Digital Audio Projection - the end of speakers?

janneman · 14th September 2006, 06:56 AM

Lectorum Salutum!

I came across an interesting report on Digital Audio Projection. The full report was sprinkled with copyright notices and threats of punishment if copied unauthorized so I just cut out an exerpt, see below.

Does anyone have experienced such a system or knows more about its performance? Is this the end of speakers farms?

Jan Didden

Tom2 · 14th September 2006, 07:25 AM

Is this the Yamaha YSP-100, YSP-800, YSP-1 equipment?
The Yamaha web site has info. Interesting ideas.
Googling shows various reviews.

Tom

janneman · 14th September 2006, 07:32 AM

Quote:

Originally posted by Tom2
Is this the Yamaha YSP-100, YSP-800, YSP-1 equipment?
The Yamaha web site has info. Interesting ideas.
Googling shows various reviews.

Tom

Yes, the report refers to the YSP-1

http://www.yamaha.com/yec/YSP1/idx_setup.htm

Jan Didden

phase_accurate · 14th September 2006, 08:52 AM

the little secret lies in the statement "without additional speakers". The thingie itself uses tons of them altough tiny ones only.

Regards

Charles

richie00boy · 14th September 2006, 09:01 AM

Sounds like what my classmate was trying to get to work at uni for our Diploma in Acoustics and Noise Control project.

Basically it uses summed beams of HF and modulation to achieve the desired tones, e.g. two beams one at 25kHz the other at 26kHz and where they cross you get a 1kHz tone.

As all the 'work' is done at HF you only need small drive units.

janneman · 14th September 2006, 09:11 AM

Is that how it works? I was more thinking on the methods used for radar beam steering. You transmit the signal from an array of transducers, and apply small phase shifts to adjacent transducers. That way you get nulls in certain directions and reinforcements in other directions.

By manipulation of the phase shifts in each matrix elements you steer the beam.
That is the mathod used by air defense and jet fighter phased arrray radars. The big advantage is that your antenna is stationary taking out a lot of potential problems with mechanical scanning and doing it all solid state.

Since it depends on heavy use of DSP's, it would be a natural technology for audio now that audio DSP's really are taking off.

But I could be wrong,

Jan Didden

phase_accurate · 14th September 2006, 09:14 AM

Quote:

I was more thinking on the methods used for radar beam steering. You transmit the signal from an array of transducers, and apply small phase shifts to adjacent transducers. That way you get nulls in certain directions and reinforcements in other directions.

Yes this is the way it works !

Regards

Charles

jneutron · 14th September 2006, 02:10 PM

My gut feeling is that eventually somebody will incorporate ultrasonics into osha requirements, and this technology will go away.

Not a lot is understood about long term exposure to ultrasonic acoustic energy. It has the ability to deliver significant energy levels to the eardrum as a result of it's wavelength.

Cheers, John

14th September 2006, 09:01 AM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Sounds like what my classmate was trying to get to work at uni for our Diploma in Acoustics and Noise Control project. Basically it uses summed beams of HF and modulation to achieve the desired tones, e.g. two beams one at 25kHz the other at 26kHz and where they cross you get a 1kHz tone. As all the 'work' is done at HF you only need small drive units. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

14th September 2006, 09:11 AM	#6
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Is that how it works? I was more thinking on the methods used for radar beam steering. You transmit the signal from an array of transducers, and apply small phase shifts to adjacent transducers. That way you get nulls in certain directions and reinforcements in other directions. By manipulation of the phase shifts in each matrix elements you steer the beam. That is the mathod used by air defense and jet fighter phased arrray radars. The big advantage is that your antenna is stationary taking out a lot of potential problems with mechanical scanning and doing it all solid state. Since it depends on heavy use of DSP's, it would be a natural technology for audio now that audio DSP's really are taking off. But I could be wrong, Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Freebi Digital Equilisation for FR speakers	dpaws	Full Range	4	24th March 2009 02:48 AM
FS: Delta Digital 250 Projection Len and RGB filters	Faites777	Swap Meet	0	29th June 2007 05:34 AM
Digital Sound Projection from Yamaha	AAK	Multi-Way	1	12th April 2005 08:34 PM
Digital compressed-air speakers!	CeramicMan	Multi-Way	8	3rd July 2004 05:42 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

14th September 2006, 07:25 AM	#2
Tom2 diyAudio Member Join Date: Jun 2004 Location: Central CA	Is this the Yamaha YSP-100, YSP-800, YSP-1 equipment? The Yamaha web site has info. Interesting ideas. Googling shows various reviews. Tom

14th September 2006, 08:52 AM	#4
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	the little secret lies in the statement "without additional speakers". The thingie itself uses tons of them altough tiny ones only. Regards Charles

14th September 2006, 02:10 PM	#8
jneutron diyAudio Member Join Date: Jan 2004 Location: away	My gut feeling is that eventually somebody will incorporate ultrasonics into osha requirements, and this technology will go away. Not a lot is understood about long term exposure to ultrasonic acoustic energy. It has the ability to deliver significant energy levels to the eardrum as a result of it's wavelength. Cheers, John

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)