Global Speech Generating Devices Market Size, Share & Analysis Report by Product Type (Synthesized Speech Devices, Text-to-Speech Devices, Picture Communicators), Device Type (Fixed Display, Dynamic Display), Distribution Channel (Medical Supply Stores, Online Stores), End User (Hospitals, Clinics, Academic & Research Institutes), Region & Key Players – Industry Segment Overview, Market Dynamics, Competitive Strategies, Trends & Forecast 2025–2034