Terrestrial television systems
ITU standards
On an international conference in Stockholm in 1961, the International Telecommunication Union designated standards for broadcast television systems. Each standard is designated a letter (A-M); in combination with a color system (NTSC, PAL, SECAM), this completely specifies all of the monaural analog television systems in the world (for example, PAL-B, NTSC-M, etc.).

Terrestrial television systems

Section Title: ITU standards
Table Section Text: On an international conference in Stockholm in 1961, the International Telecommunication Union designated standards for broadcast television systems. Each standard is designated a letter (A-M); in combination with a color system (NTSC, PAL, SECAM), this completely specifies all of the monaural analog television systems in the world (for example, PAL-B, NTSC-M, etc.).

Standard	Introduced	Lines	Frame rate	Channel bandwidth	Video bandwidth (MHz)	Vision sound carrier separation (MHz)	Vestigial sideband (MHz)	Vision modulation	Sound modulation	Frequency of chrominance subcarrier (MHz)	Vision/sound power ratio	Usual color

A	1936	405	25	5	3	−3.5	0.75	pos.	AM	4:1	none

B	1950	625	25	7	5	+5.5	0.75	neg.	FM	4.43	PAL/SECAM

C	1953	625	25	7	5	+5.5	0.75	pos.	AM	none

D	1948	625	25	8	6	+6.5	0.75	neg.	FM	4.43	SECAM/PAL

E	1949	819	25	14	10	±11.15	2.00	pos.	AM	none

F	819	25	7	5	+5.5	0.75	pos.	AM	none

G	625	25	8	5	+5.5	0.75	neg.	FM	4.43	5:1	PAL/SECAM

H	625	25	8	5	+5.5	1.25	neg.	FM	4.43	5:1	PAL

I	1962	625	25	8	5.5	+5.9996	1.25	neg.	FM	4.43	5:1	PAL

J	1953	525	30	6	4.2	+4.5	0.75	neg.	FM	3.58	NTSC

K	625	25	8	6	+6.5	0.75	neg.	FM	4.43	5:1	SECAM/PAL

K'	625	25	8	6	+6.5	1.25	neg.	FM	4.43	SECAM

L	1970s	625	25	8	6	6.5	1.25	pos.	AM	4.43	8:1	SECAM

M	1941	525	30	6	4.2	+4.5	0.75	neg.	FM	3.58	NTSC

N	1951	625	25	6	4.2	+4.5	0.75	neg.	FM	PAL

Sentence(s)

D is the first 625-line system.

final_sentence: D is the first 625-line system.