Can you hear a sixty millisecond delay?

Posted on February 4, 2017 by Stephen Dawson

Why, yes you can. The following sound file has two ticks, sixty milliseconds apart. Play it.

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Posted in Audio | 7 Comments

VLC, not quite audiophile

Posted on July 14, 2016 by Stephen Dawson

I’m reviewing the top model phones from three companies for audio performance. For assorted reasons

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, I decided to try out the VLC player on them. The main reason was that

, as is well known, the Apple iPhone doesn’t support high resolution audio. But VLC was alleged to be a free player that would play such files, although there’d be downsampling by the time of the headphone socket. After measuring the iPhone I was startled, so I repeated multiple times, to the same effect. Then I repeated using my Samsung Galaxy S6 phone with VLC installed. Note: I made sure EQ was disabled on the iPhone. The test signal was 24 bit

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Frequency response using VLC

So

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, the Android phone can produce (using the default music player) pretty impressive high resolution output (blue trace). But when played via VLC

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, the output is chopped off a little above 20kHz. And with an iPhone 6S, VLC sends the frequency response all over the place. Weird.

Posted in Audio, Digital Audio, Testing | 1 Comment

H.264 appears on Australian Digital TV

Posted on July 10, 2016 by Stephen Dawson

I’m still accumulating statistics on the rearranged digital TV stations , but stumbled across something rather unexpected. On Prime the ishoptv shopping channel, and the RACING.COM horse racing channel, don’t use MPEG2 video encoding. They’re now H.264, aka MPEG4-AVC (Part 10). Their audio is AAC. Anyone with an old set top box or early digital TV probably can’t receive them.

Looks like I’m going to have to double check the others.

(How do I tell? The Beyonwiz set top boxes don’t report this information. Well

, I record five minutes of each channel and then slurp them up onto my computer and play them back

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, one by one, using VLC. Ctrl-J displays the codecs.)

Posted in DTV, Testing | Leave a comment

At last … 1920 in Canberra

Posted on July 8, 2016 by Stephen Dawson

I’m sure that we’ve all worked out by now that all the TV channels that used to be run by Southern Cross Ten are now being run by WIN TV, and vice versa. A bit confusing

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, but my TVs and set top boxes seemed to sort themselves out reasonably well.

It turns out that there has been at least one positive side effect: the Channels 9HD Canberra and WIN Canberra HD are now broadcasting in full 1920 by 1080i

, after years of their predecessor channels running at 1440 by 1080i.

It’s probably about time that I started gathering data for a new table of bitrates.

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Two new articles

Posted on June 17, 2016 by Stephen Dawson

I’ve put up my DSD vs PCM piece which was published earlier in the year in Australian HI-FI. It’s called ‘Direct Stream Digital and the Power of Imagination’.

I’ve also put up my Australian HI-FI piece on how different bit depths sound

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, and the usefulness of dither. It’s called ‘What Happens When You Reduce Bits?’

Posted in Audio, Digital Audio | 1 Comment

The End of a Mini-era

Posted on February 26, 2016 by Stephen Dawson

Well, it looks like some stats will no longer be available for my Blu-ray reviews. It all depended on a program called BDInfo.exe. And that only worked with AnyDVD decryption running. Now the makers of AnyDVD have pulled the pin. The long arm of the movie industry has reached Slysoft.com (the maker of AnyDVD) in Antigua

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, and they’ve shut up shop permanently.

I discovered this when I stuck Disc 3/4 of Season 5 of The Game of Thrones in the Blu-ray drive and AnyDVD reported it couldn’t contact the AnyDVD server. So no more bitrate graphs or average video or audio bitrates. Fixed audio bitrates I can get using other techniques.

Here’s all that remains of Slysoft’s website:

Due to recent regulatory requirements we have had to cease all activities relating to SlySoft Inc. We wish to thank our loyal customers/clients for their patronage over the years.

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Over-rotating CDs

Posted on February 16, 2016 by Stephen Dawson

Ages ago I mentioned here the Mythbusters episode where they destroyed a CD by spinning it way too fast (23

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Enjoy:

Posted in CD, How Things Work, Testing | 1 Comment

Music-making took — takes — craft

Posted on January 14, 2016 by Stephen Dawson

Toto coverScrolling through the far-too-many albums on my NAS

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, the original self-titled Toto album (1978) caught my eye. It had been a few years since I last played it

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, and supremely experienced largely as session musicians. There can be few debut albums which are as tightly delivered as this. The songs — ‘Georgy Porgy’, ‘Hold the Line’, for example — are of their time, but lifted by their solid construction and the excellence of the performances. But the first stirrings of punk were becoming evident by 1978. The music media were taken by its raw ‘authenticity’

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, now matter how manufactured it was in reality. The listeners nonetheless made Toto a hit, even though the critics were dismissive (Rolling Stone: ‘Toto is the kind of dull debut you’d expect from a bunch of career session players’).

