|
|
Part: DSP56300DNECP
Category:
Description:
Company: Motorola Semiconductor Products
Datasheet: Download DSP56300DNECP datasheet File size : 331 kB
Request For quote: Find where to buy DSP56300DNECP
Datasheet text preview:
MOTOROLA
Semiconductor Software Product Brief
Digital Network Echo Canceller
DSP56300DNECP/D (Motorola Order Number) Rev. 0, 09/99
Processor and Specification
· · Motorola DSP56300. ITU-T G.165 and G.168 compliant multi-channel digital network echo cancellation DSP software.
Features and Performance
The software uses a transversal (FIR) adaptive filter to model the echo path and generate an echo replica that is subtracted from the send signal, virtually eliminating network echoes. For the IIR solution, an additional filter is employed to form an equivalent IIR filter structure. This structure enables the echo canceller to cancel longer echo path delays than an FIR filter of equivalent complexity. The echo canceller can be scaled to provide a multi-channel solution, and it can provide 32 channels of echo canceller capable of integration with 32-channels of DTMF detection within a single DSP without the need for external memory. The software is available to cover many different echo path delays (tail-spans) from 4 ms to 64 ms. Each channel can be controlled independently via separate control words. The following functions are provided: · · · · Echo canceller enable/disable NLP enable/disable Comfort noise enable/disable 2100 Hz disabling tone (V.8 / V.25) detector enable/disable
The following diagnostic modes (for G.165 / G.168 testing) may also be selected: · · Freeze coefficient (H-register) adaptation Clear H-register
An output flag for 2100 Hz tone detection is also provided.
Interface Details
The software consists of two subroutines, one for initialization and one for processing. The initialization routine, normally called only on DSP reset, resets the echo canceller for the particular channel. To comply with G.165 and G.168, the processing subroutine operates on a per-sample basis. Three buffers are for data I/O: one for reference signal input (Rin), one for echo path input (Sin), and one for echo path output (Sout). The interface code should ensure that these buffers are updated before calling the main subroutine. Pointers (address registers) to memory blocks reserved for each channel and to the data buffers are passed to the software.
Applications and Availability
Network echo control on international or mobile telephony circuits. Now, under license, for a one-off payment and/or royalties depending on the commercial application. Application notes are available. Support consultancy for code integration is also available.
This document contains information on products under development. © Motorola, Inc., 1999
Digital Network Echo Canceller
DSP Requirements
DSP Requirements
The following tables list the DSP requirements of the network echo canceller core software. Some overhead should be allowed for data I/O. All MIPS figures quoted are worst case; n = number of channels.
Equivalent Echo Path Program Memory Delay (ms) (Words) 4 8 16 32 64 453 453 453 453 453 Data Memory X (words) 36n 68n 132n 260n 516n Y (words) 41n 73n 137n 265n 521n 1.74n 2.51n 4.05n 7.12n 13.26n Processing Load (MIPS)
Processor requirements for the core processing, FIR solution Equivalent Echo Path Delay (ms) 4 8 Program Memory (Words) 460 460 Data Memory X (words) 20n 28n Y (words) 18n 7326 1.66n 1.86n Processing Load (MIPS)
Processor requirements for the core processing, IIR solution Data Memory Function Program Memory (Words) X (words) NLP + comfort noise 2100 Hz tone detection +6n +41n Y (words) 0.8n 1.5n Processing Load (MIPS)
1-2
Digital Network Echo Canceller
Motorola
DSP Requirements
DSP56300 Application Software Modules
Application/Module CDMA Speech Codecs IS-127 (EVRC) IS-96A (8Kbps QCELP) IS-733 (13Kbps QCELP) GSM Speech Codecs Half Rate (HR) VSELP, 5.6Kbps Full Rate (FR) RPE-LTP, 13Kpbs Enhanced Full Rate (EFR) ACELP, 12.2Kbps Adaptive Multi-Rate (AMR) ITU Standard Speech Codecs G.711, 48, 56, and 64Kbps G.722, 48, 56, and 64Kbps G.723.1, 5.3 and 6.4Kbps G.726, 16, 24, 32, and 40Kbps G.728, 16Kbps G.729 G.729 with annex A and B Other Speech Processing Acoustic Echo Cancellation General Telecommunication Multi-channel Dual Tone Multi-Frequency (DTMF) Transmit and Receive Modem and Wireline Group 3 FAX Modem Pumps (V.17, V.21, V.27ter, V.29) V.32/V.32bis Data Modem Pump G.165/G.168 Hybrid Echo Cancellation (HEC) Passive Integrated Services Data Network (ISDN) MSW1B002AAF MSW1B003AAF MSW1A001AAF MSW1C201AAF MSW1A002AAF MSW1A003AAF MSW1D001AAF MSW1D002AAF MSW1D004AAF MSW1D007AAF MSW1D003AAF MSW1D006AAF MSW1D005AAF MSW1D201AAF MSW1D201AAF MSW1D202AAF Consult Factory MSW1D103AAF MSW1D101AAF MSW1D102AAF Part Number
Motorola
1-3
For further information, visit our Web site at http://www.sasl.com, send us email at sasl.com, or contact your nearest Signals & Software Office at: Signals + Software, Ltd. The Heights Lowlands Road, Harrow, Middlesex, HA1 3AW, Tel: FAX: +44 (0) 208 872 9000 +44 (0) 208 872 9001 Signals and Software , Inc. 2180 Sugarloaf Corporate Center, Suite 360 2180 Satellite Blvd Duluth, Georgia, 30097, Tel: +1 (678) 584 8680 FAX: +1 (678) 584 8681
Motorola and Signals + Software (SASL) reserve the right to make changes without further notice to any products herein. Motorola and SASL make no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola or SASL assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA/Europe/Locations Not Listed: Motorola Literature Distribution P.O. Box 5405 Denver, Colorado 80217 1 (800) 441-2447 1 (303) 675-2140 Motorola Fax Back System (MfaxTM): TOUCHTONE (602) 244-6609 1 (800) 774-1848 RMFAX0@email.sps.mot.com Asia/Pacific: Motorola Semiconductors H.K. Ltd. 8B Tai Ping Industrial Park 51 Ting Kok Road Tai Po, N.T., Hong Kong 852-26629298 Technical Resource Center: 1 (800) 521-6274 DSP Helpline dsphelp@dsp.sps.mot.com Japan: Nippon Motorola Ltd SPD, Strategic Planning Office141 4-32-1, Nishi-Gotanda Shinagawa-ku, Japan 81-3-5487-8488 Internet: http://www.motorola-dsp.com/
Others parts begin by ds
|
|
|
