JPH0135358Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a high-speed search device for a rotating recording medium, and particularly for a disk-shaped rotating recording medium (hereinafter referred to as a "disk").
The present invention relates to a high-speed search device that operates to search for a desired track position in a short time and to accurately display address information immediately after the search.

PRIOR TECHNOLOGY In general, in a disc playback device, when performing a high-speed search to search for an arbitrary track position (information signal recording position) on the recorded tracks of a disc in a short time, an address value corresponding to a preset desired track position and a disc playback device are searched at high speed. The values of the address signals obtained during reproduction are compared with each other, and the pick-up reproduction element starts reproduction in a desired mode from the point where the two match. The above address signals include, for example, a chapter address signal that mainly indicates the order of recording programs, a time address signal that indicates the total time from the recording program start position, and a track address signal that indicates the order of recording tracks. The address signal is chronologically inserted into a specific period within the vertical blanking period of the recorded video signal and transmitted.

The disc playback device also has a display device that displays the playback position of the pick-up playback element on the disc based on the playback value of one type of address signal arbitrarily selected from the three types of address signals. During the above-mentioned high-speed search, this display device displays the target address value of one type of address signal arbitrarily selected from the three types of address signals mentioned above, from immediately before the high-speed search until the high-speed search ends, and displays the target address value of one type of address signal arbitrarily selected from the above three types of address signals. , the reproduced image is muted and not displayed on the screen.

Problems to be Solved by the Invention However, in the above-mentioned high-speed search device in the conventional disc playback device, the tracking servo circuit is inactive during high-speed search, and the pick-up playback element moves in the radial direction of the disc faster than during normal playback. Since it is transferred at a much faster speed, the rate at which one type of arbitrarily selected address signal can be reproduced is much lower than during normal reproduction.
For this reason, during the high-speed search period, only one type of arbitrarily selected address signal is selectively reproduced, and at the same time as the target address data is detected, reproduction in the desired mode is started, and at the same time, the same time as the reproduction immediately before the start of the search operation is performed. It was configured to reproduce the same type of address signal and resume displaying the address data. Therefore, if, for example, during normal playback, you select an address signal of a different type from the address data displayed during normal playback and perform a search operation, the address data will be displayed immediately after the search operation ends. was causing a problem.

In other words, the conventional high-speed search device can be used, for example, when pressing the chapter search button to search for the first track position of a video information program with a desired chapter number while importing time address data and displaying the time during normal playback. During the search period, only the playback chapter address data is taken in, and normal playback starts when the pick-up playback element is moved to the first track position of the video information program of the desired chapter number, and the screen At the same time that the display of the playback image starts, the display switches to the time display that shows the playback position, but
At this point, the playback time address data after the search has not yet been taken in, so there is a problem in that the time address data immediately before the start of the search operation is displayed.

Therefore, the present invention has developed a rotating recording medium that solves the above problems by sequentially switching and capturing multiple types of address signal data when the target address data is reproduced, and then displaying the address data. The purpose is to provide a high-speed search device.

Means for Solving the Problems The present invention provides a plurality of types of reproduction signals from the pick-up reproduction element, which start being transferred at the reproduction speed of the desired mode from the time when the reproduction address signal data and the target address value respectively match. address data importing means for sequentially taking in the address signals of the address signals at a constant cycle; means for restarting the display on the display device of the data of the reproduced address signal which is the same type as the address signal taken in by the search operation and which was displayed immediately before the start of the search operation. An example will be described with reference to the drawings.

Embodiment FIG. 1 is a schematic diagram showing an example of a track pattern of a disc to be reproduced by the apparatus of the present invention. Disc 1 has a spiral track T, and the main information signal consisting of a video signal and an audio signal is a frequency modulated wave. It is recorded as a signal with pits formed according to the information content. Among one continuous spiral track T shown by a solid line in FIG. 1, the tracks corresponding to each rotation of the disk 1 are shown as t ₁ , t ₂ , t ₃ , . . . . Each track has a pit for the main information signal formed on a flat surface, and no needle guide groove is formed. For one track, pits for the first reference signal fp ₁ and pits for the second reference signal fp ₂ are formed on both sides in the longitudinal direction at positions corresponding to the horizontal blanking period every 1 horizontal scanning period 1H. ing.

