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2、of this document Click the link(s) below to access the content and use normal procedures for downloading or opening the files. TIA-733-A SF TIA-733-A Software Information contained in the above is the property of the Copyright holder and all Notice of Disclaimer that a certain course of action is pr
3、eferred but not necessarily required; or that (in the 9negative form) a certain possibility or course of action is discouraged but not prohibited. “May” and “need 10not” indicate a course of action permissible within the limits of the standard. “Can” and “cannot” are used 11for statements of possibi
4、lity and capability, whether material, physical, or causal. 124. Footnotes appear at various points in this specification to elaborate and further clarify items discussed in 13the body of the specification. 145. Unless indicated otherwise, this document presents numbers in decimal form. 15Binary num
5、bers are distinguished in the text by the use of single quotation marks. In some tables, binary 16values may appear without single quotation marks if table notation clearly specifies that values are binary. 17The character x is used to represent a binary bit of unspecified value. For example xxx0001
6、0 represents 18any 8-bit binary value such that the least significant five bits equal 00010. 19Hexadecimal numbers (base 16) are distinguished in the text by use of the form 0xh?h where h?h 20represents a string of hexadecimal digits. For example, 0x2fa1 represents a number whose binary value is 211
7、0111110100001 and whose decimal value is 913. 226. The following conventions apply to mathematical expressions in this standard: 23xg171g187g172g188indicates the largest integer less than or equal to x: 1.1g171g187g172g188= 1, 1.0g171g187g172g188= 1. 24xg170g186g171g187indicates the smallest integer
8、 greater than or equal to x: 1.1g170g186g171g187= 2, 2.0g170g186g171g187= 2. 25| x | indicates the absolute value of x: |-17|=17, |17|=17. 26g134 indicates exclusive OR. 27min(x, y) indicates the minimum of x and y. 28max(x, y) indicates the maximum of x and y. 29In figures, g133 indicates multiplic
9、ation. In formulas within the text, multiplication is implicit. For 30example, if h(n) and pL(n) are functions, then h(n) pL(n) = h(n) g133 pL(n).31x mod y indicates the remainder after dividing x by y: x mod y = x - yg11 g12/x yg171g187g172g18832round(x) is traditional rounding: round(x) = 0.5x g14
10、g171g187g172g18833TIA-733-A xi 1 x 0 sign(x)=-1 x 0g116g173g174g100g1751g166 indicates summation. If the summation symbol specifies initial and terminal values, and the initial 2value is greater than the terminal value, then the value of the summation is 0. For example, if N=0, and 3if f(n) represen
11、ts an arbitrary function, then 41() 0Nnfng32g32g1665The bracket operator, , isolates individual bits of a binary value. VARn refers to bit n of the binary 6representation of the value of the variable VAR, such that VAR0 is the least significant bit of VAR. 7The value of VARn is either 0 or 1. 8This
12、standard uses the two-sided z-transform as given below. See Oppenheim, A. V. and Schafer, R. 9W., Digital Signal Processing, pp. 45 - 86. 101()iiF zxzg102g16g32g16g102g32g1661112TIA-733-A xii REFERENCES1The following standards contain provisions which, through reference in this text, constitute prov
13、isions of this 2Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, 3and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the 4most recent editions of the standards indicated below. ANSI
14、 and TIA maintain registers of currently valid 5national standards published by them. 67American National Standards: 81. ANSI/EIA/TIA-579-A-98, Telecommunications Telephone Terminal Equipment Transmission 9Requirements for Digital Wireline Telephones.102. ANSI J-STD-008, Personal Station-Base Statio
15、n Compatibility Requirements for 1.8 to 2.0 GHz 11Code Division Multiple Access (CDMA) Personal Communications Systems.12Other Standards: 133. ITU-T Recommendation G.711, Pulse Code Modulation (PCM) of Voice Frequencies, Vol. III, 14Geneva 1972. 154. ITU-T Recommendation G.714, Separate Performance
16、Characteristics for the Encoding and 16Decoding Sides of PCM Channels Applicable to 4-Wire Voice-Frequency Interfaces, Blue Book, 17Vol. III, Melbourne 1988. 185. IEEE Standard 269-1992, IEEE Standard Methods for Measuring Transmission Performance of 19Analog and Digital Telephone Sets, 1992. 206. I
17、EEE Standard 661-1979, Method for Determining Objective Loudness Ratings of Telephone 21Connections, 1979. 227. TIA/EIA/IS-95-A, Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband 23Spread Spectrum Cellular System. All references to TIA/EIA/IS-95-A shall be inclusive of text 2
18、4adopted by TSB74. 258. TIA/EIA/IS-125-A, Minimum Performance Standard for Digital Cellular Wideband Spread 26Spectrum Speech Service Option 1, May 1995. 279. TIA/EIA/IS-733, High Rate (13 kbps) Speech SO, December 1999. 2810. TIA/EIA/IS-736-A, Minimum Performance Standard for the High Rate Speech S
19、ervice Option for 29Wideband Spread Spectrum Communication Systems, December 1999.3011. TSB74, Telecommunications Systems Bulletin: Support for 14.4 kbps Data Rate and PCS 31Interaction for Wideband Spread Spectrum Cellular Systems, December 1995. 3233TIA-733-A 1-1 1 GENERAL11.1 Terms and Numeric In
20、formation 2Autocorrelation Function. A function showing the relationship of a signal with a time-shifted version of 3itself.4Base Station. A station in the Public Radio Telecommunications Service, other than a mobile station, used for 5radio communications with mobile stations. 6CELP. See Code Excit
21、ed Linear Predictive Coding. 7Codec. The combination of an encoder and decoder in series (encoder/decoder). 8Code Excited Linear Predictive Coding (CELP). A speech coding algorithm. CELP coders use codebook 9excitation, a long-term pitch prediction filter, and a short-term formant prediction filter.