But time lends perspective. A fine review on AllMusic explains contemporary critics’ problems:

It’s as easy to see why radio listeners loved Toto as it is to see why critics hated them. Toto’s rock-studio chops allowed them to play any current pop style at the drop of a hi-hat: one minute prog rock

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, the next hard rock, the next funky R&B. It all sounded great, but it also implied that music-making took craft rather than inspiration and that the musical barriers critics like to erect were arbitrary. Then, too, Toto’s timing couldn’t have been much worse. They rode in during the middle of punk/new wave with its D.I.Y. aesthetic

, and their sheer competence was an affront. [my emphasis]

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Posted in Music | 1 Comment

Was it really that Harrison Ford?

Posted on January 9, 2016 by Stephen Dawson

Recently I reviewed Shock Entertainments Blu-ray release of ‘The Doors’ documentary movie, Feast of Friends for Australian HI-FI. The notes from the film-maker were intriguing:

I hired an old friend , Harrison Ford, to help with the carrying of cases and loading of magazines. He accompanied us to the San Jose concert and then on to Bakersfield for another show. Harrison managed to set up a camera and shoot some footage in San Jose with little, if any, training.

Harrison Ford? How many of them can there be?

Well, according the IMDB, on Feast of Friends Harrison Ford is listed as Cameraman for this movie

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, and has no other credits. So I didn’t bother to mention this possible coincidence in my review.

But here’s the thing: Wikipedia says of him, in the latish 1960s:

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, Ford became a self-taught professional carpenter to support his then-wife and two small sons. While working as a carpenter, he became a stagehand for the popular rock band The Doors.

So it looks like it was him after all.

Posted in Blu-ray, Cinema | Leave a comment

Up to my neck in a Mac

Posted on January 6, 2016 by Stephen Dawson

Apologies for all three of you readers. I’ve been away for so long, from the blog, but not from working. I expect to be doing more here in the future, including loading up some interesting measurement data.

But what prompted me to return was to kind of whinge, and kind of solve a problem. I’m a Windows guy, but in these days of computer audio it’s silly for me not to cover the other major platform, the Mac. So I acquired an entry level Mac Mini, plugged it into a small full HD TV, redeployed my old Apple keyboard originally used with an iPad and added a trackpad. And there you go, a fully working Mac! I can say with confidence that the so-called ease of use of Macs is wildly overstated. It’s difficult to see how one is better than the other

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, especially if you want to stray off the beaten path just a little.

Anyway

, for Music I used a free package called Vox for a while, but then I started reviewing DACs that support Direct Stream Digital streaming and Vox didn’t support this. So after doing some research

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, I decided on Audirvana Plus for the Mac. It has lots of nifty search functions, and can stream DSD, plus PCM up to 384kHz, to any DAC which supports it. The DSD uses the DoP protocols (DSD over PCM — the DSD is disguised as PCM in order to trick the USB circuitry).

But Audirvana Plus also has a cool feature called System Optimizer which gives it priority over a whole bunch of other Mac processes in order to reduced the chances of interruption. I tried to use it but got an error message, and haven’t bothered again for a few months because I was getting clean playback most of the time anyway. Last night, though, I was streaming a couple of 384kbps tracks and DSD128 ones and there were some hiccoughs. So I decided to sort out System Optimizer.

That turned out to require delving into some nasty deep Mac stuff. Ease of use, no. But I’m recording it here, in part in case I ever have to do it again.

So, it was easy to switch on in the Audirvana Plus preferences. When I double clicked on a track to play, the program told me that the Optimizer had to be installed. I said ‘Yes’ and was invited to enter my password, and then a system message appeared:

Audirvana error message

So I find the referred to folder and with the help of Mr Google managed to find out how to change permissions. But these are all rwx, nothing to do with 755. More time with Mr Google revealed a site that explained the relationship. You need to use Terminal and the chmod command. So Terminal it was. A set of cd .. commands to get me back to the root, then cd Library and then ls -l to show the contents of the folder including the permissions. There was PrivilegedHelperTools with root ownership, but in the admin (rather than wheel) group, and with the wrong sequence of r and w and xs:

Permissions 1

So it was just a matter of typing chmod 755 PrivilegedHelperTools. Simple

, huh? Except that permission was refused, even though I am admin for the Mac. I think what was happening was that as this folder is a system folder not even admins can fool with it. But Mr Google helped some more. It turns out that you can force commands to happen by proclaiming yourself to be a super user. Instead of chmod 755 PrivilegedHelperTools I needed to type sudo chmod 755 PrivilegedHelperTools. I’d have to type in my password to confirm. This was accepted and the permissions were correctly set:

Permissions 2

But I also had to change the group from admin to wheel (this had probably been changed when I’d been trying to fiddle with the permissions in Finder) so: sudo chown root:wheel PrivilegedHelperTools and everything was finally right:

Permissions 3

I fired up Audirvana Plus again, switched on the System Optimizer and started playing a track. It asked for permission to install, which it did without demur and the music started playing with the SysOpt indicator showing.

So, there, Macs really are easy to use, aren’t they!

Posted in Audio, Computer, Digital Audio | 7 Comments