The LEAD AMR Encoder is a DirectShow filter for compressing audio data using AMR speech compression. The AMR speech coder consists of a multi-rate speech coder, a source-controlled rate scheme including a voice activity detector and a comfort noise generation system, and an error concealment mechanism to combat the effects of transmission errors and lost packets.
The multi-rate speech coder is a single integrated speech codec with eight source rates from 4.75 kbps to 12.2 kbps, and a low rate background noise encoding mode. The speech coder is capable of switching its bit-rate every 20 ms speech frame upon command.
The LEAD AMR Encoder property page provides a user interface for changing the filter's attributes. The property page is shown in the following figure:
Changes will be applied directly to the streaming media with the ability to set them permanently by clicking Apply or OK, or to abandon changes by clicking Cancel. Positioning the mouse pointer over a control displays general information for that control. The following table shows the controls and their descriptions:
Bit Rate Drop-down list box
The desired output bit rate (kbps). Possible values are:
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