1.4 Comparison with Existing Features

Table1-1 shows a brief comparison of the key differences between the ECR software (also known as HDEC, High-Density Echo Cancellation), the Barge-In package and the CSP software. For a complete list of hardware that supports CSP, see the Release Guide and Release Update.

Table 1-1. Feature Comparison 

Feature	Available in Barge-in package	Available in ECR	Available in CSP
Full-duplex channel (simultaneous play and record)	No	No	Yes
Hardware support	D/21H, D/41H and D/41ESC	Dialogic high-density boards only	JCT-series boards and DM3 boards
Data format for play and record/stream	PCM 8 kHz (no AGC)	PCM 8 kHz (no AGC)	Several data formats available. For details, see Section1.3, Supported Data Formats.
Echo cancellation tap length	6 milliseconds (48 taps) used only for signal detection	Up to 16 milliseconds (128 taps)	Up to 16 milliseconds (128 taps)
Integrated barge-in and echo-cancelled streaming	No	No	Yes
Pre-speech buffers	256 bytes (can store up to 125 milliseconds)	No	Can store up to 250 milliseconds of 8 kHz PCM data
Echo-cancelled record initiated by voice activity detector	Yes	No	Yes
API	Part of voice library	Part of voice library	Separate CSP library

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