# Tagged Questions

DSP stands for Digital Signal Processing or Digital Signal Processor.

51 views

### How do we balance an FIR around its center?

How do we balance an FIR around its center? I was asked this question in an interview. What does this mean? Is the center point the point corresponding to the peak of impulse response?
66 views

### How to create a control loop using a 100Msps digital signal as input

I would like to know what type of microcontroller should I buy for this control loop task. Scenario: I have a digital signal coming from the following equipment: UPDATE ::::: Ultrasonic ...
46 views

### Magnitude of fourier transform of AM signal

I'm taking a basis course in DSP and in class we had an exercise on amplitude modulating signal. we were given a signal $x(t)$ with fourier transform $X^F (f)$ with magnitude which looks like this:...
80 views

### eliminating audio hum

I'm working on a circuit that feeds a microphone into the ADC of the STM32F4 Discovery and then outputs that exact signal out of the microcontroller's DAC and then to a headphone jack. I am able to ...
21 views

### MATLAB using rand to test for time invariance

So I am given a certain system: y(n) = 10x(n)cos(0.25pi*n + 0.1pi) And I am to test if the system is time invariant by plotting two input signals x(n) and x(n-2), and their corresponding output ...
37 views

### Sharp and Simple Analog Filter suggestions

I'm looking for schematics of some simple opamp-based analog filter, which has a sharp band-pass functionality. I want it to control small robot with sounds of different pitch. The matter is like ...
53 views

### FFT Bin Problem with external 24 Bit ADC(FFT bins changing with time)

Currently I am working on one project that includes 24 Bit external MCP3919 and MCP3914 ADCs and Tiva C series 32 Bit MCU. I am trying to calculate harmonic values of input signal. I am using CMSIS ...
69 views

### how i can get 5V AC output from 230V AC [closed]

how can'i get 5 V AC output 230 V AC: input? for a measurement unit bases on DSP?
82 views

### Digital filter implementation in C (embedded)

I am a recent grad and my new project at work deals with taking the signal from an electret microphone and getting SPL values for 10 standard frequency bands. The analog amplification/conditioning is ...
78 views

### Comparison between FMCW radar modulation techniques

In designing a Frequency modulated continuous wave (FMCW) radar system for target detection, there is a possibility of choosing the modulation technique amongst triangle or saw-tooth modulation. What ...
55 views

### What is name of process used to change sample bit depth?

Changing sampling rate is called up sampling or down sampling depending on which way or is done. If the factor is an even number then the process becomes very simple. However, what term is used to ...
61 views

### Flattening microphone's frequency response

It is typical for a microphone to have a non-flat frequency response like so: Is it typical to flatten the response curve by weighting the signal in frequency domain to get the most accurate ...
84 views

### DSP applications for Hysterisis [closed]

How is hysteresis used for DSP?
64 views

### Audio DSP for hobbyists

I'm several years away from finishing an EE degree and have yet to get any exposure to DSP. The few texts I've cracked open pre-suppose a level of sophistication i'm not at yet. Is there some stepping ...
70 views

### FreeDSP (ADAU1701) isn't working - what is the issue?

I had FreeDSP PCB soldered recently and for the last two days I've been struggling to make it work. FreeDSP basically consists of ADAU1701 DSP, 24LC256 EEPROM, 12 MHz oscillator, IO circuits and ...
47 views

### What are the (mathematical) restrictions of a TMS320C6713 DSP?

I have a function that computes the sum of even numbers in a Fibonacci sequence less than a boundary. Should I be worried about this calculation? Can the TMS320C6713 handle it? When I run the ...
44 views

### How to lower volume on microphone input before outputting through headphones? (Using a DSP) [closed]

As part of a senior engineering course, my partner and I decided on tackling the problem of hearing loss in youth, and went with a more preventative approach, trying to reduce the amount of cases ...
69 views

### Given the system function, how can i tell if it is a lowpass or a highpass filter? [duplicate]

If i am given the system function of a FIR digital filter obtained by recursive frequency sampling design procedure., how can i tell if it is a lowpass, highpass, or bandpass filter?
124 views

### How to improve my digital filter to extract DC from noises?

Digital filter description: The filter's input are sensor data and output will be provided to a PID controller. Sampling rate: 64kHz Noises spectrum: from DC to 10kHz Filter target: to get DC ...
178 views

### TMS320 Floating Point (Texas Instruments DSP from '98)

Background Is there anybody here who is an EE with programming experience who has worked with the Texas Instruments TMS320 C3X-series DSP? I am currently doing some work with the C3X for a project. ...
87 views

### Vacuum tubes versus solid state in specialist audio [closed]

There is obviously a large body of opinion that believes the use of vacuum tube amplifiers enhances some types of music. My question is simple: Given that modern DSP techniques can mimic just about ...
73 views

### Digital Signal processing-Sampled period

Please can you help me with exam test preparation. I have take the below past year exam paper. I want to know if I am on the correct track and my answers are correct. x(t) = cos(50.pi.t + 30) ...
172 views

### Different ways of using DSP slices in Spartan 6 FPGA

I am reading the Spartan 6 DSP slice user guide, and I need to use the DSP slice in a project of mine. I stumbled upon this question, which basically suggests 3 ways of using the DSP slices 1) ...
56 views

### Where to find comprehensive motor control learning material? [closed]

I have ARM cortex-M/cortex-A software/hardware development team. My work involves many Linux drivers, BSPs and tuning for ARM hardware. Recently, one of my friend has started BLDC motor ...
31 views

