bit pixels, this yields about 450KB. However, it as well could be 1-bit black or white.
If indeed it's RIFMA data, then it's hard to guess the data format. In case of panorama data, at least there's a chance of simply interpreting it as a stream of intensities.
This also leaves open the question of determining the 0/1 encodinng in the recorded "audio" signal (? Freq/delay modulation)
Also the sample appears to be essentially mono doubled to both channels, instead of data and narration on separate tracks as supposedly is on the tape. This bleeds the hum and buzz ?from the narrator's mic onto the data feed.
Perhaps you could re-record the tracks/channels separarely for better chance at the data track analysis.
Relistening to the sample, it appears that narrator announces turning ON the RIFMA just before the supposed data signal begins. I would rather interpret this data as relating to the spectral analysis of the Lunar soil, not the panorama data stream.
Both feeds supposedly use the same transmission system. RIFMA signal is modulated in the same way as the signal from cameras 1 and 4 (which could be sent simultaneously on separate sub-carriers).
On reception the signal is filtered, demodulated, and then recorded (including onto the magnetic tape). This means that the signal we hear on the sample has been already demodulated and probably represents some kind of bit-stream. The panoramas were also recorded onto thermal paper, akin Fax, not necessarily with the same protocol though.
Panorama data is known to be transmitted at 4 lines/sec, each (vertical) line is 500 pixels. So the bit rate could be around 500 x pixelbits x 4=2000 x pixelbits per sec. There should likely be some control bits.
The 4 minute sample chunk then would contain around 240 x 2000 x pixelbits of data (960 lines). Assuming 8-bit pixels, this yields about 450KB. However, it as well could be 1-bit black or white.
If indeed it's RIFMA data, then it's hard to guess the data format. In case of panorama data, at least there's a chance of simply interpreting it as a stream of intensities.
This also leaves open the question of determining the 0/1 encodinng in the recorded "audio" signal (? Freq/delay modulation)
Also the sample appears to be essentially mono doubled to both channels, instead of data and narration on separate tracks as supposedly is on the tape. This bleeds the hum and buzz ?from the narrator's mic onto the data feed.
Perhaps you could re-record the tracks/channels separarely for better chance at the data track analysis.