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Reva

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About Reva

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    Electrical engineering
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  1. Published 2017-01-18: https://www.soundonsound.com/news/rode-announce-six-new-mics-soundfield-video-mic The originally presented prototype looked different from the more recent one discussed above which shares some mechanical body similitudes with the SVMX.
  2. The cylindrical Li-Ion cells I was referring to are max. approx. Diameter 19 mm x Length 66 mm (mass: 44 g) and one cell can power the device for about 35 h. Indeed I expect that the power required to generate the timecode (as long as no LCD backlight is on) to be so small that it won't affect the discussed figures. With a 4-cell battery you could power the device during 140 hours (or 5 days and 20 h non-stop). Using supercaps would allow comfortable time to hot-swap batteries while device is kept running normally. (I was referring to the bare battery cells, there's some small overhead for t
  3. A few details of the aluminum body, like the camera shoe mount and the 9 V battery compartment, look very similar to those of the Rode Stereo VideoMic X (SVMX). No idea about the price but my random guess would rather be in the same range as the SVMX. I expect that inside the camera shoe mount is machined a female 3/8" thread like with the SVMX (thread is compatible with boom poles, stands and other accessories). Also referring to the form of the body I'd expect a pop shield and maybe also a wind shield (deadcat or dead wombat as Rode calls it). Referring to the picture I can't see if those
  4. If we take as example a single cylindrical Li-Ion battery cell of a very common type "18650" with following specs: - Nominal Voltage: 3.6 V - Capacity: 2.9 Ah - Diameter: 18.6 mm, Length: 65.2 mm, Mass: 44 g the energy storage capacity would be (ignoring losses): 10.44 Wh = 0.01044 kWh = 37584 Ws = 37584 J. The basic power requirement would be around 140 mW but we need some power margin for battery management, stabilizing DC/DC and a more or less sleeping general purpose low-power processor. Lets's add 60 mW, so the total maximal power would be: 200 mW = 0.200 W. As batteries specs are
  5. I don't shoot videos using DSLR, but with the body I used to check mechanical noise, especially due to the lens and when settings are changed manually on the DSLR (for example rotating the main or sub dial), will not allow a satisfactory sound quality with a hotshoe mounted mic. IMO even using a shotgun with Rycote lyres camera noise will still be a problem (here not discussing the basic pros and cons of using a hotshoe-mount mic as such). Possibly other cameras and lenses are less problematic but I don't know as I haven't checked it. I used several constant aperture f/2.8 zooms and all caus
  6. RFI sensitivity highly depends on the used GNSS receiver, there are more or less advanced anti-jamming techniques, both based on hardware and software solutions. I expect that modules like the discussed ones to perform well enough in presence of RFI levels like the ones you're referring to, especially also because you don't need continuous time solutions. For the other issue, signal obstruction leading to GNSS service denial, while some receiver/antenna combinations perform better than others, there is obviously no universal remedy. IMO practical tests should be done in order to determine
  7. You're welcome. I just tested the Rode Stereo VideoMic X mounted on a DSLR hotshoe to check mechanical noise issues but I used an external recorder with 48 V phantom power though levels are compatible with typical DSLR external stereo mic inputs and there's a pushbutton to cycle through -20 dB / 0 dB / +20 dB which affects both 3.5 mm TRS and Mini XLR outputs. Cycling is always in the same order which means that for example when 0 dB is set and you want -20 dB you first get +20 dB after pressing the pushbutton once and pressing it again you reach the -20 dB setting. The unbalanced 3.5 mm T
  8. I was referring to UTC because it's a universally available reference, there are not issues related to time zones, daylight saving, time corrections or so. The precision I mentioned corresponds to the specs of relatively cheap modules which can easily be integrated in a design, lower precisions won't allow much lower costs and higher precisions are only required for special purposes (maybe genloc or sampling clock reference), in such case maybe 100 to 300 US$ should be added for a much more precise oven-controlled internal oscillator. When GNSS timing is available the time base precision exc
  9. The Rode Stereo VideoMic X can be powered by an usual 9 V battery and/or with 48 VDC phantom power through the two 3-pin MiniXLR male sockets. I didn't notice any difference between dual phantom power and a new 9 V internal battery but I couldn't test it thouroughly. When battery power is low (wihtout any phantom power provided), Rode mentions that mic performance is degraded. The power LED turns red (if power is good it's green when the mic is ON, obviously when OFF no LED is lit) and I suppose green LEDs are dimmed. Gain and filter settings are remanent even if not powered at all (batte
  10. Thanks for your replies GNSS, which simply means that in addition to GPS, where available, other satellite navigation systems are also used, typically the Russian GLONASS, the other ones not being fully operational yet. For the user it's totally transparent and receivers track as many satellites of any system they can receive and decode (at least within the maximal number of satellites data channels a receiver can track simultaneously). Many receivers are designed to simulatneously track many more data channels (up to 400 or even more) than they can actually receive. More advanced receivers
  11. Would an absolute timecode based on UTC time be a viable option? Using UTC (Universal Time Coordinated, the worldwide used date/time of day reference) as absolute timecode would allow to operate any device totally independently anywhere in the world while keeping a very precise uniform timecode. With a GNSS-disciplined precision oscillator it would be possible to keep absolute time sync better than +/- 3 milliseconds per day even if the GPS/GLONASS/... satellite signal is lost. With automatic GNSS resync a precision better than +/- 1 ms is easily possible. The drif
  12. I don't know the Switchcraft and Cannon XLR very well, as I'm in Switzerland Neutrik has always been quite popular (Neutrik is in Lichtenstein which is not Switzerland but they share the Swiss Franc, Swiss postal services and many other things, there are no customs nor border controls between those countries). Referring to the female 3-pin XLR cable connector Neutrik NC3FXX-B of the Rode Blimp "Mk II" (with possibly an adapted cable gland as the short cable is very thin) and the Rode NTG3 which features a proprietary integrated male connector design (gold-plated pins in some insulation base,
  13. Thanks for all replies. Interestingly manufacturers don't seem to mention much about how to position a shotgun mic inside a blimp and for the reasons mentioned by dfisk one shouldn't rely too much on published pictures. So basically the overall conclusion would be that the precision of the positioning of he mic inside the blimp is not that critical as it will only have a minor (if any audible?) influence. Overall it's probably more important to carefully route the cable and tighten correctly end caps, sliding lyres and the locking screws in order to prevent handling noise. I've noticed
  14. IIRC in some video (from Rode or Rycote?) it was mentioned that if the lyre covers a few slots it wouldn't be problem (the lyres are narrow anyway). Maybe seasoned experts would be able to notice a very small influence on higher frequencies as a lyre still represents a small obstruction (even if not covering a slot), I don't know. Due to technical limitations, positioning the lyres only on the non-slotted end of the shotgun mic body leads to a weight load difference on the lyres which make longer tubes somewhat dropping toward the front. Also there would be an increased risk that the
  15. Thanks a lot for your answer. I agree that product photos don't necessarily reflect the way they'll be optimally used in real life though in user manuals they should pay more attention to such details. Do I understand correctly that the slotted tube part should be centered referring to "front/rear" of the blimp or rather the whole mic even if the non-slotted part of the cylinder varies depending on the model, also there's the XLR connector which takes some space? Due to possible space restrictions I'm not sure if it's even possible to center the slotted part
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