The evolution of call audio architecture in cellular phones: from independent modems to integrated systems
By
K7PJP
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Summary
This article discusses the architectural evolution of audio handling in cellphones, specifically focusing on how call audio was traditionally managed. In older phones, the cellular modem had direct analog audio connections to the microphone and speaker, functioning as an independent "cellular phone" device. The smartphone's OS and main processor merely provided control messages for starting and ending calls, while the modem handled all voice call audio independently.
Key quotes
· 3 pulledmodern smartphones have made call audio less of a special case (mostly by just becoming more complicated in general)
the cellular modem functioned basically as a completely independent device, a fully-capable 'cellular phone'
The role of the rest of the smartphone, and its operating system, was just to provide control messages for starting and ending calls
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