I've still not determined the self noise, I'll do it in the next days. I've
used the best components on the market just to keep the noise at minimum.
The ADC is 16 bit 500 kHz and there isn't a 24 ADC with this sampling rate.
However oversampling could be used to increase the bits. But a
consideration must be done:16 bit is quite enought for a microphone input,
usually a good low noise design of analogic conditioning in a 16 bit device
gives better result than many 24 bit recorders.
Oversampling can be used to improve the SNR even if at 16 bits
Ivano
Il 03/set/2016 01:44, "Dan Dugan [naturerecordists]" <
> ha scritto:
>
>
> What is the self-noise in the audio band?
>
> -Dan
>
> On Sep 2, 2016, at 6:01 AM, [naturerecordists] <
> > wrote:
>
>
>
> Hi all,
>
>
> After a long developing period, my friends and I have developed
> Ultramic384k a new microphone / recorder that can accept a differential
> input signal.
>
> This device is intended for wildlife applications.
>
>
> At the moment only a part of the software is completed, the roadmap is
> complex and I'd like to know the opinion of on field users to understand
> the needs for specific application and possible improvements.
>
>
> Here some characteristics:
>
>
> - 384 khz sampling rate 16 bit (500KHz when recording directly on SD card=
)
>
> - differential analogic input.
>
> - completely waterproof (all the components are IP68 even if it's not goo=
d
> to submerge the microphone in water)
>
> - detachable sensor. In this way it possible to connect every possible
> sensor: infrasonic, ultrasonic, audio, hydrophone, vibration etc
>
> - the connector for the sensor is 6 pole with the following pins:
>
> * ground,
>
> * 5V,
>
> * digital in digital out(RS232 or I2C),
>
> * differential analogic input
>
> - only 29 mA at full power
>
>
> The roadmap has the following steps:
>
> - composite USB class (this is the way to see with a single usb connectio=
n
> both the USB microphone AND the mass storage device, it's no more necessa=
ry
> to open the microphone to access the SD card)
>
> - autonomous recorder with xml configuration file
>
> - selectable sampling rate (at the moment it is fixed to 384khz)
>
> - Infrasonic microphone
>
> - Hydrophone with specific preamplifier
>
>
> The reason of my post is to have informations by users about how to
> proceed and if is there some specific request and things to consider for =
on
> field use.
>
>
> Here the link of Ultramic384k with the preliminary informations:
>
>
> http://goo.gl/FsxUvV
>
>
> Thanks
>
> Ivano Pelicella
>
>
> Dodotronic
>
>
>
>
>
>
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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