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SOS Technical Glossary

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Re: SOS Technical Glossary

PostPosted: Tue Sep 05, 2017 10:03 am
by Hugh Robjohns
:lol:

Re: SOS Technical Glossary

PostPosted: Thu Feb 01, 2018 11:36 pm
by wireman
Hugh Robjohns wrote:I am pleased to report that the SOS Technical Glossary has been found in the back of a cupboard, dusted off, and slotted back into the online archives.
...
There are plans to develop this resource substantially in the future, too... but in the meantime, we welcome any suggestions for other terms to be added.

Belatedly and hurried (as I just noticed this interesting post) here are some comments...

  • Algorithm

    First definition is not correct.

    An algorthm is a sequence of instructions describing how to perform a task, often implemented in a computer language and compiled into a computer program. For example Quicksort is an algorithm for sorting data.
  • Computer
    I think it is much more than the definition provided.
  • Data Reduction
    The text describes compression (of data) rather than any other data reduction techniques. So perhaps move it to a compression (data) entry.
  • File
    A container for stored digital data that usually has a meaningful name which it can be accessed by. ...
  • Initialize
    I don't think so, this could just return a device to a startup state with new settings that were not a factory default.
  • K
    should be lower case
  • MB
    10- (SI units) or 2-based depending on context, MiB is a more recent tern to help disambiguate this in computing contexts.
  • Moving Coil
    Also the moving coil phono cartridge.
  • Near Field
    Also used to describe the distance from a sound source or a device to be used at that position (for example a microphone)
  • Nyquist Theorem]
    Why concentrate on aliasing, isn't the point that this frequency is what is required to reproduce the original signal?
  • Reverberation Time
    Add a definition for this.

Re: SOS Technical Glossary

PostPosted: Fri Feb 02, 2018 12:35 am
by Hugh Robjohns
Thanks -- useful feedback. I'll take a look at incorporating these ideas tomorrow.

H

Re: SOS Technical Glossary

PostPosted: Fri Feb 02, 2018 1:03 am
by Watchmaker
Brilliant.

Under Audio Interface perhaps an update for Thunderbolt, AVB and Dante protocols is warranted?

Re: SOS Technical Glossary

PostPosted: Fri Feb 02, 2018 11:23 am
by Hugh Robjohns
wireman wrote:Belatedly and hurried (as I just noticed this interesting post) here are some comments...

Thanks again -- I've updated the Glossary.

Nyquist Theorem
Why concentrate on aliasing, isn't the point that this frequency is what is required to reproduce the original signal?

Yes... but the reason it is necessary to sample at (at least) twice the wanted signal bandwidth is to ensure the modulation images don't overlay the wanted audio -- which is aliasing. Only in this way can the original audio be perfectly reconstructed.

H

Re: SOS Technical Glossary

PostPosted: Fri Feb 02, 2018 11:24 am
by Hugh Robjohns
Watchmaker wrote:Under Audio Interface perhaps an update for Thunderbolt, AVB and Dante protocols is warranted?

Good point -- done!

H

Re: SOS Technical Glossary

PostPosted: Fri Feb 02, 2018 10:26 pm
by wireman
I have a final set of suggestions.

An alternative definition:

  • Room Modes
    Resonances of a room occuring at particular frequencies due to patterns of sound waves caused by surface reflections. Particularly evident at low frequencies.

Possible new definitions:

  • Pot
    A rotary control usually used in mixers and other processors. Derived from potentiometer.
  • Snake
    A multi-core cable providing connections at both ends used as an alternative to using many individual leads.
  • Loom
    A set of leads bound together for convenience.
  • Gooseneck
    Used to describe a curved (and possibly flexible) part of a support or microphone.
  • Isolation Room
    A room or large enclosure that provides sound isolation, used for practice rooms and recording studios.

Re: SOS Technical Glossary

PostPosted: Fri Feb 02, 2018 10:49 pm
by Hugh Robjohns
:thumbup: Good suggestions. I'll implement them over the weekend. Thanks.

H

Re: SOS Technical Glossary

PostPosted: Sun Feb 04, 2018 2:44 pm
by Hugh Robjohns
Done.

Re: SOS Technical Glossary

PostPosted: Sun Feb 04, 2018 4:45 pm
by John Willett
wireman wrote:I have a final set of suggestions.

An alternative definition:

  • Gooseneck
    Used to describe a curved (and possibly flexible) part of a support or microphone.

