Voice Module

Voice Module – Seamless Cellular Voice Integration

This compact voice module bridges traditional GSM networks with modern embedded systems, enabling high‑quality voice calls and audio playback via a simple UART interface. Designed for IoT gateways, industrial controls, and consumer electronics, it supports standard AT‑commands while providing native voice buffers, gain control, and dual‑mode (mono/stereo) output, making it ideal for hands‑free applications, telemedicine devices, and secure communication panels.

With a built‑in analog modem and adaptive echo cancelation, it delivers clear speech at reduced power consumption (<10 mA in standby, up to 120 mA during active calls). The module’s flexible firmware allows custom voice prompts, tone sequences, and seamless integration with proprietary control software through its UART, I²C, and GPIO interfaces.

• Key Spec 1: Operating frequency – GSM‑900/1800/1900 MHz with optional 2G EDGE throughput up to 80 kbit/s
• Key Spec 2: Audio support – Mono (44.1 kHz/16‑bit) and optional stereo (48 kHz/16‑bit) with up to 8 dB programmable gain
• Key Spec 3: Power profile – 6 V DC supply, <10 mA standby, <120 mA peak during active voice
• Common Use Case: Integrated voice alerts and calls for industrial SCADA panels, smartwatch emergency request systems, and DIY IoT telephony projects