Only one of the pits of the reference signals fp ₁ and fp ₂ is formed at an intermediate position between the center lines of adjacent tracks, and moreover, only one of the pits of the reference signals fp ₁ and fp ₂ is formed for one track. The side on which is recorded changes for each track. In other words, in Fig. 1, the reference signal
The track of fp ₁ is shown by a broken line, and the track of reference signal fp ₂ is shown by a dashed line. v ₁ , v ₂ , v ₃ , ... indicate the position of the vertical synchronization signal of each field. Further, at the starting end position of each track t ₁ , t ₂ , t ₃ , ..., that is, at the position v ₁ , v ₅ , v ₉ , ... where the reference signals fp ₁ and fp ₂ switch, a third reference signal fp ₃ is provided. is recorded for a 3H period, for example.

Further, the disk 1 has one rotation period equal to, for example, four field periods of the video signal, and a vertical blanking period of tracks t ₁ , t ₂ , t ₃ within the ranges a, b, c, and d in FIG. , . . . Three types of address signals, which will be described later, are also recorded within this vertical blanking period.

In addition, white square marks are shown in the four vertical blanking period recording portions a to d of each of the four vertical blanking period recording portions of each track t ₁ , t ₂ , t ₃ , . . . on the disk 1. As shown, the chapter address signal Ac, the time address signal _AT , and the track address signal are each recorded in time series.

Figure 2A schematically shows the structure of a total of 29-bit chapter address signal Ac, which mainly indicates the order of recording programs on the same recording surface of a disk.
It consists of a line identification code 3 of bits, a voice identification code 4 of 2 bits, a chapter number identification code 5 of 8 bits, a time identification code 6 of 12 bits, and a parity bit 7 of 1 bit. When the recorded video signal is in the NTSC format, this chapter address signal Ac is used for each horizontal scanning period of horizontal scanning line numbers 17 and 280 (that is, after the equalization pulse after the vertical synchronization pulse for both odd and even fields). , and are transmitted in a superimposed manner during one horizontal scanning period (from the time when the eighth horizontal synchronizing signal is received).

Synchronization code 2 is a binary number "1100" that indicates the value of "C" in hexadecimal notation, line identification code 3 is a code that identifies the transmission line of the chapter address signal Ac, and audio identification code 4 is a code that identifies the transmission line of the chapter address signal Ac. This is a code indicating the type of audio signal (for example, stereo, monaural, bilingual, etc.). Further, the chapter number identification code 5 is a code indicating the order of the recording program, and can indicate chapter numbers up to 99, for example. Also, the time identification code 6 is a code that indicates the track position from the initial position of each head of the recording program of each chapter number indicated by the chapter number identification code 5 in seconds, and is called a local address, and is a code that indicates the track position from the initial position of each chapter number indicated by the chapter number identification code 5. It can be expressed up to (=2 ¹² -1) seconds.

On the other hand, FIG. 2B schematically shows the structure of a total 29-bit time address signal A _T that mainly indicates the track position in terms of time from the initial position of the first recorded program in the program recording section of the disk.
4-bit synchronization code 8, 2-bit line identification code 9, 2-bit audio identification code 10, 16-bit time identification code 11, 4-bit track identification code 12, and 1-bit parity bit 1.
It consists of 3. This time address signal A _T is
It is transmitted in one horizontal scanning period (horizontal scanning line number 18, 281) following the transmission period of the chapter address signal Ac. Line identification code 9 indicates this transmission period, and synchronization code 8 and voice identification code 10 have the same contents as synchronization code 2 and voice identification code 4, respectively. Also time identification code 11
indicates the time during normal playback from the first recording position of all recorded programs, from 0 minutes 0 seconds to a maximum of 59 minutes.
Can be shown for up to 59 seconds. The track identification code 12 is a code for identifying the number of the track played in one second. For example, in a disk that is supposed to play back a video signal with a field frequency of 60Hz along with an audio signal, the disk rotates 15 times per second, so this means how many tracks out of 15 tracks are played in the same second. This is because it is necessary to identify whether the

