KR900008854Y1 - Program automatic searching circuit for vtr - Google Patents

Abstract

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Description

Program automatic search circuit of video recorder

1 is a block diagram according to the present invention.

2a, b or 1 are specific circuit diagrams of one embodiment of the block diagram of FIG.

3 is a program setting diagram for the entire tape length.

4 is a partial operational waveform diagram of FIG.

* Explanation of symbols for main parts of the drawings

10: operation mode signal input and output unit 20: search program setting unit

30: display unit 40: search program signal output unit

50: frequency division generator 60: counting comparison unit

70: selective output unit 80: reproduction signal counting output unit

90: inverse add comparator

The present invention relates to a program automatic search circuit of a video recording player, and in particular, a search program signal is arbitrarily set and recorded on an audio track of a video recording tape to automatically search and play a program according to a user's request. It relates to a circuit.

In general, a video recording player has a picture search mode in which the user can perform picture search in a play state in order to watch a place where the user wants to watch. However, in order to perform the above and after picture search mode functions using a conventional video recording player, by pressing the picture search mode key and searching for a desired program (viewing and reducing screen), the user can perform picture search in a period of time. It was very uncomfortable.

For example, if the recording mode recorded on the video recording tape is in the super long play mode, the user may press the rewind key and the fast forward key in the above state to search for a desired program. There was a problem that you have to hold down the rewind and fast forward keys for a long time when you execute the program. Also, by manually selecting the desired program in the above manner, the starting point of the desired program cannot be exactly found at one time. The key was often repeated several times.

Therefore, an object of the present invention is to set the index signal of different search programs on the audio track of the video recording tape in the recording or playback mode by setting the search program setting keys, and to record the desired program at the time of picture search. The present invention provides a circuit for automatically searching and automatically performing a play back mode.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram according to the present invention, which has a Picture Search signal terminal (P / S) and a Picture Search signal in a state where a Picture Search signal is input to the Picture Search signal terminal (P / S). Search big: hereinafter called big) signal, Program Search Equal (hereinafter referred to as Equal) Program Search Small (hereinafter referred to as Small) signal is inputted to the controller of the video recording player And a mode signal input / output unit 10 for outputting a picture search (PB) operation signal, a PB (Paly Back) signal, and a fast forward picture search (FPS) operation signal, and a program setting key and a program key up-down key. A search program setting unit 20 for outputting a search program pulse and search program data set by a program key up-down key according to a user's setting, and a tom output from the search program setting unit 20; A display unit 30 that encodes color program data to detect a program setting limit signal, and simultaneously decodes and displays the search program data, and a division clock for outputting high frequency pulses enabled by the search program pulses and 1 / N divided by the search program pulses. The generator 50 and the search program data output from the search program setting unit 20 are inputted, and the divided clock output from the frequency division clock generator 50 is counted to compare the search program data with the counted data. A counting comparison unit 60 for outputting an equal or big signal to the mode signal input / output unit 10, a search program pulse output terminal of the search program setting unit 20, and a program setting limit signal output terminal of the display unit 30; Is connected to the equalization signal terminal of the counting comparator 50 to generate the search program pulse until the equalization signal is input. A search program signal output unit 40 provided as an enable signal of the unit 50 and a search program pulse output from the search program signal output unit 40 to switch the search program pulses to an audio track of a tape. A selection output section 70 for recording and outputting it in the playback mode; and picking up an audio signal from a tape and outputting the audio signal to the selection output section 70. The search program pulse section recorded in the picture search mode is a predetermined clock. The search program setting unit 20 adds predetermined data to the counting data of the playback signal counting output unit 80 and the search program pulse section outputted from the playback signal counting output unit 80 for counting and outputting the counted data. Inverse addition ratio outputting the small signal to the mode signal input / output unit 10 when the counting data is small compared with the search program data to be output. It consists of a part 90.

