Sound Classification with Edge AI
Classifying environmental sounds into categories such as glass breaking, dog barking, machinery noise, sirens, or alarms. Uses mel-spectrogram feature extraction fed into lightweight CNN or dense networks. Distinct from voice recognition — no language model or speech-to-text involved, focuses on non-speech audio events and acoustic patterns.
Hardware Requirements
| Minimum RAM | 64 KB |
| Minimum Flash | 256 KB |
| Sensor Inputs | microphone |
| Typical Model Size | 40 KB (quantized int8) |
| Minimum Clock | 48 MHz |
Compatible Microcontrollers
ESP32
Espressif
520 KB RAM · 240 MHz
$5–$15 (dev board)
ESP32-C3
Espressif
400 KB RAM · 160 MHz
$4–$10 (dev board)
ESP32-C6
Espressif
512 KB RAM · 160 MHz
$5–$15 (dev board)
ESP32-S3
Espressif
512 KB RAM · 240 MHz
$10–$25 (dev board)
i.MX RT1062
NXP
1024 KB RAM · 600 MHz
$25–$40 (dev board)
nRF52833
Nordic Semiconductor
128 KB RAM · 64 MHz
$10–$25 (dev board)
nRF52840
Nordic Semiconductor
256 KB RAM · 64 MHz
$20–$35 (dev board)
RA6M5
Renesas
512 KB RAM · 200 MHz
$25–$50 (dev board)
STM32F4
STMicroelectronics
192 KB RAM · 168 MHz
$10–$30 (dev board)
STM32F7
STMicroelectronics
512 KB RAM · 216 MHz
$25–$60 (dev board)
STM32H7
STMicroelectronics
1024 KB RAM · 480 MHz
$30–$80 (dev board)
STM32L4
STMicroelectronics
128 KB RAM · 80 MHz
$15–$50 (dev board)
STM32U5
STMicroelectronics
786 KB RAM · 160 MHz
$20–$50 (dev board)
Hardware Guides
ESP32-C3 Sound Classification with Edge Impulse
Espressif's ESP32-C3 excels at sound classification via Edge Impulse. The 1-core risc-v at 160 MHz with 400 KB SRAM handles 40 KB quantized …
ESP32-C3 Sound Classification with TFLite Micro
Espressif's ESP32-C3 excels at sound classification via TFLite Micro. The 1-core risc-v at 160 MHz with 400 KB SRAM handles 40 KB quantized …
ESP32-C6 Sound Classification with Edge Impulse
The ESP32-C6 is an excellent match for sound classification with Edge Impulse. 512 KB SRAM delivers 8.0x the 64 KB minimum while 160 MHz pro…
ESP32-C6 Sound Classification with TFLite Micro
Espressif's ESP32-C6 excels at sound classification via TFLite Micro. The 1-core risc-v at 160 MHz with 512 KB SRAM handles 40 KB quantized …
ESP32-S3 Sound Classification with Edge Impulse
The ESP32-S3 is an excellent match for sound classification with Edge Impulse. 512 KB SRAM delivers 8.0x the 64 KB minimum while 240 MHz pro…
ESP32-S3 Sound Classification with TFLite Micro
For sound classification, the ESP32-S3 with TFLite Micro scores Excellent. Its 512 KB internal SRAM (8.0x the required 64 KB) and 240 MHz cl…
ESP32 Sound Classification with Edge Impulse
The ESP32 is an excellent match for sound classification with Edge Impulse. 520 KB SRAM delivers 8.1x the 64 KB minimum while 240 MHz proces…
ESP32 Sound Classification with TFLite Micro
Espressif's ESP32 excels at sound classification via TFLite Micro. The 2-core xtensa-lx6 at 240 MHz with 520 KB SRAM handles 40 KB quantized…
i.MX RT1062 Sound Classification with CMSIS-NN
The i.MX RT1062 is an excellent match for sound classification with CMSIS-NN. 1024 KB SRAM delivers 16.0x the 64 KB minimum while 600 MHz pr…
i.MX RT1062 Sound Classification with TFLite Micro
For sound classification, the i.MX RT1062 with TFLite Micro scores Excellent. Its 1024 KB internal SRAM (16.0x the required 64 KB) and 600 M…
nRF52833 Sound Classification with Edge Impulse
The nRF52833 handles sound classification effectively with Edge Impulse. 128 KB SRAM at 64 MHz provides 2.0x headroom over the 64 KB require…
nRF52833 Sound Classification with TFLite Micro
Nordic Semiconductor's nRF52833 is a solid choice for sound classification using TFLite Micro. The cortex-m4f core at 64 MHz with 128 KB SRA…
nRF52840 Sound Classification with Edge Impulse
The nRF52840 is an excellent match for sound classification with Edge Impulse. 256 KB SRAM delivers 4.0x the 64 KB minimum while 64 MHz proc…
nRF52840 Sound Classification with TFLite Micro
The nRF52840 is an excellent match for sound classification with TFLite Micro. 256 KB SRAM delivers 4.0x the 64 KB minimum while 64 MHz proc…
RA6M5 Sound Classification with CMSIS-NN
The RA6M5 is an excellent match for sound classification with CMSIS-NN. 512 KB SRAM delivers 8.0x the 64 KB minimum while 200 MHz processes …
RA6M5 Sound Classification with TFLite Micro
For sound classification, the RA6M5 with TFLite Micro scores Excellent. Its 512 KB internal SRAM (8.0x the required 64 KB) and 200 MHz clock…
STM32F4 Sound Classification with Edge Impulse
The STM32F4 is an excellent match for sound classification with Edge Impulse. 192 KB SRAM delivers 3.0x the 64 KB minimum while 168 MHz proc…