Furthermore, although not shown in the figure, the track address signal is composed of a total of 29 bits, similar to the chapter address signal Ac and the time address signal _AT , and the synchronization code, line identification code, audio identification code, and parity bit are the same as those described above. address signal
It is the same bit as Ac and _AT , and is arranged in the same position, and has a total of 20 bits from the 9th bit to the 28th bit _.
Indicates the order of t ₂ , t ₃ ,... These 20 bits are divided into 5 sections of 4 bits each, and each section is configured to represent a value in the digits of "10,000,""1,000,""100,""10," and "-" in hexadecimal notation. ing. The track address signal with such a configuration is based on the recorded video signal being NTSC.
In the case of this method, the signal is transmitted superimposed on each horizontal scanning period of horizontal scanning line numbers 20 and 283. All 29 bits of these three types of address signals Ac, _AT and track address signals are transmitted within 1H period, but as mentioned above, their recording positions are at different 1H periods within the vertical blanking period. It is recorded during the period, and its recording position is indicated by line identification codes 3 and 9 in Ac and _AT .

Disk 1 with the above track pattern
For example, the diameter is 26 cm and the diameter of the center hole 14 is 38.2 cm.
900rpm clockwise.
The recorded signal is reproduced as a change in capacitance by a disk reproducing apparatus configured as shown in FIG. In FIG. 3, the disk 1 is lowered and placed on a turntable 17 while its central portion is supported by a support body consisting of a lifter 15 and an elevator 16. Before the start of playback of the disc 1 or after the end of playback, the pick-up housing 18 is in a standby position (rest position) 18a, and this state occurs when the actuator of the rest switch 19, which is fixed at a predetermined position, is pushed by a part of the carriage 22. It is detected when the signal is turned on. The pick-up housing 18 includes a pick-up device including a cantilever 20 and a regeneration needle 21 attached to its tip, a resonator (not shown), etc., and is attached to a carriage 22.

The carriage 22 has rollers 23a, 2 on both sides thereof.
3b and 23c are provided. Roller 23a
rolls on the rail 24a, and the rollers 23b and 2
By rolling on the rails 24b, the carriages 22 move in the X direction or the Y direction, respectively. A wire 26 is connected between the pulleys 25a and 25b.
is strung up. The wire 26 is connected to the carriage 22
The pulley 25a is configured such that the rotational force of the feed motor 27 is transmitted via a speed reduction mechanism 28. As a result, when the feed motor 27 rotates, the pulley 25a rotates, and the wire 26 is transferred in the direction of the arrow X or Y depending on the direction of rotation, and the carriage 22 is thereby also transferred in the direction of the arrow X or Y.

Further, a disc 29 is attached coaxially with the gear constituting the speed reduction mechanism 28, and this disc 29 has notches formed at equal angular intervals. A photo sensor 30 consisting of a light-emitting element and a light-receiving element is provided on the upper and lower surfaces of the disc 29 at a slight distance from each other. Since the light is intermittently interrupted, a pulse train having a period corresponding to the rotational speed of the disk 29 can be obtained from the light receiving element of the photo sensor 30. That is, a pulse train with a period corresponding to the rotational speed of the feed motor 27 is transmitted to the photo sensor 3.
Obtained from 0.

Furthermore, in FIG. 3, the lifter 15 is U-shaped, and the ring-shaped bottom surface of the elevator 16 is placed on the top surface of the lifter 15. The inner diameter of the ring-shaped elevator 16 is slightly larger than the outer diameter of a center spindle 33 attached to the tip of a rotating shaft 32 of a motor that rotates the turntable 17. The outer peripheral tapered surface of the center spindle 33 has a diameter that fits into the inner diameter of the center hole 14 of the disk 1. The upper end of the elevator 16 is moved up and down by the lifter 15.
It can be raised and lowered from a position above the turntable 17 (standby position) to a position substantially equal to the rotation surface of the turntable 17 (playback position). In addition,
When the playback needle 21 reaches the point where the lead-out portion of the disc 1 is played back, the lead-out detection switch 31
is turned on.

