Glossary and Acronyms Help Wanted

**Sonnie** · **09-14-06, 05:11 PM**

We have started a Glossary and Acronyms page ... Glossary (Link is also in the navigation bar menu up top.).

We are looking for related words/terms and/or acronyms that can be added. If you know of any, please post them here in this thread and we will review the suggestions for addition to the glossary.

Thanks!

**Ayreonaut** · **09-15-06, 07:43 AM**

DRC
Dynamic Range Control (Dolby Digital)

**Sonnie** · **09-15-06, 09:31 AM**

Added!

Thank you!

**Wayne A. Pflughaupt** · **09-16-06, 10:22 AM**

CRT – you might add that this is the screen (display?) that TVs and personal computers have used since their conception (until recently). Basically consists of three “guns”, red, green and blue. Brucek can probably give you a better technical description of them, but it needs to be brief and concise for this.

By the way, how does Dynamic Range Control add up to Dolby Digital?

Regards,
Wayne

**Wayne A. Pflughaupt** · **09-16-06, 10:25 AM**

ghz – needs to be gHz

Regards,
Wayne

**Sonnie** · **09-16-06, 11:51 AM**

Added CRT definition:
Cathode Ray Tube - A vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen. The original screens/displays used for computer monitors and televisions consistig of a red, green, and blue color lense.

Corrected GHz, added Hz and KHz (already had MHz).

I'm not familiar with DRC... maybe Naut can elaborate.

**Fincave** · **09-16-06, 06:06 PM**

SWMBO She who must be obeyed. Always makes me laugh.

**Sonnie** · **09-17-06, 01:01 AM**

This was all your idea to begin with if you remember.

How about SWAMP ???

**eddthompson** · **09-17-06, 12:27 PM**

you missed DTS

also mpeg, for motion picture experts group, and its derivative mpeg-1. mpeg2, mp3, mp4 etc, all codecs

VC-1 and AVC new codecs on bluray/hd-dvd.

Anamorphic, widescreen enhanced thingy

DAC digital to analogue converter.

CD compact disc

DVD, digital versitile disc, or something dumb like that.

THX more lucas world domination

dB decibel.

im sure you can phrase these better

all i can come up with.

edd

**eddthompson** · **09-17-06, 12:35 PM**

few more:

spl, sound pressure level

sxrd, the sony display thing.

LD laserdisc, a mystic device of an av time long gone.

RF Demodulator, some kind of voodoo box asociated with laser discs and DD, and non av types to connect dvd players to old tvs.

Gamma see http://en.wikipedia.org/wiki/Video_gamma

Id also add that rca is a kind of connector usualy for sound and component video.

edd

**lcaillo** · **09-17-06, 01:41 PM**

That would be RF Modulator, not Demodulator. Your tuner is a RF demodulator.

**lcaillo** · **09-17-06, 01:47 PM**

Quote:

eddthompson wrote:

Gamma see http://en.wikipedia.org/wiki/Video_gamma

Also see:

http://www.poynton.com/PDFs/TIDV/Gamma.pdf

**eddthompson** · **09-17-06, 02:11 PM**

Quote:

lcaillo wrote:

That would be RF Modulator, not Demodulator. Your tuner is a RF demodulator.

yup, brain isnt fireing on all cylinders today

edd

**Sonnie** · **09-17-06, 08:41 PM**

I've added quite a few and changed it up a little... still have a few more to add, but you can check it out.

If you believe we can improve on the definitions, please advise here and we will make the necessary changes.

**Sonnie** · **09-17-06, 10:42 PM**

I couldn't find any definition for VC-1 and AVC. If someone can get me up a definition, I'll add them. I don't even know what they are an acronym for.

I think all the rest are there.

**lcaillo** · **09-18-06, 02:55 AM**

Quote:

Sonnie wrote:

I couldn't find any definition for VC-1 and AVC. If someone can get me up a definition, I'll add them. I don't even know what they are an acronym for.
I think all the rest are there.

From the horse's mouth, or other end, depending on your computing orientation:
http://www.microsoft.com/windows/win...2005/VC-1.aspx

AVC could be Automatic Volume Control or a video compression algorithm:
http://www.avc-alliance.org/

**lcaillo** · **09-18-06, 03:22 AM**

Also add Skew, Pincushion distortion, G2 Level (Screen Level)

Note that Balanced audio connections can also use 1/4" Phone jacks and plugs not just XLR.

**lcaillo** · **09-18-06, 03:23 AM**

And one of current interest - CEDIA

**eddthompson** · **09-18-06, 04:15 AM**

AVC i was refering to the video compression, i believe sony were going to use it on bluray instead of vc1, i think both are derived from mpeg4.

edd

**eddthompson** · **09-18-06, 04:30 AM**

The glossary is a realy great piece of work, a true asset to the forum, well done.

edd

**jmprader** · **09-21-06, 02:14 PM**

Sonnie:

How about some layman's definitions relating to subwoofer tech terms like:
Xmax, Bl, Vas, Fs, F3, etc...might want to make them some kind of sub-category under subwoofers, IB's, etc...

**Sonnie** · **09-22-06, 02:30 PM**

Thanks edd!

Yes John... that is a great idea on the TS Parameters... which is probably where they should be sub-categoried at.

**Sonnie** · **09-22-06, 04:27 PM**

I found these:

Hz: The unit of measurement for frequency. 1 Hz is equal to one cycle per second, or the complete cycle of an alternating wave form per second.
Fs: The frequency at which a speaker naturally resonates in free air. (measured in Hz)
Fb: The resonance frequency of the air in a port and the stiffness of air in a ported system. This is commonly referred to as the Tuning Frequency of a ported enclosure. (also measured in Hz)
Fc: The resonance frequency of the Closed-box system.
F3: The frequency at which the acoustic power output from a system has fallen to half of its reference value. This is what we call the systems 3dB down point. (again, measured in Hz)
Q: Yes, this is the guy that made all those fancy gadgets for 007, but that isn't what we mean here. This is actually the ratio of reactance to resistance in a series circuit, or the ratio of resistance to reactance in a parallel circuit.
Qes: The Q of a speaker at its free air resonance, considering only its electrical losses.
Qms: The Q of a speaker at its free air resonance, considering only its mechanical losses.
Qtc: The total Q of a woofer and sealed enclosure (Fc) at the system's resonance frequency, considering ALL resistive losses.
Qts: The total Q of a woofer at Fs, considering all driver (speaker) resistances.
Vas: Volume Acoustic Suspension. This is the volume of air having the same acoustic compliance ("stiffness") as the speaker's suspension. (measured in cubic feet or liters)
Vab: Volume of air hav

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