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Examples

Read from Microphone and Write to Speaker

Examine the Audio Device Reader block in a Simulink® model, modify parameters, and explore overrun.

Open Model

Ports

Output

expand all

A—Output signal
scalar | vector | matrix

The output of theAudio Device Readerblock is determined by the block’s parameters. If the block output is a matrix, the columns correspond to independent channels.

Data Types:single|double|int16|int32|uint8

O—Number of samples overrun
scalar

This port outputs the number of samples overrun while acquiring a frame of data (one output matrix).

Dependencies

To enable this port, select theOutput number of samples overrunparameter.

Data Types:uint32

Parameters

expand all

Main Tab

Driver—Driver used to access your audio device
`DirectSound`(default) |`ASIO`|`WASAPI`

ASIO drivers do not come pre-installed on Windows machines. To use theASIOdriver option, install an ASIO driver outside of MATLAB^®.

Note

IfDriveris set toASIO, open the ASIO UI outside of MATLAB to set the sound card buffer size to the value specified by theSamples per frameparameter. See the documentation of your ASIO driver for more information.
WASAPI drivers are supported for exclusive-mode only.

ASIO and WASAPI drivers do not provide sample rate conversion. For ASIO and WASAPI drivers, setSample rate (Hz)to a sample rate supported by your audio device.

This parameter applies only on Windows machines. Linux machines always use the ALSA driver. Mac machines always use the CoreAudio driver.

Device—Device used to acquire audio samples
default audio device (default)

The device list is populated with devices available on your computer.

Info—View information about your audio input configuration
button

This button opens a dialog box that lists your selected audio driver, the full name of your audio device, and the maximum input channels for your configuration. For example:

Sample rate (Hz)—Sample rate your device uses to acquire audio data
`44100`(default) | integer

The possible range ofSample rate (Hz)depends on your audio hardware.

Number of channels—Number of channels acquired by your audio device
`1`(default) | integer

The number of input channels is also the number of channels (matrix columns) output by theAudio Device Readerblock.

Dependencies

指定输入通道音频设备acquires, on theAdvancedtab, select theUse default channel mappingparameter.

Samples per frame—Frame size read from audio device
`1024`(default) | integer

Samples per frameis also the device buffer size, and the frame size (number of matrix rows) output by theAudio Device Readerblock.

Advanced Tab

Device bit depth—Data type used by device to acquire audio data
`16-bit integer`(default) |`8-bit integer`|`16-bit integer`|`24-bit integer`|`32-bit integer`

Data type used by device to acquire audio data, specified as a character vector or string.

Use default channel mapping—Toggle channel mapping source
on (default) | off

When you select this parameter, the block uses the default mapping between the sound card’s input channels and the matrix columns output by this block. When you clear this parameter, you specify the mapping inDevice input channels.

Device input channels—Specify nondefault channel mapping
`[1:MaximumInputChannels]`(default) | scalar | vector

Nondefault map of device channels and matrix output by theAudio Device Readerblock, specified as a scalar or vector. For example:

IfDevice input channelsis specified as1:3, then:

Channel 1 maps to the first column of the output matrix.
Channel 2 maps to the second column of the output matrix.
Channel 3 maps to the third column of the output matrix.

IfDevice input channelsis specified as[3,1,2], then:

Channel 3 maps to the first column of the output matrix.
Channel 1 maps to the second column of the output matrix.
Channel 2 maps to the third column of the output matrix.

Dependencies

To specify a nondefault mapping, clear theUse default mapping between sound card’s input channels and columns of output of this blockparameter.

Output number of samples overrun—Specify additional output port for number of samples overrun
off (default) | on

When you select this parameter, an additional output port,O, is added to the block. TheOport outputs the number of samples overrun while acquiring a frame of data (one output matrix).

Output data type—Data type output from block
`double`(default) |`single`|`int32`|`int16`|`uint8`

Data type of the output.

Note

If this parameter is specified asdoubleorsingle, the block outputs data in the range [–1, 1]. For other data types, the range is [min, max] of the specified data type.