22、10Codebook. A set of vectors used by the speech codec. For each speech codec codebook subframe, one 11particular vector is chosen and used to excite the speech codecs filters. The codebook vector is chosen to 12minimize the weighted error between the original and synthesized speech after the pitch a
23、nd formant synthesis 13filter coefficients have been determined. 14Coder. Same as “encoder.” 15Decoder. Generally, a device for the translation of a signal from a digital representation into an analog format. 16For this standard, a device which converts speech encoded in the format specified in this
24、 standard to analog or 17an equivalent PCM representation. 18DECSD. Decoder Seed. 19Encoder. Generally, a device for the translation of a signal into a digital representation. For this standard, a 20device which converts speech from an analog or its equivalent PCM representation to the digital repre
25、sentation 21described in this standard. 22Formant. A resonant frequency of the human vocal tract causing a peak in the short term spectrum of speech. 23IIR Filter. An infinite-duration impulse response filter is a filter for which the output, in response to an 24impulse input, never totally converge
26、s to zero. This term is usually used in reference to digital filters. 25Linear Predictive Coding (LPC). A method of predicting future samples of a sequence by a linear 26combination of the previous samples of the same sequence. Linear Predictive Coding is frequently used in 27reference to a class of
27、 speech codecs. 28Line Spectral Pair (LSP). A representation of digital filter coefficients in a pseudo-frequency domain. This 29representation has good quantization and interpolation properties. 30LPC. See Linear Predictive Coding. 31LSB. Least significant bit.32LSP. See Line Spectral Pair. 33MSB.
28、Most significant bit. 34Mobile Station. A station in the Public Radio Telecommunications Service intended to be used while in 35motion or during halts at unspecified points. 36TIA-733-A 1-2 Normalized Autocorrelation Function (NACF). A measure used to determine the pitch period and the 1degree of pe
29、riodicity of the input speech. This measure is useful in distinguishing voiced from unvoiced 2speech.3Packet. The unit of information exchanged between service option applications in the base station and the 4mobile station. 5Pitch. The fundamental frequency in speech caused by the periodic vibratio
30、n of the human vocal cords. 6RDA. Rate Determination Algorithm.7Receive Objective Loudness Rating (ROLR). A measure of receive audio sensitivity. ROLR is a frequency-8weighted ratio of the line voltage input signal to a reference encoder to the acoustic output of the receiver. 9IEEE 269 defines the
31、measurement of sensitivity and IEEE 661 defines the calculation of objective loudness 10rating. 11SPL. Sound Pressure Level.12Transmit Objective Loudness Rating (TOLR). A measure of transmit audio sensitivity. TOLR is a 13frequency-weighted ratio of the acoustic input signal at the transmitter to th
32、e line voltage output of the 14reference decoder. IEEE 269 defines the measurement of sensitivity and IEEE 661 defines the calculation of 15objective loudness rating. 16Voiced Speech. Speech generated when the vocal cords are vibrating at a fundamental frequency. 17Characterized by high energy, peri
33、odicity, and a large ratio of energy below 2 kHz to energy above 2 kHz. 18Unvoiced Speech. Speech generated by forcing air through constrictions in the vocal tract without vibration of 19the vocal cords. Characterized by a lack of periodicity, and a near-unity ratio of energy below 2 kHz to energy 2
34、0above 2 kHz. 21WAEPL. Weighted Acoustic Echo Path Loss. A measure of the echo performance under normal 22conversation. ANSI/EIA/TIA-579 defines the measurement of WAEPL. 23Zero Input Response (ZIR). The filter output caused by the non-zero initial state of the filter when no input is 24present.25Ze
35、ro State Response (ZSR). The filter output caused by an input when the initial state of the filter is zero. 26ZIR. See Zero Input Response. 27ZSR. See Zero State Response. 28TIA-733-A 2-1 2 SERVICE OPTION 17: VARIABLE DATA RATE TWO-WAY VOICE 12.1 General Description 2Service Option 17 provides two-w
