Veldig bra med et spørsmål rundt det. Jeg kan lite om det tekniske, men ser jo for meg at det har mange fordeler ved å bruke DSP, mens det i andre tilfeller kan være bedre å ha det integrert i CPUen. Men dette kan de helt sikkert si noe mer om.
Fant forøvrig en fin artikkel om DSP, som kan være relevant for det Elabs driver med. Fra 2019, men dette forklarer teknikken mer generelt:
"I’ve talked before about how a sensor hub can be used to offload the work of sensor fusion from the main CPU of your device, and a DSP offers the same benefit, allowing you to run multiple functions without overtaxing your primary CPU. For applications requiring always-on functions, embedded DSPs offer a cost-effective, low-power solution that can meet performance requirements.
Always-on functions operate in the background, and can be a combination of multiple sensor types, such as IMUs, voice or presence detection for more comprehensive context. Examples of always-on functions include:
- Pedometers and GPS in smartphones or wearables
- Lane assist or passenger seat detection in cars
- Voice control on smart speakers
In sensing applications, sensors are gathering information on light, sound, 3D movement and relative location. Some multi-axis sensors, including IMUs, perform their own data processing via sensor fusion to blend several inputs. A DSP can take this sensor fusion data and process it with additional sensor data (light, sound, etc) to tell a comprehensive story.
Most smart audio, video and imaging applications require at least some of these types of always-on voice control and object detection functions. For those functions to be executed, multiple sensor inputs need to be processed in real time. With a dedicated digital signal processor, these computations can be run in parallel with the CPU, so that many different functions can be carried out at the same time.
Dedicated processing is a common theme of digital signal processors and sensor hubs, which provide specialized functionality to elevate and accelerate the development of technology for the fast paced demands of tomorrow."