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sound in syncs wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 history toggle history subsection 1 1 awards 2 versions toggle versions subsection 2 1 original mono sound in syncs 2 2 ruggedised sound in syncs 2 3 stereo sound in syncs 2 4 itv sound in syncs 3 notes and references 4 see also 5 further reading toggle the table of contents sound in syncs add languages add links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia redirected from sound in syncs method of adding sound to broadcast video sound in syncs is a method of multiplexing sound and video signals into an analogue television channel designed to carry video in which data representing the sound is inserted into the line synchronising pulse of the video waveform this was used on point to point links within broadcasting networks including studio transmitter links it was not used for broadcasts to the public history edit the technique was first developed by the bbc in the late 1960s in 1966 the corporation s research department made a feasibility study of the use of pulse code modulation pcm for transmitting television sound during the synchronising period of the video signal this had several advantages it removed the necessity for a separate sound link reduced the possibility of operational errors and offered improved sound quality and reliability 1 awards edit sound in syncs and its r d engineers have won several awards including the royal television society s geoffrey parr award in 1972 2 a queen s award for enterprise in 1974 3 in 1999 a technology engineering emmy award 4 versions edit original mono sound in syncs edit in the original system as applied to 625 line analogue tv the audio signal was sampled twice during each television line and each sample converted to 10 bit pcm two such samples were inserted into the next line synchronising pulse at the destination the audio samples were converted back to analogue form and the video waveform restored to normal compandors operating on the signal before encoding and after decoding enabled the required signal to noise ratio to be achieved as the pcm noise was predominantly high pitched the compandor only needed to operate on the high frequencies also the compandor only operated at high audio levels so that modulation of the noise by the companding would be masked by the relatively loud high frequency audio components a pilot tone at half the sampling frequency was transmitted to enable the expander to track the gain adjustment applied by the compressor even when the latter was limiting 1 following successful trials with the bbc in 1971 pye tvt started to make and sell the sound in syncs equipment under licence the largest quantities went to the bbc itself to the ebu and to canada smaller numbers went to other countries including south africa australia and japan 5 ruggedised sound in syncs edit a ruggedised version of the system was developed which provided about 7 khz audio bandwidth for use over noisy or difficult microwave paths such as those often encountered for outside broadcasts 6 stereo sound in syncs edit later systems developed in the 1980s used 14 bit linear pcm samples digitally companded into 10 bit samples by means of nicam 3 lossy compression these were capable of carrying two audio channels and were known as stereo sound in syncs 7 itv sound in syncs edit the itv network used coders and encoders produced by re of denmark the two variations of sound in syncs used by the bbc and itv were not compatible the terms dcsis or dsis was commonly used in itv to describe dual channel sound in syncs very often material carried was not stereo but dual mono 8 notes and references edit 1 2 pawley e 1972 bbc engineering 1922 1972 pp 506 7 522 bbc isbn 0 563 12127 0 bbc research rts awards bbc research queen s awards link removed bbc research emmy award for sound in syncs link removed holder j e spenceley n m and clementson c s 1984 a two channel sound in syncs transmission system ibc 1984 iee conference publication no 240 p 345 dalton c j 1971 a p c m sound in syncs system for outside broadcasts bbc engineering no 86 april 1971 pp 18 28 examining the sort of bbc s sound in sync nicam 728 broadcast solution iba engineering announcements graham sawdy on nicam 20 march 1990 youtube 5 march 2014 see also edit vimcas further reading edit waveform specification of the bbc sound in syncs equipment ebu review 121a june 1970 chorley j m and shorter d e l 1970 p c m sound in syncs operational systems for video distribution and contribution networks iee conference publication no 69 1970 international broadcasting convention dalton c j 1968 the distribution of television sound signals by pcm signals incorporated in the vision waveform iee international broadcasting convention september 1968 vol 46 part 1 sanders j r 1967 pulse sound a system of television sound broadcasting using pulses in the video waveform bbc engineering monograph no 67 may 1967 sanders j r 1968 pulse code modulation for high quality sound signal distribution incorporation of the sound signal in the video signal bbc research department report pdf shorter d e l chew j r howarth d and sanders j r 1968 pulse code modulation for high quality sound signal distribution bbc engineering monograph no 75 december 1968 shorter d e l 1969 the distribution of television sound by pulse code modulation signals incorporated in the video waveform ebu review no 113a february 1969 retrieved from https en wikipedia org w index php title sound in syncs oldid 1366249634 categories bbc research development broadcast engineering sound television technology video formats hidden categories articles with short description short description matches wikidata use dmy dates from april 2022 deprecated archive template links this page was last edited on 27 july 2026 at 01 09 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of 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