Hi, I am new to the speex codec, I wonder if there are detailed documentation about the aec and agc algorithms defined in preprocess.c? Or the algorithms already all described in detail in the paper mentioned in the source code? Thanks -- Xuedong Zhang, Ph.D. Senior DSP Engineer zhang at mayflowercom.com Tel: 1-781-359-9500 ext.290 Mayflower Communications 20 Burlington Mall Road Burlington, MA 01803 -- STATEMENT OF CONFIDENTIALITY The information in this e-mail and its attachments, if any, may be privileged and confidential information of Mayflower Communications Company, Inc., and is intended for the exclusive use of the intended recipient(s). If you are not the intended recipient, you are informed that any form of use, copying, or dissemination of this information is strictly prohibited. Please inform sender of error by return e-mail or by calling 781-359-9500, and destroy all copies of this e-mail and its attachments in your possession.