FIG. 2 is a detailed circuit diagram of one embodiment of the block diagram of FIG. 1 and includes a resistor R1-R3, a diode D1-D6, an inverter N1, an AND gate AN1, and a transistor Q1-Q3. Operation mode signal input / output unit 10, program switch (PROSW) (21), UP / DOWN switch (22-23) and reset switch (24) ), A search program setting unit 20 composed of an up / down counter 25, a capacitor C1-C2, a resistor R4-R5, a diode D7, and an inverter N2, and an inverter N3-N4. And a display unit 30 composed of an AND gate AN2, a decoder 31, and a segment element SE, a resistor R6, a transistor Q4-Q5, an oscillator 51, and a 1 / N divider 52. And a divider clock generator 50 comprising an AND gate (AN3) and a latch circuit (53), a resistor (R5), a capacitor (C3), a diode (D8-D11), a counter comparator (61), and a count (62). Counting comparison unit 60, inverters (N5-N6) and Anne A search program signal output unit 40 comprising a gate AN4, an analog switch SW, a resistor R7-R7 ', a diode D12-D15, an inverter N7, a buffer BUF1-BUF2, Selectable output 70 composed of write head RH, resistors R8-R10, capacitors C4-C6, diodes D16-D21, inverters N8-N9, and gates AN5-AN6. And a regeneration signal counting output unit 80 composed of a Schmitt trigger gate SG, a regeneration head PH, an oscillator 81, a toggle flip-flop 82, an up counter 83, and a latch circuit 84, and an inverter. (N10-N13), and an inverting addition comparator (90) consisting of an adder (91) and a comparator (92), wherein SS is a detection signal input terminal of a start sensor, and P / S is a picture search signal input terminal. And ES end sensor signal input terminals, REC is a recording signal input terminal, and 100 and 200 are audio signal input and output terminals.

The collectors and emitters of the transistors Q1, Q2, and Q3 of the mode signal input / output unit 10 in the above configuration are the controllers of the video recording and reproducing apparatuses, for example, FPS (Fast Forward Picture Search) and PB (Paly Back) of MICOM. ), RPS (Rewind Picture Search) key is connected to the input port.

3 is a diagram for setting the search program for the entire length of the tape. When the total length of the tape is Tℓ, the total length Tℓ of the tape is n programs (for example, n programs are recorded on a 120 minute tape). As shown, in the example of the present invention, the program setting limit is set to eight. In other words, when the length of the 120-minute tape is Tℓ, the program setting limit is set to eight. (Program setting limits can be changed depending on the type of tape and recording mode SLP, LP, SP).

In this design, the program setting limit of 8 is set assuming that the minimum time of one program (movie or lecture program) is 15 minutes.

4 is a partial operation waveform diagram of FIG. 2, where a is PROSW 21, a search program pulse is turned on / off, b is an output pulse of the 1 / N divider 52 of FIG. 2, and c is FIG. The waveform diagram of the audio output terminal 200 of the selection output unit 70, d is the waveform diagram of the switching control terminal (CTL) in FIG.

Hereinafter, an example of the operation of the block diagram of FIG. 1 according to the present invention will be described with reference to FIGS. 2, 3, and 4, which are specific circuit diagrams. Assuming that a signal is input and a regeneration operation is performed.

Now, when the playback of the tape reaches a point of the total length Tl of the tape by the above playback operation, i.e., when the point (1) is reached at the total length Tl of the tape as shown in the third degree, the PROSW (21) is When pressed once for a predetermined period as shown in FIG. 4A, the "high" signal of the search program pulse caused by "on" of the PROSW 21 is clocked up by the up / down counter 25 through the diode D7. And input to the AND gate AN4 and the inverter N2.

The up / down counter 25 for inputting the signal by pressing the PROSW 21 to the up clock terminal up is " 0 " (Q3-Q0) energized by the capacitor C1 and the resistor R4. The input clock is counted up in the output state of the control unit and the search program data 000l (binary = " 1 ") is compared with the comparators 61, 92, the decoder 31, the inverter N3, N4 and the end. The encoder is input to an encoder configured by the gate AN2.

At this time, the AND gate AN2 outputs "low" to the segment SE to enable and outputs the same to the inverter N5, and the decoder 31 decodes the search program data "1", which is up-counting data, to the segment. Display (SE) as decimal "1".

On the other hand, the comparator 61 which inputs the output of the up / down counter 25 resets the energization by the search program data "1" output from the up / down counter 25, the initial capacitor C3, and the resistor R5. By comparing the outputs of the up counter 62 outputting "0", the matching signal output terminal (=) outputs the "low" Equal signal to the inverter N6.

Accordingly, the AND gate AN4 outputs a search program pulse of "high" due to "on" of the PROSW 21 to the AND gate AN3 and the diodes D13-D14.

