Team-BHP - 1-bit vs 24-bit DAC in HU's???

Quote:

Originally Posted by esteem_lover (Post 971570)

With the dolphin ? Which set is that ?

Some Pio HU's had ( do they still have?) dot matrix OEL displays with screensavers of swimming dolphins. :D

Quote:

Originally Posted by esteem_lover (Post 971570)

Lol ! :uncontrol

With the dolphin ? Which set is that ?

It was older series Pioneer HU`s. I don't think it is still there in the newer models..

Quote:

Originally Posted by esteem_lover (Post 971570)

Lol ! :uncontrol

With the dolphin ? Which set is that ?

Quote:

Originally Posted by greenhorn (Post 971576)

Some Pio HU's had ( do they still have?) dot matrix OEL displays with screensavers of swimming dolphins. :D

Quote:

Originally Posted by low_bass_makker (Post 971643)

It was older series Pioneer HU`s. I don't think it is still there in the newer models..

the pio 6850 has the dolphins, the previous version also has the same.:)

Quote:

Originally Posted by greenhorn (Post 971576)

Some Pio HU's had ( do they still have?) dot matrix OEL displays with screensavers of swimming dolphins. :D

Guys, I have seen that. My friend bought one in 2001. My question was,

Did you get the HU with the dolphins as suggested by LBM ?
Which set is that ?

Sorry if I was not clear. :D

If it had been about ADC, then I would have taken one with a higher bit rating.

But the question for the guru's is : Where is DAC used in the HU's ? At the output - when the signal is sent to the speaker ?

Quote:

Originally Posted by condor (Post 971707)

It is used from the CD pickup lens to the pre amp. It is at the very early stage of decoding music.

with all due respect to navinji there is an article on the same thing available on a different forum which also states that since a 1-bit dac has to sample each of the 16-bits separately as compared to the 24-bit which sees it as a whole a certain amount of definition is lost. and i also have found online again, that a 1-bit dac has a signal to noise ratio of about 80-85db. whereas 20 and 24-bit dac's have a much higher snr of close to 120db. so if you think about multisampling and supersampling the latter is faster and as seen by the signal to noise ratio the end quality is better. and since the 24-bit dac's like the burrbrowns and others like the ti pcm 24-bit dac's are pricey they tend to come with better internals. thats the generalisation atleast. tho this is an interesting topic and i would love to see what the other gurus think. will continue research in the field.

Quote:

Originally Posted by kpzen (Post 975057)

Difference between 2.5V pre-out and 5V pre-out in a HU.?

Latter is exactly double of the former?? lol:

Imagine this:

1. There is a stream of water flowing through, between your's and LBM's house.
2. Volume flow rate of stream is 10 liters/ sec
3. You and LBM dump 2 kg each of leftover butter chicken in it per day.
4. Now, assume that the amount you guys are dumping remains the same, but the stream's rate becomes 20 liters/ sec; in terms of percentage of garbage per liter of water, which stream will be less polluted?

Now regard:

- yourself and LBM as the car, chassis and other unfriendly electrical devices
- the stream as the pure audio signal from the head unit's pre-out
- rate of the water's flow as the pre-out voltage
- the butter chicken as the unwanted noise

:uncontrol

Quote:

Originally Posted by Bass&Trouble (Post 975080)

This is the first time I could understand ICE with ease.
All the gurus please answer queries in the same fashion.

Good you chose butter chicken instead of veg curry. :D

Quote:

Originally Posted by Bass&Trouble (Post 975080)

- the butter chicken as the unwanted noise

BT, I owe you a butter chicken on this explanation when you visit BLR next time.

Love the explanation. Too Good cheers:

Quote:

Originally Posted by greenhorn (Post 970549)

they relate to how the analog signal is reconstructed from the digital info. in 24 bit DAC's , each individual sample is created independently, while in a 1 bit DAC, the signal is recontructed by increasing and decreasing the output as required. It decreases the number of steps the DAC can take , but compensates by increasing the number of steps it takes. Thus is solves the problem of non linearity with high resolution DAC's For example , if you had a digital signal like this

Time. 0 5 10 15
Value 0 1 6 10

the output of a 24 bit dac would look exactly as the above values.

a 1 bit dac working at 5 times the speed would look like
time. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Value0 0 0 0 0 1 2 3 4 5 06 06 07 08 09 10

so effectively it takes steps of 1, but faster, instead of the full 24 at one go :)

Hi Just saw this thread and detailed knowledge of T-BHP ICE Gurus.
Just want to Appretiate that and Thank them for sharing it amongst.

Cheers!!