The FM1073V23 integrates a breakthrough algorithm which significantly shortens the distance between microphone and speaker to 4cm and enhances full duplex performance. In addition, the device suppresses non-stationary noise and increases far field pick up capability up to 5 meters, making the FM1073V23 ideally-suited for applications such as handheld speakerphones, walkie-talkies, and portable telematics.

To meet the requirements of rigid embedded environments where non-linear echo is created by over driving a speaker or through mechanical vibrations, the FM1073V23 features a sophisticated signal processing consisting of a big echo cancellation filter, a post filter, and a frequency domain non-linear filter. The superior non-linear echo cancellation makes the FM1073V23 a perfect fit for extremely compact devices where the microphone and the speaker are housed in the same mechanical chassis.

The FM1073V23 integrates a high-speed voice signal processor with on-chip memory, pre-amplifiers, and multiple CODECs into a single 48-pin package. With differential inputs and outputs, the FM1073V23 minimizes RF interference and white noise. Its digital interface (UART, SHI, and CHI bus) allows access to and from a Bluetooth controller, host processor, or mobile phones. Even more custom features can be programmed through the EEPROM interface.

FM1073V23 Performance and Features

Single-chip Solution

• Voice processor with echo cancellation
          - Non-linear Filter cancels both linear and non-linear echo
• 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
• 40 KB ROM & 17 KB RAM

Performance

• Superior acoustic echo cancellation of up to 60dB
• Excellent noise suppression of 13-18dB at severely noisy environments (low SNR)
• Enables short distance between microphone and speaker of 4cm
• Beam-forming small mic array with up to 2 microphones to suppress non-stationary noise (15 dB)
• Far-field pickup up to 5 meters
• Enhanced full duplex
• Differential inputs & outputs to reduce RF interference and increase noise immunity
• Improved CODEC performance to further improve the quality of mobile communications

Digital Interface

• Supports UART, SHI, and CHI bus interface for Bluetooth applications
• Configurable digital command interface to cellular phone
• Supports every existing protocol to Bluetooth controller: A-Law(8-bit), µ-Law(8-bit), 13-bit zero padding, 13-bit sign extension, 16-bit linear PCM format on CHI bus
• Increased flexibility with customization through an EEPROM interface

Other Features

• Side tone cancellation up to 35dB
• On chip microphone amplifier with programmable gain
• Interface to optional EEPROM for customization
• Automatic gain control (AGC) for both microphone and line inputs
• Small form-factor (48-pin LQFP and QFN)
• G.165 compliant