https://blog.k3170makan.com/2018/09/introduction-to-elf-format-elf-header.html
One of the pins is programmed to produce a constant 1000 KHz square wave using PIO. The main program then turns the PIO on and off at the intended frequency. e.g. to emit an A4 pitch (440 Hz), it turns the 1000 KHz square wave on and off 440 times a second. To the radio receiver, this means a 440 Hz square wave audio. Using this technique, it emits the well-known Shave and A Haircut melody on a loop.
Listen to the best of BBC Radio Manchester on Sounds and follow BBC Manchester on Facebook, X, and Instagram. You can also send story ideas via Whatsapp to 0808 100 2230.，这一点在体育直播中也有详细论述
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光影秀就像一场户外的影片，除了有好创意，更关键的是将创意呈现出来。
Москвичей предупредили о резком похолодании09:45。业内人士推荐体育直播作为进阶阅读