#signal processing

[delimited-continuation]

[wangleline]

I built my own little artifact-heavy midi harmonizer

[technological-existentialism]

[noisytenant]

[research-and-survive]

13/03/2024

Here we go again, another day looking at EEG data and pretending I actually know what I’m doing 🙃

I have a meeting at 11 a.m so, obviously I stopped being able to focus on anything at 10 a.m

At least I have yet to feel like I suck at everything this week, although it’s only Wednesday, I have time!

[andmaybegayer]

Got a cheap bluetooth dongle so I can get bluetooth audio on my PC.

(Yes I know I recommend everyone have a wireless card in their desktop purely for this eventuality. I have a motherboard that can accept a wireless M.2 card. I just didn't use it. I have plans.)

Anyway. I finally have a good driver stack and hardware to try SBC-XQ. Didn't want to work on my laptop for some reason. I think that SBC-XQ is the funniest bluetooth codec. Sony and Qualcomm put quite a lot of proprietary effort (and patents) behind LDAC and Apt-X HD respectively but Shannon is the deadliest son of a bitch in the world of information transmission so it turns out just juicing the bitrate on SBC to 512kbps comes out more or less perceptually identical to Apt-X HD at 512kbps. SBC-XQ requires absolutely zero other changes and is often completely backwards compatible.

LDAC/LHDC pushes more detail but at its highest bitrate it needs a stupendous ~1000kbps and is, once again, basically indistinguishable from SBC-XQ in all but the most perfect listening environments.

Truly the 320kbps Opus of Bluetooth codecs.

[datascienceunicorn]

HT @dataelixir

[extraplugins148]

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[beastwithteeththehorse]

the fourier transform is like a child to me at this point

[wangleline]

re: my last post, here's a much more intense version with more artifacts and weird shit happening in the midi harmonizer

[addiekinstudios]

Doing more development on the non-linear music genrator

[research-and-survive]

I am lost

Starting a project that is completely new to you is super interesting, but there is always that really slow learning period...

I just started a neuro-rehabilitation project, which I think is awesome, but the thing is, I don't know how to do almost anything right now, which is frustrating!!

I studied signal and image processing in college, but didn't really used it for about 4 years. I thought it would be fine and it would be just remembering things... It is nothing like that, because this is so much more specific and I am just completely lost in all of this...

[thursdayisbetterthanfriday]

Penguins are very, very cool! Time for some bioacoustics facts about them! Did you ask for it? No. But you're getting them anyway. I WILL MAKE YOU LEARN VIA SHIPPING PENGUINS.

Penguins - The final frontier

Penguin colonies are very large, as you can see from the photos in the first posts. Often you have significant background noise from all the other penguins, and winds, which can reach 95 decibels or more!

As you can imagine, this makes life difficult for communication purposes. So how do our feathered friends find family, fame, fortune and full-time lovers?

Claude Shannon

What! It's black and white, but that's not a penguin!

Correct! This is information theory progenitor Claude Shannon. He's going to help us understand this. There is, in fact, not a tiny Claude Shannon inside every penguin (...yet 👀), but he will help us to understand their lives through information theory.

In information theory terms we can simulate a penguin as follows:

A signal emitter (aka. the beak and bellows)

A signal receiver (aka. the sleek ears)

Think of this as similar to your high school mathematics/physics textbooks with all their lovely assumptions.

To successfully communicate we must use a signal, from a transmitter, to be collected by a receiver which must then be processed successfully.

Ideally there would be a direct transmitter to receiver system with no noise, but life isn't fair and we must all suffer.

Penguins live in very windy areas. This means there's a lot of what we call "noise" which gets in the way of communication. Think of it like going to a concert, or noise restaurant, and trying to have a conversation.

This adds "noise" to signals. If you think of playing a gramophone records, or watching a cassette tape, think of the scratch of the needle or the grain/static on the video screen. The video is still there, but you can likely understand most of it if the noise is low enough.

The aim is for one penguin lover to "signal" itself the other. So what do they do? They create a unique set of syllables which they call out to the crowd. It's like their own penguin serial number - or musical song!

This works! The repeated pattern is like a unique serial number so even if some of the notes are missed, it can be understood by the other penguin. So what if it's really noisy?

They increase the number of syllables if there's more noise! That means that there's more of a chance for the other lover to hear their calls over the cacophony of wind and other penguin calls. A longer melody that

Pretty neat right?

Nerds who study this in more detail find that it's actually the modulations in frequency which the penguin's "receivers" (aka. ears) are attuned to and are used in recognizing each other. Changing pitch doesn't do a thing. (There are exceptions for some penguin species - see the references for more details).

But wait, there's more!

