Method and apparatus for sampling and processing a video signal

Claim 1

A method for sampling and processing a video signal containing synchronizing information on a time base, comprising the steps of: separating the synchronizing information from the video signal; producing sampling clock pulses in the form of an oscillating output signal of an oscillator by controlling the oscillation of the oscillating output signal of the oscillator in accordance with the separated synchronizing information; sampling the video signal on the time base with the produced sampling clock pulses; generating a reference signal having a predetermined frequency; detecting at least part of a vertical blanking period of the video signal; and phase comparing a first signal which is one of the oscillating output signal and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal and the reference signal divided by a predetermined amount and providing a phase error output signal indicative of the phase difference.

Claim 2

A method for sampling and processing a video signal containing synchronizing information on a time base, comprising the steps of: separating the synchronizing information from the video signal; producing sampling clock pulses in the form of an oscillating output signal of an oscillator by controlling the oscillation of the oscillating output signal of the oscillator in accordance with the separated synchronizing information; sampling the video signal on the time base with the produced sampling clock pulses; generating a reference signal having a predetermined frequency; detecting at least part of a vertical blanking period of the video signal; and phase comparing a first signal which is one of the oscillating output signal and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal and the reference signal divided by a predetermined amount and providing a phase error output signal indicative of the phase difference.

Claim 6

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; and sampling means for sampling the video signal on the time base with the produced sampling clock pulses; wherein the oscillator means includes an oscillator having an enable input for initiating the oscillation output signal of the oscillator in response to the output of the separating means, and clock counter means responsive to the oscillation output signal of the oscillator and the output of the separating means for producing sampling clock pulses as an output thereof.

Claim 7

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; and sampling means for sampling the video signal on the time base with the produced sampling clock pulses; wherein the oscillator means includes an oscillator having an enable input for initiating the oscillation output signal of the oscillator in response to the output of the separating means, and clock counter means responsive to the oscillation output signal of the oscillator and the output of the separating means for producing sampling clock pulses as an output thereof.

Claim 8

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; sampling means for sampling the video signal on the time base with the produced sampling clock pulses; reference signal generating means for generating a reference signal having a predetermined frequency; detector means for detecting at least a part of a vertical blanking period of the video signal and providing an output signal indicative thereof; and phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means and the output signal of the detector means.

Claim 9

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; sampling means for sampling the video signal on the time base with the produced sampling clock pulses; reference signal generating means for generating a reference signal having a predetermined frequency; detector means for detecting at least a part of a vertical blanking period of the video signal and providing an output signal indicative thereof; and phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means and the output signal of the detector means.

Claim 12

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; and sampling means for sampling the video signal on the time base with the produced sampling clock pulses; the sampling means including A/D converter means for converting the video signal to a digitized video signal and providing an output indicative thereof, memory means for storing the output of the A/D converter means and for reading out a stored output, digital adder means for adding an output from the A/D converter means and the memory means and providing an output therefrom, and D/A converter means for converting the output of the digital adder means to an analog signal, the A/D converter means, the memory means and the D/A converter means being responsive to the produced sampling clock pulses for controlling the operation thereof.

Claim 13

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; and sampling means for sampling the video signal on the time base with the produced sampling clock pulses; the sampling means including A/D converter means for converting the video signal to a digitized video signal and providing an output indicative thereof, memory means for storing the output of the A/D converter means and for reading out a stored output, digital adder means for adding an output from the A/D converter means and the memory means and providing an output therefrom, and D/A converter means for converting the output of the digital adder means to an analog signal, the A/D converter means, the memory means and the D/A converter means being responsive to the produced sampling clock pulses for controlling the operation thereof.

Claim 15

An apparatus for correcting a time base fluctuation of a video signal containing synchronizing information on a time base, the apparatus comprising: A/D converter means for converting the video signal to a digitized video signal and providing an output indicative thereof; memory means for storing the output of the A/D converter means and for reading out a stored output therefrom; write address controller means for controlling writing in the memory means; read address controller means for controlling reading of the memory means; D/A converter means for converting the stored output read from the memory means to an analog signal; separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillating output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; reference signal generating means for generating a reference signal having a predetermined frequency; detector means for detecting at least a part of a vertical blanking period of the video signal and providing an output signal indicative thereof; phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means and the output signal of the detector means, the A/D converter means and the write address controller means being responsive to the sampling clock pulses for controlling the operation thereof, and the read address controller means and the D/A converter means being responsive to the second signal for controlling the operation thereof.

