Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [compression]

24 questions
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6 answers

Lossless compression technique for digital signals in an embedded system

Here's the scenario: I have an embedded system where an ADC logs a 16-bit potentiostat sample every 2 seconds. The system continues to record data for weeks, making memory usage a concern. Instead of using up 16-bits of storage for each of the…
toasty
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6
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4 answers

Algorithm for compressing a stream of 12-bit ADC data in a Cortex M0 microcontroller

In my application, a Cortex M0 microcontroller currently samples an ADC signal at 10 kHz and sends the result via a USB serial cable to a computer. I want to now increase the sampling rate to over 100 kHz and add a second channel. The USB-serial…
mr_js
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1 answer

Video Out through USB (or other means)

For an medium-high speed ADC converter, my FPGA is currently receiving 16-bit samples at 54 MHz over an LVDS interface (4 differential signal lines plus 1 differential clock signal). These are video/camera signals. Now, I need to consider how I can…
Pål-Kristian Engstad
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Why does reciprocating compressor's motor starting winding have high voltage than running winding

I want to know why the starting winding of (2 ton) reciprocating compressor's motor have high voltage than running winding? I have attached the voltage that I have captured from oscilloscope. This reciprocating compressor has potential relay with…
Fame
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1 answer

Why does using Discrete Cosine Transform lead to data compression?

DCT is used in JPEG standard along with Huffman encoding to further compress the result. I understand that most of the data in spatial domain which is an image is "present in low frequencies". This is because most adjacent pixels change only little…
quantum231
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Chirp pulse compression as described in Stimson's book

I reference the below diagram, from Stimson's Airborne Radar, 2nd Ed. In the text he discusses how the frequency increases linearly throughout the duration of tau. The sketch of the frequency x time matches this description, but looking at the…
fpd011
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Efficient single cycle huffman decoding technique with wider input data?

I have a wider input data (Byte width) running in my system, and I'm implementing a huffman decoding on this incoming data. Since, the Huffman encoded words don't have the fixed length, hence I need to build a very complex state machine to cover all…
Learner
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xilinx FPGA difference between bitgen and prom compression?

Page 39 of UG161 talks about compression/decompression and implies that either bitgen or prom compression can be used to shorten the config bit stream size. Most importantly I need to know whether, when using the bitgen compression option this means…
Billy M
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IP2 1dB compression point representation and formula

I'm trying to calculate the 1dB compression point in a second order interception. I did find many examples using third order, however, for a second order, I couldn't find much. In Matlab I could find the interception point using the following…
R user
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Dynamic Range Compressor Pedal Operation

A Dynamic Range Compressor works by "clamping" an incoming signal. Above a certain input threshold, the gain of the device is reduced to a lower level. This has the effect of making quieter sounds louder and louder sounds quieter. The circuit below…
Patagonian Rat
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Compression and communication power consumption trade-offs

Let's say I'd like to save battery power consumption when sending data to remote devices connected wirelessly, i.e., sensor networks. One of the ideas may be compressing the data to reduce the number of bytes to send, but the compression process…
prosseek
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Standards for measuring analog audio signal devices

I'm making a Analog Channel Strip for a project. I'm searching for standards that let me or give me an advice of how to measure Dynamic Range, THD and THD+N, SNR, Frequency Response and input/output impedance from an analog compressor, EQ and…
Zlmanuel87
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How to make a circuit to generate a signal to mute a signal and then gradually swell the gain back up?

I assume this is a kind of sidechain insert for a hardware compressor circuit. The application is for electric guitar. The idea is to use a parallel signal chain; one straight signal channel, the other signal channel muting on pick attack, and then…
mr coffee
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1 answer

A few questions regarding the functionality of this negative peak audio detector

I have some queries regarding this peak detector from an audio compressor circuit: My understanding of the process is that when the positive input swings low, D5 is negatively biased and stops conducting whereas D4 is positively biased so the input…
Josh Taylor
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Improve linearity by increasing P1dB by increasing Vds

So I am using MRF6V2150N as power stage and I was using VDS 28V and increased it to 34V. I see that the linearity increased since the P1dB shifted upwards. And this also improved (lowered) the IMD3 cause the ACPR also got better. I want to know if…
уве вонг
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