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# Star Rats

##### Last seen: 24 jours ago
11 total contributions since 2019

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Question

How is the quality of audio file when PSNR is more than 48?
I decoded an mp3 file and save as wav file. Then I compared the two audio files (mp3 & wav) by using PSNR matlab (coding shown b...

4 mois ago | 1 answer | 0

### 1

Question

How to calculate PSNR in Matlab Figure file?
I wish to calculate the PSNR between two signals. The input file would be Matlab Figure file. signal1 = openfig('Figure1.fig...

4 mois ago | 1 answer | 0

### 1

Question

How to solve the communication overhead between the labindex?
I have implemented the spmd function according to this post. It did improve the performance. However, it also generates a seri...

5 mois ago | 0 answers | 0

### 0

Question

How to filter data using rmoutliers?
To remove data above 1.2 and below -1.2. I use: threshold = [-1.2, 1.2]; y = rmoutliers(y,'percentiles',threshold); But erro...

7 mois ago | 1 answer | 0

### 1

Question

Difference in frequency domain between mp3 and wav
I have plotted the frequency domain figure for mp3 and wav as shown in Figure below. They are in dotted blue and dark orange re...

9 mois ago | 1 answer | 0

### 1

Question

What can I know from the spectrogram of mp3 and wav file
I have plotted the spectrogram for an audio in mp3 and wav file as shown in Figure 1 and 2 respectively. Does it means that wa...

9 mois ago | 1 answer | 0

### 1

Question

How to find the mean peaks in positive axis
I wish to find the mean of all peaks from the positive axis in Figure 1. I tried pks = findpeaks(y); but it includes ...

10 mois ago | 2 answers | 0

### 2

Question

How to improve bit reading process in Matlab?
I need to read a binary file and the Matlab coding is: a = uint8(fread(fid,'ubit1')'); This is inefficient so I added a line b...

11 mois ago | 0 answers | 0

### 0

Question

Why the decoding time is long compared to other methods?
I have run the mp3 decoding based on the coding provided here. Why it takes around 20 minutes to decode a 3.6MB mp3 file while o...

12 mois ago | 1 answer | 0

### 1

Question

How does labindex in spmd works?
Based on the spmd labindex coding provided by @Walter Roberson here, I wonder when do the following labindex (labindex 2, 3 and ...

12 mois ago | 1 answer | 0