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Federal Communications Commission § 73.682

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Federal Communications Commission § 73.682 Federal Communications Commission § 73.682 Multichannel Television Sound (MTS). Any multaneous visual and aural signals intended system of aural transmission that utilizes to be received by the general public. aural baseband operation between 15 kHz and Television channel. A band of frequencies 6 120 kHz to convey information or that en- MHz wide in the television broadcast band codes digital information in the video por- and designated either by number or by the tion of the television signal that is intended extreme lower and upper frequencies. to be decoded as audio information. Television transmission standards. The stand- Multiplex Transmission (Aural). A sub- ards which determine the characteristics of a channel added to the regular aural carrier of television signal as radiated by a television a television broadcast station by means of broadcast station. frequency modulated subcarriers. Television transmitter. The radio trans- Negative transmission. Where a decrease in mitter or transmitters for the transmission initial light intensity causes an increase in of both visual and aural signals. the transmitted power. Vestigial sideband transmission. A system of Peak power. The power over a radio fre- transmission wherein one of the generated quency cycle corresponding in amplitude to sidebands is partially attenuated at the synchronizing peaks. transmitter and radiated only in part. Percentage modulation. As applied to fre- Visual carrier frequency. The frequency of quency modulation, the ratio of the actual the carrier which is modulated by the pic- frequency deviation to the frequency devi- ture information. ation defined as 100% modulation expressed Visual transmitter. The radio equipment for in percentage. For the aural transmitter of the transmission of the visual signal only. Visual transmitter power. The peak power TV broadcast stations, a frequency deviation output when transmitting a standard tele- of ±25 kHz is defined as 100% modulation. vision signal. Pilot subcarrier. A subcarrier used in the re- ception of TV stereophonic aural or other [28 FR 13660, Dec. 14, 1963, as amended at 35 subchannel broadcasts. FR 5692, Apr. 8, 1970; 36 FR 5505, Mar. 24, 1971; Polarization. The direction of the electric 36 FR 17429, Aug. 31, 1971; 41 FR 56325, Dec. 28, field as radiated from the transmitting an- 1976; 42 FR 20823, Apr. 22, 1977; 44 FR 36039, tenna. June 20, 1979; 47 FR 35990, Aug. 18, 1982; 49 FR Program related data signal. A signal, con- 18106, Apr. 27, 1984; 49 FR 38131, Sept. 27, 1984; sisting of a series of pulses representing 49 FR 50048, Dec. 26, 1984; 50 FR 23699, June 5, data, which is transmitted simultaneously 1985; 51 FR 12616, Apr. 14, 1986; 56 FR 49707, with and directly related to the accom- Oct. 1, 1991; 58 FR 44951, Aug. 25, 1993; 62 FR panying television program. 51059, Sept. 30, 1997] Reference black level. The level cor- responding to the specified maximum excur- § 73.682 TV transmission standards. sion of the luminance signal in the black di- (a) Transmission standards. (1) The rection. width of the television broadcast chan- Reference white level of the luminance signal. nel shall be 6 MHz. The level corresponding to the specified (2) The visual carrier frequency shall maximum excursion of the luminance signal in the white direction. be nominally 1.25 MHz above the lower Scanning. The process of analyzing succes- boundary of the channel. sively, according to a predetermined method, (3) The aural center frequency shall the light values of picture elements consti- be 4.5 MHz higher than the visual car- tuting the total picture area. rier frequency. Scanning line. A single continuous narrow (4) The visual transmission ampli- strip of the picture area containing high- tude characteristic shall be in accord- lights, shadows, and half-tones, determined ance with the chart designated as Fig- by the process of scanning. ure 5 of § 73.699: Provided, however, That Standard television signal. A signal which conforms to the television transmission for stations operating on Channel 15 standards. through 69 and employing a trans- Synchronization. The maintenance of one mitter with maximum peak visual operation in step with another. power output of 1 kW or less the visual Television broadcast band. The frequencies transmission amplitude characteristic in the band extending from 54 to 806 mega- may be in accordance with the chart hertz which are assignable to television designated as Figure 5a of § 73.699. broadcast stations. These frequencies are 54 (5) The chrominance subcarrier fre- to 72 megahertz (channels 2 through 4), 76 to quency is 63/88 times precisely 5 MHz 88 megahertz (channels 5 and 6), 174 to 216 ± megahertz (channels 7 through 13), and 470 to (3.57954545 . MHz). The tolerance is 806 megahertz (channels 14 through 69). 