Speech and Audio Processing
Every telephone, smart or not, relies heavily on speech processing techniques to make voice communication between two (or more) people possible. From analog-to-digital conversion to speech enhancement (filtering, echo-, noise-, and automatic gain control) to speech encoding on recording side to speech decoding to speech enhancement (typically filtering and gain control) to digital-to-analog conversion on the playback side.
Signal processing is the tool of choice every step of the way. Without signal processing, modern digital assistants, such as Siri, Google Now, and Cortana, would not be able to recognize a user’s voice.
Audio compression techniques, such as MP3 and AAC, have revolutionized the way we listen to music. We can now hold the world’s music musical catalog in the palm of our hands and enjoy listening to music on-the-go, even completely untethered via Bluetooth. Again, signal processing made this happen.
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