Siemens Introduces Full-Duplex Speakerphone Smart Chip; Adjusts to changes in room and ambient noise.CUPERTINO, Calif.--(BUSINESS WIRE)--Nov. 12, 1997--Siemens Microelectronics, Inc., today introduced the Acoustic Echo Canceler (ACE), a powerful DSP-based chip that provides a full-duplex speakerphone in analog and digital phones. The ACE (PSB PSB Pet Shop Boys (band) PSB Public Service Broadcasting (radio and television) PSB Public Service Board (Vermont) PSB Public Security Bureau (China) 2170) does not require a learning tone and adapts quickly to changes in the acoustic environment, such as people moving around or a door opening. Suitable for telephone and video conferencing, the device can be used in mobile phones, analog feature phones, ISDN ISDN in full Integrated Services Digital Network Digital telecommunications network that operates over standard copper telephone wires or other media. phones and PBX (Private Branch eXchange) An inhouse telephone switching system that interconnects telephone extensions to each other as well as to the outside telephone network (PSTN). applications. The ACE joins a series of voice-processing ICs from Siemens, including the recently introduced SAM, a programmable digital answering machine combined with speakerphone. The SAM and ACE are pin compatible and software compatible making multiple designs very easy. The on-board DSP (1) (Digital Signal Processor) A special-purpose CPU used for digital signal processing applications (see definition #2 below). It provides ultra-fast instruction sequences, such as shift and add, and multiply and add, which are commonly used in math-intensive provides for DTMF (Dual-Tone MultiFrequency) The type of audio signals that are generated when you press the buttons on a touch-tone telephone. See also DMTF. DTMF - Dual Tone Multi Frequency tone generation and detection, flexible ringing detection, programmable side gain, transducer correction filters, call progress tone detector, caller ID decoder, general purpose parallel port up to 16 bits, and independent gain for all channels. The ACE features two algorithms: -- Full-band: -20 dB ERLE ERLE Echo Return Loss Enhancement ERLE Energy-Related Laboratory Equipment ERLE Engine Rotor Life Extension @ 60 ms, less than 1 ms delay, full band -- Sub-band: -30 dB ERLE @ greater than 175 ms, 43 ms delay. The full-band algorithm introduces negligible delay and is better suited for real-time applications such as conference room speakerphones. The sub-band algorithm offers additional echo suppression enhancement and is better suited for video applications where delay is introduced for lip synching. The ACE supports IOM-2 compatible channels and offers a dedicated interface to the dual codec (1) (enCOder/DECoder) A hardware circuit that performs analog-to-digital conversion (ADC) and digital-to-analog (DAC) conversion. When analog signals are entered into a computer, cellphone or other device via a microphone or video source such as VHS tape or analog TV, (PSB 4851). The device is manufactured in an advanced 3V CMOS (Complementary Metal Oxide Semiconductor) Pronounced "c-moss." The most widely used integrated circuit design. It is found in almost every electronic product from handheld devices to mainframes. process, and is shipped in a P-MQFP-80 package. The PSB 2170 is priced at $6.50 per 100K, and is available immediately. Additional information, data and application notes can be found on the web at www.smi.siemens.com. Siemens Microelectronics, Inc. (SMI), based in Cupertino, Calif., develops and manufactures semiconductors, optoelectronics and passive components for the communications, automotive and computer peripherals industries. SMI offers one of the broadest product portfolios in the microelectronics industry, and is a market leader in communications ICs, smart power products, embedded DRAM technology and custom optoelectronics. A subsidiary of Siemens Corporation, N.Y., SMI is affiliated with Siemens AG Semiconductor Group and Passive Components Group, Munich, Germany. Additional information is available at http://www.smi.siemens.com . CONTACT: Siemens Jeff Davis, 408/777-4909 jeff.davis@smi.siemens.com |
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