pynq.lib.audio Module¶
The pynq.lib.audio module is a driver for reading and recording values from an on-board audio mirophone, loading preexisting audio files, or playing audio input to an output device.
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class
pynq.lib.audio.
Audio
(description, gpio_name=None)[source]¶ Bases:
pynq.overlay.DefaultHierarchy
Class to interact with audio controller.
Each audio sample is a 32-bit integer. The audio controller supports only mono mode, and uses pulse density modulation (PDM).
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mmio
¶ MMIO – The MMIO object associated with the audio controller.
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gpio
¶ GPIO – The GPIO object associated with the audio controller.
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buffer
¶ numpy.ndarray – The numpy array to store the audio.
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sample_rate
¶ int – Sample rate of the current buffer content.
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sample_len
¶ int – Sample length of the current buffer content.
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static
checkhierarchy
(description)[source]¶ Hierarchy can be bound if it contains the ‘d_axi_pdm_1’ IP and it contains exactly one GPIO pin.
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static
info
(file)[source]¶ Prints information about pdm files.
The information includes name, channels, samples, frames, etc.
Note
The file will be searched in the specified path, or in the working directory in case the path does not exist.
Parameters: file (string) – File name, with a default extension of pdm. Returns: Return type: None
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load
(file)[source]¶ Loads file into internal audio buffer.
The recorded file is of format *.pdm.
Note
The file will be searched in the specified path, or in the working directory in case the path does not exist.
Parameters: file (string) – File name, with a default extension of pdm. Returns: Return type: None
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record
(seconds)[source]¶ Record data from audio controller to audio buffer.
The sample rate per word is 192000Hz.
Parameters: seconds (float) – The number of seconds to be recorded. Returns: Return type: None
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save
(file)[source]¶ Save audio buffer content to a file.
The recorded file is of format *.pdm.
Note
The saved file will be put into the specified path, or in the working directory in case the path does not exist.
Parameters: file (string) – File name, with a default extension of pdm. Returns: Return type: None
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