Claim 16

An apparatus for correcting a time base fluctuation of a video signal containing synchronizing information on a time base, the apparatus comprising: A/D converter means for converting the video signal to a digitized video signal and providing an output indicative thereof; memory means for storing the output of the A/D converter means and for reading out a stored output therefrom; write address controller means for controlling writing in the memory means; read address controller means for controlling reading of the memory means; D/A converter means for converting the stored output read from the memory means to an analog signal; separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillating output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; reference signal generating means for generating a reference signal having a predetermined frequency; detector means for detecting at least a part of a vertical blanking period of the video signal and providing an output signal indicative thereof; phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means and the output signal of the detector means, the A/D converter means and the write address controller means being responsive to the sampling clock pulses for controlling the operation thereof, and the read address controller means and the D/A converter means being responsive to the second signal for controlling the operation thereof.

Claim 22

A method for sampling and processing a video signal containing synchronizing information on a time base, comprising the steps of: separating the synchronizing information from the video signal; producing sampling clock pulses in the form of an oscillating output signal of an oscillator by controlling the oscillation of the oscillating output signal of the oscillator in accordance with the separated synchronizing information; sampling the video signal on the time base with the produced sampling clock pulses, generating a reference signal having a predetermined frequency; phase comparing a first signal which is one of the oscillating output signal and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal and the reference signal divided by a predetermined amount and providing a phase error output signal indicative of the phase difference therebetween; and controlling an oscillating frequency of the oscillator in response to the phase error output signal during a predetermined period.

Claim 23

A method for sampling and processing a video signal containing synchronizing information on a time base, comprising the steps of: separating the synchronizing information from the video signal; producing sampling clock pulses in the form of an oscillating output signal of an oscillator by controlling the oscillation of the oscillating output signal of the oscillator in accordance with the separated synchronizing information; sampling the video signal on the time base with the produced sampling clock pulses, generating a reference signal having a predetermined frequency; phase comparing a first signal which is one of the oscillating output signal and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal and the reference signal divided by a predetermined amount and providing a phase error output signal indicative of the phase difference therebetween; and controlling an oscillating frequency of the oscillator in response to the phase error output signal during a predetermined period.

Claim 24

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillating means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; sampling means for sampling the video signal on the time base with the produced sampling clock pulses, reference signal generating means for generating a reference signal having a predetermined frequency; phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means during a predetermined period.

Claim 25

An apparatus for sampling and processing a video signal containing synchronizing information on a time base, comprising: separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillation output signal of the oscillating means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; sampling means for sampling the video signal on the time base with the produced sampling clock pulses, reference signal generating means for generating a reference signal having a predetermined frequency; phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means during a predetermined period.

Claim 28

An apparatus for correcting a time base fluctuation of a video signal containing synchronizing information on a time base, the apparatus comprising: A/D converter means for converting the video signal to a digitized video signal and providing an output indicative thereof; memory means for storing the output of the A/D converter means and for reading out a stored output therefrom; write address controller means for controlling writing in the memory means; read address controller means for controlling reading of the memory means; D/A converter means for converting the stored output read from the memory means to an analog signal; separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillating output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; reference signal generating means for generating a reference signal having a predetermined frequency; phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means during a predetermined period, the A/D converter means and the write address controller means being responsive to the sampling clock pulses for controlling the operation thereof, and the read address control means and the D/A converter means being responsive to the signal for controlling the operation thereof.

Claim 29

An apparatus for correcting a time base fluctuation of a video signal containing synchronizing information on a time base, the apparatus comprising: A/D converter means for converting the video signal to a digitized video signal and providing an output indicative thereof; memory means for storing the output of the A/D converter means and for reading out a stored output therefrom; write address controller means for controlling writing in the memory means; read address controller means for controlling reading of the memory means; D/A converter means for converting the stored output read from the memory means to an analog signal; separating means for separating the synchronizing information from the video signal and providing an output indicative thereof; oscillator means responsive to the output signal of the separating means for producing sampling clock pulses in the form of an oscillating output signal thereof, the oscillating output signal of the oscillator means being controlled in accordance with the output of the separating means so that the oscillating output signal is instantaneously phase-synchronized with the output of the separating means; reference signal generating means for generating a reference signal having a predetermined frequency; phase comparison means for comparing a first signal which is one of the oscillating output signal of the oscillator means and the oscillating output signal divided by a predetermined amount with a second signal which is one of the reference signal of the reference signal generating means and the reference signal divided by a predetermined amount and providing a phase error signal indicative of the phase difference therebetween; and controlling means for controlling an oscillating frequency of the oscillator means in response to the phase error signal of the phase comparison means during a predetermined period, the A/D converter means and the write address controller means being responsive to the sampling clock pulses for controlling the operation thereof, and the read address control means and the D/A converter means being responsive to the signal for controlling the operation thereof.