Method and apparatus for stop-motion playback of a record disc

Claim 2

Apparatus for playing a record disc having recorded thereon a special composite signal that includes a digitized and time-compressed audio signal recorded on a first track and a video signal representative of a video frame recorded on a second track, wherein the apparatus operates to produce a stop-motion display of the video frame represented by the recorded video signal, while accompanied by playback of an analog audio signal corresponding to the recorded time-compressed audio signal, said apparatus comprising: means for scanning the first track of the record disc to recover the time-compressed audio signal recorded thereon, said time-compressed audio signal having a relatively high bit rate; memory means for storing the digital data included in the recovered time-compressed audio signal; said means for scanning being further operable, after recovering the time-compressed audio signal, to scan repeatedly the second track of the record disc and recover the video signal recorded thereon; means for displaying, in a repeated fashion, the video frame represented by the recovered video signal; means, operable simultaneously with said means for displaying, for extracting the digital data from said memory means to produce an intermediate digital signal corresponding to the time-compressed audio signal, said intermediate signal having a relatively low bit rate; and means for converting the intermediate digital signal to the corresponding analog audio signal for playback simultaneous with the repeated display of the video frame.

Claim 3

Apparatus as defined in claim 1, wherein: the digital data included in the time-compressed audio signal recorded on the first track on the record disc is interleaved with periodic video synchronization signals; and said apparatus further includes means for separating the digital data from the synchronization signals of the time-compressed audio signal recovered from the disc, to produce a succession of packets of digital data for storing in said memory means.

Claim 4

Apparatus as defined in claim 2, wherein: the video synchronization signals include periodic chrominance burst signals having a prescribed frequency; the bit rate of the time-compressed audio signal recovered from the disc is synchronized with the prescribed frequency of the chrominance burst signals; and said means for separating includes means for detecting the periodic chrominance burst signals and for generating a clock signal having a frequency synchronized therewith, and means, responsive to the clock signal, for detecting the successive bits of the succession of digital data packets.

Claim 5

Apparatus as defined in claim 1, wherein said means for converting comprises delta demodulation means.

Claim 6

Apparatus as defined in claim 1, wherein: the recorded video signal includes a flag code signal indicating the number of times the second track is to be scanned by said means for scanning; said means for scanning includes means for detecting the flag code signal included in the video signal; and said means for scanning scans the second track the number of times indicated by the detected flag code signal.

Claim 7

Apparatus for playing a record disc having recorded thereon a special composite signal that includes a digitized and time-compressed audio signal recorded on a first track and a video signal representative of a video frame recorded on a second track, wherein the apparatus operates to produce a stop-motion display of the video frame represented by the recorded video signal, while accompanied by playback of an analog audio signal corresponding to the recorded time-compressed audio signal, said apparatus comprising: means for scanning the first track of the record disc to recover the time-compressed audio signal recorded thereon, said time-compressed audio signal having a relatively high bit rate; wherein the digital data included in the time-compressed audio signal recorded on the first track on the record disc is interleaved with conventional periodic video synchronization signals that include periodic chrominance burst signals having a prescribed frequency, and wherein the bit rate of the time-compressed audio signal is synchronized with the prescribed frequency of the chrominance burst signals; means for separating the digital data from the synchronization signals of the time-compressed audio signal recovered from the disc, to produce a succession of packets of digital data; memory means for storing the successive packets of digital data derived from the recovered time-compressed audio signal; said means for scanning being further operable, after recovering the time-compressed audio signal, to scan repeatedly the second track of the record disc and recover the video signal recorded thereon; means for displaying, in a repeated fashion, the video frame represented by the recovered video signal; means, operable simultaneously with said means for displaying, for extracting the digital data from said memory means to produce an intermediate digital signal corresponding to the time-compressed audio signal, said intermediate signal having a relatively low bit rate; and delta demodulation means for converting the intermediate digital signal to the corresponding analog audio signal, for playback simultaneous with the repeated display of the video frame.

Claim 8

Apparatus for playing a record disc having recorded thereon a special composite signal that includes a digitized and time-compressed audio signal recorded on a first track and a video signal representative of a video frame recorded on a second track, wherein the apparatus operates to produce a stop-motion display of the video frame represented by the recorded video signal, while accompanied by playback of an analog audio signal corresponding to the recorded time-compressed audio signal, said apparatus comprising: means for scanning the first track of the record disc to recover the time-compressed audio signal recorded thereon, said time-compressed audio signal having a relatively high bit rate; wherein the digital data included in the time-compressed audio signal recorded on the first track on the record disc is interleaved with conventional periodic video synchronization signals that include periodic chrominance burst signals having a prescribed frequency, and wherein the bit rate of the time-compressed audio signal is synchronized with the prescribed frequency of the chrominance burst signals; means for separating the digital data from the synchronization signals of the time-compressed audio signal recovered from the disc, to produce a succession of packets of digital data; memory means for storing the successive packets of digital data derived from the recovered time-compressed audio signal; said means for scanning being further operable, after recovering the time-compressed audio signal, to scan repeatedly the second track of the record disc and recover the video signal recorded thereon; means for displaying, in a repeated fashion, the video frame represented by the recovered video signal; means, operable simultaneously with said means for displaying, for extracting the digital data from said memory means to produce an intermediate digital signal corresponding to the time-compressed audio signal, said intermediate signal having a relatively low bit rate; and delta demodulation means for converting the intermediate digital signal to the corresponding analog audio signal, for playback simultaneous with the repeated display of the video frame.

Claim 11

A method as defined in claim 7, wherein: the digital data included in the time-compressed audio signal recorded, on the first track on the record disc is interleaved with periodic video synchronization signals; and said method further includes a step of separating the digital data from the synchronization signals of the time-compressed audio signal recovered from the disc, to produce a succession of packets of digital data for storing in the memory device.

Claim 12

A method as defined in claim 8, wherein: the video synchronization signals include periodic chrominance burst signals having a prescribed frequency; the bit rate of the time-compressed audio signal recovered from the disc is synchronized with the prescribed frequency of the chrominance burst signals; and said step of separating includes steps of detecting the periodic chrominance burst signals and generating a clock signal having a frequency synchronized therewith, and using the clock signal to detect the successive bits of the succession of digital data packets.

Claim 13

A method as defined in claim 7, wherein said step of converting includes a step of delta demodulating the intermediate digital signal.

Claim 14

A method as defined in claim 7 wherein: the recorded video signal includes a flag code signal indicating the number of times the second track is to be scanned in said step of repeatedly scanning; said step of repeatedly scanning includes a step of detecting the flag code signal included in the video signal; and said step of repeatedly scanning scans the second track the number of times indicated by the detected flag code signal.