Penguins have social courtesy rules. Like Tumblr users, they too want to ship other penguins as cute couples. When one penguin calls out to another, other penguins within a 7 meter, or so, radius will fall silent.

Remember: There is still some good in the world

But it gets more interesting with certain types of penguins.

Some penguins are BUILT DIFFERENT. Emperor Penguins are, in fact, DIRECTIONAL TRANSMISSION UNITS who use the curvature of their bellies to amplify their calls in one specific direction.

They are literally built for loving.

And this, casual reader, is technically HOW LOVE WINS!

🐧🐧 Now you can resume your usual programming of shipping the cute penguins 🐧🐧

Want to know more?

Most of this I learned from a great book written by a French neuroscientist and bio-acoustics expert, Nicolas Mathevon. Link in the references. There's more I didn't talk about so take a look if you're into this kind of thing.

The animal kingdom is a treasure trove of unique information networks, with creatures specifically evolved to utilize them. It's a real treat to uncover and explore it all.

References:

How do king penguins (Aptenodytes patagonicus apply the mathematical theory of information to communicate in windy conditions? T.Aubin et al (1999)

The Voices of Nature. N. Mathevon (2021)

jesus christ i'm so stressed for him

[vbsemi-mosfet]

Application of VBE1638 MOSFET in Automotive Instrument Control Unit: Enhancing Power Management and Signal Processing

With the continuous advancement of automotive electronics technology, the Instrument Control Unit (ICU) serves as a crucial module in automotive electronic systems, responsible for processing and displaying key vehicle information. To meet the high demands for efficiency and reliability in modern vehicles, the ICU module requires superior performance in power management and switching control. The VBE1638 MOSFET, launched by VBsemi, provides an ideal solution with its excellent electrical characteristics, significantly improving the efficiency of signal processing and power management in ICU modules.

Efficient Power Management The ICU module must achieve stable power management under various load conditions, and the VBE1638, with its 60V drain-source voltage and maximum drain current of 45A, meets the demands of high-power applications. Utilizing advanced trench technology, it reduces on-resistance (with a typical value of only 25mΩ), which minimizes power loss, enhances power management efficiency, reduces heat generation, and extends the lifespan of the device.

Precise Signal Processing Precise signal processing is critical in automotive ICU modules, especially when dealing with complex sensor data. The VBE1638 MOSFET, with its low threshold voltage of 1.7V, enables quick response, ensuring the circuit can switch rapidly and adapt to different working states. Its +20V gate-source voltage (V_GS) ensures high reliability and stability in various driving environments.

Robust Thermal Performance The automotive environment is highly demanding, requiring ICU modules to operate stably over long periods under high temperatures, vibrations, and current fluctuations. The VBE1638, packaged in a TO252 casing, offers excellent thermal performance, effectively preventing overheating in high-temperature environments, ensuring long-term stable operation, and reducing vehicle system maintenance costs.

Application Advantages The VBE1638 MOSFET is widely used in automotive instrument control unit modules, with optimized power management and power control performance ensuring reliable operation under varying load conditions. Whether in power management systems or complex control scenarios, the VBE1638 delivers stable and efficient performance.

Product Specifications

Model: VBE1638

Package: TO252

Polarity: N-channel

Drain-Source Voltage (VDS): 60V

Gate-Source Voltage (VGS): +20V

Threshold Voltage (Vth): 1.7V

On-Resistance (RDS(on) @VGS=4.5V): 30mΩ

On-Resistance (RDS(on) @VGS=10V): 25mΩ

Maximum Drain Current (ID): 45A

Technology: Trench

Other Applicable Areas

Power Tools: In the power tool sector, such as drills and hammers, MOSFETs provide stable power output. With its high current-handling capacity and low on-resistance, the VBE1638 is an ideal choice for these modules, ensuring high efficiency and stable performance under heavy workloads.

Industrial Automation: The VBE1638 is suitable for industrial automation equipment, including PLC controllers and motor drivers, supporting efficient automation and continuous innovation in smart manufacturing systems.

LED Lighting: In LED lighting applications, the VBE1638 is used in LED driver modules, providing stable and efficient power support, ensuring long life and low energy consumption for LED lamps, streetlights, and landscape lighting products.

As a high-performance MOSFET designed for automotive instrument control unit modules, the VBE1638 excels in power management and signal processing. Whether in complex signal processing scenarios or high-load power management, it helps enhance the overall efficiency and stability of ICU modules. As automotive electronics continue to evolve, the VBE1638 will play a vital role in more automotive applications, contributing to the innovation and upgrading of automotive electronic systems.

[constelli1122]

Constelli - A Signal Processing Company in Defense and Aerospace

Constelli is a signal processing company solving problems in Defense and Aerospace fields.