JPS6019715B2 - Information signal reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information signal reproducing device that transports a track scanner on which desired information content is recorded using an electrical signal obtained by photoelectrically converting a predetermined image displayed on a reproduction screen. An object of the present invention is to provide an information signal reproducing device that can easily perform random access operations by obtaining the signals necessary to perform random access operations.

There is a known device for reproducing an information recording carrier (hereinafter also referred to as a video disk) on which an information signal such as a video signal is recorded in a spiral or D-circular track formed by countless intermittent bits. However, it is well known that this type of device can perform random access operations to selectively extract desired information from a video disc (for example, "SMPTE Jom Misaki 1, Vol. 86").
:P. 80-82, Feb. 1977. ”)
.

For example, if the first track of a video disc records a table of contents for each information content of other information tracks, a still image of this track may be viewed to provide a general idea of the desired information content (for example, a symphony by composer B performed by symphony orchestra A). If record jacket C has the desired information content, the number of the item representing symphony (if symphony, jazz, chamber music, etc.) is displayed in the still image is manually input using the keyboard switch. Then, in order to reproduce the information content corresponding to this time, the scanner is rapidly moved to that track and reproduces a still image from that track. This still image represents the superordinate concept of the desired information content (for example, in the above example, this still image lists the names of the composers of the symphony, and B is the superordinate concept). manually enter again using the keyboard switch. Thereafter, desired information can be reproduced by sequentially repeating this operation. However, the conventional random access operation is still good when the number of digits to be entered is small compared to the keyboard, but when the number of digits is large (for example, 5 digits), the keyboard input operation is complicated and easy to make mistakes. Ta.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIGS. 1A and 1B are diagrams showing examples of images reproduced and displayed by the reproduction apparatus of the present invention, respectively, and FIGS. 2A and 2B are diagrams showing the stimulation signal and the first coding signal in FIGS. 1A and B. An enlarged view of the reproduced image, a waveform diagram of these two signals, and a block system diagram of an embodiment of the information signal reproducing apparatus according to the present invention are shown in FIG. Figure 1A is an example display image when the information content is about music, Figure 1B is an example display image when the information content is about a map of Japan, and in Figures A and B, 1 is an information recording mirror. A reproduced image of the trigger signal and the first coding signal is shown, which is recorded on the carrier in advance in the video period portion of the video signal together with the video signal. An enlarged view of image 1 indicated by a circle in FIG. 2A is shown in FIG. 2A. In Figure 2A, 3
4 indicates a reproduced image of the above-mentioned stimulus signal, and 4 indicates a reproduced image of the first coding signal. FIG. 2B shows electrical signal waveforms for displaying images 3 and 4 shown in FIG. 2A. A random access operation can be performed by reproducing an information recording carrier on which such a prompting signal, a first coding signal, or a second coding signal (to be described later) is recorded with the information signal reproducing Hishitaka of the present invention. can be done easily. That is, to explain the random access operation with reference to FIGS. 3 and 4A to 4E, first, a light bend (3rd
(indicated by 8 in the figure) is brought into contact with the screen.

This light vent has the function of converting the brightness and darkness of light into electrical signals, and is composed of photodiodes, phototransistors, etc. In FIG. 3, at the same time as the light ben 8 touches the central portion of the image 3, a switch (not shown) applies a set signal to the set terminal of the pulse generator 6, making its output logic "1". This pulse generator 6
The output pulse of logic "1" becomes as shown by e in FIG. is applied to the monostable multipipulator 9 via the gate circuit 7 as a signal shown as b in FIG. This is reset at the falling green edge, causing the output of the pulse generator 6 to be logic "0" and turning off the gate circuit 7. The monostable multipipulator 9 maintains logic "1" for a certain period of time 7 due to the above trigger.
A pulse c as shown in FIG. 4C is output and applied to the gate circuit 1 as a gate pulse.

The gate circuit 10 determines that the period of the input time 7 of this pulse c is "
It is in an open state, and the reproduced video signal input from the input terminal 12 is gate-outputted. Here, the predetermined time 7 is selected to a value such that the reproduced signal of the first coding signal is gate-outputted. Therefore, gate circuit 1 is shown in Figure 4D.
As shown in FIG. 4, from a part of the trigger signal that displays the image 3 in which the light ben 8 is being touched in the reproduced signal and the first coding signal (indicated by 13 in FIG. 4D) related to this trigger signal. A gate outputs a signal d,
The signal is applied to the code signal demodulation circuit 11. The code signal demodulation circuit 11 decodes the input reproduced coding signal 13 and applies it to a memory (not shown).

