Zoom H1 maximum time recording

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almost
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Zoom H1 maximum time recording

Post by almost » Sat Jul 07, 2018 3:11 am

Hi,

I want to connect Zoom H1 to a stereo mixer and record straight out from the DJ's console.
If I hit the Rec button and go, Zoom H1 will record up until the file will get as big as 2 Gb and then automatically will stop and save it?

If yes, what is the minimum recording time that it will record?
If no, how often should I go and hit stop and rec again?

The goal is to have back up audio for weddings receptions, so set it and forget it will be a nice thing.
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Fran Guidry
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Re: Zoom H1 maximum time recording

Post by Fran Guidry » Sat Jul 07, 2018 12:26 pm

You can do a test in advance, simply start recording air and see what happens. But I suspect that you are a video shooter, and as such expect that a 2 GB file captures 20 minutes or so. The fine folks at Sound Devices have provided a calculator that you can use to determine the run length of a given format and size: https://www.sounddevices.com/tech-notes ... lculations

Fran
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Wulfraed
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Re: Zoom H1 maximum time recording

Post by Wulfraed » Sat Jul 07, 2018 1:53 pm

If the intent is to match to video, recommend using WAV 48kHz (the H1 has the worst "manual" of all, it only mentions WAV vs MP3 with no mention of details). 16 or 24 may depend upon planned post processing (24bit gives some headroom to record at a lower level -- try to keep peaks between -12 and -6dB; -12dB is the normal marker in video cameras -- and have data when raising levels in post).

One minute of 24-bit/48kHz stereo is...

48000 samples/second * 60 seconds/minute * 24-bits/sample * 2 samples / 8-bits/byte =>
17280000 bytes/minute

Decimal (1000) vs binary (1024)
17280kB 16875kB
17.28MB 16.48MB

per hour

1036.8MB 988.77MB
1.04GB 0.97GB
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almost
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Re: Zoom H1 maximum time recording

Post by almost » Tue Jul 17, 2018 11:41 am

Thank you Wulfraed for your advice.

So, I hit record and leave.
Came back, and I got 03:06:24 hours of record at 48KHz using 16bit bit/rate that provide me a file of 2.097.056 KB.
After that file, it start recording a new one few secs later with the same specs (no need to press record again).

As I saw on Zoom site all zoom handy recorders have this limitation of 2Gb per file. Is that correct?
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Wulfraed
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Re: Zoom H1 maximum time recording

Post by Wulfraed » Tue Jul 17, 2018 1:58 pm

almost wrote:
Tue Jul 17, 2018 11:41 am
Thank you Wulfraed for your advice.

So, I hit record and leave.
Came back, and I got 03:06:24 hours of record at 48KHz using 16bit bit/rate that provide me a file of 2.097.056 KB.
After that file, it start recording a new one few secs later with the same specs (no need to press record again).

As I saw on Zoom site all zoom handy recorders have this limitation of 2Gb per file. Is that correct?
It's a limitation of the FAT file system used on the SD cards (combined with using signed 32-bit integers -- unsigned integers run 0..4GB but signed runs -2GB..0..+2GB, and obviously negative file sizes don't exist <G>; may also be tied to the development language -- for example, Java* does not even have unsigned integers, and maybe DSP chips don't either if they treat signals as +/-).


* I'm 99 44/100ths % sure Zoom is not using Java for these units, but the chips may still not support unsigned integers.
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Baron Wulfraed
IISS Elusive Unicorn (detached)

Superscope PSD-300; BOSS BR-600, Zoom HD16cd, Zoom R16, BOSS BR-800, Zoom H2n
Now to (re)learn to play an instrument

Lanikai S-C, SMC-E; GoldTone Banjo-Uke; Flatiron 1C, A5; Big Muddy M1-W; Ovation MM68AX, CSE-44; Orpheus Valley Fiesta FS; Taylor NS-72ce, T5-S1; Musima (4st, 20 fret, tenor-tuned) banjo; bongos, dumbeks, bodhrans, hand drum, tambourine; recorder: soprano, alto, tenor; Cedar Flute (5 sizes); Pennywhistle (3 keys); Casio keyboards

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