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Track 71. This track tests the radiated distortion characteristics of your system. A sine wave from an Audio Precision System One was processed through a special devise that enables us to regulate the amount of distortion desired. The initial signal started with about .0004% distortion. It was processed and recorded on track 71 as a reference for the following tracks. On this track the tone has about .03% distortion. In each track following, the distortion is raised by a factor of about 10 dB. If you have a distortion analyzer, you can check its calibration as the distortion on the following tracks is very precise. Of course if you have a noisy CD player, or a poor D-to-A converter the THD+N may affect the lowest reading of this series of tests. If you don't have a distortion analyzer, you can use these tracks as a masking test. The concept of masking test is simple. By starting out at low levels and increasing the distortion until it is just audible, you have an indication of the distortion threshold of your system or your ability to perceive it. Start with track 71. If you are unsure of what distortion sounds like, skip to track 76 because track 76 has exactly 10% distortion and should be clearly audible to anyone on even a terrible system. Distortion is the slight buzz mixed in with the pure tone. If you can't tell the difference between any of the tracks, the distortion of your system is very high (over 10%) or your hearing is very bad (you've been in car audio for too long). Most people can easily hear 1% distortion on a good system with sine waves.
Track 72. Same as track 71, except with .1% distortion
Track 73. Same as track 71, except with .3% distortion
Track 74. Same as track 71, except with 1% distortion
Track 75. Same as track 71, except with 3% distortion
Track 76. Same as track 71, except with 10% distortion
From "My Disc"
The Sheffield / A2TB Test Disc
Track 71. This track tests the radiated distortion characteristics of your system. A sine wave from an Audio Precision System One was processed through a special devise that enables us to regulate the amount of distortion desired. The initial signal started with about .0004% distortion. It was processed and recorded on track 71 as a reference for the following tracks. On this track the tone has about .03% distortion. In each track following, the distortion is raised by a factor of about 10 dB. If you have a distortion analyzer, you can check its calibration as the distortion on the following tracks is very precise. Of course if you have a noisy CD player, or a poor D-to-A converter the THD+N may affect the lowest reading of this series of tests. If you don't have a distortion analyzer, you can use these tracks as a masking test. The concept of masking test is simple. By starting out at low levels and increasing the distortion until it is just audible, you have an indication of the distortion threshold of your system or your ability to perceive it. Start with track 71. If you are unsure of what distortion sounds like, skip to track 76 because track 76 has exactly 10% distortion and should be clearly audible to anyone on even a terrible system. Distortion is the slight buzz mixed in with the pure tone. If you can't tell the difference between any of the tracks, the distortion of your system is very high (over 10%) or your hearing is very bad (you've been in car audio for too long). Most people can easily hear 1% distortion on a good system with sine waves.
Track 72. Same as track 71, except with .1% distortion
Track 73. Same as track 71, except with .3% distortion
Track 74. Same as track 71, except with 1% distortion
Track 75. Same as track 71, except with 3% distortion
Track 76. Same as track 71, except with 10% distortion
From "My Disc"
The Sheffield / A2TB Test Disc
Actually there is "silent music". Most well-known is probably
4'33'' by John Cage, which is exactly that, 4 minutes and 33
seconds of silence, that is, one is supposed to hear only all
the background noise. Cage performed this work himself in
Hyde Park in London at two occasions about 20 years apart.
He reportedly reacted to how different it sounded the second
time.
There are other examples too. I have been told once that
somebody, I think it was Frank Zappa, made a whole silent
record, or at least one side of it. There was also someone
who put a one-minute silent track on a record and was sued
for infringing on Cages copyright for 4'33''.
4'33'' by John Cage, which is exactly that, 4 minutes and 33
seconds of silence, that is, one is supposed to hear only all
the background noise. Cage performed this work himself in
Hyde Park in London at two occasions about 20 years apart.
He reportedly reacted to how different it sounded the second
time.
There are other examples too. I have been told once that
somebody, I think it was Frank Zappa, made a whole silent
record, or at least one side of it. There was also someone
who put a one-minute silent track on a record and was sued
for infringing on Cages copyright for 4'33''.
IT'S GETTING WORSE EVERY YEAR...
Hi,
Brett moved out of the city and so did I.
The environmental noise made listening to music unbearable as did mains polution,cabs you name it.
Granted I'm demanding,I just want to hear everything I hear on the Stax ELS headphones on my system as well.
At one point I thought I was too demanding,now I know better.
Cheers,
Hi,
Brett moved out of the city and so did I.
