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Jimmy Lapierre

MathWorks

Last seen: 18 days ago Active since 2018

I am a Software Developer for the Audio Toolbox at MathWorks. I also have a background in audio and speech compression standards, so I developed a deep expertise in real-time audio algorithms, psychoacoustics, signal processing and information theory.

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Answered
Parameters for room impulse response measurements using swept sine
Hi Jon, Since you do not have access to MATLAB on site, you will want to use sweeptone to create the exponential swept sine tha...

3 months ago | 0

| accepted

Answered
Sending a midi message from MATLAB to an external source audio plug in
If you want to use MIDI (as opposed to loading a plugin), have a look at midimsg. Just note that we don't support loading VSTi p...

6 months ago | 0

Answered
How to use synthesizer VST plugin after loading it using loadAudioPlugin function?
Unfortunately we do not support VSTi (MIDI instruments) at this time.

6 months ago | 0

| accepted

Answered
How do I interrupt a sound file that is currently being played?
You should write your audio samples by smaller frames (such as 1024 samples per frame). That way, you can stop writing at any ti...

6 months ago | 0

Answered
How do I play more than one sound file concurrently with audioDeviceWriter?
If you use audioDeviceWriter (or audioPlayerRecorder), you need to manage each frame yourself, including adding any signals that...

6 months ago | 0

Answered
Audio toolbox: using acousticLoudness() in reverse for "normalizing" audio signal
If you want average perceived loudness, consider omitting the time-varying option even though the signal isn't stationary. Othe...

6 months ago | 2

| accepted

Answered
How do I implement this code to the example called Active Noise Control Using a Filtered-X LMS FIR Adaptive Filter?
Hi Sean, I'll suggest that you also have a look at the Real-Time Example (linked here). The beginning of that example gives deta...

9 months ago | 0

Answered
Audio plugin not compiling after update to Xcode 11.4
The list of supported compilers can be found on this webpage. Either click the "Mac" tab for supported Xcode versions, or for pr...

10 months ago | 0

Answered
Audio toolbox for active speaker crossover
Q. Could an audio model pick up audio from another application, e.g. amazon music, apply the filters and stream out to the sound...

11 months ago | 0

| accepted

Answered
How to use audioDeviceWriter ?
I suspect that compexp returns a row vector instead of a column vector, so it looks like 1024 channels. Try pre-allocating y bef...

11 months ago | 0

Answered
SampleRateConvertion error in plugin
Hi Pablo, There are some limitations with codegen and the resampling objects. If you have a hard-coded ratio of 4, the easiest ...

11 months ago | 0

| accepted

Answered
audioPlayerRecorder PlayerChannelMapping not working as expected
The behavior of channel mapping with single channels depends on the driver (for example, it is different for ASIO and DirectSoun...

1 year ago | 0

Answered
Help, generateAudioPlugin Error
Xcode 11.4 introduced an incompatibility, so you would need to make sure you have the latest update (19b update 5, required for ...

1 year ago | 0

Answered
VST Plugin with Visual Studio 2019
Support for plugin generation Visual Studio 2019 was added in 2019b Update 5. Please let me know if you have the latest updates ...

1 year ago | 1

Answered
interpolateHRTF always trows warnings or errors when using either methods
Can I ask what version of Matlab you are using? If you can provide some sample code, it might also help. Does the help example ...

1 year ago | 0

Answered
ANC Simulink Model Error
Hi Olivia, it sounds like your device is incapable of ultra-low latency operation. Unless the noise to cancel is steady-state an...

1 year ago | 0

Answered
cannot generate VST audio plugin
Could you try building one of the examples that are shipped with Audio Toolbox, such as "StereoWidth" ? That might help us figur...

1 year ago | 0

Answered
How to determine the channel mapping (channel-to-track allocation) of a surround sound audio signal?
The proper order according to SMPTE is: Front Left, Front Right, Center, LFE, Surround Left, Surround Right. This is also the ...

2 years ago | 0

Answered
2 Sounds Cards and 5.1 speakers
The audioDeviceReader and audioDeviceWriter objects have "Driver" and "Device" properties. For example, if the output device sup...

2 years ago | 1