The device of the present invention is a high-speed search device that can be applied to the disc playback device shown in FIG. 3, and one embodiment thereof is shown in FIG. 4. In the figure, the same components as those in FIG. 3 are designated by the same reference numerals, and their explanations will be omitted. In this embodiment, for convenience of explanation, the chapter address signal is
Although the configuration is such that one of two types of address signals, AC and time address signal A _T , can be arbitrarily selected, one of the three types of address signals including the track address signal. You can also perform a high-speed search by selecting . In FIG. 4, the search controller 35 is supplied with an address signal selection signal from an input terminal 36 for selecting and specifying one of a time address signal and a chapter address signal, and is also supplied from an input terminal 37 with an address signal selection signal for selecting and specifying one of a time address signal and a chapter address signal. A mode signal indicating the input signal is supplied, and a target address value is also supplied from the input terminal 38, and the required operation is performed based on these input signals.

First, we will explain the operation when a reproduction mode signal other than the search mode is input to the input terminal 37. In this case, the search controller 35 causes the feed motor control circuit 47 to transfer the reproduction needle 21 at a speed corresponding to the reproduction mode. At the same time, the selection signal generating circuit 39 is controlled so that a selection signal for selecting the time address signal _AT and the chapter address signal Ac is alternately generated for each field.

The selection signal taken out from the selection signal generation circuit 39 is supplied to the address signal selection circuit 41. The recorded signal on the disk 1 is picked up and reproduced by a reproduction needle 21, then FM demodulated by an FM demodulator (not shown), and further supplied to an address signal selection circuit 41 via an input terminal 40. The address signal selection circuit 41 alternately selects and outputs the chapter address signal Ac and time address signal A _T superimposed within the vertical blanking period of the input reproduced video signal for each field in accordance with the selection signal. ,
It is supplied to the shift register 43 in the address data capture circuit 42 at the next stage. Selection signal generation circuit 39
The configuration of the circuit including the address signal selection circuit 41 is such that, for example, counting is performed based on the vertical synchronization signal of the reproduced video signal, and the count value corresponds to one predetermined horizontal scanning period in which the address signal Ac or _AT is inserted. The input playback video signal is gate-outputted when the input reproduction video signal reaches a value indicating A total of 6 bits are generated to match the value of the address signal to be selectively reproduced, and these 6 bits are combined with the corresponding 6 bits of the address signal in the reproduced video signal.
The configuration is such that the bit values are compared, and when the two match, the seventh bit and subsequent bits of the reproduced address signal are output.

The shift register 43 sequentially transfers the reproduced address signals serially transmitted from the address signal selection circuit 41 to the right in response to the shift clock from the control circuit 44, and controls the signal when, for example, 25 bits excluding synchronization code 2 or 8 are received. Generation of the shift clock is stopped by the circuit 44. When the 25-bit address data has been stored in the shift register 43, a latch pulse is output from the control circuit 44 to the latch circuit 45, so that the 25-bit address data from the parallel output terminal of the shift register 43 is stored in the latch circuit 45. is latched to. The address data taken out from the latch circuit 45 undergoes a parity check, etc., and then a total of 20 bits of address data from the 9th bit to the 28th bit are taken out and sent to the common terminal 46c of the switch circuit 46. Supplied.

