www.gusucode.com > dsp 案例源码程序 matlab代码 > dsp/ReduceLatencyDueToOutputDeviceBufferExample.m

    %% Reduce Latency due to Output Device Buffer
% Modify default properties of your |audioDeviceWriter| System object(TM)
% to reduce latency due to device buffer size.

%%
% Create a |dsp.AudioFileReader| System object to read an audio file with
% default settings.
fileReader = dsp.AudioFileReader('speech_dft.mp3');

%%
% Create an |audioDeviceWriter| System object and specify the sample rate
% to match that of the audio file reader.
deviceWriter = audioDeviceWriter(...
    'SampleRate',fileReader.SampleRate);

%%
% Calculate the latency due to your device buffer, in seconds.
bufferLatency = fileReader.SamplesPerFrame/deviceWriter.SampleRate

%%
% Set the |SamplesPerFrame| property of your |dsp.AudioFileReader| System
% object to 256. Calculate the buffer latency in seconds.
fileReader.SamplesPerFrame = 256;
bufferLatency = fileReader.SamplesPerFrame/deviceWriter.SampleRate