The FM1182 voice processor is Fortemedia’s latest generation of low-power, high-performance chips following the release of the successful FM1072LP voice processor. FM1182 raises the bar on performance – 60dB of AEC (acoustic echo cancellation) and enhanced noise suppression – while keeping virtually the same low power consumption. With built-in support for SAM (Small Array Microphone) technology, a beam-forming effect can be achieved with 2 microphones right next to each other.

The FM1182 provides an optimized solution for the voice interface market, in applications including:

• Automotive hands-free functions (ex: Built-in HFCK, Aftermarket HFCK)
• Handheld mobile devices (ex: Smartphones, PDAs)
• PC/VoIP (ex: Speakerphones)
• Automotive temperature grade available

Low Power Consumption

The FM1182 draws between 30 and 35mW of power for typical usage. This low-power is possible for two reasons. First an integrated hardware accelerator helps to offload intensive processing from the main DSP, allowing the chip to function at an optimal MIPS. Second, the FM1182 chip is specifically designed for Fortemedia’s patent-pending SAM voice processing algorithm, ensuring the highest possible power efficiency. For power-conscious portable devices, the FM1182 provides a well-suited solution for echo-cancellation and noise suppression needs.

High-Performance

SAM technology in FM1182 enables beam-forming capability for clear and noise free communication. The beam-effect pinpoints the location of the talker (inside the beam), while removing all the ambient noise outside of the beam. This noise can be non-stationary, such as people talking, the radio playing, or even doors slamming.

FM1182 supports 60dB of AEC performance along with enhanced noise suppression, removing stationary and non-stationary noise. For noisy conditions, such as in a car cabin driving on the freeway, this performance is critical for the user to enjoy their hands-free conversation. FM1182 also includes the industry’s most effective non-linear echo cancellation, crucial in integrated designs where the microphone can pick up vibrations caused by the speaker.

Small-Size

The excellent echo cancellation of the FM1182 chip allows designers to integrate a speaker with microphones, requiring only a 4cm distance between the two. With SAM, the 2 microphones can be placed practically right next to each other, freeing designers to let their imaginations run wild without the space constraints of other solutions.

The FM1182 voice processor is available in a 5x5mm 48-pin BGA package. This small form-factor allows designers who are board-space constrained to now utilize Fortemedia’s voice processing powers. FM1182 is also available in a 48-pin LQFP package.

Performance and Features

• Highly integrated single chip solution
  • 16-bit DSP w/ Hardware Accelerator (Up to 40 MIPs)
  • 3 ADC (Analog to Digital Converter)
  • 2 DAC (Digital to Analog Converter)
  • RAM, ROM
  • On-chip microphone amplifier
  • USB 1.1 port for voice data
  • UART interface to external controller
  • Serial port interface supports u-Law, A-Law, and linear PCM format
• Extreme low power consumption (30-35mW)
• High performance
  • Powerful AEC (acoustic echo cancellation) (60dB)
  • Superior full-duplex
  • Supports 1 & 2 microphone modes
  • Microphone select mode to choose between Mic0 and Mic1 as the main microphone (when using SAM with beam-forming)
  • Differential I/O to reduce RF interference and increase noise immunity
  • Dynamic range control (DRC) to increase voice intelligibility
  • Side tone cancellation of 25 to 35dB
  • Acoustic echo tail length coverage: 64 to 100ms
  • Mic_in & Line_in PGA (programmable gain amplification) range from
    -2dB to +26dB
  • Line_out & Spk_out PGA range from -29dB to +2dB
• Supports 2 clock inputs: 4.096MHz or 13MHz
• Available in 48-pin BGA & 48-pin LQFP packages
• Available in Automotive and Extended temp grades