Super TGSL With H Bridge TX Diff RX Quad Sampling

[scrungy_doolittle]

It is no mystery. I found that I like proportional audio much better than the common binary beepy response. Because in an intuitive soundspace the volume/depth relationship is too steep for linear law amplification of target responses (the 6th power etc.) I found that equalising the response by means of a log-compression works the best. Hence a diode compressor. As a bonus, I can tolerate more gain for the small signal so my dynamic range is wider.
I also kept a similar arrangement for gating, as it keeps the opamps out of saturation. Because all the opamps in a same package draw bias from the common circuitry, and they all share common rails, any saturation would affect all the opamps in a package, at least by introducing a delay after a saturation event. The overall response is dead on punctual with diodes, and I can easily discern multiple tergets.

Thanks Davor, for me it is a mystery. I just need a guru to help me understand each block in some of these. The micros actually simplify a lot of stuff. The pic24 that I am looking at has 3 comparators, and two opamps built into the processor.
I am trying to understand part of the attached schematic. Specificaly, the receive amp. You will notice that this guy is running a DAC to the - input of this device. What would be the reason for that, and what would that accomplish? Additionally, why the small inductor to ground and the one to + voltage. I think he is abusing an audio amp for the transmit. Seems to me like it is the current you really need, and that could be done with an opamp, feeding t

[Davor]

scrungy_doolittle, the attachment is not correct and I don't know what it's about. Sorry.

[TreasureHunter]

Helo everyone!

I'm new here, and very interested in this project? Are there any improvements? How is this project going?
Can we make the Super TGSL to be Super IGSL instead, to make two sounds instead of just one?
Something like this:
https://www.youtube.com/watch?v=3SPuarDiRds

[TreasureHunter]

is this project dead? :\

[Mike]

is this project dead? :\

I hope not. It looked very promising. We will have to wait and keep our fingers crossed, I guess.

[Davor]

I promised a way to deal with phases so that the clocking gets right. I know exactly how to fix those, but I'm terribly busy lately. The vast majority of actual work here was done by Silver Dollar.

[jladre]

For me tgsl is a very good project..why dont try to build one? "Caution not for beginner project"..

[ashefr10]

hello , can be increased slightly thee TGSL scope by acting on some component of the oscillator? thanks

[Davor]

Increased what?

[ashefr10]

to gain depth

[Davor]

Amplitude modulation of the Tx signal spoils depth, so the best option is to keep amplitude close to maximum that is limited by power rail and consequently with low amplitude modulation, but not all the way to maximum to keep harmonics low. If it is tuned correctly, it will be, say, 5% lower than absolute maximum. Going for the maximum spoils harmonics, and they also reduce depth.

To experience any significant depth improvement, you'd need double amplitude or more. To do that you'd need a completely different topology of oscillator.

[ashefr10]

OK damage because the TGSL has exemplary discrimination but is less powerful

[Davor]

Discrimination when done by gating GB channel is always less deep because both GB and discrimination channel must be ON simultaneously, and at discrimination edges (on both sides) sensitivity is low. It could be remedied if there is no offset at any channel, and if there is no gating, but instead frequency modulation or some other way of indication. The most sensitivity is lost in anti-chatter and threshold circuitry.
In short, TGSL is a representative of a typical gated discrimination VLF. To go beyond its limitations you need to do a few things differently.

[Thomas]

To go beyond its limitations you need to do a few things differently.

Don't leave me in suspense, what might be done differently? I've been trying to decide what would be a good project to spend my time on.

[Davor]

It is not that simple. There is no such rig available for reverse engineering and of all rigs on the market I suspect only Deus to be doing something of the sort. As mentioned above, there is a lot lost in traditional discrimination processing. There is no way to convince a traditional discriminating rig to do it properly, so the only way to do it good is from the scratch.
On the plus side, being detached from the old ways, I could throw in some multi-frequency tricks to make it all even more interesting. My day job and my family obligations will surely slow my pace, but I'll get there.