Phones aren't that big yet. You won't get too many flac files on them. I think my daughter has her new S6 almost full of mp3s already.
I've been wanting to look into RunePlayer on a Beaglebone. Hopefully it would be comparable to the Sonos interface but sound much better. I think that would be an easy addition if someone was looking for added functionality. There's fancy 7" displays to go with them. It's not something I'm going to add on the one I'm building right now but I can look into interfacing hardware for it.
The only time I hear mp3 clicking is a bad conversion, corrupted file during transfer or a read op that had a fifo under-run from slow or non responding mcu.
Have you even tried loss-less wma or flac file sources?
Having a media device reading from a usb stick is a better idea than a cell phone, for me at least. So why does a cell phone/android not have a usb port so you can store/play music files?
The bu9458, has a h/w control mode, so no mcu is needed.
To each there own, that is the beauty of designing your own stuff, you can do whatever pleases you. Coming from a guy who refuses to jump on the cell phone bandwagon.
Have you even tried loss-less wma or flac file sources?
Having a media device reading from a usb stick is a better idea than a cell phone, for me at least. So why does a cell phone/android not have a usb port so you can store/play music files?
The bu9458, has a h/w control mode, so no mcu is needed.
To each there own, that is the beauty of designing your own stuff, you can do whatever pleases you. Coming from a guy who refuses to jump on the cell phone bandwagon.
I listen to flac files all the time. Much better than mp3 but much larger as well.
All cell phones have a usb port. That's how they charge. UE mandated they all use micro USB a few years ago. I'm not sure how apple got around that with their oddball chargers.
All cell phones have a usb port. That's how they charge. UE mandated they all use micro USB a few years ago. I'm not sure how apple got around that with their oddball chargers.
About - RuneAudio If this works anything like Sonos you would never need to plug a device in to play files. It streams over network.
Most PC MP3/FLAC is either full file buffered or >10m buffered. No "clicks" possible.
Better 320K mp3's that you rip yourself or is carefully ripped by the pirates
is nearly indistinguishable from a flac.
I have some of the same discographies in both 320K/flac .... real hard to
tell at low/mid volumes , the dynamics are more "violent" on the flacs at
higher volumes.
My MP3's are read from the HDD ,fully dumped on the DDR3 , and then
read by the codec.
Rsavas .... you a "refusnik" , too 😎 I won't even touch a cell phone ... don't
even like to be near them. Soon you will be mandated to carry one.
OS
Better 320K mp3's that you rip yourself or is carefully ripped by the pirates
is nearly indistinguishable from a flac.
I have some of the same discographies in both 320K/flac .... real hard to
tell at low/mid volumes , the dynamics are more "violent" on the flacs at
higher volumes.
My MP3's are read from the HDD ,fully dumped on the DDR3 , and then
read by the codec.
Rsavas .... you a "refusnik" , too 😎 I won't even touch a cell phone ... don't
even like to be near them. Soon you will be mandated to carry one.
OS
Maybe every file I've listened to in 320k is ripped wrong(quite possible) or they don't work out well with my hearing aids but I can tell the difference when I listen to them back to back even at lower volume levels. The soundstage isn't as wide and the harshness in the highs bugs me. I don't know how to describe it other than clicking.
I couldn't function without my cell phone any more. It saves me running back and forth to the PC all day and I don't need to try to figure out where I left my calculator a hundred times a day any more either.
OS thanks for your input. Using crap downloads/conversions of low bit rate mp3's is no means to de-bunk the use of the technology itself. If they are perfect conversions and Jeff hears something that we do not, I do not know why we do not hear it too.
I think the Rohm BU9458 USB codec is a fantastic device and would sound so much better with an external DAC. It is in the same league as a Si4735 tuner. These devices are so cheap for what you get. Still shaking my head why some one would not include these in a modern day pre-amp design = oh well.
Refusnik for sure, I won't even pay for touch-tone land line telephone service. They will have to support me and pulse dialing. Our Bell idiots still think we should pay a premium on touch-tone service = out of touch with reality.
Back to hockey !!
I think the Rohm BU9458 USB codec is a fantastic device and would sound so much better with an external DAC. It is in the same league as a Si4735 tuner. These devices are so cheap for what you get. Still shaking my head why some one would not include these in a modern day pre-amp design = oh well.
Did you actually make these two file types,320kbps mp3/flac, from the same source (16b/44.1kbps,wav?), using the same software?
Refusnik for sure, I won't even pay for touch-tone land line telephone service. They will have to support me and pulse dialing. Our Bell idiots still think we should pay a premium on touch-tone service = out of touch with reality.
same day I get a cell phone, I'll get the special and add a tracking chip in my anus too, for non-service areas 🙂
Back to hockey !!
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I made most of my 320 MP3's. My encoder allows setting the max volume
digitally. It scans the whole song , sets the highest output as digital max.
Some pirate MP3's are distorted right out of the box (overdriven -"pops")
"Forced stereo" "VBR" suck .... Constant bitrate 320 and true stereo
all the way. Slightly larger file size , but real good SQ.
Most of my FLAC's are pirate bay. Hard to screw up a flac. The ones I've
done personally are compression level 8. Here I can get >20mB files ,
almost as small as 320K mp3's 😎 .
I think all my future "hands on" rips will be compressed FLAC's , we are in
the age of terrabyte HDD's and quad core processors.
PS - I use "CDex" as the ripper. Many built in codecs -but I use my Fraunhofer IIS (not the "lame") and flac 1.3 open source.
Edit - the BU9458 ? Hardware decoder. Is that not in the realm of mobile devices ? For home systems , software decoders
are "king" (update-able , configurable , and verbose).
