Category: sci-tech


The sound of Mars Express

A French amateur radio operator was able to record and convert the signal of the Mar Express probe’s X-Band transmitter into an audio file. More information plus a sample of the recorded sound is available from here.

The equipment from an abandoned telecom uplink site used to listen in on the ESA’s Mars Express space probe wasn’t enough to allow download of the actual data.

“Listen here to the whistle of Mars Express as it hurtles towards Phobos and consider that this signal was generated on Mars Express by a transmitter only slightly more powerful than a light bulb.” – http://webservices.esa.int/blog/post/7/1058

Lip reading mobile phones

Some intersting potential for a new midi controller could be possible after some reseach and development carried out by the Karlsruhe Institute of Technology into creating mobile technology which reads the users lips. A development of this could be to create a midi expression interface?

Current applications highlighted are communication in silent environments or where the phone user may disrupt other users and the transmission of confidnetial or sensitive information – not to mention “having a quiet word” in public.

A post from Cellular News covering the story.

A link to Karlsruher Institut für Technologie

Weaponizing Mozart

A little off topic but can’t resist this post from http://www.sott.net/ – on the use of classical music to scare away youth culture

Apparently, “the most successful deterrent music”, in one area “included the Pastoral Symphony by Beethoven, Symphony No. 2 by Rachmaninov, and Piano Concerto No. 2 by Shostakovich.”

Sony PCM M 10

I’m seriously looking at buying a M 10 and have been doing the usual web research and conseqeuntly picked up a few interesting links to reviews, specs and opinions. Here they are.

Pricing

Product previews and reviews

PCM M 10

PCM M 10

http://www.soundonsound.com/news?NewsID=11803

European Union MP3 Player Sound Level Legislation

Via the BBC, the European Union is proposing changes to MP3 players to prescribe default safe listeing levels for MP3 players. Current legislation mandates that “a statement be put in the instruction manual to warn of the adverse effects of exposure to excessive sound level”. The new proposals would see that the default sound setting for any device “shall be the ‘default’ settings on products”. January will see the start of a two-month consultation of all EU standardisation bodies with a final agreement expected in the spring of 2010.

The EU notes that safe use depends on exposure time and volume levels, “At 80 dB(A), exposure should be limited to 40 hours/week. At 89 dB(A) exposure should not exceed 5 hours/week”.

FLAC vs APE vs OGG

I’ve done a short test to look at how much saving lossless digital sound formats can provide considering the 20 or so gigabytes of data I generate a month. I did some tests rendering a WAV file from Reaper.

I used a single 16 bit WAV file of a P-51 Mustang downgraded from the original 24bit original arranged on a single track in Reaper then used the standard render option in the application to generate each file. The file sizes are taken from the windows command prompt as the standard explorer window tends to display “size on disk” which is not necessarily the file size – don’t know what additional things are allocated.

These are the results. As part of the test I’ve also included OGG Vorbis – I think that most people can imagine the savings if going to MP3. I’ve included the reference file at the top of the table and added in the resulting file size, how much space this would save and how big this is compared to the original. I’ve not played the files so I have no idea whether the renders were successful or not but I must assume they are.

File Name Encoding File Size (bytes) % saving % of original
render_tests_mustang.wav WAV 16 bit 3,528,654
render_tests_mustang.aif AIF 3,528,054 0% 100%
render_tests_mustang_0_0.ogg OGG Vorbis Quality 0 147,604 96% 4%
render_tests_mustang_0_1.ogg OGG Vorbis Quality 0.1 182,530 95% 5%
render_tests_mustang_0_2.ogg OGG Vorbis Quality 0.2 215,947 94% 6%
render_tests_mustang_0_3.ogg OGG Vorbis Quality 0.3 244,887 93% 7%
render_tests_mustang_0_4.ogg OGG Vorbis Quality 0.4 259,348 93% 7%
render_tests_mustang_0_5.ogg OGG Vorbis Quality 0.5 329,504 91% 9%
render_tests_mustang_0_6.ogg OGG Vorbis Quality 0.6 396,084 89% 11%
render_tests_mustang_0_7.ogg OGG Vorbis Quality 0.7 440,737 88% 12%
render_tests_mustang_0_8.ogg OGG Vorbis Quality 0.8 529,460 85% 15%
render_tests_mustang_0_9.ogg OGG Vorbis Quality 0.9 718,815 80% 20%
render_tests_mustang_1_.ogg OGG Vorbis Quality 1.0 1,065,815 70% 30%
render_tests_mustang_0_16.flac FLAC 16 bit Quality 0 1,536,320 56% 44%
render_tests_mustang_1_16.flac FLAC 16 bit Quality 1 1,532,669 57% 43%
render_tests_mustang_2_16.flac FLAC 16 bit Quality 2 1,529,202 57% 43%
render_tests_mustang_3_16.flac FLAC 16 bit Quality 3 1,428,272 60% 40%
render_tests_mustang_4_16.flac FLAC 16 bit Quality 4 1,428,331 60% 40%
render_tests_mustang_5_16.flac FLAC 16 bit Quality 5 1,419,175 60% 40%
render_tests_mustang_6_16.flac FLAC 16 bit Quality 6 1,418,948 60% 40%
render_tests_mustang_7_16.flac FLAC 16 bit Quality 7 1,406,657 60% 40%
render_tests_mustang_8_16.flac FLAC 16 bit Quality 8 1,405,965 60% 40%
render_tests_mustang_fast_16.ape APE 16 bit Fast 1,378,608 61% 39%
render_tests_mustang_normal_16.ape APE 16 bit Normal 1,358,408 62% 38%
render_tests_mustang_high_16.ape APE 16 bit High 1,357,000 62% 38%
render_tests_mustang_extrahigh_16.ape APE 16 bit Extra High 1,336,964 62% 38%
render_tests_mustang_insane_16.ape APE 16 bit Insane 1,331,224 62% 38%
render_tests_mustang_fast_24.ape APE 24 bit Fast 3,120,876 12% 88%
render_tests_mustang_normal_24.ape APE 24 bit Normal 3,096,668 12% 88%
render_tests_mustang_high_24.ape APE 24 bit High 3,094,732 12% 88%
render_tests_mustang_extrahigh_24.ape APE 24 bit Extra High 3,081,804 13% 87%
render_tests_mustang_insane_24.ape APE 24 bit Insane 3,077,728 13% 87%

