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eLibrary > BS IEC 62106-1:2018 Radio data system (RDS). VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz - Modulation characteristics and baseband coding >

BS IEC 62106-1:2018 Radio data system (RDS). VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz - Modulation characteristics and baseband coding, 2018

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BS IEC 62106-1:2018 Radio data system (RDS). VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz - Modulation characteristics and baseband coding, 2018

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CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Abbreviated terms
3.3 Notation and conventions [Go to Page]
3.3.1 Hexadecimal notation
3.3.2 Nomenclature for group types
3.3.3 Capitalized RDS terms
4 Modulation characteristics of the data channels [Go to Page]
4.1 General
4.2 Subcarrier generation
Figures [Go to Page]
Figure 1 – Block diagram of data-stream 0 radio-data equipment at the transmitter
4.3 Data-stream subcarrier frequencies for all possible streams
Figure 2 – Block diagram of a typical data-stream 0 radio-data receiver/decoder
Figure 3 – Subcarriers for RDS data-stream 0 andadditional RDS2 data-streams 1, 2 and 3
4.4 Subcarrier phase requirements
4.5 Subcarrier level requirements
4.6 Data-stream modulation requirements
4.7 Clock-frequency and data-rate
4.8 Differential coding on all data-streams
4.9 Data-channel spectrum shaping on all data-streams
Tables [Go to Page]
Table 1 – Encoding rules
Table 2 – Decoding rules
Figure 4 – Amplitude response of the specified transmitteror receiver data-shaping filter
Figure 5 – Amplitude response of the combined transmitterand receiver data-shaping filters
Figure 6 – Spectrum of biphase coded radio-data signals
4.10 Symbol phase shifts of data across data-streams
Figure 7 – Time-function of a single biphase symbol
Figure 8 – 57 kHz modulated data-signal
5 Baseband coding [Go to Page]
5.1 Data-stream baseband coding structure
5.2 Data-stream error protection
Figure 9 – Structure of the baseband coding
Table 3 – Phase shifts of data across data-streams 1-3with respect to data-stream 0
5.3 Synchronization of blocks and groups across all streams
6 Transmission options on data-streams 1, 2 and 3
Annex A (normative)Offset words to be used for group and block synchronization [Go to Page]
Table A.1 – Offset word codes
Annex B (informative)Theory and implementation of the modified shortened cyclic code [Go to Page]
B.1 General
B.2 Encoding procedure
Figure B.1 – Generator matrix of the basicshortened cyclic code in binary notation
Figure B.2 – Shift-register implementation of the encoder
B.3 Decoding procedure
Figure B.3 – Parity-check matrix of the basic shortened cyclic code
Table B.1 – Offset word syndromes using matrix of Figure B.3
Figure B.4 – Shift-register implementation of the decoder
Annex C (informative) Implementation of group and block synchronization using the modified shortened cyclic code [Go to Page]
C.1 Theory
C.2 Shift register arrangement for deriving group and block synchronization information
Figure C.1 – Group and block synchronization detection circuit
Table C.1 – Offset word syndromes for group and block synchronization
Bibliography [Go to Page]

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BS IEC 62106-1:2018 Radio data system (RDS). VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz - Modulation characteristics and baseband coding, 2018

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