OS
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BU9458KV-E2 Rohm Semiconductor | BU9458KV-E2CT-ND | DigiKey
Basically, it reads mp3,wma etc files from SD mem card or USB mem stick. Analog dac, spdif or i2s output, h/w or s/w control. You need a 32bit dsp processor, ton of code to do this task or pay the $30 and cheat like I did.
Basically, it reads mp3,wma etc files from SD mem card or USB mem stick. Analog dac, spdif or i2s output, h/w or s/w control. You need a 32bit dsp processor, ton of code to do this task or pay the $30 and cheat like I did.
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My pitchfork implementation
Been playing around with this design a bit. Since I did a lot of the work a few years back when I was designing my A/D pre-amp, it was a matter of copying some of the old design into this new design. Basically it is a pcb in the range of 7.8"x3.8" as it stands.
Here is the incomplete schematic/design and a placed pcb with no routing.
I was thinking to make a dual footprint for opamps, as requested, use all singles instead of duals. I used all TH films cap in the sig paths, 3.3uF PP are large beasts.
The PS I am contemplating where to situate.
I did a quick power cal, once again based on the original A/D pre-amp design and will attach the spreadsheet to look at and use for other design work/modification as req.
So a taste of what my version looks like.
I was also thinking to add extra features to make it a more functional unit and test bed for some other circuits I have in the works to be proto-typed
1) Si4770 super tuner with spdif i/f
2) BU9458 with spdif
3) PCM2902B with spdif
4) Incorporate my U/I (6 bourns encoders and 4x40 blue BLit LCD) and control section from the portable unit, since it is a proven design and would save a ton of time.
I have a fundamental ?
What is the difference in sound quality, if I compare sending audio from the computer using spdif from the sound card vs sending over the USB link to a codec such as pcm2902b or newer "c" version? I mean using the pcm2902b spdif o/p into the same DAC as the spdif rx would be doing?
Okay enough of electronics, got some farming to do at a friends place today 🙂
Enjoy
Rick
Been playing around with this design a bit. Since I did a lot of the work a few years back when I was designing my A/D pre-amp, it was a matter of copying some of the old design into this new design. Basically it is a pcb in the range of 7.8"x3.8" as it stands.
Here is the incomplete schematic/design and a placed pcb with no routing.
I was thinking to make a dual footprint for opamps, as requested, use all singles instead of duals. I used all TH films cap in the sig paths, 3.3uF PP are large beasts.
The PS I am contemplating where to situate.
I did a quick power cal, once again based on the original A/D pre-amp design and will attach the spreadsheet to look at and use for other design work/modification as req.
So a taste of what my version looks like.
I was also thinking to add extra features to make it a more functional unit and test bed for some other circuits I have in the works to be proto-typed
1) Si4770 super tuner with spdif i/f
2) BU9458 with spdif
3) PCM2902B with spdif
4) Incorporate my U/I (6 bourns encoders and 4x40 blue BLit LCD) and control section from the portable unit, since it is a proven design and would save a ton of time.
I have a fundamental ?
What is the difference in sound quality, if I compare sending audio from the computer using spdif from the sound card vs sending over the USB link to a codec such as pcm2902b or newer "c" version? I mean using the pcm2902b spdif o/p into the same DAC as the spdif rx would be doing?
Okay enough of electronics, got some farming to do at a friends place today 🙂
Enjoy
Rick
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It is a interesting problem to solve.
Are you running separate grounds for the WM8805!?
I thought it was best to tie the P/D grounds together locally to the dgnd for this part.
The PLL is in the digital domain.
Right at the bulk caps at the power connectors on your pcb, is not the best way, if the a/d grounds share the same wire back to the PS star ground.
I believe one should tie a/d gnds together at the PS star ground points.
Lets look at the PCM1794A evm!!
Any body else for ideas?
Are you running separate grounds for the WM8805!?
I thought it was best to tie the P/D grounds together locally to the dgnd for this part.
The PLL is in the digital domain.
Right at the bulk caps at the power connectors on your pcb, is not the best way, if the a/d grounds share the same wire back to the PS star ground.
I believe one should tie a/d gnds together at the PS star ground points.
Lets look at the PCM1794A evm!!
Any body else for ideas?
I'm treating PGND on the WM8805 like an analogue ground so I need to bring it to analogue ground as well. I assume it should be a star ground somewhere.
Digital supplies aren't designed yet but I was assuming they would be isolated from analogue completely. I was thinking of joining grounds at the supply caps for the 15V rails for the DAC output buffer hoping they would filter out anything the bead didn't.
Digital supplies aren't designed yet but I was assuming they would be isolated from analogue completely. I was thinking of joining grounds at the supply caps for the 15V rails for the DAC output buffer hoping they would filter out anything the bead didn't.
Wolfson recommends the connection be made right under the DA converter with a wide trace. Cirrus' Eval module is on one ground plane as well.
http://www.cirrus.com/en/pubs/appNote/WAN0129REV1.1.pdf
http://www.cirrus.com/en/pubs/appNote/WAN0129REV1.1.pdf
Assuming a dual secondary trafo or even two separate trafo's , a chassis
star would be the final destination for both the digital and analog 0V.
I do this on my slewmaster / 21'st century - digital/analog "mix". 0V is
clean on my digital board. No false triggering and the ATmega's rail
is quite clean.
The digital ground here is hooked right to the 4 cap returns on the big
star. NO issues. The analog on the pitchfork won't be (decoupling) anything
in the same realm as a 200W power amp !
OS
That makes sense. The extra wire length would help filter it as well.
Do you think this will be okay with remote regulation or should I wait for a shunt design to place near the devices?