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How do I downsample a signal using Octave?
I have been trying to downsample a signal, but I'm not sure if I have the proper command? can you give me the proper command with a brief explanation?
matlab octave
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
add a comment |
I have been trying to downsample a signal, but I'm not sure if I have the proper command? can you give me the proper command with a brief explanation?
matlab octave
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
1
Try theresamplefunction from thesignalpackage: octave.sourceforge.io/signal/function/resample.html
– am304
Nov 19 '18 at 13:03
add a comment |
I have been trying to downsample a signal, but I'm not sure if I have the proper command? can you give me the proper command with a brief explanation?
matlab octave
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
I have been trying to downsample a signal, but I'm not sure if I have the proper command? can you give me the proper command with a brief explanation?
matlab octave
matlab octave
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
asked Nov 19 '18 at 12:48
Mary ProgrammerWant2Be
85
85
1
Try theresamplefunction from thesignalpackage: octave.sourceforge.io/signal/function/resample.html
– am304
Nov 19 '18 at 13:03
add a comment |
1
Try theresamplefunction from thesignalpackage: octave.sourceforge.io/signal/function/resample.html
– am304
Nov 19 '18 at 13:03
1
1
Try the
resample function from the signal package: octave.sourceforge.io/signal/function/resample.html– am304
Nov 19 '18 at 13:03
Try the
resample function from the signal package: octave.sourceforge.io/signal/function/resample.html– am304
Nov 19 '18 at 13:03
add a comment |
2 Answers
2
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oldest
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Depending on what you are trying to achieve, the downsample can be enough.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = downsample(x, 2);
However, it will not apply a low-pass filter so it can introduce unwanted aliasing effects on your signal. Like the command help downsample says:
For most signals you will want to use
decimateinstead since it prefilters the high frequency components of the signal and avoids aliasing effects.
Now if you want to downsample and apply the low-pass filter, you would like to use decimate but it only works for a downsampling with an integer factor, for example from 96kHz to 48kHz, you decimate by a factor 2. From help decimate
Note that Q must be an integer for this rate change method.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = decimate(x, 2);
Finally, if you want to downsample by a rational number, for example by a factor of 2/3, from 96kHz to 64kHz, you will need resample like it was suggested by other users.
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = resample(x, 2, 3);
Note that you can still use resample to downsample by an integer factor, for example y = resample(x, 1, 2); but it slower that decimate.
answered Nov 21 '18 at 13:23
Bebs
87231023
add a comment |
e.g.
y=resample(x,L,M);
.
.
x--> your signal
L--> increase sampling rate
M--> reduce sampling rate
answered Nov 19 '18 at 15:59
Nima
1
do I have to declare L and M or is it just apart of the code?
– Mary ProgrammerWant2Be
Nov 19 '18 at 16:12
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Depending on what you are trying to achieve, the downsample can be enough.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = downsample(x, 2);
However, it will not apply a low-pass filter so it can introduce unwanted aliasing effects on your signal. Like the command help downsample says:
For most signals you will want to use
decimateinstead since it prefilters the high frequency components of the signal and avoids aliasing effects.
Now if you want to downsample and apply the low-pass filter, you would like to use decimate but it only works for a downsampling with an integer factor, for example from 96kHz to 48kHz, you decimate by a factor 2. From help decimate
Note that Q must be an integer for this rate change method.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = decimate(x, 2);
Finally, if you want to downsample by a rational number, for example by a factor of 2/3, from 96kHz to 64kHz, you will need resample like it was suggested by other users.
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = resample(x, 2, 3);
Note that you can still use resample to downsample by an integer factor, for example y = resample(x, 1, 2); but it slower that decimate.
answered Nov 21 '18 at 13:23
Bebs
87231023
add a comment |
Depending on what you are trying to achieve, the downsample can be enough.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = downsample(x, 2);
However, it will not apply a low-pass filter so it can introduce unwanted aliasing effects on your signal. Like the command help downsample says:
For most signals you will want to use
decimateinstead since it prefilters the high frequency components of the signal and avoids aliasing effects.
Now if you want to downsample and apply the low-pass filter, you would like to use decimate but it only works for a downsampling with an integer factor, for example from 96kHz to 48kHz, you decimate by a factor 2. From help decimate
Note that Q must be an integer for this rate change method.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = decimate(x, 2);
Finally, if you want to downsample by a rational number, for example by a factor of 2/3, from 96kHz to 64kHz, you will need resample like it was suggested by other users.
