📄 rfc741.txt
字号:
11 24 32 45 53 85
4711 8359 15175
12 25 33 47 54 87
4838 8596 15618
13 26 34 48 55 90
4969 8840 16075
14 27 35 50 56 93
5104 9092 16545
15 27 36 51 57 95
5242 9351 17029
16 28 37 53 58 98
5385 9618 17529
17 29 38 54 59 101
5533 9894 18043
18 30 39 56 60 104
5684 10177 18572
19 31 40 57 61 107
5841 10469 19118
20 32 41 59 62 111
6002 10770 19681
63 114
infinity
Cohen [Page 22]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
Note: This table has only 58 different intervals defined, since 5
values are repeated in the R(j) table.
* This value is the "Transmission Interval" (measured in samples)
as defined in item #6 of the NEGOTIATION.
Cohen [Page 23]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
THE GAIN TABLE (as of 9-17-75)
X(J) J R(J) X(J) J R(J)
0 225
0 0 16 245
20 266
1 20 17 289
22 315
2 24 18 342
26 372
3 28 19 404
30 439
4 33 20 478
36 519
5 39 21 565
42 614
6 46 22 667
50 725
7 54 23 789
59 857
8 64 24 932
70 1013
9 76 25 1101
83 1197
10 90 26 1301
98 1415
11 106 27 1538
116 1672
12 126 28 1818
137 1976
13 148 29 2148
161 2335
14 175 30 2539
191 2760
15 207 31 3000
255 infinity
Cohen [Page 24]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
INDEX7 TABLE (as of 9-23-74)
X(J) J R(J) X(J) J R(J) X(J) J R(J)
0 15800 27897
0 0 21 16151 42 28106
402 16500 28311
1 804 22 16846 43 28511
1206 17190 28707
2 1608 23 17531 44 28899
2009 17869 29086
3 2411 24 18205 45 29269
2811 18538 29448
4 3212 25 18868 46 29622
3612 19195 29792
5 4011 26 19520 47 29957
4410 19841 30118
6 4808 27 20160 48 30274
5205 20475 30425
7 5602 28 20788 49 30572
5998 21097 30715
8 6393 29 21403 50 30853
6787 21706 30986
9 7180 30 22006 51 31114
7571 22302 31238
10 7962 31 22595 52 31357
8351 22884 31471
11 8740 32 23170 53 31581
9127 23453 31686
12 9512 33 23732 54 31786
9896 24008 31881
13 10279 34 24279 55 31972
10660 24548 32058
14 11039 35 24812 56 32138
11417 25073 32214
15 11793 36 25330 57 32286
12167 25583 32352
16 12540 37 25833 58 32413
12910 26078 32470
17 13279 38 26320 59 32522
13646 26557 32568
18 14010 39 26791 60 32610
14373 27020 32647
19 14733 40 27246 61 32679
15091 27467 32706
20 15447 41 27684 62 32729
15800 27897 32746
63 32758
infinity
Cohen [Page 25]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
INDEX6 TABLE (as of 9-23-74)
X(J) J R(J) X(J) J R(J)
0 22595
0 0 16 23170
804 23732
1 1608 17 24279
2411 24812
2 3212 18 25330
4011 25833
3 4808 19 26320
5602 26791
4 6393 20 27246
7180 27684
5 7962 21 28106
8740 28511
6 9512 22 28899
10279 29269
7 11039 23 29622
11793 29957
8 12540 24 30274
13279 30572
9 14010 25 30853
14733 31114
10 15447 26 31357
16151 31581
11 16846 27 31786
17531 31972
12 18205 28 32138
18868 32286
13 19520 29 32413
20160 32522
14 20788 30 32610
21403 32679
15 22006 31 32729
22595 infinity
Cohen [Page 26]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
INDEX5 TABLE (as of 9-23-74)
X(J) J R(J) X(J) J R(J)
0 22006
0 0 8 23170
1608 24279
1 3212 9 25330
4808 26320
2 6393 10 27246
7962 28106
3 9512 11 28899
11039 29622
4 12540 12 30274
14010 30853
5 15447 13 31357
16846 31786
6 18205 14 32138
19520 32413
7 20788 15 32610
22006 infinity
Cohen [Page 27]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
APPENDIX 2
IMPLEMENTATION RECOMMENDATIONS
(1) It is recommended that the priority-bit be turned ON in the
HOST/IMP header.
