Caiman and Laptop

[Marktdac]

Hello again ,i have a couple of questions about my caimen and laptop.

As i now mostly listen to music via my laptop caimen and headphones connected via Usb , i was wondering if i got a laptop with an SPDIF output would i get better sound ?

Also whats all this 16 bit 24 bit 32 44.1 48 KHz stuff actually mean

And finally i see u can get an adaptor to convert a 3.5mm headphone socket to Spdif ,is this way of doing it any good? ,would it give better results than Usb and would it give the same results as a dedicated Spdif socket?

Another thing before i forget! i am useing foobar2000 i take it when i use Usb i select 16 bit ,if i was useing spdif or toslink id select 24bit?

Many thanks Mark

[Marco]

Hi Mark,

Just a quick one....

Could you do me a favour and add your basic geographic location details to your profile?

Cheers!

Marco.

[technobear]

As i now mostly listen to music via my laptop caimen and headphones connected via Usb , i was wondering if i got a laptop with an SPDIF output would i get better sound ?

Not necessarily. The digital outputs from laptops are often not that great. They can be noisy and jittery.

A better bet is to get one of the newer DACs with asynchronous USB.

Also whats all this 16 bit 24 bit 32 44.1 48 KHz stuff actually mean

The 16 and 24 are bits per sample. CDs have 16 bits per sample. DVDs have 16 or 24. Some hgih-res downloads are available with 24.

44.1, 48, 96, etc is the sample rate or number of samples per second (in thousands). CD is 44.1. DVD and TV are 48. Some DVDs have 96 as do some high-res downloads.

And finally i see u can get an adaptor to convert a 3.5mm headphone socket to Spdif ,is this way of doing it any good? ,would it give better results than Usb and would it give the same results as a dedicated Spdif socket?

Only if the laptop has a dual headphone/spdif socket. The spdif bit is an optical transmitter at the end of the socket I think.

Another thing before i forget! i am useing foobar2000 i take it when i use Usb i select 16 bit ,if i was useing spdif or toslink id select 24bit?

Depends on the source media. Read this: http://www.rightnote.co.uk/pdfs/dcs_...uter_audio.pdf

[Welder]

Hello Marktdac

Laptops with SPDIF are relatively rare.
This may help you out with regard to which connection sounds best with your caimen.
http://www.headfonia.com/beresford-tc-7520-review/
I’m sure others here will have a different perspective.

This may go some way to answering your questions concerning bit rate and frequency. It’s worth book marking this site.
http://www.thewelltemperedcomputer.com/HW/USB_DAC.htm
Otherwise a simple net search should answer in detail.

I personally wouldn’t recommend using 3.5 jack to SPDIF converters and would recommend sticking to USB throughout.

There has been a lot of discussion concerning SPDIF v USB for audio in Hi Fi circles.
Generally most people believe USB is equal to if not better than SPDIF.
For laptop source applications USB has definite advantages.
Adding 8 bits to 16 bit sound files is unlikely to do any harm and may even give you a bit more headroom for noise. I use 24 bit replay for some 16 bit files in foobar2000 and ASIO4all. I can’t hear any difference.

[Vincent Kars]

Hello Marktdac

Laptops with SPDIF are relatively rare.

Adding 8 bits to 16 bit sound files is unlikely to do any harm and may even give you a bit more headroom for noise. I use 24 bit replay for some 16 bit files in foobar2000 and ASIO4all. I can’t hear any difference.

SPDIF
I thought so too but a lot of multi media models do have a SPDIF out.

24
There is even a slight advantage playing 16 bits at 24.
You can use digital volume control and chop of 8x6=48 dB without loss of resolution

[dave2010]

SPDIF
24
There is even a slight advantage playing 16 bits at 24.
You can use digital volume control and chop of 8x6=48 dB without loss of resolution

Doesn't that depend on how the digital volume control works?
If it's an integer one, simply multiplying/dividing by 2, then the control will be in steps of about 3db/6dB (voltage/power), but do they all work that way? Some might use a more continuous approach, multiplying by different factors, or even using floating point arithmetic.

There could be a very slight loss in multiplying/dividing by factors other than integral powers of 2.

I write out of ignorance here - as I don't know what goes on in all volume controls in all the kit available.

[Vincent Kars]

I write out of ignorance here - as I don't know what goes on in all volume controls in all the kit available.

Me too.
Cmedia had some nice audio drivers, working in 14 bits mode!

If we assume 24 bit integer, the quantization error is in the LSB, 24x6=-144 dbfs down so ways below the noise floor.
The good ones probably use float and dither the result
But indeed I don't know them all.
It is probably very much like analogue volume control, you have good and bad implementations

[Marktdac]

Ok thanks Tecnobear ,Welder ,marco have done that.As i type i am listening to foobar at the bottom it says 44100hz and it sets to 16 bit in the settings ,so in theory that should be same as as a cd , but its an mp3 download at 296 kbps {which for some reason is going up and down} so how come then a higer bit rate also effects sound ?

Another thing is how can one of those Spdif convertors convert back to a digital format? THe music comeing out of a headphone socket has already been processed to a form the human brain understands {music }so surley it would have to convert it back to digital so the dac can do its stuff? or isnt SpDif a digital output

[technobear]

Ok thanks Tecnobear ,Welder ,marco have done that.As i type i am listening to foobar at the bottom it says 44100hz and it sets to 16 bit in the settings ,so in theory that should be same as as a cd , but its an mp3 download at 296 kbps {which for some reason is going up and down} so how come then a higer bit rate also effects sound ?

Another thing is how can one of those Spdif convertors convert back to a digital format? THe music comeing out of a headphone socket has already been processed to a form the human brain understands {music }so surley it would have to convert it back to digital so the dac can do its stuff? or isnt SpDif a digital output

What you have there is a variable bit rate MP3

Foobar will decompress it to 16/44.1 because your DAC does not understand MP3.

FYI, CDs have a bitrate of about 1400 kbps (vs 320 for the best MP3s).

The SPDIF converter you mention is simply a plug adaptor (3.5mm to TOSLINK). It doesn't convert anything. The SPDIF has to be in the socket already. Not many laptops have this.

[Reid Malenfant]

FYI, CDs have a bitrate of about 1400 kbps (vs 320 for the best MP3s).

Apologies for the slight drift here, but isn't most of the CDs 1400 Kbps data made up of error correcting data in case the laser misses data? From what i have read there is error correction data before & after the "real" data to be read so if things go amiss there shouldn't be any mistake