The environmental noise made listening to music unbearable as did mains polution,cabs you name it.
Granted I'm demanding,I just want to hear everything I hear on the Stax ELS headphones on my system as well.
At one point I thought I was too demanding,now I know better.
Cheers,
Re: SOUND OF SILENCE
Yes, of course there will be various kinds of noise in a recording,
but I suppose it wasn't intentional in any of these cases. John
Cages composition was noise free, though, even if no recording
of it is.
There are a number of (non-silent) recordings with unintentional
background noise like cars and motorcycles. I also have one
CD where somebody suddenly starts talking during the slow
movement of Chopins 2nd piano concerto. One cannot hear
what they say, though. Although conductors quite often make
various noises, I refuse to believe he is talking. I have been
considering whether it could be the recording staff somehow
but I lean towards thinking that it is actually a radio transmission
that has sneaked in. The recording is from the mid-fifties, by
the way, so I guess the equipment was not designed to
withstand RFI. Come to think of it, maybe it could be the
recording staff after all. Valve microphony, would that be
plausible??
fdegrove said:
Yes, of course there will be various kinds of noise in a recording,
but I suppose it wasn't intentional in any of these cases. John
Cages composition was noise free, though, even if no recording
of it is.
There are a number of (non-silent) recordings with unintentional
background noise like cars and motorcycles. I also have one
CD where somebody suddenly starts talking during the slow
movement of Chopins 2nd piano concerto. One cannot hear
what they say, though. Although conductors quite often make
various noises, I refuse to believe he is talking. I have been
considering whether it could be the recording staff somehow
but I lean towards thinking that it is actually a radio transmission
that has sneaked in. The recording is from the mid-fifties, by
the way, so I guess the equipment was not designed to
withstand RFI. Come to think of it, maybe it could be the
recording staff after all. Valve microphony, would that be
plausible??
MICROPHONY.
Christer,
The term is pretty much self-explanatory I think.
When a device,be that a valve or any other is microphonic it capts vibrations,be that airborne or other forms and its' amplification factor will then come into play and add this information to the original signal causing a smeared and hence distorted net result.
In other words it behaves like a mic although a very bad one.
Prone to microphony:just about every electronic device putting out sound.
Cheers,
Christer,
The term is pretty much self-explanatory I think.
When a device,be that a valve or any other is microphonic it capts vibrations,be that airborne or other forms and its' amplification factor will then come into play and add this information to the original signal causing a smeared and hence distorted net result.
In other words it behaves like a mic although a very bad one.
Prone to microphony:just about every electronic device putting out sound.
Cheers,
Barnatro - a golden bridge to heaven
Stefan Sundström "Barnatro"
EN SALIG SAMLING / FESTIVAL FACD 012
-------------------------
barnatro
barn= child; tro=faith
so a translation would be
"believe in something with a childlike faith, in simple trust"
it is an old christian song, recorded first on 78 record in the 50ies
by "Lapp-Lisa" - A woman in the Swedish Salvation Army
My mother used to sing this song to me, when I was a little child.
--------------------------------------
"Barnatro - Barnatro
till himmelen du är en gyllne bro."
(to .heaven .you are a golden bridge)
We meet in heaven, if not before
/says halojoy
if you don't behave - I'll send the Army of Salvation to get you
----------------------------------------------------------------------
Visit your local Salvation Army website!
The Salvation Army, an International movement, is an evangelical part of the universal Christian church. Its message is based on the Bible. Its ministry is motivated by the love of God. Its mission is to preach the gospel of Jesus Christ and to meet human need in His name without discrimination.
Stefan Sundström "Barnatro"
EN SALIG SAMLING / FESTIVAL FACD 012
-------------------------
barnatro
barn= child; tro=faith
so a translation would be
"believe in something with a childlike faith, in simple trust"
it is an old christian song, recorded first on 78 record in the 50ies
by "Lapp-Lisa" - A woman in the Swedish Salvation Army
My mother used to sing this song to me, when I was a little child.
--------------------------------------
"Barnatro - Barnatro
till himmelen du är en gyllne bro."
(to .heaven .you are a golden bridge)
We meet in heaven, if not before
/says halojoy
if you don't behave - I'll send the Army of Salvation to get you
----------------------------------------------------------------------
Visit your local Salvation Army website!
The Salvation Army, an International movement, is an evangelical part of the universal Christian church. Its message is based on the Bible. Its ministry is motivated by the love of God. Its mission is to preach the gospel of Jesus Christ and to meet human need in His name without discrimination.