 of physics and cannot be resolved by material, component level or algorithmic innovation. Additionally, problems that can be resolved by innovation take longer to resolve than expected. In wireless we find that RF component innovation in particular moves slowly and introduces additional unex- pected costs throughout the supply chain, especially for the operator and service provider community. Also, sufficient incentives need to be in place to ensure adequate innovation OC- curs at the right time and sufficient engineering effort is applied to translate that innovation into practical fiscal gain. This sets the narrative for both the remainder of this chapter and Chapter 5. Figure 4.13 shows the main functional components in a modern multimedia handset. The 'front-end' filters and diplexers deliver a signal path to and from the baseband signal Making Telecoms Work Display Keypad Mobile Motion Sensor Television Power Detection Broadband Analog Integrated Microphone Filter and Digital Audio Diplexer Power Othello Signal Processing Switch (eg. SoftFone) Integrated Switch Speaker Memory Camera Module Application Coprocessor Display (optional) Other Key Components: Backlight Control Digital Potentiometer Power Management Signal Control Touch Supervisory Control References Figure 4.13 Functional block diagram of a modern multimedia handset. Reproduced with permission of MediaTek (previously Analog Devices). processor. On the receive path, a power-detection function measures the received signal strength that determines the amount of transmit power being used on the transmit path. The transmit path includes the power amplifier. The baseband signal processor filters the re- ceived signal and provides an interface to all other devices in the phone including the display, audio paths, voice paths and camera module. This example also includes a MEMS motion sensor. From the above, it might be assumed that the cost of the RF functions in the phone are reducing as an overall percentage of the total costs as additional non-RF func