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CREPE Preprocess

Preprocess audio for CREPE deep pitch estimation

Since R2023a

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Libraries:
Audio Toolbox / Deep Learning

Description

The CREPE Preprocess block generates frames from the input audio signal that you can feed to a CREPE pretrained network or to a network that accepts the same inputs as CREPE.

Examples

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This example uses:

Open Model

This example shows how to use the CREPE blocks to combine preprocessing, network inference, and postprocessing and obtain pitch estimations from an audio signal. See Estimate Pitch Using Deep Pitch Estimator Block for an example that uses the Deep Pitch Estimator block to perform the same task.

Adjust the parameters of the blocks to speed up computation and see the pitch estimations in real time as the audio plays.

  • Set the Overlap percentage (%) of the CREPE Preprocess block to 50. With a lower overlap percentage, the system processes frames less frequently.

  • Set the Number of output frames of the CREPE Preprocess block to 5. This causes the CREPE Preprocess block to buffer audio frames and pass them to the CREPE block in batches. Passing batches to the CREPE block improves computational efficiency by allowing it to process multiple frames in parallel. However, it also increases latency because the system outputs pitch estimations in batches instead of one at a time.

  • Set the Model capacity of the CREPE block to Large. This model has fewer parameters than the full-size model, leading to faster computation at the cost of slightly lower accuracy.

Run the model to listen to a singing voice and view the estimated pitch in real time.

Ports

Input

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Audio input, specified as a one-channel signal (vector). If Sample rate of input signal (Hz) is 16e3, there are no restrictions on the input frame length. If Sample rate of input signal (Hz) is different from 16e3, then the input frame length must be a multiple of the decimation factor of the resampling operation that the block performs. If the input frame length does not satisfy this condition, the block generates an error message with information on the decimation factor.

Data Types: single | double

Output

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Preprocessed audio frames for the CREPE neural network, returned as a 1024-by-1-by-1-by-N array, where N is the number of generated frames specified by Number of output frames.

Data Types: single

Parameters

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Sample rate of the input signal in Hz, specified as a positive scalar.

Specify the overlap percentage between consecutive frames as a scalar in the range [0, 100).

Number of generated frames in the output, specified as a positive integer.

Block Characteristics

Data Types

double | single

Direct Feedthrough

no

Multidimensional Signals

no

Variable-Size Signals

no

Zero-Crossing Detection

no

References

[1] Kim, Jong Wook, Justin Salamon, Peter Li, and Juan Pablo Bello. “Crepe: A Convolutional Representation for Pitch Estimation.” In 2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 161–65. Calgary, AB: IEEE, 2018. https://doi.org/10.1109/ICASSP.2018.8461329.

Extended Capabilities

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

Version History

Introduced in R2023a

See Also

Blocks

Functions