10 Hz and the rate of frequency drift Television broadcast station. A station in the must not exceed 0.1 Hz per second (cy- television broadcast band transmitting si- cles per second squared). 217 VerDate 11<MAY>2000 12:48 Dec 06, 2001 Jkt 194191 PO 00000 Frm 00217 Fmt 8010 Sfmt 8010 Y:\SGML\194191T.XXX pfrm09 PsN: 194191T § 73.682 47 CFR Ch. I (10–1–01 Edition) (6) For monochrome and color trans- (13) The reference white level of the missions the number of scanning lines luminance signal shall be 12.5±2.5 per- per frame shall be 525, interlaced two cent of the peak carrier level. to one in successive fields. The hori- (14) It shall be standard to employ zontal scanning frequency shall be 2/455 horizontal polarization. However, cir- times the chrominance subcarrier fre- cular or elliptical polarization may be quency; this corresponds nominally to employed if desired, in which case 15,750 Hz with an actual value of clockwise (right hand) rotation, as de- 15,734.264 ±0.044 Hz). The vertical scan- fined in the IEEE Standard Definition ning frequency is 2/525 times the hori- 42A65–3E2, and transmission of the hor- zontal scanning frequency; this cor- izontal and vertical components in responds nominally to 60 Hz (the actual time and space quadrature shall be value is 59.94 Hz). For monochrome used. For either omnidirectional or di- transmissions only, the nominal values rectional antennas the licensed effec- of line and field frequencies may be tive radiated power of the vertically used. polarized component may not exceed (7) The aspect ratio of the trans- the licensed effective radiated power of mitted television picture shall be 4 the horizontally polarized component. units horizontally to 3 units vertically. For directional antennas, the max- (8) During active scanning intervals, imum effective radiated power of the the scene shall be scanned from left to vertically polarized component shall right horizontally and from top to bot- not exceed the maximum effective ra- tom vertically, at uniform velocities. diated power of the horizontally polar- (9) A carrier shall be modulated with- ized component in any specified hori- in a single television channel for both zontal or vertical direction. picture and synchronizing signals. The (15) The effective radiated power of two signals comprise different modula- the aural transmitter must not exceed tion ranges in amplitude in accordance 22% of the peak radiated power of the with the following: visual transmitter. (i) Monochrome transmissions shall comply with synchronizing waveform (16) The peak-to-peak variation of specifications in Figure 7 of § 73.699. transmitter output within one frame of (ii) Color transmissions shall comply video signal due to all causes, includ- with the synchronizing waveform spec- ing hum, noise, and low-frequency re- ifications in Figure 6 of § 73.699. sponse, measured at both scanning syn- (iii) All stations operating on Chan- chronizing peak and blanking level, nels 2 through 14 and those stations op- shall not exceed 5 percent of the aver- erating on Channels 15 through 69 li- age scanning synchronizing peak signal censed for a peak visual transmitter amplitude. This provision is subject to output power greater than one kW change but is considered the best prac- shall comply with the picture trans- tice under the present state of the art. mission amplitude characteristics It will not be enforced pending a fur- shown in Figure 5 of § 73.699. ther determination thereof. (iv) Stations operating on Channels (17) The reference black level shall be 15 through 69 licensed for a peak visual separated from the blanking level by transmitter output power of one kW or the setup interval, which shall be less shall comply with the picture 7.5±2.5 percent of the video range from transmission amplitude characteristic blanking level to the reference white shown in Figure 5 or 5a of § 73.699. level. (10) A decrease in initial light inten- (18) For monochrome transmission, sity shall cause an increase in radiated the transmitter output shall vary in power (negative transmission). substantially inverse logarithmic rela- (11) The reference black level shall be tion to the brightness of the subject. represented by a definite carrier level, No tolerances are set at this time. This independent of light and shade in the provision is subject to change but is picture. considered the best practice under the (12) The blanking level shall be trans- present state of the art. It will not be mitted at 75±2.5 percent of the peak enforced pending a further determina- carrier level. tion thereof. 218 VerDate 11<MAY>2000 12:48 Dec 06, 2001 Jkt 194191 PO 00000 Frm 00218 Fmt 8010 Sfmt 8010 Y:\SGML\194191T.XXX pfrm09 PsN: 194191T Federal Communications Commission § 73.682 (19) The color picture signal shall difference signals EQ′ and EI′ are as fol- correspond to a luminance component lows: transmitted as amplitude modulation Q–channel bandwidth: of the picture carrier and a simulta- At 400 kHz less than 2 dB down.
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