1-bit vs 24-bit DAC in HU's??? - Page 2 - Team-BHP

greenhorn · 10th September 2008, 11:19

Quote:

Originally Posted by esteem_lover

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.

low_bass_makker · 10th September 2008, 11:51

Quote:

Originally Posted by esteem_lover

Lol !

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..

rider60 · 10th September 2008, 12:01

Quote:

Originally Posted by esteem_lover

Lol !

With the dolphin ? Which set is that ?

Quote:

Originally Posted by greenhorn

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

Quote:

Originally Posted by low_bass_makker

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.

esteem_lover · 10th September 2008, 12:22

Quote:

Originally Posted by greenhorn

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

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.

condor · 10th September 2008, 12:32

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 ?

low_bass_makker · 10th September 2008, 13:20

Quote:

Originally Posted by condor

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 ?

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

greenhorn · 10th September 2008, 13:43

CD transport -> Decoder-> DSP-> DAC-> Preamp-> Power amp->Crossover-> speakers

*not comprehensive

valhallen.282 · 12th September 2008, 16:35

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.

kpzen · 12th September 2008, 18:19

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

Bass&Trouble · 12th September 2008, 18:31

Quote:

Originally Posted by kpzen

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

Latter is exactly double of the former??

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

PatienceWins · 12th September 2008, 18:36

Quote:

Originally Posted by Bass&Trouble

Latter is exactly double of the former??

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

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.

lambuhere1 · 12th September 2008, 18:54

Quote:

Originally Posted by Bass&Trouble

- 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

low_bass_makker · 12th September 2008, 19:11

Oye my Butter chicken is getting popular. But where is the omelette.

kpzen · 12th September 2008, 23:11

Holy S$%&%!! U made a mockery of my badly put up query.!
Thanks Ajay for the wonderful explanation. Never understood ICE better.

10th September 2008, 12:32	#20 (permalink)
condor Senior - BHPian Join Date: Jun 2006 Location: BLR Posts: 1,958 View My Garage	D A C & A D C 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 ? __________________ Life is Analog. Digital is an approximation. ACHTUNG : Anyone travelling Lufthansa SFO-Frankfurt-BLR on 7-Dec-08 ? Pls PM me Last edited by condor : 10th September 2008 at 12:48.

10th September 2008, 13:43	#22 (permalink)
greenhorn Senior - BHPian Join Date: Apr 2007 Location: Trivandrum Posts: 1,622 View My Garage	CD transport -> Decoder-> DSP-> DAC-> Preamp-> Power amp->Crossover-> speakers not comprehensive __________________ 2007 Indica DLG My next* Truck will be a Safari!

12th September 2008, 18:19	#24 (permalink)
kpzen Senior - BHPian Join Date: Oct 2004 Location: Greater Noida Posts: 3,533 View My Garage	One more doubt!! Difference between 2.5V pre-out and 5V pre-out in a HU.? __________________ Prajesh

12th September 2008, 23:11	#29 (permalink)
kpzen Senior - BHPian Join Date: Oct 2004 Location: Greater Noida Posts: 3,533 View My Garage	Holy S$%&%!! U made a mockery of my badly put up query.! Thanks Ajay for the wonderful explanation. Never understood ICE better. __________________ Prajesh Last edited by kpzen : 12th September 2008 at 23:13.

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12th September 2008, 16:35	#23 (permalink)
valhallen.282 BHPian Join Date: Aug 2008 Location: Bangalore Posts: 76	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.

12th September 2008, 19:11	#28 (permalink)
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 6,042 View My Garage	Oye my Butter chicken is getting popular. But where is the omelette.