audio i/o and waveform generation -凯发k8网页登录

record and play audio from devices, read and write audio files, generate waveforms

audio toolbox™ enables real-time audio input and output. using the enhanced functionality of audio toolbox audio i/o, you can interact with the low-latency asio™ driver on windows^®, selectively map to and from device channels, and control your device bit depth. to manage a database of audio files, use audiodatastore.

you can also generate tunable periodic waveforms to create test signals, control signals, and your own unique sounds.

functions

audio file i/o

`audiodatastore`	datastore for collection of audio files
	stream to audio file
	stream from audio file
	compute envelope of an audio file

audio device i/o

	simultaneously play and record using an audio device
	record from sound card
	play to sound card
	open settings panel for asio driver
	list available audio devices

waveform generation

	generate sine, square, and sawtooth waveforms
	generate periodic signal from single-cycle waveforms
	generate pink noise

blocks

	record from sound card
	play to sound card
	stream from multimedia file
	stream video frames and audio samples to multimedia file
	generate periodic signal from single-cycle waveforms
	generate sine, square, and sawtooth waveforms
	generate colored noise signal

topics

real-time audio in matlab
create a script to process and analyze real-time audio signals.
audio i/o: buffering, latency, and throughput
learn key terminology and basic techniques for optimizing stream processing algorithms.
plot large audio files in matlab using the audio envelope.

featured examples

measure audio latency

measure the latency of an audio device. the example uses audiolatencymeasurementexampleapp which in turn uses audioplayerrecorder along with a test signal and cross correlation to determine latency. to avoid disk access interference, the test signal is loaded into a dsp.asyncbuffer object first, and frames are streamed from that object through the audio device.

thd n measurement with tone-tracking

measure total harmonic distortion and noise level of audio input and output devices.

measure impulse response of an audio system

the impulse response (ir) is an important tool for characterizing or representing a linear time-invariant (lti) system. the impulseresponsemeasurer enables you to measure and capture the impulse response of audio systems, including:

measure frequency response of an audio device

the frequency response (fr) is an important tool for characterizing the fidelity of an audio device or component.