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1 CHANGES version 25sep2005
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2
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3 version 0.4.1:
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4 fixed aec_test.cpp
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5 Tuning of parameter Thold and xfast threshold (from -55dB to -70dB)
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6 Speaker output only right Line-out channel
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7
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8 version 0.4:
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9 new Soft decision Adrian DTD
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10 speex_bits_write() gives different return value with Speex 1.0 and
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11 Speex 1.1 lib. Emit error message "Update Speex lib to 1.1"
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12 mix 2040Hz for VHF transmitter activation (not Intercom relevant)
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13 Common Answer button
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14 Diversion button
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15 visualize w vector (TCP connection intercomd to wdisplay.tcl)
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16 Leaky NLMS algorithm
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17
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18
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19 version 0.3.6:
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20 Soft decision Adrian DTD instead of Geigel DTD
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21 Soft decision Acoustic Echo Suppression
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22 program option -b for no Acoustic Echo Suppression
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23 Wideband Speex now 27.8kBit/s net (was 20.6kBit/s)
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24
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25
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26 version 0.3.5:
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27 Reduce number of compile warnings (change signed to unsigned, ...).
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28 Disable capture switch does no longer freeze intercomd.
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29 add Wideband Speex Codec (20.6kBit/s)
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30 option -k works in wideband mode.
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31 create 2 binaries for narrowband, wideband operation
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32
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33
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34 version 0.3.4:
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35 H-infinity LMS-pw instead of NLMS-pw algorithm.
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36 See Haykin, Adaptive Filter Theory, 4. Edition, Chap. 5.10.
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37 Cutoff Frequency now 2kHz for pre-whitening filters.
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38 Correct FIR and IIR highpass filters for narrowband/wideband.
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39 NoiseFloor is now -55dB for all codecs.
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40 In wideband mode, option -k is broken. Compressing codecs work
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41 bad in wideband mode. See file Makefile for wideband enabling.
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42 Work in progress MMX and SSE implementation of dot product dotp().
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43
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44
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45 version 0.3.3:
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46 experimental Wide Band support.
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47 Open PCM out changed back to 0.3.1 behaviour.
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48
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49
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50 version 0.3.2:
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51 experimental Wide Band support. All codecs use 16kHz sample rate,
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52 options -f and -k are broken. Payload types are wrong.
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53 Open PCM out only on demand fixed in audio_write().
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54
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55
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56 version 0.3.1:
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57 open UDP ports at program start in intercom.tcl (slow CPUs bug fix)
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58
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59
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60 version 0.3:
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61 Packet Loss Concealment for G.729, GSM-EFR
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62 Packet Loss default behaviour is silence, optional PLC
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63 check receive RTP packets payload type
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64 SSRC does no longer change for the station (unique identifier)
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65 fill RTP CSRC field at telephone conference
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66 Avoid audio loops (multiple UDP RTP connections) by checking CSRC
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67 Up/Down counter for active station notification in HMI
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68 alternative fixed point acoustic echo cancellation - see aecfix.cpp
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69 application ping from intercom.tcl to intercomd via TCP connection
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70
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71
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72 version 0.2.2:
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73 Codec specific ambient noise default because of AEC divergence
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74 Allow change of stability parameter delta for NLMS-pw any time
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75 Kill intercomd at intercom destroy (Close Button)
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76 Better handling of Operation System jitter
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77 Packet Loss Concealment for iLBC
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78
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79
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80 version 0.2.1:
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81 create 2 binaries with GSM-EFR and G.729 because of name conflicts
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82 add G.726 32kbps codec (ITU-T G.191)
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83
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84
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85 version 0.2:
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86 use Tcl/Tk tcludp lib for active station and failed station signalling
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87 use UDP port 5004 for RTP, UDP port 55004 for signalling
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88 add G.711 A-law, G.711 u-law, GSM codec (ITU-T G.191)
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89 add G.729 (ITU-T G.729), GSM-EFR (3GPP 46.053) codec
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90 write-only and read-only audio fd. Open PCM out only on demand
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91
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92
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93 version 0.1:
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94 first release. Features:
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95 iLBC codec (RFC3951, RFC3952)
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96 subset of RTP stack (RFC3550, RFC3551)
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97 Acoustic echo cancellation
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98 telephone conference
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99 intercom.tcl to intercomd process communication via TCP connection
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