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Considerations in the Operation of CATV Headends Carrying BTSC Stereo Signals

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Considerations in the Operation of CATV Headends Carrying BTSC Stereo Signals Considerations in The Operation of CATV Headends Carrying BTSC Stereo Signals BY Alex Best William Woodward Video Communications Division Scientific-Atlanta, Inc. Important parameters in the proper operation of a the DSB-SC subcarrier and to indicate the presence cable television headend carrying BTSC stereo audio of a stereo signal, is transmitted at a frequency signals are discussed, and the reason for their im­ equal to the horizontal scan frequency. Figure 1 portance is presented. The reason for not adjust­ shows a basic block diagram of the system and an ing aural carrier modulation Levels with a program illustration of the baseband spectrum of the en­ BTSC stereo signal is presented. Methods of ad­ coded signal. Note that an additional subcarrier justing a headend for BTSC stereo transmission are is shown. This is the Second Audio Program (SAP) presented, as well as some basic considerations in subcarrier which is used for bilingual broadcasts. generating a BTSC stereo signal. This subcarrier is FM modulated. The maximum devi­ ation of the main carrier by each component is in­ dicated in the figure. Because of the wider base­ band bandwidth (100KHz) and the higher peak devi­ ation (±73KHz) of the aural carrier, the stereo compatible CATV headend must have wider baseband and RF aural carrier bandwidths than those required INTRODUCTION for monaural operation. The use of the BTSC stereo transmission method in In order to achieve a good signal to noise ratio cable television systems has generated much contro­ in areas of poor signal quality, it was determined versy. The BTSC format, however, has been uni­ that some noise reduction method was required for versally accepted by television receiver manu­ the difference subcarrier and the SAP subcarrier. facturers as the stereo sound transmission standard The noise reduction system chosen was the DBX com­ to be used in the United States. If a cable system panding system, which consists of wideband com­ operator decides that he will carry signals in the pression and variable pre-emphasis in the encoding BTSC format, it is important that he understands process, and a complementary wide band expansion the requirements for operating such a system. In and variable de-emphasis in the receiver. addition to hardware changes, the manner in which the cable system is operated will have to be It is important to note that for good stereo sepa­ changed. This article addresses some of the more ration the gain in the sum signal path must be the important issues in operating a system which same as the gain of the difference signal path. carries a BTSC stereo signal. It will be assumed Note that ideally the DBX encoder at the modulator that the cable television system operator has (transmitter or headend) and the DBX decoder in the studied the technical issues involved in selecting television receiver are totally complementary and a stereo transmission method (i.e., set top con­ have no overall effect on the difference signal verter compatibility, scrambling, etc.) and has Level and frequency response. determined that the BTSC format is suitable for In order for the DBX decoder in the television his system. receiver to properly track the DBX encoder at the transmitter (or CATV headend), the deviation of BASIC BTSC THEORY the aural carrier must be accurately set to the In order to help understand the problems associated Levels specified for the BTSC System. If the pro­ with the BTSC signal, a cursory review of the per deviation Levels are not maintained, the stereo system is in order. The system is conceptually separation of the system will be reduced. If the similar to commercial broadcast FM stereo. As deviation is being set, there must be some refer­ with commercial FM stereo, the BTSC stereo signal ence signal from the BTSC encoder which corresponds consists of a baseband signal which is the sum of to a specific deviation. Since there is no refer­ the right and Left audio channels and a double ence signal when the input to the encoder is a pro­ sideband suppressed carrier (DSB-SC) subcarrier gram audio signal, there is no way to correctly ad­ which is modulated by a signal which is the differ­ just the aural modulator deviation when the modu­ ence between the Left and right audio channels. Lator input is program audio in the BTSC stereo The carrier frequency of the DSB-SC signal is format. twice the horizontal scan frequency of the video signal. A pilot carrier that is used to demodulate 130-1985 NCTA Technical Papers ·~~­ Output Left BTSC ENCODER/AURAL EXCITER Input Right Output Left BTSC RECEIVER 50 Deviat1on KHz l • R 25 50·)5 KHz 15- l + R 50· l 5 KHz BTSC BASEBAND SPECTRUJI'I FIGURE 1 SIGNAL PROCESSORS As television