info
Get cumulative overrun and underrun
Syntax
Description
Examples
Read Variable Frame Sizes from Buffer
The dsp.AsyncBuffer
System object™ supports reading variable frame sizes from the buffer.
Create a dsp.AsyncBuffer
System object. The input is white Gaussian noise with a mean of 0, a standard deviation of 1, and a frame size of 512 samples. Write the input to the buffer using the write
method.
asyncBuff = dsp.AsyncBuffer;
input = randn(512,1);
write(asyncBuff,input);
plot(input)
hold on
Store the data that is read from the buffer in outTotal
.
Plot the input signal and data that is read from the buffer in the same plot. Read data from the buffer until all samples are read. In each iteration of the loop, randi
determines the number of samples to read. Therefore, the signal is read in as a variable-size signal. The prevIndex
variable keeps track of the previous index value that contains the data.
outTotal = zeros(size(input)); prevIndex = 0; while asyncBuff.NumUnreadSamples ~= 0 numToRead = randi([1,64]); out = read(asyncBuff,numToRead); outTotal(prevIndex+1:prevIndex+numToRead) = out; prevIndex = prevIndex+numToRead; end plot(outTotal,'r') hold off
Verify that the input data and the data read from the buffer (excluding the underrun samples, if any) are the same. The cumulative number of overrun and underrun samples in the buffer is determined by the info
function.
S = info(asyncBuff)
S = struct with fields:
CumulativeOverrun: 0
CumulativeUnderrun: 28
The CumulativeUnderrun
field shows the number of samples underrun per channel. Underrun occurs if you attempt to read more samples than available.
Input Arguments
asyncBuff
— Async buffer
dsp.AsyncBuffer
System object
dsp.AsyncBuffer
Async buffer, specified as a dsp.AsyncBuffer
System object.
Output Arguments
S
— Cumulative overrun and underrun information
structure
Cumulative overrun and underrun information, returned as a structure. The fields for
S
are described in the table.
Field | Value |
---|---|
CumulativeOverrun
| Number of samples overrun per channel since last call to
|
CumulativeUnderrun | Number of samples underrun per channel since last call to
|
The CumulativeOverrun
and
CumulativeUnderrun
properties are data type
int32
.
Version History
Introduced in R2017a
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