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Kawai USB to device audio recording
#3010079 08/04/20 02:24 AM
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Hi

Does anyone have any experience - or better still samples they could share - of the recording quality achievable on a Kawai model that has built in USB to device recording? I’m looking in particular at the CN29. How many “bit” does it record at? Is there any unwanted hum/hiss etc? Any input appreciated. Thanks.

Re: Kawai USB to device audio recording
Jonesy038 #3010080 08/04/20 03:02 AM
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Originally Posted by Jonesy038
Does anyone have any experience - or better still samples they could share - of the recording quality achievable on a Kawai model that has built in USB to device recording? I’m looking in particular at the CN29. How many “bit” does it record at? Is there any unwanted hum/hiss etc? Any input appreciated. Thanks.

Please note that the CN29 does not feature a USB to Device port, and therefore does not support recording audio to USB. This feature is available on the CN39 and CA59 and higher models, along with the ES8, MP7SE, and MP11SE slab-type instruments.

Kawai DPs that support this feature allow audio to be recorded in either WAV and MP3 format. The recording specifications are shown in the table below:

[Linked Image]

Please note that some models use a 192kbit/s bitrate for MP3 encoding. Please refer to the instrument's owner's manual to confirm this point.

The recording is full digital, so no hum or hiss is audible (apart from the natural noise that may be present in the original samples). However, you may find that the audio level is a little - this is intentional, in order to prevent clipping. When I use the USB audio recorder, I typically normalise the levels to a fixed level using audio editing software.

Kind regards,
James
x


Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 & occasional rare groove player.

"I agree that the User Manual is very good." - arc7urus, March 2019
Re: Kawai USB to device audio recording
Jonesy038 #3010202 08/04/20 03:31 PM
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Digital recordings are not noise-free. Floating point round-off errors in digital mixers and other DSP algorithms create digital noise.


Login name is a tribute to Jan Pieterszoon Sweelinck.
Re: Kawai USB to device audio recording
Jonesy038 #3010208 08/04/20 04:16 PM
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Just recording digital with fix point number create a noise. Lets say you have a CD quality ADC which only output natural number between 0 and 65535. If a sample is 35.478 the ADC will output 35. You will have a -0.478 noise signal.

Floating point will not add more noise if mantissa is longer than the fix point number. Then a 32 bits floating point will be comparable to a 24bits integer. It will be even better if the amplitude is low. (However, a 24bits resolution will induce a SNR far lower than the analog circuit noise).

However if the quantisation of the ADC add noise, we can the transfer or record the samples without adding noise. With a DP, there are no ADC since samples are already stored in a digital format. We may have a little rounding noise if the volume setting or the key velocity alter the samples which are outputted. But it will be surely less noisy than a DAC conversion and then a ADC conversion.


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Re: Kawai USB to device audio recording
Jonesy038 #3010220 08/04/20 04:49 PM
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Theoretically, the all digital recording will be less noisy. But it depends on the digital implementation and how much DSP is taking place. I have seen it go both ways in practice.

Dithering intenionally introduces random noise to attain other benefits. Some analog noise may actually turn out to behave as a form of self-dithering (eg tape hiss back in the days of analog multi-track tape.


Login name is a tribute to Jan Pieterszoon Sweelinck.
Re: Kawai USB to device audio recording
Jonesy038 #3010267 08/04/20 07:35 PM
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Originally Posted by Sweelinck
Digital recordings are not noise-free.

Sure, but the OP's question was:

Originally Posted by Jonesy038
Is there any unwanted hum/hiss etc?

The digital recording produced by the instrument is of high quality, and will likely sound "noise free" for the vast majority of listeners.

Kind regards,
James
x


Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 & occasional rare groove player.

"I agree that the User Manual is very good." - arc7urus, March 2019

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