stations start to broadcast BTSC Howe~er, once these changes have been made, pro­ signals, CATV signal processors will be required cesslng a BTSC stereo signal requires no more to process the BTSC signal. Signal processors attention than processing a monaural signal. fall into one of the following categories~ heter­ If processing is performed with a demodulator/modu­ odyne processors, strip amplifiers, and demodula­ Lator combination, then the manner in which the tor/modulator combinations. Of these, strip ampli­ aural signal is connected between the two units is fiers and heterodyne processors are the simplest critical. If the BTSC stereo signal is demodulated to use with a stereo signal. As determined by the to a broadband baseband signal, it must be remodu­ NCTA_studies and subsequent studies, these types Lated in the modulator to the modulation Levels of of s1gnal processors typically have few deleterious the original signal. Any errors in this modulation effects on the stereo signal. Since the audio level will be detrimental to the stereo separation. signal is never demodulated, they require Little In an attempt to determine how critical the modu­ attention in operation. This is not to say that Lation Level is to system performance, a computer these types of processors will not require modi­ program was written to simulate the BTSC encoder fication or realignment to operate with BTSC the FM modulator, and the television receiver. ' stereo signals (although, many units will have The results from this program are shown in figure sufficient bandwidth and passband amplitude flat­ 2. As can be seen from the figure, in order to ness to operate satisfactoriLy with a BTSC signal). 1985 NCTA Technical Papers-131 '0 45 40 35 SEPARATION (dB} 30 (1KHz Tone) 15 10 15 I 0 -JO 10 JII'IODULATION ERROR CO Figure 2 maintain a stereo separation of at Least 30d8 in an frequency. Since the pilot carrier always deviates otherwise perfect system, it is necessary to main­ the main carrier 5KHz, it is conceivable that some tain the modulation Level to within ±5% of the modulation indicator, either a peak deviation in­ correct Level. dicator Light or meter, could then be used to For these reasons it is preferable to interconnect measure the deviation due to the pilot. To set the demodulator and the modulator audio path with the overall modulation to the correct Level, the a 4.5MHz Link. This eliminates the problems as­ pilot deviation would be set to 5KHz. Although sociated with adjusting the modulation Level since this idea has some merit (and it is the only the signal is never demodulated. It is important method which allows the modulation to be adjusted to note that Scientific-Atlanta and other manu­ with an active signal), the standards for the BTSC facturers' demodulators and modulators can be con­ stereo signal as they now exist allow for a~ error of ±500Hz in the pi Lot deviation. If the p1lot nected in this manner and provide satisfactory re­ sults with BTSC signals provided that the 4.5MHz were used to adjust the modulation Level there path has sufficient bandwidth. There is much could be as much as a 10% error in the modulation standard monaural equipment connected in this Level. As can be seen from figure 2, this would manner that when properly aligned, works well with give marginal stereo separation performance. a BTSC stereo signal. MODULATORS If for some reason it is essential to demodulate a BTSC signal to broadband baseband, it is recommend­ Undoubtedly, as the popularity of stereo television ed that the demodulator/modulator combination be grows, many cable system operators will desire to aligned in the following manner. Apply a FM carri­ produce a BTSC stereo signal for their pay channels. It will be assumed that Left and right er, w.h i ch is mouulateu by a tone, to the RF i np~t-of the demodulator. Using a Spectrum Analyzer, adJUSt audio signals' are available from a satellite the tone to the correct frequency and Level to pro­ earth station or other suitable source. Figure duce a Bessel carrier null Ci.e., a 10KHz tone 3 illustrates how such a system might be con­ modulating the carrier to ±25KHz deviation). Set figured. As can be seen, some form of BTSC encoder the demodulator audio output to a convenient Level will be required. It will be necessary to decide or to the Level recommended by the manufacturer. whether the audio modulator portion of the video The modulator aural modulation Level should then be modulator will be replaced with a stereo-compatible adjusted until the same carrier null is present in unit or if the encoder will be purchased with an the spectrum of the RF output of the modulator. audio modulator. If the encoder is purchased with This process will require that the demodulator/ an audio modulator, then adjusting the system modulator be taken out of service while the adjust­ should be relatively simple because the modulation ment is being made.
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