Frequency dividing apparatus

Claim 2

Apparatus for dividing the frequency of a first signal which is subject to discontinuities, comprising in combination: first means for receiving said first signal; second means connected to said first means for providing a second signal having a frequency which is divided relative to the frequency of said first signal, said second means tending to provide a phase jump in said second signal in response to a discontinuity in said first signal; third means operatively associated with said second means for sensing a provision of said phase jump, said third means including fourth means for providing a third signal varying within a predetermined period of time in response to a provision of said phase jump, fifth means for Providing a fourth signal remaining substantially stable within said predetermined period of time, and sixth means connected to said fourth and fifth means for sensing a provision of said phase jump by a comparison of said third signal with said fourth signal; and seventh means connected between said second and third means for correcting said phase jump in said second signal, in response to a sensing of said provision of said phase jump by said third means.

Claim 3

Apparatus as claimed in claim 1, wherein: said fifth means include a phase-lock loop having a time constant exceeding said predetermined period of time.

Claim 4

Apparatus as claimed in claim 1, wherein: said second means include means for adjusting the phase of said second signal in response to a control signal by an amount sufficient to correct said phase jump; and said fourth means include means for providing said control signal in response to said sensing by said third means, and for applying said control signal to said phase adjusting means.

Claim 5

Apparatus for correcting effects of angular errors in a color video signal including a color synchronization signal and being accompanied by a pilot signal which is subject to discontinuities, comprising in combination; first means for receiving said pilot signal; second means for receiving said color video signal including said color synchronization signal; third means connected to said first means for at least dividing the frequency of said pilot signal, said third means tending to provide a phase jump in said frequency-divided pilot signal in response to said discontinuities; fourth means for providing a substantially stable carrier signal; fifth means connected to said second, third and fourth means for redisposing modulation components of said color video signal including said color synchronization signal about said substantially stable carrier signal whereby to correct effects of angular errors in said color video signal, with said phase jump in said frequency-divided pilot signal causing a phase shift in said redisposed color synchronization signal; sixth means connected to said fifth means for sensing said phase shift in said redisposed color synchronization signal; and seventh means connected between said third and sixth means for correcting said phase jump in said frequency-divided pilot signal in response to a sensing of said phase shift in said redisposed color synchronization signal.

Claim 6

Apparatus for correcting effects of angular errors in a color video signal including a color synchronization signal and being accompanied by a pilot signal which is subject to discontinuities, comprising in combination; first means for receiving said pilot signal; second means for receiving said color video signal including said color synchronization signal; third means connected to said first means for at least dividing the frequency of said pilot signal, said third means tending to provide a phase jump in said frequency-divided pilot signal in response to said discontinuities; fourth means for providing a substantially stable carrier signal; fifth means connected to said second, third and fourth means for redisposing modulation components of said color video signal including said color synchronization signal about said substantially stable carrier signal whereby to correct effects of angular errors in said color video signal, with said phase jump in said frequency-divided pilot signal causing a phase shift in said redisposed color synchronization signal; sixth means connected to said fifth means for sensing said phase shift in said redisposed color synchronization signal; and seventh means connected between said third and sixth means for correcting said phase jump in said frequency-divided pilot signal in response to a sensing of said phase shift in said redisposed color synchronization signal.

Claim 7

Apparatus as claimed in claim 4, wherein said sixth means include: eighth means for providing a first signal varying within a predetermined period of time in response to said phase shift in said redisposed color synchronization signal; ninth means for providing a second signal remaining substantially stable within said predetermined period of time; and tenth means connected to said eight and ninth means for sensing said phase shift in said redisposed color synchronization signal by a comparison of said first and second signals.

Claim 8

Apparatus as claimed in claim 5, wherein: said ninth means include a phase-lock loop having a time constant exceeding said predetermined period of time.

Claim 9

Apparatus as claimed in claim 4, wherein: said third means include means for adjusting the phase of said frequency-divided pilot signal in response to a control signal by an amount sufficient to correct said phase jump; and said seventh means include means for providing said control signal in response to said sensing of said phase shift in said redisposed color synchronization signal, and for applying said control signal to said phase adjusting means.