1、 TIA STANDARD Enhanced Variable Rate Codec, Speech Service Options 3, 68, and 70 for Wideband Spread Spectrum Digital Systems TIA-127-C (Revision to TIA-127-B) February 2007 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electronic Indust
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19、S FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF
20、 THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-127-C iFOREWORD 1
21、 These technical requirements form a standard for Service Options 3, 68, and 70, enhanced variable 2 rate, two way speech service options known as EVRC-A, EVRC-B, and EVRC-WB respectively. 3 These service options communicate at one of four channel rates corresponding to the 9600 bps, 4 4800 bps, 240
22、0, and 1200 bps frame rates. However, Service Option 3 does not use 2400 bps 5 channel frame rate. The speech coder source bit-rate corresponding to the above mentioned 4 6 channel rate are 8550, 4000, 2000, and 800 bps. Service Options 68, and 70 have the capability to 7 operate in multiple operati
23、ng points at different average rates of operation that can be used for 8 obtaining different system capacity while trading off speech quality gracefully. 9 This standard does not address the quality or reliability of Service Options 3. 68, and 70 nor does it 10 cover equipment performance or measure
24、ment procedures. 11 12 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-127-C iiNOTES 1 1. The appropriate version of the Minimum Performance Standard for the enhanced variab
25、le rate 2 codecs, EVRC-A, EVRC-B, and EVRC-WB provides specifications and measurement methods. 3 2. “Base station” refers to the functions performed on the landline side, which are typically distributed 4 among a cell, a sector of a cell, a mobile switching center, and a personal communications swit
26、ching 5 center. 6 3. This document uses the following verbal forms: “Shall” and “shall not” identify requirements to be 7 followed strictly to conform to the standard and from which no deviation is permitted. “Should” and 8 “should not” indicate that one of several possibilities is recommended as pa
27、rticularly suitable, without 9 mentioning or excluding others; that a certain course of action is preferred but not necessarily 10 required; or that (in the negative form) a certain possibility or course of action is discouraged but not 11 prohibited. “May” and “need not” indicate a course of action
28、 permissible within the limits of the 12 standard. “Can” and “cannot” are used for statements of possibility and capability, whether material, 13 physical, or causal. 14 4. Footnotes appear at various points in this specification to elaborate and further clarify items 15 discussed in the body of the
29、 specification. 16 5. Unless indicated otherwise, this document presents numbers in decimal form. 17 Binary numbers are distinguished in the text by the use of single quotation marks. In some tables, 18 binary values may appear without single quotation marks if table notation clearly specifies that
30、19 values are binary. The character x is used to represent a binary bit of unspecified value. For 20 example xxx00010 represents any 8-bit binary value such that the least significant five bits equal 21 00010. 22 Hexadecimal numbers (base 16) are distinguished in the text by use of the form 0xhK h,
31、where 23 hK h represents a string of hexadecimal digits. For example, 0x2FA1 represents a number whose 24 binary value is 10111110100001 and whose decimal value is 12913. 25 26 27 28 29 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduct
32、ion or networking permitted without license from IHS-,-,-TIA-127-C iiiNOTES 1 6. The following conventions apply to mathematical expressions in this standard: 2 x indicates the largest integer less than or equal to x: 1.1 = 1, 0.1 = 1, and 1.1 =-2. 3 x indicates the smallest integer greater than or
33、equal to x: 1.1 = 2, 0.2 = 2, and 1.1 =-4 1. 5 x indicates the absolute value of x: 17 =17, 17 =17. 6 indicates exclusive OR. 7 min(x, y) indicates the minimum of x and y. 8 max(x, y) indicates the maximum of x and y. 9 In figures, indicates multiplication. In formulas within the text, multiplicatio
