![]() This can then be stored or transmitted without any degradation. With digital audio, the sound is sent to an analog to digital converter (ADC) to create a digital representation of it. Even the best analog electronics will induce electrical noise and distortion in the signal, although modern designs are impressively clean.ĭigital audio was touted as a way to eliminate those distortions of the sound. Getting the sound from the microphone to the speaker, especially if you wanted to record it and play it back on the speaker later, involved a lot of analog electronics. The vibrations of sound on a transducer like a microphone can be amplified and then sent to a speaker, whose cone reproduces those vibrations. Sound by its own nature is analog, and, prior to the development of digital sound, audio equipment was also analog. ![]() Here’s a quick refresher in case you aren’t familiar with the concept, if you are then feel free to skip it! Digital Audio In order to understand I2S, it’s a good idea to also understand how digital audio works. Standardized protocols for transferring data and sound would allow designs using ICs from different manufacturers, which is a good thing for everybody. As you might recall, Phillips also developed the I2C protocol, and both protocols were built to serve a similar need.īoth I2C and I2S addressed the need for compatibility between integrated circuits that handled data and sound information. The Inter-Integrated Circuit Sound Protocol, or I2S, was developed by Phillips Semiconductors in 1986. Today we will be exploring the use of I2S with the ESP32, and we’ll build a few projects that use the I2S protocol. The audio quality can range from telephone-grade to ultra-high fidelity, and you can have one or two channels. I2S is a protocol for transferring digital audio. At a glance, you may just think that it’s another form of I2C, and the “I2” does indeed stand for the same thing, “Inter-Integrated Circuit”. If you are browsing through the specification sheet for an ESP32 device, you might run across the term “I2S”. ![]()
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