STM32F4 Sound Classification with TFLite Micro
STMicroelectronics's STM32F4 excels at sound classification via TFLite Micro. The 1-core cortex-m4f at 168 MHz with 192 KB SRAM handles 40 K…
STM32F7 Sound Classification with CMSIS-NN
STMicroelectronics's STM32F7 excels at sound classification via CMSIS-NN. The 1-core cortex-m7 at 216 MHz with 512 KB SRAM handles 40 KB qua…
STM32F7 Sound Classification with TFLite Micro
The STM32F7 is an excellent match for sound classification with TFLite Micro. 512 KB SRAM delivers 8.0x the 64 KB minimum while 216 MHz proc…
STM32H7 Sound Classification with CMSIS-NN
For sound classification, the STM32H7 with CMSIS-NN scores Excellent. Its 1024 KB internal SRAM (16.0x the required 64 KB) and 480 MHz clock…
STM32H7 Sound Classification with TFLite Micro
For sound classification, the STM32H7 with TFLite Micro scores Excellent. Its 1024 KB internal SRAM (16.0x the required 64 KB) and 480 MHz c…
STM32L4 Sound Classification with Edge Impulse
STMicroelectronics's STM32L4 excels at sound classification via Edge Impulse. The 1-core cortex-m4f at 80 MHz with 128 KB SRAM handles 40 KB…
STM32L4 Sound Classification with TFLite Micro
The STM32L4 is an excellent match for sound classification with TFLite Micro. 128 KB SRAM delivers 2.0x the 64 KB minimum while 80 MHz proce…
STM32U5 Sound Classification with CMSIS-NN
STMicroelectronics's STM32U5 excels at sound classification via CMSIS-NN. The 1-core cortex-m33 at 160 MHz with 786 KB SRAM handles 40 KB qu…
STM32U5 Sound Classification with TFLite Micro
The STM32U5 is an excellent match for sound classification with TFLite Micro. 786 KB SRAM delivers 12.3x the 64 KB minimum while 160 MHz pro…
Hardware Comparisons for Sound Classification
ESP32-C3 vs i.MX RT1062 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 95)
ESP32-C3 vs nRF52840 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 90)
ESP32-C3 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 90)
ESP32-C3 vs STM32F4 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 80)
ESP32-C3 vs STM32H7 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 95)
ESP32-C3 vs STM32L4 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 80)
ESP32-S3 vs i.MX RT1062 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 95)
ESP32-S3 vs nRF52840 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 90)
ESP32-S3 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 90)
ESP32-S3 vs STM32F4 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 80)
ESP32-S3 vs STM32H7 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 95)
ESP32-S3 vs STM32L4 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 80)
ESP32 vs i.MX RT1062 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 95)
ESP32 vs nRF52840 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 90)
ESP32 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 90)
ESP32 vs STM32F4 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 80)
ESP32 vs STM32H7 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 95)
ESP32 vs STM32L4 for Sound Classification
Side-by-side specs and compatibility scores (85 vs 80)
i.MX RT1062 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (95 vs 90)
nRF52840 vs i.MX RT1062 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 95)
nRF52840 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (90 vs 90)
STM32F4 vs i.MX RT1062 for Sound Classification
Side-by-side specs and compatibility scores (80 vs 95)
STM32F4 vs nRF52840 for Sound Classification
Side-by-side specs and compatibility scores (80 vs 90)
STM32F4 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (80 vs 90)
STM32H7 vs i.MX RT1062 for Sound Classification
Side-by-side specs and compatibility scores (95 vs 95)
STM32H7 vs nRF52840 for Sound Classification
Side-by-side specs and compatibility scores (95 vs 90)
STM32H7 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (95 vs 90)
STM32L4 vs i.MX RT1062 for Sound Classification
Side-by-side specs and compatibility scores (80 vs 95)
STM32L4 vs nRF52840 for Sound Classification
Side-by-side specs and compatibility scores (80 vs 90)
STM32L4 vs RA6M5 for Sound Classification
Side-by-side specs and compatibility scores (80 vs 90)
Industry Applications
Orchestrate Sound Classification with ForestHub
Your devices run sound classification on-device. ForestHub on your Linux edge gateway ingests their results over MQTT/Modbus/OPC-UA, orchestrates the sense-reason-act loop as an auditable graph, and acts on the line — the LLM is one node among many.