This Recommendation concerns translating equipments with the exception of: channel-translating equipment, in respect of which Recommendations G.232, G.234 [1] and G.235 should be consulted; equipment for translation into the line-frequency band; the Recommendations relating to the various line systems should be consulted.
ITU-T G.233 SPANISH-1993 Referenced Document
ITU-T J.21 Performance Characteristics of 15 kHz-Type Sound-Programme Circuits - Circuits for High Quality Monophonic and Stereophonic Transmissions - Television and Sound Transmission (Study Group 9) 12 pp*， 1994-01-01 Update
ITU-T J.31 CHARACTERISTICS OF EQUIPMENT AND LINES USED FOR SETTING UP 15 kHz TYPE SOUND - PROGRAMME CIRCUITS