# Questions tagged [floating-point]

The tag has no usage guidance.

19 questions
Filter by
Sorted by
Tagged with
92 views

### Implementation of CIC filter using floating point

I am trying to implement a CIC filter and was reading through the literature and found that CIC filter cannot be implemented using floating point. I am unable to understand why that would happen. The ...
79 views

### Is multiplying by Ts faster than dividing by fs? [closed]

Say fs = 1000 and Ts = 0.001. Would it be faster to compute Ts at the beginning and subsequently multiply by 0.001 instead of dividing by 1000 when computing frequency-dependent quantities?
101 views

### Mitigate floating-point numerical errors for very-low corner frequency low-pass filter with DSP

I'm designing a low-pass filter for a digital signal processing application that ideally just passes a very small bandwidth above DC. I'm using an IIR biquad filter for this, where the coefficients ...
473 views

### Single pole IIR filter, fixed point design

We want to do a fixed point implementation of the single pole IIR filter: $y[n] = a\cdot x[n] + (1 - a)\cdot y[n-1] \quad ;\qquad 0<a<1$ What are the main design considerations to think about ?...
3k views

### Why is there no FPU on (most) DSP chips?

Why is there no FPU (Floating Point Unit) on most DSP chips? I found several answers such as this one that explain advantages of fixed point approach such as smaller power consumption, higher speed ...
193 views

### PSNR calculation with float arrays

The PSNR definition provided by wikipedia is often quoted in discussions regarding PSNR and other similarity metrics. Essentially the PSNR calculation has two components: the mean squared error and ...
628 views

### Conversion from Floating point representation to Fixed point representation

I have written a matlab function for a constellation mapper and I want to create a Fixed-point version of that code for implementation on FPGA. I know matlab has a specific toolbox for fixed-point ...
2k views

### How to avoid denormalized numbers?

The same floating-point AMD X86-64 digital signal processing system mentioned in my previous question has a problem where it sometimes slows down substantially when signals attain values very near (...
2k views

### Finding a signal inside another signal

I have a 1D array of 32 bit floating point numbers representing the current draw of a radio operating over a 40 minute span. The number of elements in the array is 29 million and change. There is a ...
69 views

### Audio Bit Depth “mapping” from DAW to Audio card: is this correct?

Let say I'm generating a 1 kHz sine wave within my DAW, using some synth (Sytrus in my case). I normalize it, so it play at max "digital" amplitude 0db. Thus, any sample of the signal would gets a ...
833 views

### Artifacts signal conversion from float to integer

I have a script where i want to change the noise floor to about 96 dB (visual purpose). The script containing basically a sine wave with after wart do FFT over it. The script is in python and as ...
483 views

### How to convert floating point code to fixed point?

I am working on converting a floating point MATLAB code into fixed point C code. The code is to be run on a DSP platform, the specifics of which are yet to be decided. I'm new to floating point to ...
14k views

### Understanding Q formats

I have some misunderstandings with Q format. Please help me in understanding this. If I say Q8 [unsigned] then there will be $8$ fractional bits. Is it ? How can I represent a $1$ and $1.5$ in this ...
269 views

### In image compression using transforms, how to deal with the transformed coefficients as they are not integers?

I am new to the field of image compression. While going through various texts, I read about how transforming the image to another domain using, for example, the wavelet transform, or the DCT, makes it ...
44 views

### Basic question on numerical precision [closed]

I appreciate this opportunity to submit a query on this forum. When studying the continuous-time & discrete-time distinction, specifically with reference to discrete signals being identical when ...
1k views

### Applying a FIR filter to floating point array c# [closed]

I have designed using MATLAB a FIR filter with some coefficients. I have an array that is normalized to -+1. The array is float. I used this method to apply the FIR to the array but I'm not sure if ...
3k views

### Downsampling PCM Audio

I'm looking everywhere for solutions for audio downsampling. However for one reason or another they are incomplete, sometimes buggy, and sometimes are in a programming language I cannot understand. ...