The diode D13 inputting the search program pulse of "high" output from the AND gate AN4 makes the recording terminal REC a signal of "high" through the resistor R7, and the diode D14 is not. Switch the log switch (SW) to the recording terminal (REC).

At this time, the buffer BUF1 and the buffer BUF2 connected thereto buffer the search program pulse of the "high" state input through the resistor R7 and apply it to the recording head RH so that the search program pulse is the audio of the video tape. Let it be written to the track.

On the other hand, in the state where the search program data pulse is recorded on the audio track of the video tape as described above, the oscillator 51 continuously oscillates the high frequency frequency (9 x 25 KHZ x N) higher than the maximum frequency 25 (KHz) of the sound band. And 1 / N divider 52, and 1 / N divider 52 divides the high frequency oscillation inputted by 1 / N into the same pulse as the 4b degree (9x25KHz) and gate (AN3). Output to one input terminal of).

Therefore, the AND gate AN3 receives the 1 / N division clock 9 × 25KHZ output from the 1 / N divider 52 and the latch circuit DF / while the AND gate AN4 outputs the search program pulse in the high state. F) is inputted to the clock of 53, which causes the latch circuit 53 to output a clock divided by 1 / N through the transistor Q5 as the clock pulse of the up counter 62.

Accordingly, the up counter 62 counts the clock pulse input through the transistor Q5 and outputs the data "1" to the adder 91 through the diodes D8-D11.

In this case, the comparator 61 compares the equality high signal with the search program data " 1 " output from the up / down counter 25 and the data " 1 " The signal is output to the signal output terminal (=) and output to the AND gate AN1 and the inverter N6.

In addition, the inverter N6 inputted as the "high" state Equal signal output from the comparator 61 inverts this and outputs the "low" signal to the AND gate AN4, which causes the AND gate AN4 to "high". The search program pulse outputted by " inverted " is outputted to the AND gate AN3 and the diodes D13 and D14.

Therefore, the search program pulse of the "high" state output from the AND gate AN4 is the search program data of the up / down counter 25 counting the pressing of the PROSW 21 and the output "high" of the AND gate AN4. By " low " after the output of the up counter 62 which counts the clock through the AND gate AN3 and the latch circuit 58 is the same.

At this time, the AND gate AN3 inputting the output “low” of the AND gate AN4 blocks the output of the 1 / N divider 52 input to the other side to block the clock input of the up counter 62.

On the other hand, the diodes D13 and D14, which input the " low " signal outputted from the AND gate AN4, are opened (blocked), so that the analog switch SW is turned on the recording terminal REC. Is switched to the regeneration terminal PB at which the recording of the search program pulse is interrupted. Accordingly, it can be seen that the video tape outputs the search program data pulses output from the AND gate AN4 as shown in FIG. 4C (1). That is, the search program pulse is recorded only for one period of the 1 / N frequency division clock output from the 1 / N frequency division body 52.

As described above, when the PROSW 21 "turned on" after recording the search program pulse corresponding to one cycle of the clock pulse divided by 1 / N by pressing the PROSW 21 "turns off", the inverter N2 inverts it. The signal of " high " is delayed by a differential circuit composed of the capacitor C2 and the resistor R5, so that the reset terminal R of the up counter 62 and the base and latch circuit 53 of the transistor Q4 are delayed. Input to the reset terminal (R). At this time, the up counter 62 is reset and outputs "0". When the transistor Q4 is turned "on", the set terminal S of the latch circuit 53 becomes "low", and the reset terminal R of the latch circuit 53 becomes "high". The latch circuit 53 is also reset.

On the other hand, after a predetermined time has elapsed, when the second program is finished, the PROSW 21 is pressed for a predetermined time as shown in FIG. 4A (B) at the point (2) of FIG. 3, that is, the second time the PROSW 21 is pressed. It is input to the up terminal of the up-down counter 25 through D7), and is input to the AND gate AN4, and to the inverter N2.

Accordingly, the up / down counter 25 counts the input pulse in the state of outputting "1" and outputs "10" to the output terminals Q3-Q0 to the AND gate AN2, the inverter N3-N4, and the decoder ( 31) and output to the input terminals AD of the comparator 61 and the comparator 92, respectively.

