--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intercom/CHANGES	Fri Jun 25 09:57:52 2010 +0200
@@ -0,0 +1,99 @@
+CHANGES version 25sep2005
+
+version 0.4.1:
+  fixed aec_test.cpp
+  Tuning of parameter Thold and xfast threshold (from -55dB to -70dB)
+  Speaker output only right Line-out channel
+
+version 0.4:
+  new Soft decision Adrian DTD
+  speex_bits_write() gives different return value with Speex 1.0 and
+  Speex 1.1 lib. Emit error message "Update Speex lib to 1.1"
+  mix 2040Hz for VHF transmitter activation (not Intercom relevant)
+  Common Answer button
+  Diversion button
+  visualize w vector (TCP connection intercomd to wdisplay.tcl)
+  Leaky NLMS algorithm
+
+
+version 0.3.6:
+  Soft decision Adrian DTD instead of Geigel DTD
+  Soft decision Acoustic Echo Suppression
+  program option -b for no Acoustic Echo Suppression
+  Wideband Speex now 27.8kBit/s net (was 20.6kBit/s)
+
+
+version 0.3.5:
+  Reduce number of compile warnings (change signed to unsigned, ...).
+  Disable capture switch does no longer freeze intercomd.
+  add Wideband Speex Codec (20.6kBit/s)
+  option -k works in wideband mode.
+  create 2 binaries for narrowband, wideband operation
+  
+
+version 0.3.4:
+  H-infinity LMS-pw instead of NLMS-pw algorithm. 
+  See Haykin, Adaptive Filter Theory, 4. Edition, Chap. 5.10.
+  Cutoff Frequency now 2kHz for pre-whitening filters.
+  Correct FIR and IIR highpass filters for narrowband/wideband.
+  NoiseFloor is now -55dB for all codecs.
+  In wideband mode, option -k is broken. Compressing codecs work
+  bad in wideband mode. See file Makefile for wideband enabling.
+  Work in progress MMX and SSE implementation of dot product dotp().
+
+
+version 0.3.3:
+  experimental Wide Band support. 
+  Open PCM out changed back to 0.3.1 behaviour. 
+
+
+version 0.3.2:
+  experimental Wide Band support. All codecs use 16kHz sample rate,
+  options -f and -k are broken. Payload types are wrong.
+  Open PCM out only on demand fixed in audio_write().
+
+
+version 0.3.1:
+  open UDP ports at program start in intercom.tcl (slow CPUs bug fix)
+
+
+version 0.3:
+  Packet Loss Concealment for G.729, GSM-EFR
+  Packet Loss default behaviour is silence, optional PLC
+  check receive RTP packets payload type
+  SSRC does no longer change for the station (unique identifier)
+  fill RTP CSRC field at telephone conference
+  Avoid audio loops (multiple UDP RTP connections) by checking CSRC
+  Up/Down counter for active station notification in HMI
+  alternative fixed point acoustic echo cancellation - see aecfix.cpp
+  application ping from intercom.tcl to intercomd via TCP connection
+
+
+version 0.2.2:
+  Codec specific ambient noise default because of AEC divergence
+  Allow change of stability parameter delta for NLMS-pw any time
+  Kill intercomd at intercom destroy (Close Button)
+  Better handling of Operation System jitter
+  Packet Loss Concealment for iLBC
+
+
+version 0.2.1:
+  create 2 binaries with GSM-EFR and G.729 because of name conflicts
+  add G.726 32kbps codec (ITU-T G.191)
+
+
+version 0.2:
+  use Tcl/Tk tcludp lib for active station and failed station signalling
+  use UDP port 5004 for RTP, UDP port 55004 for signalling
+  add G.711 A-law, G.711 u-law, GSM codec (ITU-T G.191)
+  add G.729 (ITU-T G.729), GSM-EFR (3GPP 46.053) codec
+  write-only and read-only audio fd. Open PCM out only on demand
+
+
+version 0.1:
+  first release. Features:
+  iLBC codec (RFC3951, RFC3952)
+  subset of RTP stack (RFC3550, RFC3551)
+  Acoustic echo cancellation
+  telephone conference
+  intercom.tcl to intercomd process communication via TCP connection