Author Archives: Stephen Dawson

Sony low noise SDXC memory card

Posted on March 8, 2015 by Stephen Dawson

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Posted in Audio, Digital Audio, Mysticism | 1 Comment

‘can theoretically reach 100,000 Hz’

Posted on February 27, 2015 by Stephen Dawson

Here’s something I’d completely forgotten about, or perhaps never known. The ‘Scarlett Book’ for SACD recommended that the high resolution audio be low pass filtered at 50kHz (@-3dB). I was reminded/informed of this by the datasheet for the Cirrus Logic … Continue reading →

Posted in Audio, Codecs, Digital Audio | 2 Comments

Siglent SDG1020 signal generator

Posted on February 13, 2015 by Stephen Dawson

So, here’s another signal generator to compare to those I looked at in ‘Noise and distortion in signal generation’. This is the Siglent SDG1020 , a dual output 20MHz, arbitrary waveform model. It uses 14 bits of resolution apparently. Here’s … Continue reading →

Posted in Digital Audio, Testing | Leave a comment

The Magic of Dither

Posted on February 4, 2015 by Stephen Dawson

(I have written an article for Australian HI-FI suggesting that a good way to start to understand the differences between 16 and 24 bit audio is to listen to the differences between 8 bit and 16 bit audio. To that … Continue reading →

Posted in Codecs, Digital Audio, How Things Work | 1 Comment

You’re never quite sure what you’re going to get

Posted on February 1, 2015 by Stephen Dawson

Last year I reviewed the Western Digital TV Live media box for Sound+Image, along with a bunch of other media boxes, and I gave it high marks, not the least because of its ability to handle high resolution audio. For … Continue reading →

Posted in Audio, Testing | Leave a comment

Noise and distortion in signal generation

Posted on January 31, 2015 by Stephen Dawson

So this is interesting. Apparently, according to the fairly sparse specifications kupbezrecepty.com , the Velleman HPG1 signal generator uses a ten bit DAC, which suggests a fairly high noise floor. I figured I’d measure it to provide this blog with … Continue reading →

Posted in Testing | Leave a comment

Analogue vs Digital signal generation

Posted on January 30, 2015 by Stephen Dawson

In 1997, just starting out on this writing stuff, I decided I needed an audio signal generator. Off-the-shelf ones, to the extent that they were available at all, were way too expensive for me. However back in those days there … Continue reading →

Posted in How Things Work, Testing | 3 Comments

Digital Show and Tell

Posted on August 18, 2014 by Stephen Dawson

Anyone who is interested in understanding any of the nuts and bolts of digital audio will appreciate this video. Anyone who wants to have any kind of informed opinion about how digital audio sounds, its merits and limitations Unnecessary nervous … Continue reading →

Posted in Audio, Codecs | 5 Comments

iTunes for Windows, perhaps the strangest solution ever

Posted on August 17, 2014 by Stephen Dawson

iTunes has been getting increasingly creaky on my Windows 8.1 computer. The first symptom was that after Windows had been running for a while it would fail to refresh my podcasts, even when I manually told it to. ‘[F]or a … Continue reading →

Posted in Misc | Leave a comment

Freeview Plus at last!

Posted on August 7, 2014 by Stephen Dawson

This morning Freeview announced that Freeview Plus is launching on 2 September, or in fewer than four weeks. At last! The main thing it will offer is an enhanced electronic program guide with a search facility but apoteketreceptfritt.com buy levitra … Continue reading →

Posted in DTV | Leave a comment