Sampling frequency reproduction system

Claim 2

A sampling frequency reproduction system comprising phase comparator means (106) supplied with a reference signal and an output of frequency-dividing means (601) for producing the phase difference between the two input signals as a phase error signal, band-limiting means (107) for limiting the phase error signal to a predeter­mined frequency band and producing a control signal, voltage-controlled oscillation means (108) for controlling the oscillation frequency of a clock produced by the control signal, and frequency-dividing means (601) for dividing the frequency of the clock by a predetermined number and producing the clock, wherein the frequency-­dividing means is supplied with a discrimination signal for determining the number of frequency divisions in accordance with the value of the discrimination signal.

Claim 3

A sampling frequency reproduction system comprising delay means (301) for delaying a reference signal, changing the amount of delay by a predetermined value in accordance with a discrimination signal and producing a first phase comparison point, phase comparator means (106) supplied with the first phase comparison point and an output of frequency dividing means (601) for producing the phase difference between the two inputs as a phase error signal, band-limiting means (107) for limiting the phase error signal to a predetermined band and producing a control signal, voltage-controlled oscillation means (108) for controlling the oscillation frequency of the clock produced by the control signal, and frequency-­dividing means (601) for dividing the frequency of the clock by a predetermined number, wherein the frequency-­dividing means is supplied with a discrimination signal and determines the number of frequency divisions in accordance with the value of the discrimination signal.

Claim 4

A sampling frequency reproduction system comprising delay means (301) for delaying a reference signal, changing the amount of delay by a predetermined value in accordance with a discrimination signal and producing a first phase comparison point, phase comparator means (106) supplied with the first phase comparison point and an output of frequency dividing means (601) for producing the phase difference between the two inputs as a phase error signal, band-limiting means (107) for limiting the phase error signal to a predetermined band and producing a control signal, voltage-controlled oscillation means (108) for controlling the oscillation frequency of the clock produced by the control signal, and frequency-­dividing means (601) for dividing the frequency of the clock by a predetermined number, wherein the frequency-­dividing means is supplied with a discrimination signal and determines the number of frequency divisions in accordance with the value of the discrimination signal.

Claim 5

A sampling frequency reproduction system used for a video cassette recorder according to Claim 1, wherein the reference signal is a head-switching pulse signal and the discrimination signal is a signal representing the number of the digital audio signal contained in the reproduction signal of each track.

Claim 6

A sampling frequency reproduction system used for a video cassette recorder according to Claim 2, wherein the reference signal is a head-switching pulse signal and the discrimination signal is a signal representing the number of the digital audio signal contained in the reproduction signal of each track.

Claim 7

In a method of transmitting a digital audio signal of a sampling frequency Fs in the number of [Fs/Fv] + An and [Fs/NFV] - Bn (n: 0 to k; n, k, An, Bn: Predetermined integer; [ ] indicates an integer) for each 1/N (N: predetermined integer or fraction) of the vertical sync period of the video signal of vertical sync frequency Fv and controlling the digital audio signal to Fs in average transmission rate, said digital audio signal being transmitted together with a discrimination signal for discriminating the number of the digital audio signal transmitted for each 1/N of the vertical sync period, a sampling frequency system comprising memory means (101) supplied with the digital audio signal transmitted by the transmission method for reading the same signal at a timing of a clock of voltage-controlled oscillation means (108) described later, detection means for detecting the vertical sync period of a video signal and producing a clock 1/N the vertical sync period as a detection signal, phase comparator means (106) for producing the phase difference between the detection signal and an output of a flip-flop (110) described later as a phase error signal, band-limiting means (107) for limiting the phase error signal to a predetermined frequency band, voltage-­controlled oscillation means (108) for controlling the oscillation frequency by an output of the band-limiting means, a counter (105) for counting the clock produced from the voltage-controlled oscillation means and cleared to produce a count value when a coincidence detection output is produced from a comparator (104) described later, a selector (102) for selecting and producing a value corresponding to the number of the digital audio signal transmitted for each 1/N of the vertical sync period of a discrimination signal applied thereto, latch means (103) for latching the value produced from the selector upon application thereto of a coincidence detection signal from the comparator, a comparator (104) supplied with a count output of the counter and a latch output of the latch means and producing a coincidence detection signal when the two inputs coincide with each other, and a flip-flop (110) with the output thereof reversed each time of application thereto of the coincidence detection signal from the comparator.