Block Characteristics

Data Types	`double`\|`integer^a`\|`single`
Direct Feedthrough	`no`
Multidimensional Signals	`no`
Variable-Size Signals	`no`
Zero-Crossing Detection	`no`
^aSupports 16- and 32-bit signed and 8-bit unsigned integers.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

The executable generated from this block relies on prebuilt dynamic library files (.dll files) included with MATLAB. Use thepackNGofunction to package the code generated from this object and all the relevant files in a compressed zip file. Using this zip file, you can relocate, unpack, and rebuild your project in another development environment where MATLAB is not installed. For more details, seeRun Audio I/O Features Outside MATLAB and Simulink.

Version History

Introduced in R2016a

Audio Device Reader

描述

Examples

Read from Microphone and Write to Speaker

Ports

Output

A—Output signal
scalar | vector | matrix

O—Number of samples overrun
scalar

Dependencies

Parameters

Driver—Driver used to access your audio device
`DirectSound`(default) |`ASIO`|`WASAPI`

Device—Device used to acquire audio samples
default audio device (default)

Info—View information about your audio input configuration
button

Sample rate (Hz)—Sample rate your device uses to acquire audio data
`44100`(default) | integer

Number of channels—Number of channels acquired by your audio device
`1`(default) | integer

Dependencies

Samples per frame—Frame size read from audio device
`1024`(default) | integer

Device bit depth—Data type used by device to acquire audio data
`16-bit integer`(default) |`8-bit integer`|`16-bit integer`|`24-bit integer`|`32-bit integer`

Use default channel mapping—Toggle channel mapping source
on (default) | off

Device input channels—Specify nondefault channel mapping
`[1:MaximumInputChannels]`(default) | scalar | vector

Dependencies

Output number of samples overrun—Specify additional output port for number of samples overrun
off (default) | on

Output data type—Data type output from block
`double`(default) |`single`|`int32`|`int16`|`uint8`

Block Characteristics

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

See Also

Topics

Audio Device Reader

描述

Examples

Read from Microphone and Write to Speaker

Ports

Output

A—Output signalscalar | vector | matrix

O—Number of samples overrunscalar

Dependencies

Parameters

Driver—Driver used to access your audio deviceDirectSound(default) |ASIO|WASAPI

Device—Device used to acquire audio samplesdefault audio device (default)

Info—View information about your audio input configurationbutton

Sample rate (Hz)—Sample rate your device uses to acquire audio data44100(default) | integer

Number of channels—Number of channels acquired by your audio device1(default) | integer

Dependencies

Samples per frame—Frame size read from audio device1024(default) | integer

Device bit depth—Data type used by device to acquire audio data16-bit integer(default) |8-bit integer|16-bit integer|24-bit integer|32-bit integer

Use default channel mapping—Toggle channel mapping sourceon (default) | off

Device input channels—Specify nondefault channel mapping[1:MaximumInputChannels](default) | scalar | vector

Dependencies

Output number of samples overrun—Specify additional output port for number of samples overrunoff (default) | on

Output data type—Data type output from blockdouble(default) |single|int32|int16|uint8

Block Characteristics

Extended Capabilities

C/C++ Code GenerationGenerate C and C++ code using Simulink® Coder™.

Version History

See Also

Topics

A—Output signal
scalar | vector | matrix

O—Number of samples overrun
scalar

Driver—Driver used to access your audio device
`DirectSound`(default) |`ASIO`|`WASAPI`

Device—Device used to acquire audio samples
default audio device (default)

Info—View information about your audio input configuration
button

Sample rate (Hz)—Sample rate your device uses to acquire audio data
`44100`(default) | integer

Number of channels—Number of channels acquired by your audio device
`1`(default) | integer

Samples per frame—Frame size read from audio device
`1024`(default) | integer

Device bit depth—Data type used by device to acquire audio data
`16-bit integer`(default) |`8-bit integer`|`16-bit integer`|`24-bit integer`|`32-bit integer`

Use default channel mapping—Toggle channel mapping source
on (default) | off

Device input channels—Specify nondefault channel mapping
`[1:MaximumInputChannels]`(default) | scalar | vector

Output number of samples overrun—Specify additional output port for number of samples overrun
off (default) | on

Output data type—Data type output from block
`double`(default) |`single`|`int32`|`int16`|`uint8`

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.