This definition is incorrect.

A Gooseneck (sometimes calles swan neck) is always flexible - that's why it's called a goose neck.

A non-flexible extension is called an "extension tube"

So - the correct definition would be:-

  • Gooseneck
    Used to describe a curved and flexible part of a support for a microphone.

Re: SOS Technical Glossary

PostPosted: Sun Feb 04, 2018 5:03 pm
by Hugh Robjohns
Yes... I did wonder about that as I typed it and was going to consult with my colleagues about it tomorrow. But what the heck, let's just go with 'flexible'! I've updated the entry.

H

Re: SOS Technical Glossary

PostPosted: Tue Feb 06, 2018 9:53 pm
by wireman
John Willett wrote:A Gooseneck (sometimes calles swan neck) is always flexible - that's why it's called a goose neck.

I thought this as well but I did a quick check for exceptions and came up with this microphone which is described as having a fixed-placement gooseneck.
Looking further, I see that this does not mean what I thought it did at the time.

Re: SOS Technical Glossary

PostPosted: Wed Feb 07, 2018 4:17 pm
by John Willett
wireman wrote:
John Willett wrote:A Gooseneck (sometimes calles swan neck) is always flexible - that's why it's called a goose neck.

I thought this as well but I did a quick check for exceptions and came up with this microphone which is described as having a fixed-placement gooseneck.
Looking further, I see that this does not mean what I thought it did at the time.

This microphone *is* flexible - it just has a solid bit in the middle, but it's flexible at both ends. So can really be called a gooseneck.

If it was fixed angles, like the AKG VR1, then it would not be a gooseneck.

Re: SOS Technical Glossary

PostPosted: Tue Nov 06, 2018 2:25 am
by Eddy Deegan
That's a comprehensive glossary Hugh :)

While browsing it I noted the lack of an entry for Overtone. At first I thought it was just another word for Harmonic but something in the back of my head tickled and I googled it a bit and found a definition of Overtone is defined as any frequency having a larger value than the fundamental frequency of the system. When an overtone is combined with the fundamental frequency, it is known as a partial. A harmonic is such a partial having an integer multiplication of the fundamental.

Overtones featured in my early piano education but I'd lost the definition over the years - basically, they are the mess from which harmonics can be picked. Or something!

(May be too trivial for the glossary but I figured I'd mention it)

Re: SOS Technical Glossary

PostPosted: Tue Nov 06, 2018 11:34 am
by Hugh Robjohns
Thanks Eddy, I'll add that one in. EDIT: Done!

I remember getting horribly confused way back with the different numbers of overtones and harmonics...

H

Re: SOS Technical Glossary

PostPosted: Tue Nov 06, 2018 5:41 pm
by Folderol
Thanks for that Eddy. It greatly clarifies some aspects of my synth of choice - especially as the original designer is not a native English speaker!

Re: SOS Technical Glossary

PostPosted: Thu Nov 22, 2018 5:20 pm
by ef37a
Hugh Robjohns wrote:Thanks Eddy, I'll add that one in. EDIT: Done!

I remember getting horribly confused way back with the different numbers of overtones and harmonics...

H

I dimly remember being told that 2kHz is the FIRST Overtone of 1kHz but the SECOND Harmonic?

Dave.

Re: SOS Technical Glossary

PostPosted: Thu Nov 22, 2018 5:45 pm
by Hugh Robjohns
Quite so! :D

Re: SOS Technical Glossary

PostPosted: Thu Nov 22, 2018 8:11 pm
by wireman
Since I just sent my old cassette tape deck (AIWA AD-F660) away to see if it can be repaired I realise the glossary is missing some tape-related definitions:

  • Wow
  • Flutter
  • Dropout (tape)

Also for the Dolby entry describing noise reduction and surround technologies there was also Dolby HX which I think just optimised the use of bias on recording for high signal levels.

Re: SOS Technical Glossary

PostPosted: Thu Nov 22, 2018 9:07 pm
by Hugh Robjohns
wireman wrote:I realise the glossary is missing some tape-related definitions:

Good call. I'll add those tomorrow.

Also for the Dolby entry describing noise reduction and surround technologies there was also Dolby HX which I think just optimised the use of bias on recording for high signal levels.

Yes, as I recall, it reduced the bias level when there was strong HF content in the audio signal to avoid unnecessary overbiasing. I'll check the detail and add it to the glossary. Thanks.

H