Claim 8

In a method of transmitting a digital audio signal of a sampling frequency Fs in the number of [Fs/Fv] + An and [Fs/NFV] - Bn (n: 0 to k; n, k, An, Bn: Predetermined integer; [ ] indicates an integer) for each 1/N (N: predetermined integer or fraction) of the vertical sync period of the video signal of vertical sync frequency Fv and controlling the digital audio signal to Fs in average transmission rate, said digital audio signal being transmitted together with a discrimination signal for discriminating the number of the digital audio signal transmitted for each 1/N of the vertical sync period, a sampling frequency system comprising memory means (101) supplied with the digital audio signal transmitted by the transmission method for reading the same signal at a timing of a clock of voltage-controlled oscillation means (108) described later, detection means for detecting the vertical sync period of a video signal and producing a clock 1/N the vertical sync period as a detection signal, phase comparator means (106) for producing the phase difference between the detection signal and an output of a flip-flop (110) described later as a phase error signal, band-limiting means (107) for limiting the phase error signal to a predetermined frequency band, voltage-­controlled oscillation means (108) for controlling the oscillation frequency by an output of the band-limiting means, a counter (105) for counting the clock produced from the voltage-controlled oscillation means and cleared to produce a count value when a coincidence detection output is produced from a comparator (104) described later, a selector (102) for selecting and producing a value corresponding to the number of the digital audio signal transmitted for each 1/N of the vertical sync period of a discrimination signal applied thereto, latch means (103) for latching the value produced from the selector upon application thereto of a coincidence detection signal from the comparator, a comparator (104) supplied with a count output of the counter and a latch output of the latch means and producing a coincidence detection signal when the two inputs coincide with each other, and a flip-flop (110) with the output thereof reversed each time of application thereto of the coincidence detection signal from the comparator.

Claim 9

In a method of transmitting a digital audio signal of a sampling frequency Fs in the number of [Fs/Fv] + An and [Fs/NFV] - Bn (n: 0 to k; n, k, An, Bn: Predetermined integer; [ ] indicates an integer) for each 1/N (N: Predetermined integer or fraction) of the vertical sync period of a video signal of vertical sync frequency Fv and controlling the digital audio signal to Fs in average transmission rate, said digital audio signal being transmitted together with a discrimination signal for discriminating the number of the digital audio signal transmitted for each 1/N of the vertical sync period, a sampling frequency reproduction system comprising memory means (101) supplied with a digital audio signal trans­mitted by the transmission method and reading the same signal at a timing of the clock of voltage-controlled oscillation means (108) described later, detection means for detecting the vertical sync period of a video signal and producing a clock of 1/N the vertical sync period as a detection signal, delay means (301) for delaying the detection signal, changing the delay amount by a predetermined value in accordance with the discrimi­nation signal and producing a first comparison point, frequency-dividing means (601) for dividing the frequency of the clock of the voltage-controlled oscillation means (108) described later and switching the number of frequency divisions to a predetermined value in accordance with the discrimination signal thereby to producing a second phase comparison point, phase comparator means (106) for producing a phase error signal in the form of the time difference between the first and second phase comparison points converted into a voltage, band-limiting means (107) for limiting the phase error signal to a predetermined frequency band and producing a control signal, and the voltage-controlled oscillation means (108) for controlling the oscillation frequency of the clock produced by the control signal to a predetermined value.

Claim 10

In a method of transmitting a digital audio signal of a sampling frequency Fs in the number of [Fs/Fv] + An and [Fs/NFV] - Bn (n: 0 to k; n, k, An, Bn: Predetermined integer; [ ] indicates an integer) for each 1/N (N: Predetermined integer or fraction) of the vertical sync period of a video signal of vertical sync frequency Fv and controlling the digital audio signal to Fs in average transmission rate, said digital audio signal being transmitted together with a discrimination signal for discriminating the number of the digital audio signal transmitted for each 1/N of the vertical sync period, a sampling frequency reproduction system comprising memory means (101) supplied with a digital audio signal trans­mitted by the transmission method and reading the same signal at a timing of the clock of voltage-controlled oscillation means (108) described later, detection means for detecting the vertical sync period of a video signal and producing a clock of 1/N the vertical sync period as a detection signal, delay means (301) for delaying the detection signal, changing the delay amount by a predetermined value in accordance with the discrimi­nation signal and producing a first comparison point, frequency-dividing means (601) for dividing the frequency of the clock of the voltage-controlled oscillation means (108) described later and switching the number of frequency divisions to a predetermined value in accordance with the discrimination signal thereby to producing a second phase comparison point, phase comparator means (106) for producing a phase error signal in the form of the time difference between the first and second phase comparison points converted into a voltage, band-limiting means (107) for limiting the phase error signal to a predetermined frequency band and producing a control signal, and the voltage-controlled oscillation means (108) for controlling the oscillation frequency of the clock produced by the control signal to a predetermined value.