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+ 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 MEMO
+
+ This memo describes a proposed voice file interchange format for use
+ in the ARPA-Internet community. Suggestions for improvement are
+ encouraged. Distribution of this memo is unlimited.
+
+1. INTRODUCTION
+
+ The purpose of the Voice File Interchange Protocol (VFIP) is to
+ permit the interchange of various types of speech files between
+ different systems. Currently, there are many different types of
+ voice implementations, but no specific standard has been set with an
+ eye towards compatability between these systems. With the increasing
+ interest and development of voice, specifically in Multimedia Mail,
+ there is an increased need to include standardized speech into a
+ common data structure.
+
+ The Voice File Interchange Protocol defines a header to describe the
+ voice data. The 18-byte header contains the identifier, the header
+ version number, the header length, a DTMF mask for Touch-Tones, the
+ recording rate in bits per second, the total time in deci-seconds
+ (tenths of a second), and the encoding/recording method (see
+ Figure 1).
+
+2. THE VOICE FILE INTERCHANGE PROTOCOL HEADER
+
+ The Voice File Interchange Protocol header is organized as follows:
+
+ 2.1 The Header Version Number
+
+ The version number is 1-byte. This first version is number one.
+
+ 2.2 The Header Length
+
+ The length is a 1-byte field indicating the length of the entire
+ header in bytes. For this first version, the length is
+ 18 (bytes).
+
+
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+
+Reynolds, et al. [Page 1]
+
+
+
+Voice File Interchange Protocol RFC 978
+
+
+ 2.3 The DTMF Mask
+
+ This field describes what is known about DTMF Touch-Tones in the
+ data. The field consists of a 16 flag bits which indicate what is
+ known about particular DTMF tones. The 16 possible DTMF tones, in
+ order, are: 0 1 2 3 4 5 6 7 8 9 # * A B C D. The low order bit
+ of the field is tone 0.
+
+ A 1-bit signifies that the corresponding tone is guaranteed NOT to
+ be in the speech file. A 0-bit signifies that it may or may not
+ be in the speech file. Therefore, a field of 16 zeros denotes
+ that nothing is known about the tones. A field of 16 ones denotes
+ that there are no tones in the file.
+
+ 2.4 Recording Rate
+
+ The recording rate is a 32-bit field and is the approximate rate
+ in bits/second of the method used to record the speech. For
+ variable rate methods, this may be very approximate.
+
+ 2.5 Total Time
+
+ A 32-bit number indicating the total time of the recording in
+ deci-seconds. For example, 600 indicates 1 minute of speech.
+
+ 2.6 Methods of Encoding/Recording
+
+ This 6-byte ASCII field indicates the method of
+ encoding/recording. Names shorter than six characters are padded
+ 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].
+
+
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+Reynolds, et al. [Page 2]
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+
+
+Voice File Interchange Protocol RFC 978
+
+
+3. SUMMARY
+
+ This 18-byte header will permit interchange of speech files between
+ different systems, as well as facilitate automatic conversion between
+ formats. The header does not have to be prepended to the speech file
+ proper; it may be in the form of a separate associated file, if that
+ is more convenient.
+
+ <------------16-bits------------>
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Version | Length |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | -DTMF- |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | -Recording- |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | -Rate- |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | -Total- |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | -Time- |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | M | E |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | T | H |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | O | D |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Figure 1
+
+
+
+
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+Reynolds, et al. [Page 3]
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+
+Voice File Interchange Protocol RFC 978
+
+
+4. EXAMPLES
+
+ Example 1 is for one minute of 2400 bps NVP-2 speech. Nothing is
+ known about DTMF tones in the data.
+
+ <------------16-bits------------>
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 1 | 18 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 0 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 2400 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 600 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | N | V |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | P | - |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 2 | <sp> |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Example 1
+
+
+
+
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+Reynolds, et al. [Page 4]
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+
+Voice File Interchange Protocol RFC 978
+
+
+ Example 2 shows the header for 10 seconds of 1200 bps TI speech, with
+ none of the DTMF tone 0-9 in the data, but no information about
+ tones *, #, A-D.
+
+ <------------16-bits------------>
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 1 | 18 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 1023 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 1200 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | 100 |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | T | I |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | <sp> | <sp> |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | <sp> | <sp> |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Example 2
+
+REFERENCES
+
+ [1] Cohen, Danny, "Specifications for the Network Voice Protocol
+ (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 Kit
+ Guide", TI Part #2232384-1, May 1985.
+
+
+
+
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+Reynolds, et al. [Page 5]
+