The output of this memory controls the rotation of the scanning element feed motor,
Scanner (light beam emitting device and light receiving device, or scanning needle) up to the track specified by the coding signal 13
to be transferred. As a result, a desired screen is automatically obtained. Therefore, by simply touching the light ben 8 to the center of the reproduced image 3 of the trigger signal,
A reproduction screen of the desired information content is automatically obtained. In addition,
If the code signal shown in FIG. 2B cannot specify the entire code signal, the second coding signal shown in FIG. As shown in 2, it may be recorded together with the video signal so as to be inserted into the lower part of the screen. The reproduced image 2 based on the second coding signal is as shown in FIG. 1A and FIG. 5A, respectively. As a result, when the first coding signal 13 shown in FIG. 4D matches the portion shown by 14 in the second coding signal shown in FIG. 5B,
The signal reproduced after the portion indicated by 14 in FIG. 5B can be a code signal for selecting a screen. Figure 1B
When the trigger signal is displayed in each part of the screen as shown in the figure, it is better to keep the display part of the first coding signal following the trigger signal short.
The above method will work. Although we have explained the case where the code signal is displayed on the screen, it is not necessarily limited to this, and while a carrier different from the video signal to be reproduced is modulated and recorded with the code signal, only the trigger signal The recorded information recording carrier may be reproduced to be displayed together with the video signal.

Furthermore, the apparatus of the present invention may be a magnetic reproducing apparatus (however, the information recording carrier in this case is of course a magnetic recording medium). As described above, the information signal reproducing device according to the present invention records the coding signal specifying the track to be scanned by the scanner in the video signal or in a different band from the video signal, and uses the information signal reproducing device to read the coding signal. an information signal in which a trigger signal is superimposed on a video period portion of the video signal and causes the scanner to scan relative to an information recording carrier recorded prior to the coding signal to reproduce a previously recorded signal; The playback device includes a photoelectric conversion element that selects a desired trigger signal display position in a playback screen on which at least the trigger signal and the video signal are simultaneously reproduced and displayed, and converts the display position image into an electrical signal. , gate pulse generating means for generating a gate pulse of a constant width from the time of input of the output electric signal of the photoelectric conversion element; and gate outputting the reproduced video signal of the information recording carrier using the gate pulse, a gate circuit that extracts the coding signal related to the trigger signal from the reproduced video signal; a demodulation circuit that demodulates the output coding signal of the gate circuit and outputs track position information specified by the coding signal; Since the scanning element is moved to the designated track position by the output signal of the circuit, a reproduced image with desired information content can be obtained by a simple operation of bringing the photoelectric conversion element into contact with the reproduction screen. Therefore, the random access operation can be easily and reliably performed with an inexpensive configuration, and the second coding signal recorded in the video signal or in a band different from this can be linked to the coding signal. Since the scanner is forcibly moved to a predetermined track based on the second coding signal information as well as the coding signal, code signals that could not be specified using the coding signal alone can also be specified. Therefore, it has the advantage of further simplifying the random access operation.

[Brief explanation of drawings]

FIGS. 1A and 8 are diagrams showing examples of images reproduced and displayed by the reproduction apparatus of the present invention, respectively, and FIGS.
, B, and their electrical signal waveform diagrams; FIG. 3 is a block system diagram of an embodiment of the device of the present invention; FIG. 4A and FIGS. 5A and 5B are an enlarged image diagram of the main part of FIG. 1A and its electrical signal waveform diagram, respectively. 1... Reproduction image of the trigger signal and the first coding signal, 3... Reproduction image of the trigger signal, 4...
... Reproduction image of the first coding signal, 6...
... Pulse generator, 7, 10 ... Gate circuit, 8 ... Light Ben, 9 ... Monostable multipipulator, 12 ... Reproduction signal input terminal. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A coding signal specifying a track to be scanned by a scanner is recorded in a video signal or in a band different from this, and a triggering signal used to read the coding signal is recorded in the video signal of the video signal. An information signal reproducing device for reproducing a previously recorded signal by scanning the scanner relative to an information recording carrier that is superimposed on a period part and recorded in advance of the coding signal, the information signal reproducing device A photoelectric conversion element that selects a desired display position of the applied signal in a playback screen in which the applied signal and the video signal are simultaneously reproduced and displayed and converts the display position image into an electrical signal, and an output of the photoelectric conversion element. gate pulse generating means for generating a gate pulse of a constant width from the time of input of the electric signal; and gate outputting the reproduced video signal of the information recording carrier using the gate pulse to generate a signal related to the selected desired tightening signal. a gate circuit that extracts the coding signal from the reproduced video signal; a demodulation circuit that demodulates the output coding signal of the gate circuit and outputs track position information specified by the coding signal; An information signal reproducing apparatus characterized by comprising means for transporting said scanning element to said designated track position using an output signal.