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1
Audio Hardware / Re: Griffin iMic or similar hardware for recording from tape
Last post by AndyH-ha -
If you are recording from any kind of tape player you DO NOT want to use a microphone-in connection on the ADC. Only a straight line in, or one with an analogue front end containing an analogue level control, has a chance of reasonably capturing the best signal.

There are no other significant considerations for the ADC (anything but the cheapest junk will do a good job) but there can be a number of complications/requirements for the tape playback device. These days, however, just finding something that will play tape at all can be enough of a challenge.
2
FLAC / Re: SACD to FLAC
Last post by bmcelvan -
No dice but thanks for idea. I can't remember if command prompt has a mode to write everything to a text file. I know for Lame, FLAC and robocopy for example, the .exe file itself has a "logging" option.

I noticed that if you just run it silent, then errors are quite obvious - so I'll do that I guess.
3
Scientific Discussion / Re: Objective evaluation of SBC and aptX codecs using music-based audio metric
Last post by Serge Smirnoff -
Well the main problem of your test setting is that it's not "objective" as you think.
Objective in my post means measurable (not subjective).
Quote
A bigger difference in wave forms doesn't necesserily mean that the difference to the original sound file is more audible. So aptX and SBC(loudness) may look similar in your analysis but one might outperform the other in listening tests.
Your "doesn't necessarily" is correct. It means that in some cases the relation holds, in some - doesn't. And this is the subject of my main research - to discover in what cases bigger (measurable) differences in waveforms necessarily lead to their better audibility, and in what cases such relation is absent. Proposed method of artifacts' comparison aimed at discovering such useful cases when the size of differences in waveforms correlate well to results of listening tests.

At this stage of the research I use the following selection criteria for the useful cases: if distances between artifact signatures are less than 0.3 within a group of devices under test, then their perceived sound quality can be judged by the size of their waveform differences.

The above criteria I used in this small SBC/aptX research.
4
Support - (fb2k) / Can't access music on an Android phone from PC.
Last post by TheAlmightyGuru -
Since dedicated digital audio players seem to be going extinct, I'm trying to transition from my old MP3 player to using my phone as my primary portable music player. I've been holding off for years because I couldn't find a decent jukebox program for Android, but since foobar2000 mobile has been released, I've been transferring to it. I've been using foobar2000 desktop for years, and all my music has been optimized for it, so this has been a fairly painless process.

However, one thing I loved with my old MP3 player is that, when I sit at my desk, I can plug my MP3 player in to my PC and still have all my music at my fingertips through foobar2000 desktop. This is great because I only have to maintain a single collection of music where ever I go. Unfortunately, a problem has arisen now that I've switched to my Android phone. My old MP3 player used MSC which gave foobar2000 desktop full read/write access to all the files, but my phone uses MTP which is far more limited.

My question is, is there anything I can do, either to my Android phone, Windows, or foobar2000 that will give foobar2000 desktop full access to all the music files on my phone (play the music, alter the meta tags, change album art, etc.) or is this just another one of the constraints of using Android?

Thanks!
5
FLAC / Re: SACD to FLAC
Last post by blurry_light -
Last question: Is there a way to get sox to create a log file so I can check for errors later in case I accidentally hit a key and close the batch script...for example when waking the computer from a screen saver if I walk away after a big batch.

I tried adding > log.txt but that yielded and empty text file and I couldn't find any options in the Sox command line help section.

Try adding ">> output.txt", with two > symbols, at the end of the main loop of the script.

So, for example (here we let SoX dither, as explained before)

Code: [Select]
for %%a in ("YourInputFolderHere\*.dsf") do sox -V3 -S "%%a" -b 16 "YourOutputFolderHere\%%~na.flac" rate -v 44100 >> output.txt
pause
6
Opus / Re: Can anyone reliably ABX OPUS at 160kbps?
Last post by jmvalin -
Opus - finally bringing you the glorious stupidity of real CBR!
*ducking*

Actually, this made me google for why there is a CBR mode (except for testing purposes). I found this by @polemon - is that it?
CBR is useful because not every transport mechanisms can take VBR/CVBR, especially for real-time. Keep in mind that people use Opus for a whole lot of applications that have nothing to do with files. For example, if you want to play live music across a network, you need minimal latency, which means you probably want to use the highest bitrate that'll go through without causing delay, but not a single byte more. Then there's people using Opus in real-time over a fixed-bandwidth wireless link (e.g. DECT, possibly Bluetooth too). You'd be surprised to see all the places Opus ends up in.
8
Audio Hardware / Re: Designing a good listening test
Last post by ajinfla -
please help me design a good listening test
If one was a undercover guerilla peddler of audio jewelry, one might suggest something like this: http://www.diyaudio.com/forums/solid-state/194882-double-blind-auditions-thread-6.html#post2679256 rather than a mentally taxing ABX.
Thereby making it impossible for the average Joe, so that casual sighted listening is reverted to as the more attenable possibility in a convoluted false equivalency.
Oh wait, did you say no instant switch? Maybe a dart board and darts?
Or there is always a good fishing rod.
9
Audio Hardware / Re: Designing a good listening test
Last post by DVDdoug -
How "scientific"?

See ABX test.  That's the ideal.  

For a casual non-blind A/B test, do your best to level-match.   If you have a multimeter to measure the amplifier output voltage into the speakers, that's ideal.   Or, you can use an SPL meter.   Otherwise you can set-up a laptop, or a phone with a recording application or anything that has a meter.   The voltage or SPL level isn't important as long as both amplifiers are level-matched.  If you measure acoustically, use a lower frequency for more-reliable more-consistent readings.     I was doing some high frequency measurements (~8kHz) awhile back, and just walking around behind the SPL meter changed the readings.  Audacity can generate test-tones for level matching. 

Of course, make sure tone-controls/EQ are set to flat.    With the AVR, you'll have to make sure any automatic room-adjustment or subwoofer crossover disabled.

If you want to approximate a blind ABX test, you'll need to randomize the selections (flip  a coin) and you should disconnect & re-connect the speakers even when comparing "A" to "A".     With most amplifiers you can connect/disconnect the speakers with power-on, but it's a good idea to do it with no signal and be careful not to short-out the connections.   If you can rig-up some kind of speaker connectors that you can easily un-plug and plug-in, that's better than switching wires to binding posts, especially with "live" connections. 

Get some Y-Adapters so you can feed the signal into both amps continuously without switching.

Since it won't be a double-blind it's best if the person doing the switching is hidden from sight along with the amplifiers.

There might be a pop/click when you connect the speakers and that could be a give-away and if you turn the equipment on/off there could also be give-away clicks or thumps, etc.

Quote
There will be no instant switching unfortunately.
It's easier to hear a difference with instant switching, but in the real world you wouldn't be switching amplifiers that fast.


10
3rd Party Plugins - (fb2k) / Re: iPod manager
Last post by TheEmpathicEar -
You could add an album remapping that checks if the album is 'Greatest Hits' and then appends the album artist if so. I'm not sure you're going to get much better than that.
What do you think about @anamorphic 's idea of Zero Width Space ? Maybe a conditional of some sort when a situation like mine with two albums with the same name in the same year? I already am using a mapping the displays my albums with the year in brackets: '[2004]'
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