ADC's and DAC's for audio

ROTFL!!!!

You made my day!!

Jorgen

bit

For a large amount of people it seemed like it. It was also a cost compromise. It was very good (better than FM radio strong signal at 35 to

40 dB S/N) and at an acceptable price. I remember the prices of early CD players (US$250 and up).

is

of

20 bits (about 60 dB) is about the limit of (mass producable) physical transducers and 24 bits (about 72 dB) may be the physical limit of the analog electronics necessary.

Sampling at 44 kHz can leave out of band noise, garbage and artefacts aliased back into the audible range. Sampling at 96 kHz reduces this and sampling at 192 kHz pretty well eliminates it. That is why 192 kHz is the new Pro standard.

--
JosephKK
Gegen dummheit kampfen die Gotter Selbst, vergebens.  
--Schiller

Hi Joseph,

AFAIK 60 dB is about 10 bits (20 * log!) so 16 bit would be 96 dB with 20 bit there are 120 dB reachable. But almost always the analog frontend is not capable to support really 16 bit...

Marte

OK, name one pro video HD camera that runs at 96K let alone 192, they can barely achieve 16 bit CD quality

Nobody in the sound side of the video world uses 192, OK they may upsample to please the client

martin

The video world is full of sluts.

Graham

And what did Hunter S Thompson say about the music biz?

martin

This is the best microphone available with 130dB dynamic range and internal

28bit digitization. It is now widly used in professional recording facilities. If you want to catch the natural reverb in a very quiet space and still have a trumpet or singer close to it, it is the way to go. There are mediums like SACD or AudioDVD which support 24bit/96kHz data. And it can be reproduced authentically with electrostatic headphones. But for Joe Average it is certainly overkill.

--
ciao Ban
Apricale, Italy

Hi Ban,

Great, 130 dB dynamic with S/N Ratio 76 to 87 dB. Guess what you can hear below these 80 dB. Effective these 80 dB is around 14-15 bit. And the rest of these 28 Bit resolution is random noise. So just fill up a few randomized bits and sell it as a 32 bit resolution mic.

Marte

What does that mean, 120 dB dynamic range but only 76 dB s/n? Is the dynamic range a narrowband measurement, or just bogus?

John

The S/N ratio in professional audio is measured at 1Pa SPL, which is 94dBu. The mike is able to record +137dB with 1% distortion. Also the measurements a A-weighted that is the difference between DIN and CCIR. It is a very fine mike and *not* cheap. Sennheiser owns this company.

--
ciao Ban
Apricale, Italy

Do you mean dB SPL ?

Graham

yes

--
ciao Ban
Apricale, Italy

when the signal is -60db the noise is -136

Bye. Jasen

No it isn't. The SNR is referenced to full scale.

Dave :)

Hi Jasen,

hear

you have forgotten to place a smily ;-) Isn't it?

Marte

Ok. why is it called signal to noise if it's not signal to noise?

Bye. Jasen

You are confusing a system level SNR spec with an actual measured SNR value. A system level SNR spec will use a defined signal level which is usually full scale. A system level SNR is effectively telling you what the noise level of the system is, and that noise level does not change, regardless of the signal level. It is *not* saying that the noise will always be -76dB below the signal!

Just think about you are saying. If the product has a SNR of 76dB, and your signal is at say -70dB, do you really think the noise floor would be -146dB?? That is just silly, no system can possibly achieve that.

Given that the noise level of a system does not change, if you have a

-70dB signal in system with a system SNR of 76dB, then your actual measured SNR for that signal is 6dB.

Dave :)

It is difficult to tell exactly what is being measured and how from the referenced data sheet as it mentions no measurement conditions. A signal to noise ratio figure is pointless unless such information is given. It may be referenced to full scale or it may not - they just don't say.

Ian

The datasheet is written for those knowledgeable in A/D specification. It is understood that S/N refers to the maximum obtainable and this obviously occurs at full scale input signal levels- where else. Dynamic range is another performance parameter altogether and is a measure of the relationship between linearity, signal amplitude, and signal frequency, all at a fixed sample rate. Most users are particularly interested in second and third harmonics in a particular range of frequencies as they increase non-linearly with signal amplitude, dynamic range being defined as the maximum S/N at which the harmonic power becomes equal to the noise power.