a simpler but less comprehensive solution is shown in fig4 where a single audio synchronizer as an ad 3100 audio synchronizer is added at the output of the audio mixer the amount of delay added to the audio path is chosen as a compromise for the various sources contributing to the program output in any given effect as shown in fig4 v ideo inputs are input to a video switcher with internal dve 39 s 411 this provides gpi and tally signals output as input to an interface 421 which produces the audio delay steering pulses the video switcher 411 also produces program video out with video through dve paths delayed when a dve is on the air the output of the interface 421 is input to an audio delay 431 where along with audio inputs 441 through an audio mixer 443 the delay steering pulse correction is applied to yield a corrected audio output 453 for example in a typical newscast over the shoulder shot the studio anchor has zero video delay and the remote reporter in the box has one frame of video delay setting the audio synchronizer for example an ad 3100 audio synchronizer delay to between 0 and 0 5 frame is the best compromise for both sources the studio anchor 39 s audio will be slightly late and the remote reporter 39 s audio slightly early the residual lip sync errors are reduced compared to doing nothing at all since the video delay of the dve may be switched in and out of the program path several times in a relatively short period it is essential that the audio delay u201c catch up u201d quickly conventional.