The space constraints of handheld product structures are increasing, the speakers are getting smaller and smaller, and the required sound is getting louder and louder, suppressing a variety of noises and echoes (linear and nonlinear echoes during video hands-free calls). The realization of clear voice communication under the environment is a problem facing solution.
The FM2010 chip launched by ForteMedia is based on the patented Mini Array Microphone (SAM) technology. It uses spatial filtering technology, long / near directional pickup of sound signals, suppression of acoustic noise, and low power consumption to eliminate acoustic echo. Cost of a single chip. This article will introduce the design essentials of mini array microphone technology in handheld communication products, the main functions of the FM2010 chip, and its typical applications in GSM mobile phones. Figure 1 is a schematic diagram of anti-noise in handheld mode; Figure 2 is a schematic diagram of anti-noise in hands-free mode.
Figure 1 SAM handheld mode anti-noise schematic
Figure 2 Anti-noise diagram of SAM hands-free mode
Key points of mini array microphone technology design
SAM technology can use Uni-MIC (main microphone) and Omni-MIC (reference microphone) to form a mini array microphone, which can be placed back-to-back or side-to-side, as shown in Figure 3. Using the differences in the physical characteristics of the two microphones, after processing by the FM2010 chip, a cone-shaped pickup beam is formed to form a spatial filter to suppress unsteady noise. Microphone characteristics, structural design and FM2010 parameter adjustment determine the direction, angle and suppression of non-steady-state noise of the tapered pickup beam.
Figure 3 microphone placement
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