At this time, the inverters N3-N4 invert the outputs "0" and "1" of the output terminals Q1 and Q2 of the up / down counter 25 so that the AND gate AN2 is "low" as described above. A signal is output to enable the segment SE and simultaneously output the signal to the inverter N5. The decoder 31 decodes the output from the output terminals Q3-Q0 of the up / down counter 25 and displays second program data. That is, the decimal number "2" is displayed in the segment SE.

The comparator 61 which inputs the search program data 0010 outputted from the up / down counter 25 is reset by the capacitor C2 and the resistor R5 and outputs "0". Different from the output, the equal signal "low" is output to the match signal output terminal (=). At this time, the inverter N6 inverts the equal signal of the "low" high, and the AND gate AN4 receives the search program pulse of "high" by "on" of the PROSW 21 and the one terminal of the AND gate An3. The output of the diodes D13-D14 is output to the anode to record the search program data through the recording head RH as described above.

The AND gate AN3, which inputs the search program pulse of “high” output from the AND gate AN4, is oscillated by the oscillator 51, and the 1 / N divider 52 receives the up counter (V) through the transistor Q5. 62).

Therefore, the up counter 62 outputs the counting data obtained by counting the divided clock inputted by 1 / N to the comparator 61, and when the output terminals D3-D0 of the up counter 62 become "10". The counting comparator 61 outputs the equal signal of the high state to the inverter N6 through the comparison signal output terminal (=). Therefore, the AND gate AN4 interrupts the search program data pulse in the " high " state and outputs the " low " signal.

Therefore, as shown in (2) of FIG. 4C, a signal having a duration of a search program pulse (twice than when the first PROSW 21 is pressed) corresponding to two cycles of 1 / N division clock is recorded on the audio track of the video tape. At this time, the pulse duration recorded on the tape is determined by the 1 / N divided clock 9 x 25KHz. The reason for the 1 / N output of the oscillator 51 is that the frequency is increased by the speed of the filter search when operating in the picture capture mode. . (N is a non-zero natural number search speed.)

Therefore, when the PROSW 21 is pressed twice, the "high" search program data pulse output from the AND gate AN4 corresponds to two cycles of the 1 / N division clock output from the 1 / N divider 52. The reason is that the output " high " of the AND gate AN4 is enabled by search program data " 10 " of the output of the up-down counter 25 and the output " high " This is because the 1 / N division clock outputted at 50 is continued until the up counter 62 counts as "10" and outputs it to the comparator 61.

When the up counter 62 counts the clock input through the transistor Q5 and outputs the count data "10" to the comparator 61 through the output terminals D3-D0, the comparator 61 is up with the input. Comparing the outputs of the / down counter 25, the Equal signal of "high" state is output as equal. At this time, the AND gate AN4 transitions the "high" signal to low and outputs the low signal, thereby converting the duration of the search program pulse according to the number of times the PROSW 21 is pressed. The up counter 62 and the latch circuit 53 are reset by the operation of the inverter N2, the capacitor C2, and the resistor R5 whenever the PROSW 21 is " off ".

In this manner, the " high " search program pulses can be recorded on the audio track of the video tape together with the 4d diagram until the " high " signal is output from the AND gate AN2. At this time, the search program pulse is recorded on the videotape only until the AND gate AN2 outputs the logic "high" search program setting limit signal.

When the PROSW 21 is pressed nine times, the up / down counter 25 up counts the search program pulse input nine times through the diode D7 and outputs the search program data “1001” to the output terminals Q3-Q0. do. At this time, the inverter N3-N4 inverts " 0 " output from the output terminals Q2-Q1 of the up / down counter 25 to " 11 ", so that the AND gate AN2 receives a logic " high " signal. Input to the inverter N5.

Therefore, when PROSW 21 is pressed nine times, inverter N5 outputs "low" and AND gate AN4 outputs a signal of "low" regardless of another input signal, so that the search program is no longer set. Do not

On the other hand, as described above, while playing and watching the video tapes having different duration periods of the search program pulses recorded according to the number of presses of the PROSW 21, the current tape position is positioned between FIGS. 3 (3) and (4). Is reached, that is, when the user watches the fourth set program and presses the low up switch 22 four times while the signal of FIG. 4C (3) is reproduced, the output of the up / down counter 25 is output. Becomes "100". At this time, the output of the up / down counter 25 is input to both input terminals of the inverters N3-N4 and AND gate AN2 and simultaneously to the decoders 31 and the comparators 61 and 92, respectively.

