kapvin
Well-Known Member
But this concept is what i already told as option 1.
Its not the option 2, because in the miniamp, the chip has an internal I2S to analog conversion before interfacing it with inbuilt class-D.
okay. I did not see that. I had assumed it was option 2. and there was some writeup about this too, that implied that it was more like option 2. thanks for correcting.
Don't you think that USB2.0 is more attractive, i don't know about how much I2S is popular in home audio.
Sure. But I was talking about 2 parts.
1. the pcm to pwm conversion - and onwards to the output stage
2. and then the front end, which could be spdif, usb, aes.
My point was each of the different kind of inputs you'd need to give would eventually need to be converted to a single protocol which would feed the sample rate convertor and then the pcm to PWM conversion (i guess the digital to pwm conversion would happen at a fixed sample rate, right?) typically this protocol (AFAIK) is i2s.
I was not suggesting an i2s input to the actual amp box (i don't think i2s support long cable lengths), but an i2s input internally which would be interfaced (through a switcher) which would have the various inputs usb/aes etc.. converted to i2s)
from a consumer point of view what I was trying to suggest was exactly as you have described .. a USB input / spdif/ possibly aes.
hope this clarifies what i was trying to say.
also in a situation such as this; the volume control would be digital, and where would it be? Post SRC? (i am assuming that you would upsample before converting to PWM).
please do help correct any misinterpretations