Here, the switch circuit 46 is configured to be switched controlled by a selection signal from the selection signal generation circuit 39, and is controlled by a selection signal from the chapter address signal Ac.
During selective reproduction, 20 bits of address data are selectively outputted from the terminal 46a to the memory 48 and the search controller 35, respectively, and 20 bits of address data are selected from the terminal 46b to the memory 49 and the search controller 35, respectively, when the time address signal _AT is selectively reproduced. Output. The search controller 35 does not accept reproduction address data from the switch circuit 46 during reproduction modes other than the search mode.
On the other hand, the memories 48 and 49 respectively update and store new address data each time the chapter address data and time address data are received.
The storage address data is supplied to terminals 50a and 50b of the switch circuit 50. switch circuit 50
is controlled by switching in accordance with a display mode signal from a terminal 51, and when displaying chapter address data, outputs input reproduced chapter address data from a terminal 50a to a display device 52 via a common terminal 50c, When displaying address data, input playback time address data from the terminal 50b is sent to the display device 52 via the common terminal 50c.
Selectively output to. As a result, in playback modes other than search mode such as normal playback mode, chapter address data and time address data are taken in alternately for each field and stored alternately in memories 48 and 49, but they are not used. Only one type of reproduction address data arbitrarily selected by the user is supplied to the display device 52 and displayed there. From the address value displayed on the display device 52, the current playback track position of the playback needle 21 can be known.

Next, to explain the search operation, for example, when the pick-up casing 18 is located at the position shown at 18b in FIG. 1
A target address value indicating the desired search position above is supplied from the input terminal 38 to the display device 52 via the search controller 35, and an address signal selection signal corresponding to the type of address signal of the target address value is supplied to the input terminal 36. Then, when a search mode signal is input to the input terminal 37, a search operation is started. As an example, if a target address for a chapter number is set, the display device 52 displays the target address, and at the same time, the search controller 35 generates a chapter address signal selection signal from the selection signal generation circuit 39. At the same time, a motor control signal is supplied to the feed motor 27 via the feed motor control circuit 47, and the motor control signal is rotated in the direction of rotation in which the playback needle 21 is moved in the direction of the target address value and at a speed much faster than during normal playback. Rotate at speed. The search controller 35 also disables a tracking servo circuit (not shown) that performs tracking servo of the reproduction needle 21 using the envelope detection outputs of the reference signals _fp1 to _fp3 . As a result, the regenerated needle 21
begins to be moved toward the target address at high speed while sliding on the disk 1.

On the other hand, the address signal selection circuit 41 selects and outputs only the reproduced chapter address signal Ac transmitted during each 1H period of scanning line numbers 17 and 280 from among the reproduced video signals of the reproduction needle 21 that have started to be transferred at high speed.
It is supplied to the address data acquisition circuit 42. The reproduction chapter address data taken out from the address data acquisition circuit 42 is supplied to the memory 48 through a switch circuit 46 which is controlled to selectively output an input signal to a terminal 46a.
It is supplied to the search controller 35. The search controller 35 compares the reproduced chapter address data with the target chapter address from the input terminal 38, and continues the above operation until the two match. The search controller 35 controls the rotation direction of the feed motor 27 according to the polarity of the difference value between the reproduced chapter address data and the target chapter address, and controls the feed motor 27 when the absolute value of the difference is less than a predetermined value. A signal is generated and supplied to the feed motor control circuit 47 to control the rotation speed to be increased when the rotation speed is greater than the predetermined value, and to be rotated at a slower speed when the rotation speed is smaller than the predetermined value.

When the above operation is repeated and the playback needle 21 reaches the target chapter address, the search controller 3
5 detects whether the reproduced chapter address data and the target chapter address match each other. As a result, the search controller 35 generates a signal to rotate the feed motor 27 at the same rotation direction and rotation speed as the desired playback mode such as normal playback, and supplies the signal to the feed motor control circuit 47.
A selection signal generating circuit 39 generates a selection signal for alternately selecting a chapter address signal and a time address signal for each field. As a result, the address signal selection circuit 41 selects the chapter address signal Ac in the video signal reproduced in the desired mode.
and time address signal _AT are alternately selected and output for each field and supplied to the address data acquisition circuit 42, and the switch circuit 46 is connected to the terminal 4.
Switching control is performed to alternately selectively output the input playback address data of 6c to the terminal 46a or 46b for each field. Therefore, the memory 48
stores the playback chapter address immediately after starting playback in the desired mode from the target chapter address,
Also, the memory 49 stores the reproduction time address one field before or one field after.