(2) It is recommended that in all abbreviations, "R" be used for
Receiver and "X" for Transmitter.
(3) The following identifiers and values are recommended for
implementations:
SLNCTH 30 SILENCE-THRESHOLD.
Used for LONG-SILENCE definition. See below. Measured in the
same units as GAIN, in its X-table.
TBS 1.000 sec TIME-BEGIN-SILENCE.
LONG-SILENCE is declared if GAIN<SLNCTH for more than TBS.
TAS 0.500 sec TIME-AFTER-SILENCE.
A delay introduced by the receiver after the end of
LONG-SILENCE, before restarting the playback.
TES 0.150 sec TIME-END-SILENCE.
The amount of time the transmitter backs up at the end of a
LONG-SILENCE in order to ensure a smooth transition back to
speech.
TRI 2.000 sec TIME-RESPONSE-INITIAL.
Time for waiting for response for an initial call (#1 and #3).
The initial call is repeated every TRI until an answer arrives,
or until TRIGU expires.
TRIGU 20.000 sec TIME-RESPONSE-INITIAL-GIVEUP.
If no response to an initial call is received within TRIGU
after the FIRST initial call, the system gives up, assuming the
other system is down.
TRQ 1.000 sec TIME-RESPONSE-INQUIRY.
If no response to an inquiry (#8) is received within TRQ, the
inquiry is repeated.
Cohen [Page 28]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
TRQGU 10.000 sec TIME-RESPONSE-INQUIRY-GIVEUP.
If no response to an inquiry is received within TRQGU from the
FIRST inquiry, the system gives up, assuming the other system
is down.
TBDA 3.000 sec TIME-BETWEEN-DATA-ARRIVAL.
If no data arrives within TBDA, an INQUIRY (#8) is sent. This
repeats every TBDA.
TNR 2.000 sec TIME-NOT-READY.
If the other system is in the NOT-READY (#7) state for more
than TNR, an INQUIRY (#8) is sent. This repeats every TNR.
TNRGU 10.000 sec TIME-NOT-READY-GIVEUP.
If the other system is in the NOT-READY (#7) state for more
than TNRGU, then the system gives up, assuming the other
system is down.
TBIN 3.000 sec TIME-BUFFER-IN.
The input buffer size is equivalent to the time period TBIN
(and its size is the DATA-RATE multiplied by the period
TBIN). If the INPUT QUEUE ever gets to be longer than TBIN,
data is discarded.
TBOUT 3.000 sec TIME-BUFFER-OUT.
The output buffer size is equivalent to the time period TBOUT
(and its size is the DATA-RATE multiplied by the period
TBOUT). If the OUTPUT QUEUE ever gets to be longer than
TBOUT, data is discarded.
Cohen [Page 29]
NWG/RFC 741 DC 22 Nov 77 42444
Specifications for the Network Voice Protocol (NVP)
REFERENCES
Bolt Beranek & Newman, Inc., Report No. 1822, Interface Message
Processor: Specifications for the Interconnection of a Host and an
IMP.
NSC Note 42 (in progress).
NSC Note 36, Proposal for NSC-LPC Coding/Decoding Tables, by J. D.
Markel, Speech Communications Research Laboratory, Inc., July 20,
1974.
NSC Note 45, Everything You Always Wanted to Know about Gain, by E.
Randolph Cole, USC/Information Sciences Institute, October 11, 1974.
NSC Note 56, Nothing to Lose, but Lots to Gain, by John Makhoul and
Lynn Cosell, Bolt Beranek & Newman, Inc., March 10, 1975.
NSC Note 58, Gain Again, by Randy Cole, USC/Information Sciences
Institute, March 12, 1975.
Cohen [Page 30]
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