### Why do half-band filters form orthonormal bases?

I'm studying wavelet transforms and ran across this little gem, but I can't visualize why a half-band filter would form orthogonal bases of the original signal and the mother. Any insights would be ...
80 views

### How to design the frequency response of an analog filter when I get the transfer function?

I am not trying to design a filter. I just want to understand the theory of laplace transform and s-domain.I read an example from the book The Scientist and Engineer's Guide to Digital Signal ...
116 views

### BPSK modulator with DDS on FPGA

I was developing a BPSK modulator with an AD9852. Since AD doesn't seem to offer any way to functionally simulate their DDS ICs, suddenly i see myself in the need to change for a FPGA architecture. I ...
60 views

### band pass filter on solar cell to detect laser

my target is detecting a laser generated with 1k frequency using a solar cell, i'm using this idea which is using a band pass filter on the solar cell to block the dc sun light and let me detect the ...
142 views

### Are FPGAs more intuitive to learn than microprocessors for doing DSP

I want to learn to make DSP hardware I have never done any DSP and only a little bit of programming, but I have been making analog circuits for 15 years. I like the idea of learning FPGAs because it ...
148 views

### Use LCD 1602A with F28027

158 views

I have a simple radar module (k-band) that is capable of fm modulation and it provides both I and Q as baseband outputs. I like to extend the measurement range of this module by just signal processing ...
84 views

### Understanding the DTFT

So I am taking a signal processing course in EE and my professor is an Engineer who really likes math however his book which we use for the class falls in the dreadful purgatory of math books in my ...
90 views

### Are TI TMS320C6x and TI TMS320C2x compatible?

I never learnt assembly language programming. But, I know C and C++. I need to learn C2000 Piccolo programming. I found no book on C2000, there are only manuals from TI website. But, suddenly, I ...
35 views

### How many ePWM instances are there in a TMS320C28x Piccolo DSP chip?

In this reference manual, it is written that: [Page 11] 1 Introduction ...... Cross coupling or sharing of resources has been avoided; instead, the ePWM is built up from smaller single ...
120 views

### Cannot understand the attenuation in signal from PC to microcontroller(NI myRIO)

I am working on Active Noise Cancellation Project. I came across a problem, where the signal is getting attenuated as the audio bit depth changes from PC data to Microcontroller and I cannot ...
132 views

### 256-point FFT, but only need 5-6 frequencies, is there a better way?

Due to the constraints of my system, I have a 256pt FFT. However, I only care about the energy at 5 or 6 of the 256 bins. 256pt FFT is still faster than 5 or 6 specific DFTs, but it seems wasteful ...
40 views

### TMS320F28335 Offset Error Correction

I work with TMS320F28335.The 2833x ADC supports offset correction via a 9-bit field in the ADC Offset Trim Register(ADCOFFTRIM).I read the ti 2833x ADC reference guide(page 31),but I don't understand ...
462 views

### What is the meaning of my fourier transform results?

I've been experimenting with Fourier transforms, and I'd like to understand some of the results I'm seeing. I've written a simulator which generates a data stream of length 1/120 seconds, sampled at ...
248 views

### Discrete signals: Power and Energy after Up/Downsampling

I think I have a very simple question, but I am very confused about it right now. Given is a discrete sequence $x[n]$, for simplicity we say its finite and of length $N$. Then we know that the ...
139 views

### Jumping from microcontroller to DSPs

I have been using microcontroller like ARM Cortex M4 32bit based microcontrollers. Now I am thinking to move towards DSPs, but I really don't know how things work in Processors and DSPs, I mean in ...
97 views

### Digital guitar effect / DSP [closed]

I have to design and create a MCU device as a project for my university. I would like to create a real-time digital guitar effect, which should have a decent sound quality. I don't have any real ...
417 views

### Transmitting data from MATLAB to FPGA

This is about design of a JPEG compression/decompression scheme on an Altera FPGA. It is possible to have camera or SD card for image input and TV or SD card for image output. However, these ...
107 views

### Combining the outputs of multiple SPI devices

I have a project that has an array of digital microphones whose output I would like to perform some fancy signal processing on, using a high-powered ARM micro-processor. I like the idea of using ...
54 views

### Sampling frequency range of an discrete signal

Is it possible to detect each and every frequency above the nyquist frequency? Or this can be also discrete Thank you.
100 views

### Can I implement a FM Radio Rx on the the Spartan 3E kit?

Can I implement a FM Radio Rx on the the Spartan 3E kit? Starting Problems I am facing- How do I interface the Antenna with the Spartan 3E kit? Implementing the A/D converter.
102 views

### Distinguishing between FIR and IIR filters from transform function

I was good at this but unfortunately I have forgot almost everything... So the question is what are the steps to tell if a transform function is for IIR or FIR filter: H(z) = \frac{z^3+5z^2+3z+1}{...
47 views

### TSP65070 and OMAP 1V8 pull up to 2.7V

I want to use the TPS65070, the power solution for DSP to power the OMAP L138, but i read in the errata sheet of the OMAP L138 OMAP L138 Errata page 25 that the 1V8 power supply can pull up to 2.7V ...
326 views

### Is there an audio amplifier chip or circuit that amplifies certain amplitudes in a signal less or more than other amplitudes?

Like for instance, that would amplify on an exponential curve where the lower amplitudes get the maximum amplification and the highest amplitudes would get no amplification? Is there an analog chip ...