As per Relevance of the word indicate, we have this rfc below:
Network Working Group J. K. Reynolds (ISI
Request for Comments: 978 R. Gillmann (Inner Loop
W. A. Brackenridge (Alembic
A. Witkowski (Inner Loop
J. Postel (ISI
February 1986
VOICE FILE INTERCHANGE PROTOCOL (VFIP
STATUS OF THIS
This memo describes a proposed voice file interchange format for
in the ARPA-Internet community. Suggestions for improvement
encouraged. Distribution of this memo is unlimited
1.
The purpose of the Voice File Interchange Protocol (VFIP) is
permit the interchange of various types of speech files
different systems. Currently, there are many different types
voice implementations, but no specific standard has been set with
eye towards compatability between these systems. With the
interest and development of voice, specifically in Multimedia Mail
there is an increased need to include standardized speech into
common data structure
The Voice File Interchange Protocol defines a header to describe
voice data. The 18-byte header contains the identifier, the
version number, the header length, a DTMF mask for Touch-Tones,
recording rate in bits per second, the total time in deci-
(tenths of a second), and the encoding/recording method (
Figure 1).
2. THE VOICE FILE INTERCHANGE PROTOCOL
The Voice File Interchange Protocol header is organized as follows
2.1 The Header Version
The version number is 1-byte. This first version is number one
2.2 The Header
The length is a 1-byte field indicating the length of the
header in bytes. For this first version, the length
18 (bytes).
Reynolds, et al. [Page 1]
Voice File Interchange Protocol RFC 978
2.3 The DTMF
This field describes what is known about DTMF Touch-Tones in
data. The field consists of a 16 flag bits which indicate what
known about particular DTMF tones. The 16 possible DTMF tones,
order, are: 0 1 2 3 4 5 6 7 8 9 # * A B C D. The low order
of the field is tone 0.
A 1-bit signifies that the corresponding tone is guaranteed NOT
be in the speech file. A 0-bit signifies that it may or may
be in the speech file. Therefore, a field of 16 zeros
that nothing is known about the tones. A field of 16 ones
that there are no tones in the file
2.4 Recording
The recording rate is a 32-bit field and is the approximate
in bits/second of the method used to record the speech.
variable rate methods, this may be very approximate
2.5 Total
A 32-bit number indicating the total time of the recording
deci-seconds. For example, 600 indicates 1 minute of speech
2.6 Methods of Encoding/
This 6-byte ASCII field indicates the method
encoding/recording. Names shorter than six characters are
out to the right with blanks (the ASCII space character, code 32
decimal). For comparisons, the names are case insensitive
Some known methods of Encoding/Recording are
TI - The Texas Instruments card for the IBM PC [5].
IBM - PC Voice Communications Options
NVP-1 and NVP-2 - Network Voice Protocol [1,2].
COMPUT - Computalker card for the IBM PC [4].
Reynolds, et al. [Page 2]
Voice File Interchange Protocol RFC 978
3.
This 18-byte header will permit interchange of speech files
different systems, as well as facilitate automatic conversion
formats. The header does not have to be prepended to the speech
proper; it may be in the form of a separate associated file, if
is more convenient
<------------16-bits------------>
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Version | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| -DTMF- |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| -Recording- |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| -Rate- |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| -Total- |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| -Time- |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| M | E |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| T | H |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| O | D |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1
Reynolds, et al. [Page 3]
Voice File Interchange Protocol RFC 978
4.
Example 1 is for one minute of 2400 bps NVP-2 speech. Nothing
known about DTMF tones in the data
<------------16-bits------------>
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 1 | 18 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 2400 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 600 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| N | V |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| P | - |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 2 | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Example 1
Reynolds, et al. [Page 4]
Voice File Interchange Protocol RFC 978
Example 2 shows the header for 10 seconds of 1200 bps TI speech,
none of the DTMF tone 0-9 in the data, but no information
tones *, #, A-D
<------------16-bits------------>
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 1 | 18 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 1023 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 1200 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 100 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| T | I |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Example 2
[1] Cohen, Danny, "Specifications for the Network Voice
(NVP)", RFC 741 (NIC 42444), USC/Information Sciences Institute
January 1976.
[2] Cohen, Danny, "A Network Voice Protocol (NVP-II)",
USC/Information Sciences Institute, April 1981.
[3] O'Leary, G. C., "Local Access Area Facilities for Packet Voice",
MIT/LL, October 1980.
[4] Computalker, "Compu Phone for the IBM PC/XT", Santa Monica
California, August 1985.
[5] Texas Instruments, Inc., "The TI Speech Application Tool
Guide", TI Part #2232384-1, May 1985.
Reynolds, et al. [Page 5]
if you see any problems within the linking, don't worry be happy,
this is version 0.1 of the Relevance System and you gotta expect some crappy subroutines sometimes,
just be content we did not write this in Java, which would have made this "bigger and better" HAHAHHA.
RFC documents can be found at I.E.T.F.
Relevance System Copyright © 2002 Spectrum WorldResearch
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