It should spell Sennheiser, still?
”Even” in America...
https://en-us.sennheiser.com/mkh-microphones
Best,
Stefan
- - -
Citando Augustine Leudar <augustineleu...@gmail.com>:
Thanks Chris -
by multichannel I mean , basically, surround sound. So stereo is two
channels -
but it woiuld be nice to, for example, broadcast 8 or 16 seperate signals
to 8 or 16 seperate speakers each 100 metres apart
.I have used the senheizer in ear montitors to do things like this but you
can only go fifty metres.
I often have to run several km of cables at events to speakers and I would
love not to have to - of course they still need power
but we;ve previously got round this with several low power low noise
portable IP6 rated generators.
I was wondering why Senheizers had a short distance range but good sound
whereas my walkie talkies
could go very far but had crap audio - youve answered the question tx.
On Thu, 30 May 2019 at 17:07, Chris Woolf <ch...@chriswoolf.co.uk> wrote:
Answering this specific question...
On 30/05/2019 10:42, Augustine Leudar wrote:
... I had some walkie talkies that had a
range of one KM with admitedly terrible audio (surely this could be
improved) . Whereas Senheiser in ear monitors have a really short
distance
range of around 40 metres and use much higher electromagnetic frequencies
((863 mhz) . Why is it something cant be done with the same sort of range
as the walkie talkies but for.multichammel audio (according to wikipedia
30 - 400 mhz) ?
Walkie talkies run on a 12.5kHz narrow band, and need ~50kHz of channel
space. Broadcast quality FM (as in radio mics) uses a channel space of
~250kHz. Given than channel "skirts" are quite a bit wider multiple
local channels cannot sit close to each other, and are commonly spaced
~500kHz apart. They also have to avoid numerical frequencies which would
cause intermodulation. Thus remarkably few analogue radio channels can
fit into a single (8MHz) TV channel space. The usual answer is ~12 at
best. Some claim more but range and mutual interference may suffer. With
digital modulation this can improve to ~20 because the effects of
interference are reduced.
Range is directly related to bandwidth, transmission power, and RF
signal-to-noise limitations of the receiver. Narrow band with limited
audio bandwidth and restricted (audio) signal-to-noise is a much easier
task with a couple of AA cells than 20kHz audio with 100dB (companded)
dynamic range. Digital radio mics have been even harder to make that can
modulate something that equates to full broadcast bandwidth and dynamic
range into the the same 250kHz bandwidth as analogue, and with roughly
the same range/battery power.
I've no idea what the .multichannel audio is - can you elaborate? And I
can't imaging that there is any spectrum clear in the 30-400MHz region.
Chris Woolf
www.magikdoor.net[1]
+44(0)7555784775
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