Mixed-Signal Digital Signal Processors for Integrated Access Devices Color

Features

• High-performance, programmable DSP optimized for low-cost, four-port Voice over Digital Subscriber Line (VoDSL) and Voice over Internet Protocol (VoIP) customer premises equipment
• Performs all necessary voiceband processing functions such as speech coding, G.168 echo cancellation, and signaling for four voice channels
• Includes complete DSP firmware for VoDSL/VoIP applications
• On-chip sigma-delta A/D, D/A converters reduce component count, system cost
• On-chip serial port permits direct connection to PCM highways or to additional external A/D, D/A converters
• Flexible 8/16-bit host port permits interfacing to a variety of host processors including PowerPC^®, ARM^®, and MIPS^®
• Evaluation board and development tools available
• Low-cost plastic packaging
• Low-power 3.3 V design
  

Functional Description

VoicePump’s VP140 mixed-signal digital signal processor (DSP) is designed to address the voiceband processing needs of low- to medium-density voice gateways and Integrated Access Devices (IADs) for Voice over Broadband applications.

A wide variety of speech coding and telephony algorithms may be performed upon commands issued by a host processor. The VP140, with its included DSP firmware, can be used as a DSP ‘black box’ since no DSP programming is required of the user.

The VP140 is based upon DSP Group’s TeakLiteDSPCore^® processor. It includes an integrated set of peripherals that have been optimized for use in IADs for Voice over Broadband networks.

• All requisite program and data memory on-chip
• Host processor interface
• Time-division multiplexed (TDM) serial port interface
• Sigma-delta A/D, D/A converters
• General-purpose input/output pins
• Interface to optional low-cost Flash ROM

BLES VoDSL Firmware Included:

• G.726 ADPCM Speech/Audio Codec
• G.711 A-/m-law PCM Speech Codec
• Voice Activity Detection (VAD)
• Comfort Noise Generation (CNG)
• G.168 Line Echo Cancellation (8–64ms)
• Q.24 DTMF Detection
• Fax/modem Detection
• Tone Generation
• Bellcore/ETSI Caller ID Types I & II
• Caller ID Modulation
• Error Mitigation/Bad Frame Interpolation
• Conference Bridge
• Adaptive Jitter Buffer

Additional DSP Algorithm Firmware Available Includes:

• G.729A/B/E CS-ACELP Speech Codec
• G.728 LD-CELP Speech Codec
• G.723.1/A MP-MLQ/ACELP Speech Codec
• G.722.1 7kHz Wideband Audio Codec
• Q.323 MF(R1) Detection
• Q.422 MF(R2) Detection
• E.182 Call Progress Detection
• Automatic Level Control
  

All algorithms are fully compliant with applicable standards!

VoicePump Company Overview

VoicePump, Inc., was originally established in 1993 as Analogical Systems, a developer of real-time DSP software for speech coding and telecom applications. In 1998, Analogical Systems developed complete system-level software applications for embedded Voice over Packet Network products and thereafter adopted the “VoicePump” company name. In March of this year, DSP Group acquired a majority stake in VoicePump and invested capital as well as intellectual property resources. With this backing, VoicePump began development of integrated Application-Specific Standard Products (ASSPs) optimized for VoDSL , VoIP and other packet voice applications.

BLES VoDSL IAD Application

The VP140 ASSP contains embedded firmware that performs all voiceband processing required for DSL Forum TR-036 Annex A Broadband Loop Emulation Services (BLES) VoDSL applications and is available today. In this application, a host processor performs the ATM protocol stack and networking functions in the IAD. The VP140 will typically perform either 64kbps G.711 PCM or 32kbps G.726 ADPCM coding of each voice channel which is then packetized and sent in place of a corresponding portion of the bandwidth of the data network. By keeping delay to a minimum, performing jitter buffering and fully compliant ITU-T G.168 echo cancellation, true “toll”-quality voice is attainable.

Single-Chip Four-Port VoDSL/VoIP Solution: The VP140 contains all requisite peripherals (memory, A/Ds and D/As) and processing power to perform four channels of 32ms G.168 echo-canceled G.711/G.726/G.723.1/G.729A/B on each channel, in addition to tone detection/generation and VAD/CNG.

To download the datasheet please click here