TIA-718-E-1[E]:2013

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Minimum Performance Specification for the Enhanced Variable Rate Codec, Speech Service Options 3, 68, 70, 73 and 77 for Wideband Spread Spectrum Digital Systems

Published By	Publication Date	Number of Pages
TIA	2013	222

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Description

This document specifies the procedures to test implementations
of EVRC-A, EVRC-B, EVRC-WB, EVRC-NW or EVRC-NW2K compatible
variable-rate speech codecs either by meeting the bit-exact
implementation, or meeting recommended minimum performance
requirements. The EVRC-A is the Service Option 3 (SO 3) speech
codec, the EVRC-B is the Service Option 68 (SO 68) speech
codec, the EVRC-WB is the Service Option 70 (SO 70) speech
codec, the EVRC-NW is the Service Option 73 (SO 73) speech
codec, and the EVRC-NW2K is the Service Option 77 (SO 77) speech
codec all described in [1]. The procedures specified in this
document for the SO 3 speech codec are fully consistent with
those contained in [3]. The SO 3 speech codec is used to digitally
encode the speech signal for transmission at a variable data
rate of 8550 bps, 4000 bps, or 800 bps. The SO 68 speech codec
is used to digitally encode the speech signal for transmission at a
variable data rate of 8550 bps, 4000 bps, 2000 bps, or 800
bps. The SO 70 speech codec is used to digitally encode the speech
signal for transmission at a variable data rate of 8550 bps, 4000
bps, or 800 bps. The SO 73 speech codec is used to digitally
encode the speech signal for transmission at a variable data rate
of 8550 bps, 4000 bps, 2000 bps, or 800 bps. The SO 77 is same
as SO 73 except it includes a maximum rate 2 kbps mode speech
codec.

Like some other speech coding standards, this standard provides
a bit-exact method of verifying the test codec for minimum
performance. In this optional procedure, a given set of test
vectors are input to the test codec and the output vectors from the
test codec must be bit-exact with the output vectors given in the
software distribution which is associated with this standard. If
they are bit-exact, the test codec passes the minimum performance
requirement and no further testing is required. The bit-exact mode
of testing, however, is only applicable to codecs whose design
conforms in all respects to the algorithmic description of the
specific EVRC service option, including the noise suppression, rate
determination and post-filter components.

Should the candidate EVRC differ in any of these components, the
test codec shall be tested using the objective and subjective tests
prescribed by this standard. That is, EVRC-compliance of a "test
codec" can be achieved by either:

• Complying with Sections 2.1.1 and 2.1.2 (SO 3), or Sections
2.2.1 and 2.2.2 (SO 68), or Sections 2.3.1 and 2.3.2 (SO 70), or
Section 2.4.1 and 2.4.2 (SO 73), or Section 2.5.1 and 2.5.2 (SO 77)
and demonstrating bit-exactness according to the procedure
described in Section 3.1.4 (SO 3), or Section 3.2.4 (SO 68), or
Section 3.3.4 (SO 70), or Section 3.4.4 (SO 73), or Section 3.5.4
(SO 77) respectively.

• Following the objective and subjective testing procedures
set forth in Sections 2.1.1 and 38 2.1.2, or Sections 2.2.1 and
2.2.2, or Sections 2.3.1 and 2.3.2, or Section 2.4.1 and 2.4.2 3
(SO 73), or Section 2.5.1 and 2.5.2 (SO 77) of this standard.

Additional information