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Author Topic: Tascam DR-05 "Low Cut" filter  (Read 860 times)

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Offline gltape

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Tascam DR-05 "Low Cut" filter
« on: December 17, 2016, 11:08:01 AM »
Hello,

my Tascam DR-05 "Low Cut" filter can be set to 40Hz, 80Hz, or 120Hz in order to reduce noise such as offensive wind noise from air-conditioners and projectors.

The frequencies discarded will be comprised between zero and one of the three above values in Hz, for example between 0 Hz and 120 Hz ?

Thanks

Offline morst

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Re: Tascam DR-05 "Low Cut" filter
« Reply #1 on: December 19, 2016, 09:02:50 PM »
typically, low cut (high pass) filters roll off a particular number of dB of signal per octave, like -6db/octave or -12dB/octave.

I looked at the web and didn't easily find how steep the DR-05 filter is, but let's just pick a -12dB filter  for example.

If the roll-off starts at 40Hz, then at 20Hz it will be down -12dB, at 10Hz it will be down -24dB at 5Hz it will be down -36dB.

Now let's use the same filter slope, but pick the highest roll-off frequency you have available: 120Hz

at 120Hz there is no change. At 60Hz signal is down -12dB. At 30Hz, signal is down -24dB. At 15Hz, signal is down -36dB.

Like that. Make sense? Check out the chart on wikipedia for a Mackie with a High-Pass filter at 75Hz, which has a slope of -18dB/octave
https://en.wikipedia.org/wiki/High-pass_filter

 

OH HEY if you're asking for musical advice, I say LEAVE IT OFF! Do not use low-cut filters on music!

If you have a wind noise issue, use windscreens. If things sound too bass-y, edit them later.

I joked to a taper-buddy just the other night, that the low-cut function is the NO BASS function!
« Last Edit: December 19, 2016, 09:04:59 PM by morst »
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Offline DSatz

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Re: Tascam DR-05 "Low Cut" filter
« Reply #2 on: December 19, 2016, 11:41:54 PM »
Actually, when a frequency is given for a filter, that frequency represents the "half-power" (-3 dB) point, and if it's a low-cut filter, there will also be some reduction (though less than 3 dB) at frequencies just above that frequency.

So a 120 Hz low-cut filter is 3 dB down at 120 Hz, and depending on its design it may well be 1 or 2 dB down at 150 - 160 Hz, and even a little bit at 200 - 250 Hz. It all depends on the design of the filter.

--best regards
« Last Edit: December 19, 2016, 11:46:20 PM by DSatz »
music > microphones > a recorder of some sort

Offline morst

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Re: Tascam DR-05 "Low Cut" filter
« Reply #3 on: December 20, 2016, 04:13:45 PM »
Actually, when a frequency is given for a filter, that frequency represents the "half-power" (-3 dB) point, and if it's a low-cut filter, there will also be some reduction (though less than 3 dB) at frequencies just above that frequency.

So a 120 Hz low-cut filter is 3 dB down at 120 Hz, and depending on its design it may well be 1 or 2 dB down at 150 - 160 Hz, and even a little bit at 200 - 250 Hz. It all depends on the design of the filter.

--best regards

AHA! I was questioning myself after seeing that Mackie chart, where the 75Hz looked about -3 dB down.


(bigger view:

)

DSatz with the facts!
« Last Edit: December 20, 2016, 04:15:31 PM by morst »
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