# All Questions

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### modulation & demodulation of GPS output digital data

I need to add GPS digital output (in form of Lat/Long) in an existing analog audio signal whose bandwidth is 100 Hz-20 KHz. This GPS data should be added in such a way that it should not interfere ...
9 views

### Derivation of Shannon Limit for soft and hard decoders

I've been reading up on some design considerations for FECs, and have been trying to derive a theoretical bound for performance of a FEC. I have found the following sources, with these images From ...
28 views

### Why do we care about the STFT of a signal?

As far as I know, the STFT is used to analyze the frequency content of a non-stationary signal - a signal whose frequency varies with time. For example, a signal like this: - Performing the DFT on ...
• 416
27 views

### Time domain expression of a stationary continous broadband signal and its autocorrelation

I want to find the auto-correlation of a stationary continous broadband signal. The auto-correaltion is $$f\star f=\int_{-\infty}^\infty f^*(t)f(t+\tau)\ \mathrm{d}t.\tag{*}\label{*}$$ The power ...
8 views

• 113
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### Recreating waves/sound given a frequency spectrum?

I'm currently working on a project with a decibel meter capable of measuring the frequency spectrum of a given sound. It gives it in the form of 64 bands from 0 Hz - 8 kHz (250 Hz increments) and I'm ...
14 views

### How does one demodulate a signal correctly in python using komm.dev library?

Im not sure if I need to downsample or filter but as of now this code has a 45% bit error rate and I need to understand how to correctly demodulate something like this coming off an SDR. Thanks! ...
35 views

### For a symmetric FIR filter, can the number of coefficients be even and half of the filter order?

I'm trying to use an assembly DSP library (TriLib by Infineon) and for one of the FIR functions, FirSym_4_16, the implementation has the following constrains: Number of coefficients given by user ...
53 views

### High pass filter with narrow stop band and low group delay over part of passband

Consider the following filtering requirements for a nominally high pass IIR or FIR filter (assume a sample rate of $F_s =1$): Stopband: $f\in[0, 0.00144]$ -- looking for around 20dB attenuation ...
• 489
47 views

### How come when I plot the psd of a signal using welch the signal looks like it spans all frequencies instead of being a bump?

something like: ...