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README.md
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## Audio Line-Level to Microphone-Level Converter
Decoding SSTV signals is more reliable with a clean input. Using a direct cable connection instead of acoustic coupling avoids echo, distortion, and environmental noise.
Most smartphones use TRRS connectors for headsets. In these connectors, the sleeve and the second ring (next to the sleeve) serve dual roles: depending on the standard, one is the microphone input and the other is ground. The tip and second ring carry the left and right audio channels.
Most smartphones use TRRS connectors for headsets. In these connectors, the sleeve and the second ring (next to the sleeve) serve dual roles: depending on the standard, one is the microphone input and the other is ground. The tip and first ring carry the left and right audio channels.
When a TRS plug is inserted into a TRRS jack, the sleeve and second ring are shorted together. This allows regular stereo headphones (without a microphone) to work correctly.