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usb to rca or coaxial - Page 5

post #61 of 66
Thread Starter 
Quote:
Originally Posted by billybob_jcv View Post

In the same way that after connecting an external DAC to your PC, you can still use Windows volume control to raise/lower the volume. It is just multiplying all the PCM data points by a gain factor. When the bits are put back together into a sine wave, the amplitude of the wave is greater, thus the volume is louder.

 

I can confirm that in my setup, the data received by the Marantz is PCM.

From what you are saying, does it imply that my android is sending processed data (data * gain) to the marantz dac ?

 

If it is so, if my android (or any other usb audio source) is not a good processor. Like if the data * gain is not properly calculated or the gain differs along the entire data stream (for any reasons may be). This will affect the overall quality of the music... right ?

 

And i do not get the idea of using a sine wave to represent the digital signal (which only contains 1's and 0's). A square wave must be a better representation for this data... right ?

post #62 of 66
Thread Starter 
Quote:
Originally Posted by kramer5150 View Post
 

Also i have a doubt here, when i connect my phone through usb audio out to marantz dac, my phone is actually sending 1's and 0's... right ?

>Correct.  To the best of my knowledge USB is a digital ONLY standard for data transmission.  It does not send or receive analog AC.  Obviously it does have DC power too.

 

So how am i able to control the volume through my phone ?

>The music player on your phone should have a way to reduce volume.

 

Is there something like amplification in digital audio ?

I don't think so.  You can attenuate the signal (IE turn it down)... but not boost it.

 

Cool deal, I am glad you got it to work out.  My brother in law just gave me an older-generation Samsung net-book. I am trying to merge it into my existing DAC/Amp setup so I can listen to www radio streams.  I am considering that little converter board.  My delima is whether to go with wireless APTx convenience or a wired lossless solution.  Leaning towards the former, since www radio is compressed anyways.

 

I do not know what all options do you have in the market.

In my case the options were limited with 2

First being about the board i bought.

And second being the wireless.

 

There was a considerable difference in price of both the options. The second (good quality branded product) was about 5 times costlier than the First.

So that was a major reason for me for buying the wired board. But for the price of 15-20 usd i am completely satisfied with the build quality and performance of the board.

 

Also my older android did not support usb audio natively but supported the wireless (DLNA i guess), Though i got it to work using custom android rom, You must confirm if the netbook supports usb audio and/or the APTx.

 

And do not make the same mistake that i did by buying the wrong cable (usb 3.0 type B instead of usb 2.0 type B)

post #63 of 66

Thanks for the warning on the cables, I would never have thought about that.  I always thought they're all the same.

post #64 of 66
The sine wave I am talking about is the analog signal AFTER the DAC. The DAC has to reconstruct the analog music signal from the bitstream.

I suppose it's possible that multiplying the PCM signal by a gain factor could affect the resulting sound - I really don't know. I'm not really understanding what your concern really is. I suspect you are worrying about the wrong things. Whatever headphones you are using is affecting your sound much more than any of this nonsense you are worried about.
post #65 of 66
Thread Starter 
Quote:
Originally Posted by billybob_jcv View Post

The sine wave I am talking about is the analog signal AFTER the DAC. The DAC has to reconstruct the analog music signal from the bitstream.

I suppose it's possible that multiplying the PCM signal by a gain factor could affect the resulting sound - I really don't know. I'm not really understanding what your concern really is. I suspect you are worrying about the wrong things. Whatever headphones you are using is affecting your sound much more than any of this nonsense you are worried about.

 

I am not woried about anything right now, My entire system is up and performing just well; was just giving it a thought for clarification.

 

Right now what i believe is that the Android sends bitstream (1's and 0's) through usb in a square wave. The PCB that i bought gets that as input and gives me digital out through coaxial (again 1's and 0's as square wave) which is given to the internal DAC of marantz through coaxial input. Now here digital to analog conversion takes place (bitstream to sine wave) and it gets forwarded to the amplifier.

 

So now, in such a environment, i can think of only 2 cases in which the volume can be controlled by the android.

1. The marantz DAC also considers the amplitude of input (square) wave and thus the square wave(bitstream) generated by the android changes the amplitude of the wave depending upon the current volume level.

2. It does not consider the amplitude. So in this case along with the bitstream the android has to send the volume level (gain factor) to the DAC so that the volume may be adjusted acordingly.

 

I would like to get a clear understanding of this part of which among the above is true.

post #66 of 66
Thread Starter 
Quote:
Originally Posted by kramer5150 View Post
 

Thanks for the warning on the cables, I would never have thought about that.  I always thought they're all the same.

 

The A male and A Female are the same in usb 2.0 and 3.0 but not the other two. The usb 2.0 type B male socket fits right into the usb 3.0 type B female socket but not via versa. In my case the board had usb 2.0 type B female port and i bought the usb 3.0 type B male connector cable initially. So i had to buy the usb 2.0 type B cable.

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