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| J.21 : Performance characteristics of 15 kHz-type sound-programme circuits - Circuits for high quality monophonic and stereophonic transmissions | 
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| Formerly ITU-R Rec. CMTT 505-5 |  |  |  |  
| In force components |  
| Number 
 | Title | Status |  
| J.21 (08/94) 
 | Performance characteristics of 15 kHz-type sound-programme circuits - Circuits for high quality monophonic and stereophonic transmissions Formerly ITU-R Rec. CMTT 505-5
 | In force 
 |  
| 
 |  
| Superseded and Withdrawn components |  
| Number 
 | Title | Status |  
| J.21 (11/88) 
 | Performance characteristics of 15 kHz-type sound-programme circuits Former CCIR Rec. 505
 | Superseded 
 |  |