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Author Topic: TASCAM DR-100mkIII NEW Unreleased Recorder  (Read 32684 times)

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Offline rogs

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Re: TASCAM DR-100mkIII NEW Unreleased Recorder
« Reply #195 on: March 06, 2018, 09:04:22 PM »
I believe you have to select one of the filter modes  - so there's no option to defeat all filter selections.....
The ADC/DAC chip is the AK4558, and there is quite a lot of detail on all the parameters listed in the data sheet here : https://www.akm.com/akm/en/file/datasheet/AK4558EN.pdf  (including the filter differences on pages 11 thru 15)......
Pretty 'techy' information though....probably easier to try out the different modes, and see if you can detect any difference.....
I've only used the default setting myself so far....

Offline ArchivalAudio

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Re: TASCAM DR-100mkIII NEW Unreleased Recorder
« Reply #196 on: March 07, 2018, 12:30:58 AM »
I believe you have to select one of the filter modes  - so there's no option to defeat all filter selections.....
The ADC/DAC chip is the AK4558, and there is quite a lot of detail on all the parameters listed in the data sheet here : https://www.akm.com/akm/en/file/datasheet/AK4558EN.pdf  (including the filter differences on pages 11 thru 15)......
Pretty 'techy' information though....probably easier to try out the different modes, and see if you can detect any difference.....
I've only used the default setting myself so far....

Oh .... wow - thanks for this pdf... I'll try and decifer and interpet
Also noticing that
Quote
SHORT DELAY2
A SHORT DELAY type digital filter with a slow
roll-off that gently cuts signals outside the
audio band is used.
SHORT DELAY digital filters
These feature tonal qualities that are close to the original
sounds. The starts of sounds and the reverberations are
natural without any pre-echo in the impulse response.
might be the way to go if I understand the bold italic notation correctly.
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Offline DSatz

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Re: TASCAM DR-100mkIII NEW Unreleased Recorder
« Reply #197 on: March 09, 2018, 10:52:09 PM »
There must ALWAYS be some kind of low-pass filtering whenever you convert analog audio to digital. Any significant remnant of signal energy (from whatever source, including noise and distortion) at or above 1/2 the sampling frequency will cause distortion that's potentially quite nasty-sounding, since it's completely unrelated harmonically to the original sound.

In the early days of professional digital audio (ca. 1979) the sampling rate for most of the available recording equipment was fixed at 44.1 kHz, and the filters cut off the high frequencies right at 20 kHz. The entire response "dropoff" (typically 60 dB or greater!) thus occurred in the very narrow range between 20 kHz and 22.05 kHz. This almost absurdly steep cutoff required extremely complex filter circuits, and they were implemented entirely in analog back then. Thus the filters were generally the weakest link in the audio "chain", with limited headroom, impulse response / group delay problems, plus a tendency to drift with temperature and the aging of their components. (Also, they were damned expensive.)

When recording equipment with higher sampling rates came along, for most people serious about audio quality, the main potential advantage was that they allowed the filters to be designed so as to cause less harm to signals at and below 20 kHz. That's what your menu of choices is about, and it may be worth paying some attention to those choices.

In some special applications (e.g. acoustical measurements using miniature models of an architectural space; some sound effects) there is a legitimate need to preserve signals above 20 kHz--but only because in those applications, after the recording has been made, the playback "clock" is slowed down so that those signals drop into the audible range.

--best regards
« Last Edit: March 09, 2018, 10:54:52 PM by DSatz »
music > microphones > a recorder of some sort

Offline Gutbucket

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Re: TASCAM DR-100mkIII NEW Unreleased Recorder
« Reply #198 on: March 13, 2018, 04:30:09 PM »
The practical answer for live music recording is don't worry about it too much.  The default setting is probably your best bet.  What is the default BTW?  FIR1 I assume?

You may well not hear any difference with live music recordings.  Make some test recordings and analyze the results (by listening, and/or on the computer if you have that capability), but make sure your test scenario is exactly the same for all test recordings, as even tiny differences in the recordings are likely to overshadow any subtle differences between filter choices.

If forced to pick one and move on, I'd probably choose a slow roll-off, especially if I was recording at higher sampling rates where even the slow roll off begins well above the audible range.  If recording at 44.1 or 48kHz (which I do), I might compare fast and slow roll off and listen for very slight differences in the very highest frequency content, assuming you have young ears that actually can hear to 15Hkz or beyond, and all else being equal between the test recordings.  Record some jangling keys- a good source of HF and ultrasonic content.  Recording your stereo reduces variables, but may not have enough HF bandwidth for this kind of test.

Without testing, I probably just choose with FIR2.
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Offline ArchivalAudio

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Re: TASCAM DR-100mkIII NEW Unreleased Recorder
« Reply #199 on: March 18, 2018, 04:42:26 PM »
The practical answer for live music recording is don't worry about it too much.  The default setting is probably your best bet.  What is the default BTW?  FIR1 I assume?

Without testing, I probably just choose with FIR2.
Thanks... yes default is choice number 1 or FIR1

I still don't know why I can or want to change these settings. I am not even sure I'd be able to tell the difference at 24/48 (which is my default) nor do I really want to run a series of test recordings to figure it out. However it's and interesting feature.
I obviously would like the most neutral and transparent  or unchanged setting. I have not even tried out the unit yet.
~ Archival Audio ~
Archiving Worthy Music
since 1986 & digitally since 1995

https://www.facebook.com/ArchivalAudio/

Main Mics: Milab VM-44 Links • Milab DC-196's (Matched  Pair)  • Line Audio CM3's
PreAmps:  Naiant LittleBox • Naiant [Milab VM44] TinyBox • Naiant PIPsqueak
Recorders: MixPre 10T • Sony M-10 

macMini 3Ghz i7 16GB Ram 500GB SSD • MOTU UltraLite
Naiant MSH-2's •   TOA K1's • Beyer TG 153c's •  AT 853 (4.7kmod darktrain) • Countryman B3's (1 k mod)  + other assorted mics
==============================
For sale in YS:  • Presonus Firebox •

 

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