Questions tagged [dsp]

DSP stands for Digital Signal Processing or Digital Signal Processor.

29 questions with no upvoted or accepted answers
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FIR Lattice Filters

In DSP, sometimes the so-called Lattice Filters are use, having a structure like on this picture: I wonder what the advantages of the Lattice structure are, compared to other FIR filter types and ...
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89 views

How to amplify the output of a digital low pass filter?

I have used the transfer function of a RC low pass filter to design a IIR Digital low pass filter. \begin{equation} H(s)= \frac{1}{sRC+1} ;First \space order \end{equation} \begin{equation} H(s)= \...
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300 views

RC filter - compute output as a function of input for generating waveform

I'm not so deeply into the theory about all this, I may use strange terminology... If I put a square wave through a simple lowpass RC filter, the output will be a sort of "rounded sawtooth", well not ...
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24 views

Converting Clipping stage of guitar pedal to a formula for use in DSP

Been trying to figure out the clipping stage of a tube screamer so i can implement it in a DSP project. I can simulate a clipping effect by using a tanh(input) type function, which gives me an OK ...
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1answer
49 views

Help with Project

[Difference Eqution]: $$LPF_D=\frac{0.1441z^2+0.2881z+0.1441}{z^2-0.6777z+0.254}$$ With a sample of \$T_s = \$ 8e-6 seconds, in scientific E notation. The difference equation: \$Y\$ = Output \$U\$ ...
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38 views

STM32F4 DSP noise with inbuilt ADC and DAC

I'm trying to perform signal filtering with STM32F407VGT. I've set up the ADC and DAC to work synchronously, triggered by a timer at 42kHz, and using DMA. The idea is to process half of the buffer ...
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0answers
42 views

use of DSP ICs in control systems

I'm doing a project on dc motor control. I heard somewhere DSP ICs are widely used in the aforementioned area. My question is about the advantage of using a DSP IC for implementing a PID loop for dc ...
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0answers
54 views

Sampling Frequency of a pulsed radar signal

I'm new to radar. please excuse my question if it doesn't make sense to you. In a pulsed radar signal, why is the required sampling frequency "2 times the inverse of pulse width" instead of "2 times ...
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2answers
101 views

Configuring Frequency Bandwidth and Input Signal for Bandpass filter circuit

How do I set and configure the frequency bandwidth I want the filter to output to a device? I am using a physical passive bandpass filter which I intend to take the signal in and filter it and output ...
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0answers
500 views

Wrong FFT result when using rfft function on STM32F4

I'm trying to use rfft function in STM32F407G and I am getting wrong results when I compare it with an online fft calculator . I give a sample input as {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,...
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73 views

Non equal phase currents at nominal speed vector control Permanent magnet synchronous motor

I working on my implementation of vector control for PMSM. I'm having close loops over speed, current in d axis(flux loop), current in q axis(torque loop). I'm using MATLAB/Simulink for vector control ...
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1answer
453 views

3 phase BLDC sinusoidal drive using PWM controller and/or DSP?

My background is mechanical engineering (robotics). I apologize in advance. I have a sensitive torque ripple (Vibrations) application and would like to use sinusoidal drive to run a 3 phase BLDC ...
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67 views

dsPIC33EP512GP502 -> ADPCM?

It seems that ADPCM is all but non-existant anymore. But I'd like to use this to compress six high-quality audio channels into a smaller bit-stream with little overhead. There seems to be a dsPIC G....
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141 views

RMS calculation of signal with high crest factor up to 10 MHz

I'm attempting to measure the RMS of an AC signal with a crest factor of up to 10, at frequencies of up to 10 MHz. From my brief research I can see many ICs that work well above 100 MHz (designed for ...
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27 views

Design Complex digital Filter in MATLAB

I can implement LPF in MALTAB by any method lets say by exporting MATLAB code from filterDesigner tool which returns a filer object Hd for example so I can see frequency response I want to implement ...
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0answers
19 views

Finding Bluetooth SoC for audio

I'm trying to find a Bluetooth SoC that supports A2DP (at least) and AVRCP. My goal is to connect my phone to this module and have the built-in MCU perform some task when volume commands are received. ...
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0answers
58 views

How to synchronize TI high precision ADC and DAC via SPI?

I am working with DAC80504EVM and ADS8920BEVM-PKD from TI. I am trying to design a system which uses TMDSEVM6657EVM processor board to communicate with these converters via SPI. However, I am trying ...
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1answer
46 views

Is it possible to digitize small signal with large noise?

I have a small signal, e.g. ~100 uV in a band of interest of 0.1 - 30.0 Hz This signal is accompnied with a huge noise of 50 Hz ~100V of amplitude. ADC's input range is 1V. Is it possible to ...
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1answer
39 views

How can this problem be solved with partial fractions? (Zero order holder with g(s) block function)

im trying to figure out how to solve this problems for values a=2; actually im stuck, professor told me how to work it, but i cant figure out what to do exactly, we are using partial fractions inverse ...
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0answers
38 views

Implementing WOLA block for ADC data on FPGA

I have ADC (ads5463) connected to an FPGA (lattice ecp3) using Verilog, and I have built an ADC interface on the fpga which capturing the data sucessfully and stores the data on FIFO. My next step is ...
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39 views

Filtering analog audio signal using TLV320AIC3111-EVM

I'm working on a project to filter analog microphone data using the audio codec from TI, the TLV320AIC3111. We are using the EVM However, I'm facing problems with implementing the filters on the ...
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1answer
75 views

Translating/reverse engineering firmware commands

I'm trying to build my own Hi-Fi system. So, I recently ordered this Japanese DSP that's able to process Dolby audio. I was all excited until the part had arrived and I found something in the ...
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111 views

Time delay using IIR filters

I am trying to implement a cardioid pattern with two microphones. I was reading this paper titled "Digital Filter Array Optimization for Directivity Pattern". The link to download the paper is this. ...
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2answers
73 views

Load vs LDAC pins

Alright, so I'm using a TLV5628 Octal 8 bit DAC with my stm32f4-Nucleo and I'm kind of confused about the difference between LDAC and Load. I am also trying to figure out the clock rate and I might ...
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1answer
42 views

Can I2S tdm interface send more channels with less sampling frequency?

We have a arm SoC(system on chip) connected with I2S to a DSP (digital signal processor). SoC and DSP both support 48khz, 8 channel and 16bits in TDM mode. Is it possible to use this interface to ...
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170 views

How to change step pulses into PWM pulse synchronously?

I am driving a stepper motor using microstepping techniques. For the input signals to the driver, step and dir are used. More than 100,000 steps/second speed is target. The PWM frequency is below ...
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1answer
430 views

Anti-Aliasing Filter example

I need help in solving the below question. Bandwidth of the signal is 1KHz. Use a 12-bit ADC with SNR of 78dB for sampling. the sampling frequency is 12KHz. Choose suitable filter order and cut-off ...
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1answer
40 views

DSP board TMDX5505EZDSP potentiometers and switches

I have to do a project for school that is an audio effects processor but I'm not experienced with dsp. I'm using the Texas Instruments TMDX5505EZDSP. I've programmed some audio effects based on some ...
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0answers
103 views

FIR Filter delay calculation for cascaded filters

I have created a simulink model which had two filters implemented with an FIR block cascaded in series. The first filter in my case is a moving average filter and the second one a Gaussian filter(...