Holographic imaging

Unsound, Tvad,

You’re right the concert hall was not meant to imply a change in perspective by switching seats. Just that it was convenient to illustrate changes in distance from the sound object and how it does impact the pitch as your movement occurs. And yes it would be below the threshold of human perception to actually hear a change in pitch as you are walking from front to back or vice versa. But the principal still applies. The 3 locations, front row, 10th row and 20th row represent relative settings in gain which if you were to “jump” between them would in fact throw off the perceived pitch.

Atmasphere,

Thank you for your response. The speed of the amplifier you refer to (slew rate) only addresses the “vertical” speed of the amplifier circuit. What I am referring to with velocity is the lateral or horizontal speed of the circuit. IOW my interest is in the manner that a given input signal travels from input to output and more importantly is it (the velocity) constant.

Regards,

Roger

Grant,

I can tell you from personal experience patents are a very expensive proposition. Once you have obtained a patent and its published it is open for all to see. A 20 percent change in the original design is often all that is nessasary to get around the original design. If you have the bucks to litigate well then you may have a chance. If you don't, then think twice about doing so. Electronic circuits sometimes are potted with material that disguise whats in side. If you remove the potting material you may destroy the design underneath. I suppose you could always x-ray the underneath. Also in prototype developement when the product is tested or any pre release publicity is issued describing the product in drawing or photos you have one year from the first disclosure date to file for patent protection. Tom

Thanks for the explanation, Tom.

Are you speaking for Roger?

Grant.

Sorry I jumped in line here. Like I said this was my own personal experience. I did speak to Roger about a year ago, about the Doppler effect. I have never heard his products anywhere anytime. I hope too encounter them at some time. I had to recently reconsider this whole patent process again, its costs and its benefits. Further enhancements to your existing patent requires more disclosure and more money. So Grant when I saw your question of Roger I was relating my own recent re experience. Tom

The problem with the amplifier doppler shift theory is that it hinges on a redefinition of the term "doppler shift." At least in science, terms have precise meanings, almost always defined mathematically. Redefining the terms renders the terms meaningless.

The doppler shift refers to a shift in the frequency of a wave due to relative motion between the receiver (the person or the recoding medium in this case) and the source of the wave. The electrical signal traveling through the amplifier cannot have a doppler shift with respect to the receiver because the person is not a receiver for the electrical wave. The person only becomes the receiver when the signal is the sound wave. Whatever happens inside the amplifier has nothing to do with doppler shift.

The original proffered argument for doppler shift in audio equipment was that the motion of the microphone transducer or the speaker driver relative to the sound source wave source or sound wave receiver, respectively, caused a doppler shift. This is also untenable because it falls outside the accepted scientific definition for doppler shift. The source of the wave and the reciever of the wave are independent of the existence of the wave in the definition. The motion of the speaker driver creates the sound wave; the motion is the source. Hence, there can be no doppler shift resulting from that motion because the wave does not exist without the motion. The same thing is true on the microphone end. The motion of the transducer creates the electrical wave. So there is no doppler shift resulting from that motion, by definition.

The receiver has to be able to receive the signal whose source is in motion relative to the receiver. If not, there is not a doppler shift.