The AMBIN FM1073B voice processor provides a highly integrated cost-effective solution for hands-free mobile communication. Bundled with Array Microphone Beam-forming Integrated with Noise-suppression (AMBIN) technology for advanced noise suppression and echo cancellation, the device also enables a significant enhancement to full duplex performance and voice quality for automotive applications and hands-free car kits.
Based on the same technology as the successful FM1061, the FM1073B adds array microphone support with differential inputs and outputs to minimize the RF interference and white noise. The support of up to 2 microphones allows customers to select the optimal configuration for their applications. A designer can use a single microphone for the lowest cost solution, or two microphones to enable better acoustic echo and full duplex performance, suppress severe noise, and increase the voice recognition rate. The FM1073B solution enables loud and clear communication, even in a highly noisy car environment.

FM1073B Performance and Features

Single-chip Solution

• Voice processor with echo cancellation
• 3 channels of A/Ds and 2 channels of D/As with programmable gain control
        - 120-3400Hz bandwidth for 8KHz sample rate
        - 8KHz sampling rate, 78dB SNR
• 36 Kbytes ROM & 16 Kbytes RAM

High Performance

• Acoustic echo cancellation (AEC) up to 45dB
• Excellent noise suppression of 13-18dB at severely noisy environments (low SNR)
• Beam-forming small mic array with up to 2 microphones
• Differential inputs & outputs to reduce RF interference and increase noise immunity
• Improved CODEC performance to further improve the quality of mobile communications

Digital Interface

• I2C or UART interface to offer control interface by optional micro-controller
• I2S or CHI Bus for digital voice data interface
• Configurable digital command interface to cellular phone
• Supports u-Law and linear PCM formats
• Increased flexibility with customization through an EEPROM interface

Other Features

• Side tone cancellation
• On chip microphone amplifier with programmable gain
• Small form-factor (48-pin LQFP and QFN)