A conclusion from these tests is that APE produces smaller file sizes that FLAC so if space is your major concern this is the format to go for, however it could be said that support for the FLAC format for playback is more widespread and has been included in some of the newer MP3 players released recently (the iRiver range has direct support for in some newer model and support via RockBox firmware upgrades).

Does this start to adress some of the issues, around storage, not just space issues, but archival format and archive media, archive risk etc?

For me, the archival format will be the original file on harddisk with a back up on DVD. My day to day review format will probably remain as VBR Mp3 but I may start looking at FLAC for distribution of sound.

See also [post="767"]

U.S. Navy Predates SETI

According to a telegram discovered by Letter of Note, the U.S. Navy cooperated with a group of astronomers in 1924 in listening in for any radio communications from Mars.

No note is made of any sounds picked up but I can’t help think it would be good to hear the static they more than likely managed to find.

Telegram from the Secretary of the Navy to All Naval Stations Regarding Mars, 08/22/1924

Telegram from the Secretary of the Navy to All Naval Stations Regarding Mars, 08/22/1924

48Kbps AAC+ and 160Kbps OGG Vorbis Testing

Using a small sample group, CNET have concluded that that people cannot tell the difference between Sky’s streaming audio at 48Kbps AAC+ and Spotify’s use of 160Kbps OGG Vorbis.

View full article »

New Sony, Zoom and Olympus Recorders

3 new recorders announced this week, Olympus LS-10, Zoom Q3 and the Sony PCM M-10.

Olympus LS-11

Visually similar to the currently popular LS-10 but with more in-built memory and longer claimed battery life.

More information from Olympus here.

Zoom Q3

This new Zoom shares build with the H4 series but adds a camera.

Zoom Q3, in a colour that looks like something Dr Manhattan would come up with

Zoom Q3, in a colour that looks like something Dr Manhattan would come up with

Not sure if that is a good idea or not.

Zoom says, “The Q3 uses the same microphone capsules as our industry-leading H4n Handy Recorder and is perfect for recording anything where great audio and video are a must. From live musical performances and rehearsals, interviews, conferences to video podcasts, journalism, education, recitals, weddings or sports, the Q3′s pristine audio quality takes your videos to another level. Designed with everything you need to make your movies right out of the box, the Q3 includes HandyShare software for editing, and a 2GB SD card for up to 1 hour of video recording time. And the Q3 will also accept up to 32GB SDHC cards for a staggering 16 hours of moviemaking”

Details from Zoom here.


Sony PCM M-10Sony M10

This looks like the best of the bunch to me. A smaller model than the D-50 and much cheaper than the D-1. This model adds the ability to record to MP3 on the device, apparantly not available on the D-1 or D-50 (never used one).

An article on Sound on Sound here.

Nothing on the Sony pro site with information on this.

Sound on Sound say, “It’s capable of recording 24-bit audio at sample rates up to 96kHz, and it can also record straight to MP3, a feature not found on Sony’s more expensive portable recorders. (The D1 and D50 come with computer software that lets you convert the recorded PCM audio into a variety of formats, including MP3.)

Other features of the M10 include on-board DSP processors that can alter the pitch and speed of audio during playback, so you can slow down a recorded guitar solo to learn how to play it, for example, and there’s a limiter that can be engaged to prevent the input signal from distorting.

Clever recording functions include a five-second buffer, and there’s the option to install a removable flash memory card, which can be used for computer-less backup and for extending the total recording time of the device (a cross-memory feature spreads a long recording over both the on-board memory and the flash card). Computer connection is via USB and it’s powered by conventional AA batteries.”


via nature recordist.

handheld_comparison_matt_bl

A Quick-and-Dirty Comparison of (Some) Handheld Digital Audio Recorders Matt Blaze 17 July 2009

From a post on the naturesounds list, another good comparison of handheld field recorders, Nagra ARES-MII, Sony PCM-D1, Sony PCM-D50, Olympus LS-10, Zoom H4n, from Matt Blaze. Also included is a baselined recording using a Sennheiser MKH-800 Mid-Side pair into a Nagra VI. These recorders could be considered to be towards the top end of the handheld, built-in mic range.

Well worth the time listening and comparing as they are being used in typical environments for this kid of gear, urban. Probably easier to compare if they were mixed together in a single track.

More links

Information and specs PCM D 50, Thomman

Information and specs PCM D 50, Sony

Review PCM D 50, O’Reilly

Review PCM D 1, Harmony Central

Information and spec PCM D1, Sony

Information and specs LS 10, Olympus

Information and specs LS 10, Thomann

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