34、n is implicit. For 10 example, if h(n) and pL(n) are functions, then h(n) pL(n) = h(n) pL(n). 11 x mod y indicates the remainder after dividing x by y: x mod y = x - (y yx / ). 12 round(x) is traditional rounding: round(x) = sign(x) 5.0+x , where 13 () .0x10x1xsign=14 indicates summation. If the sum
35、mation symbol specifies initial and terminal values, and the 15 initial value is greater than the terminal value, then the value of the summation is 0. For example, 16 if N=0, and if f(n) represents an arbitrary function, then 17 =N1n0.f(n)18 The bracket operator, , isolates individual bits of a bin
36、ary value. VARn refers to bit n of the 19 binary representation of the value of the variable VAR, such that VAR0 is the least significant bit 20 of VAR. The value of VARn is either 0 or 1. 21 Unless otherwise specified log(x) denotes logarithm at base 10 throughout this document. 22 Copyright Teleco
37、mmunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-127-C ivNORMATIVE REFERENCES 1 Ref. Document Standards N1 Upper Layer (Layer 3) Signalling Standard for cdma2000 Spread Spectrum Systems TIA-
38、2000.5-D, March 2004 N2 Discontinuous Transmission (DTX) of Speech in cdma2000 Systems TIA-1095, April 2006 N3 Cellular System Recommended Minimum Performance Standards for Full-Rate Speech Codes (superceded by TIA -95-B) TIA/EIA/IS-95, May 1992 N4 Mobile Station-Base Station Compatibility Standard
39、for Wideband Spread Spectrum Cellular Systems TIA-95-B-04(R2004), October 2004 N5 Introduction to cdma2000 Standards for Spread Spectrum Systems TIA-2000.1-D, tbd INFORMATIVE REFERENCES 2 Ref. Document Standards S1 Telecommunications Telephone Terminal Equipment Transmission Requirements for Digital
40、 Wireline Telephones ANSI/EIA/TIA-579-A-98 S2 Pulse Code Modulation (PCM) of Voice Frequencies ITU-T Recommendation G.711, November 1988 S3 Transmission Performance Characteristics of Pulse Code Modulation ITU-T Recommendation G.712, November 2001 S4 IEEE Standard Methods for Measuring Transmission
41、Performance of Analog and Digital Telephone Sets IEEE Standard 269-2002, 2002 S5 Method for Determining Objective Loudness Ratings of Telephone Connections IEEE Standard 661-1979, 1979 S6 Minimum Performance Specification for the Enhanced Variable Rate Codec, Speech Service Option 3 for Spread Spect
42、rum Digital Systems TIA/EIA/IS-718, July 1998 S7a Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems TIA/EIA/IS-127-1, August 1998 S7b Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems TIA/EIA/IS-127-3,
43、September 2001 S8 Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems TIA-127-A, May 2004 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from
44、IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or
45、networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-127-C vRef. Document S9 Digital network echo cancellers ITU-T Recommendatio
46、n G.168, August 2004 S10 Operational and interworking requirements for DCEs operating in the text telephone mode ITU-T Recommendation V.18, November 2000 S11 Transmission Characteristics for Wideband (150-7000 Hz) Digital Handset Telephones. ITU-T Recommendation P.311, February, 1998 S12 Transmissio
47、n Characteristics for Wideband (150-7000 Hz) Digital Hands-free Telephony Terminals. ITU-T Recommendation P.341, February, 1998 Resources R1 Proakis, J. G. and Manolakis, D. G., Introduction to Digital Signal Processing, New York, Macmillan 1988, pp. 721-722 R2 Rabiner, L. R. and Schafer, R. W., Dig
48、ital Processing of Speech Signals New Jersey, Prentice-Hall Inc., 1978 R3 Crochiere, R. E. and Rabiner L. R., Multirate Digital Signal Processing New Jersey, Prentice-Hall Inc., 1983 R4 Oppenheim, A. V. and Schafer, R. W., Digital Signal Processing New Jersey, Prentice-Hall Inc., 1975 R5 Proakis, J. G. and Manolakis, D. G., Introduction to Digital Signal Processing New York, Macmillan, 1988 R6 Dellar, J. R., Proakis, J. G., Hansen, J. H. L., Discrete-Time Processing of Speech Signals New York, Macmillan, 1993 R7 A