36、ay voice communications between the base station and the mobile station 3using the dynamically variable data rate speech codec algorithm described in this standard. The service option 4takes voice samples and generates an encoded speech packet for every Traffic Channel frame.1The receiving 5station
37、generates a speech packet from every Traffic Channel frame and supplies it to the service option for 6decoding into voice samples. 7The two speech codecs communicate at one of four rates: Rate 1, Rate 1/2, Rate 1/4, and Rate 1/8. 8In case of a discrepancy between the master C simulation and the algo
38、rithmic description, the master C 9simulation will prevail. The master C simulation is contained in the database of the performance specification 10for this algorithm, TIA/EIA/IS-736. 112.2 Service Option Number 12The variable data rate two-way voice service option using the speech codec algorithm d
39、escribed by this 13standard shall use service option number 17 and is called Service Option 17. 142.3 Multiplex Option 152.3.1 Required Multiplex Option Support 16Service Option 17 shall support an interface with Multiplex Option 2 (see TIA/EIA/IS-95). Speech packets for 17Service Option 17 shall on
40、ly be transported as primary traffic. 182.3.2 Interface to Multiplex Option 2 192.3.2.1 Transmitted Packets 20The service option shall generate and supply exactly one packet to the multiplex sublayer every 20 ms. The 21packet contains the service option information bits which are transmitted as prim
41、ary traffic. 22The service option shall operate in one of two modes: 23In the first mode, the packet supplied by the service option shall be one of the 5 types shown in Table 2.3.2.1-1. 24Upon command, the service option shall generate Blank packets. Also, upon command, the service option shall 25ge
42、nerate a non-blank packet with a maximum rate of Rate 1/2. 26In the second mode, the packet supplied by the service option shall be one of the types shown in Table 2.3.2.1-271, excluding the Rate 1 packet. Upon command, the service option shall generate a Blank packet. Also upon 28command, the servi
43、ce option shall generate a non-blank packet with a maximum rate of Rate 1/4. 291IS-95 “Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System” and J-STD-008 “Personal Station-Base Station Compatibility Requirements for 1.8 to 2.0 GHz Code Division M
44、ultiple Access (CDMA) Personal Communications Systems” use the term frame to represent a 20 ms grouping of data on the Traffic Channel. Common speech codec terminology also uses the term frame to represent a quantum of processing. For Service Option 17, the speech codec frame corresponds to speech s
45、ampled over 20 ms. The speech samples are processed into a packet. This packet is transmitted in a Traffic Channel frame. TIA-733-A 2-2 1Table 2.3.2.1-1. Packet Types Supplied by Service Option 17 to the Multiplex 2Sublayer3Packet Type Bits per Packet Rate 1 266 Rate 1/2 124 Rate 1/4 54 Rate 1/8 20
46、Blank 0 42.3.2.2 Received Packets 5The multiplex sublayer in the mobile station categorizes every received Traffic Channel frame and supplies the 6packet type and accompanying bits, if any, to the service option as shown in Table 2.3.2.2-1. The service 7option processes the bits of the packet as des
47、cribed in 2.4. The first five received packet types shown in 8Table 2.3.2.2-1 correspond to the transmitted packet types shown in Table 2.3.2.1-1. When the multiplex 9sublayer determines that a received frame is in error, the multiplex sublayer supplies an insufficient frame 10quality (erasure) pack
48、et to the service option. 1112Table 2.3.2.2-1. Packet Types Supplied by the Multiplex Sublayer to Service 13Option 17 14Packet Type Bits per Packet Rate 1 266 Rate 1/2 124 Rate 1/4 54 Rate 1/8 20 Blank 0 Insufficient frame quality (erasure) 0 152.3.3 Service Negotiation 16The mobile station and base
49、 station shall perform service negotiation for the service option as described in IS-1795 or J-STD-008, and the negotiated service configuration shall include only valid attributes for the service 18option as specified in Table 2.3.3-1. 1920TIA-733-A 2-3 Table 2.3.3-1. Valid Service Configuration Attributes for Service Option 17 1Service Configuration Attribute Valid Selections Forward Multiplex Option Multiplex Option 2 Reverse Multiplex Option Multiplex Option 2 Forward Transmission Rates Rate Set 2 with all four rates enabled Reverse Transmission Rates Rate Set
