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Add tone detection using Goertzel algorithm.

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Peter Hinch 2025-02-06 11:12:12 +00:00
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README.md
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@ -47,8 +47,8 @@ Please also see the [official examples](https://github.com/micropython/micropyth
4.15 [Date](./README.md#415-date) Small and simple classes for handling dates. 4.15 [Date](./README.md#415-date) Small and simple classes for handling dates.
4.16 [Greatest common divisor](./README.md#416-greatest-common-divisor) Neat algorithm. 4.16 [Greatest common divisor](./README.md#416-greatest-common-divisor) Neat algorithm.
4.17 [2D array indexing](./README.md#417-2d-array-indexing) Use `[1:3, 20]` syntax to address a 2D array. 4.17 [2D array indexing](./README.md#417-2d-array-indexing) Use `[1:3, 20]` syntax to address a 2D array.
4.18 [Astronomy](./README.md#418-astronomy) Derive Sun and Moon rise and set times, moon phase. 4.18 [Astronomy](./README.md#418-astronomy) Derive Sun and Moon rise and set times, moon phase.
4.19 [Tone detection](./README.md#419-tone-detection) Goertzel algorithm. 4.19 [Tone detection](./README.md#419-tone-detection) Goertzel algorithm.
5. [Module Index](./README.md#5-module-index) Supported code. Device drivers, GUI's, utilities. 5. [Module Index](./README.md#5-module-index) Supported code. Device drivers, GUI's, utilities.
5.1 [asyncio](./README.md#51-asyncio) Tutorial and drivers for asynchronous coding. 5.1 [asyncio](./README.md#51-asyncio) Tutorial and drivers for asynchronous coding.
5.2 [Memory Device Drivers](./README.md#52-memory-device-drivers) Drivers for nonvolatile memory devices. 5.2 [Memory Device Drivers](./README.md#52-memory-device-drivers) Drivers for nonvolatile memory devices.
@ -399,7 +399,7 @@ work at global locations and timezones. See [docs](./astronomy/README.md).
This module may be used for detection of audio tones. It uses the Goertzel This module may be used for detection of audio tones. It uses the Goertzel
algorithm which is effectively a single-bin Fourier transform. See algorithm which is effectively a single-bin Fourier transform. See
[docs](./goertzel/README.md) [docs](./goertzel/README.md).
# 5. Module index # 5. Module index

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goertzel/README.md
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@ -1,5 +1,5 @@
# Tone detection # Tone detection
The `goertzel3.py` implementation was written for the Pyboard but could be The [goertzel3.py](https://github.com/peterhinch/micropython-samples/blob/master/goertzel/goertzel3.py)
adapted for other platforms. It includes test tone generation. See code implementation was written for the Pyboard but could be adapted for other
comments for more details. platforms. It includes test tone generation. See code comments for more details.