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = resample(x, 2, 3);
Note that you can still use resample to downsample by an integer factor, for example y = resample(x, 1, 2); but it slower that decimate.
answered Nov 21 '18 at 13:23
Bebs
87231023
add a comment |
Depending on what you are trying to achieve, the downsample can be enough.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = downsample(x, 2);
However, it will not apply a low-pass filter so it can introduce unwanted aliasing effects on your signal. Like the command help downsample says:
For most signals you will want to use
decimateinstead since it prefilters the high frequency components of the signal and avoids aliasing effects.
Now if you want to downsample and apply the low-pass filter, you would like to use decimate but it only works for a downsampling with an integer factor, for example from 96kHz to 48kHz, you decimate by a factor 2. From help decimate
Note that Q must be an integer for this rate change method.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = decimate(x, 2);
Finally, if you want to downsample by a rational number, for example by a factor of 2/3, from 96kHz to 64kHz, you will need resample like it was suggested by other users.
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = resample(x, 2, 3);
Note that you can still use resample to downsample by an integer factor, for example y = resample(x, 1, 2); but it slower that decimate.
answered Nov 21 '18 at 13:23
Bebs
87231023
Depending on what you are trying to achieve, the downsample can be enough.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = downsample(x, 2);
However, it will not apply a low-pass filter so it can introduce unwanted aliasing effects on your signal. Like the command help downsample says:
For most signals you will want to use
decimateinstead since it prefilters the high frequency components of the signal and avoids aliasing effects.
Now if you want to downsample and apply the low-pass filter, you would like to use decimate but it only works for a downsampling with an integer factor, for example from 96kHz to 48kHz, you decimate by a factor 2. From help decimate
Note that Q must be an integer for this rate change method.
Example code:
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = decimate(x, 2);
Finally, if you want to downsample by a rational number, for example by a factor of 2/3, from 96kHz to 64kHz, you will need resample like it was suggested by other users.
pkg load signal % To download the signal package
x = cos(1:1000); % Create a signal
y = resample(x, 2, 3);
Note that you can still use resample to downsample by an integer factor, for example y = resample(x, 1, 2); but it slower that decimate.
answered Nov 21 '18 at 13:23
Bebs
87231023
edited Nov 21 '18 at 15:31
answered Nov 21 '18 at 13:23
Bebs
87231023
answered Nov 21 '18 at 13:23
Bebs
87231023
answered Nov 21 '18 at 13:23
Bebs
87231023
87231023
add a comment |
add a comment |
e.g.
y=resample(x,L,M);
.
.
x--> your signal
L--> increase sampling rate
M--> reduce sampling rate
answered Nov 19 '18 at 15:59
Nima
1
do I have to declare L and M or is it just apart of the code?
– Mary ProgrammerWant2Be
Nov 19 '18 at 16:12
add a comment |
e.g.
y=resample(x,L,M);
.
.
x--> your signal
L--> increase sampling rate
M--> reduce sampling rate
answered Nov 19 '18 at 15:59
Nima
1
do I have to declare L and M or is it just apart of the code?
– Mary ProgrammerWant2Be
Nov 19 '18 at 16:12
add a comment |
e.g.
y=resample(x,L,M);
.
.
x--> your signal
L--> increase sampling rate
M--> reduce sampling rate
answered Nov 19 '18 at 15:59
Nima
1
e.g.
y=resample(x,L,M);
.
.
x--> your signal
L--> increase sampling rate
M--> reduce sampling rate
answered Nov 19 '18 at 15:59
Nima
1
answered Nov 19 '18 at 15:59
Nima
1
answered Nov 19 '18 at 15:59
Nima
1
answered Nov 19 '18 at 15:59
Nima
1
1
do I have to declare L and M or is it just apart of the code?
– Mary ProgrammerWant2Be
Nov 19 '18 at 16:12
add a comment |
do I have to declare L and M or is it just apart of the code?
– Mary ProgrammerWant2Be
Nov 19 '18 at 16:12
do I have to declare L and M or is it just apart of the code?
– Mary ProgrammerWant2Be
Nov 19 '18 at 16:12
do I have to declare L and M or is it just apart of the code?
– Mary ProgrammerWant2Be
Nov 19 '18 at 16:12
add a comment |
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1
Try the
resamplefunction from thesignalpackage: octave.sourceforge.io/signal/function/resample.html– am304
Nov 19 '18 at 13:03