After that, the search controller 35 switches the display on the display device 52 from displaying the target chapter address to displaying the playback address data, and at the same time changes the display of the playback video signal that has been carried out from the start of the search, although not shown. Muting of the screen display is canceled and the display of the reproduced image on the screen is resumed. Here, since the switch circuit 50 is maintained in the connected state immediately before the start of the search operation, the reproduced address data displayed on the display device 52 immediately after the end of the search operation was displayed on the display device 52 immediately before the start of the search operation. This is the same type of address data as the playback address data. Therefore, for example, if the display device 52 is displaying time address data immediately before the start of the search operation and a search operation is performed based on the chapter address data, the display device 52 will display the playback time address immediately after the chapter search operation is finished. The data will be displayed, but as described above, in this embodiment, the display is performed after the playback time address data of the track position immediately after the end of the chapter search operation is stored in the memory 49. needle 2
The latest time address data corresponding to the playback position of 1 can be displayed.

Incidentally, the present invention can also be applied to a reproducing apparatus for reproducing recorded signals from a disc that does not have a track pattern as shown in FIG.

Effects As described above, according to the present invention, when the target address data is reproduced, the data of multiple types of address signals are sequentially switched and captured, and then the reproduced address data is displayed. If a search operation is performed by selecting an address signal of a different type from one type of reproduced address signal data displayed on the display device immediately before the start of the operation, the data displayed on the display device immediately after the end of the search operation is This data can be the same type of address signal data as that immediately before the start of the search operation, and can also be the data of the reproduced address signal obtained by reproduction in the desired mode immediately after the end of the search operation, so that the search operation can be ended as in the conventional device. This method has features such as being able to prevent the problem of displaying the playback address data immediately before the end of the search operation, and eliminating flickering on the display.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a schematic track pattern of a disc to be reproduced by the apparatus of the present invention, FIGS. 2A and B are diagrams showing an example of signal formats of a chapter address signal and a time address signal, respectively. The figure is a plan view showing a schematic example of the mechanism of a disc playback device to which the device of the present invention can be applied, and FIG. 4 is a block system diagram showing one embodiment of the device of the present invention. 1...Disc-shaped rotating recording medium (disk), 2,
8...Synchronization code, 3,9...Line identification code, 5...Chapter number identification code, 11...Time identification code, 17...Turntable, 18...
...Pick-up housing, 21...Regeneration needle, 22...
Carriage, 25a, 25b...Pulley, 26...
... wire, 27 ... feed motor, 35 ... search controller, 36 ... address signal selection signal input terminal, 37 ... mode signal input terminal, 38
...Target address input terminal, 39...Selection signal generation circuit, 40...Reproduction signal input terminal, 41...Address signal selection circuit, 42...Address data acquisition circuit, 46, 50...Switch circuit, 47...
...Feed motor control circuit, 51...Display mode signal input terminal, 52...Display device, Ac...Chapter address signal, A _T ...Time address signal,
a to d... Vertical blanking period recording portion.

Claims (1)

[Scope of utility model registration request] A target address value indicating a desired search position on a rotating recording medium in which multiple types of address signals indicating the recording position of the information signal are combined and recorded in time series is arbitrarily selected from among the multiple types. Only the address signal of the same type as the target address value is captured from the reproduction signal of the rotary recording medium reproduced by the pick-up reproduction element, which is instructed by the address signal and transferred at high speed by the transfer mechanism. Reproduction in the desired mode is started from the time when the data of the reproduction address signal matches the target address value, and during the search period, the reproduction address of the same type as immediately before the start of the search operation is displayed on the display device displaying the target address value. In a high-speed search device that restarts the display of signal data,
From the time when the data of the reproduction address signal and the target address value respectively match, the plurality of types of address signals are transmitted at a constant cycle from the reproduction signal of the pickup reproduction element, which starts to be transferred at the speed of reproduction in the desired mode. address data importing means for sequentially importing address data; and at least from the time when each of the plurality of types of reproduced address signal data is taken in by the address data importing means one by one, A high-speed search device for a rotating recording medium, comprising means for restarting the display device to resume displaying data of a reproduced address signal of the same type as the address signal displayed immediately before the start of a search operation.