Recording Times - Nagra Seven Operating Instructions Manual

ANNEX II
Recording durations of audio files on the Nagra
sampling frequency selected for the recording. Below is a small table indicating the recording times available
on the internal Micro SD card, as well as on a 4GB removable SD card, from which you can calculate the
respective times for any other card sizes.
The internal 16 GB Micro SD card will allow the following recording times in PCM linear:
S.Freq 44.1 kHz
Bits 16
2 tracks 25h03m
An External 4 GB SD flash card will give:
S.Freq 44.1 kHz
Bits 16
2 tracks 6h12m
DATA TRANSFER RATES
File transfers in the digital domain are of critical importance, and the time taken to make such transfers can be
a fairly costly matter. Many factors influence the transfer speed of digital material from one media to another
so it is very difficult to accurately predict exact times.
It is not sufficient to say "USB-2" and assume that the transfer will be made at 480 Mbits/second because this
will not be the case. The speed is governed by three principal factors, the speed which the source device can
supply the data, and the speed that the receptor can accept the data and the USB link speed between the two
devices.
In recent tests the Nagra
computer at a rate of approximately 7.5 Mbytes per second. This means that the transfer of 1GB of data will
take approximately 2 minutes 15 seconds. This means that 1 hour of stereo 2 channels 48 kHz will transfer at
approximately 25 times faster than real time. The type of file will not make any difference to the transfer
speed.
ANNEX II
Seven
48 kHz
24 16
16h42m 23h01m
48 Khz
24 16
4h08m 5h42m
Seven transfers data either through USB-2 or from the internal micro SD to the

RECORDING TIMES

depend on different criteria such as bit depth and
96 kHz
24 16
15h20m 11h30m
96 Khz
24 16
3h48m 2h51m 1h54m
100
192 kHz
24 16
7h40m 5h45m 3h50m
192 kHz
24 16
1h25m
September 2013
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