The recorder 31 decodes the search program data "100" which is the output of the up / down counter 25 and displays the decimal number "4" through the segment SE.

When the fast forward picture search key is pressed and the picture search signal “high” is input to the terminal P / S while the search program to be searched is set as described above, it is input to the AND gate AN1 and simultaneously input to the inverter N1. The system is operated in the fast forward picture search mode by the fast forward picture search key signal.

The inverter N1 inputting the picture search signal "high" inverts the signal and outputs a signal of "low" through the diodes D6-D7 to the reset terminal of the up counter 83 and the toggle flip-flop 82. By this, the toggle flip-flop 82 and the up counter 83 are reset.

At this time, if the audio signal shown in Fig. 4C (3) loaded on the audio track of the tape rotated at the speed of the fast forward picture search mode is picked up by the playhead PH, the picked-up signal is the analog switch SW. The output signal is output to the reproduction signal reproduction terminal PB, and is output through the buffer BRF1 and the output terminal 200 and simultaneously input to the Schmitt trigger gate SG. ^[* The diode D14 is OFF (blocking) state and then the analog switch SW is applied to the control terminal CTL is at a low switching by the analog switch SW is reproduced terminal (PB) being state;

The Schmitt trigger gate SG which inputs the audio signal reproduced and output from the playhead PH as shown in FIG. 4C (3) converts it into a square wave, inputs it to the clock of the latch circuit 84, and at the same time the capacitor C4. The up counter 83 is reset through a differential delay circuit composed of and a resistor R8 and diodes D16-D17.

The high frequency clock (9 x 25KHz x N) continuously oscillated by the oscillation section 81 is input to the AND gate AN5 by the resistor R9 and the capacitor C5.

Therefore, the AND gate AN5 is an output terminal of the coggle flip-flop 82. Outputs the high frequency clock (9 x 25KHz x N) output from the oscillator (81) as the clock of the up count (83) by the "high" signal output from the initial reset state in the The counting data " 1001 " is counted by counting the high frequency clock inputted through the AND gate AN5 at the up counter 83 before the audio signal (up to 20 KHz) outputted as shown in (3) of FIG. As another data is output to the inverters N8-N9 and the AND gate AN6, the AND gate AN6 transitions the state and outputs the clock as the toggle flip-flop 82 clock signal.

( ^* Toggle Flip-Flop 82 Output Terminal Remains “high” immediately after a reset is released until a clock signal is input.)

Therefore, the output state of the toggle flip-flop 82 transitions and the output terminal In (Q), the up counter 83 is reset by outputting "low" and "high" to the reset terminals of the AND gate AN5 and the up counter 83, respectively.

When the search program data pulse is detected in the audio playhead PH as shown in (4 ') of FIG. 4C during the rewind operation as described above, the AND gate AN5 performs the derivative of the capacitor C4 and the resistor R8 that differentiate it. By the output, the up counter 83 and the toggle flip-flop 82 are reset at the up edge of Fig. 4C in Fig. 4C. At this time, the AND gate AN5 is an output terminal of the toggle flip-flop 82. The "high" signal outputted from the oscillation clock (9 x 25KHz x N) output from the oscillator 81 is multiplied and output as a clock of the up counter 83 so that the up counter 83 generates the oscillation clock (9 x 25KHz x). N) is counted and output to the latch circuit 84.

When the waveform of (4) of FIG. 4C reproduced from the reproduction head PH becomes DOWN EDGE as shown in (4b), the latch circuit 84 latches the output data of the up counter 83 to obtain a comparator ( 61) and the adder (92).

At this time, the data latched and output by the latch circuit 84 is " 100 " (Q3, ..., Q0). The reason why the output data of the latch circuit 84 is " 100 " is that the clock inputted by the up counter 83 through the AND gate AN is input by the up counter 83 during the duration (4 ') of FIG. 4C. This is because the counted data is latched at the falling edge of Fig. 4C (4 ').

At this time, the comparator 61 inputting the data "100" output from the latch circuit 84 is the same as compared with the search program data "100" output from the up / down counter 25, so that the match signal output terminal (=) Outputs a high signal of equality and inputs it to the AND gate AN1. Therefore, the AND gate AN1 inputs the "high" signal to the base of the transistor Q2 through the resistor R2 by the picture search signal "high" input to the terminal P / S.

Thus, the transistor Q2 is " on " and outputs a play mode signal to the microcomputer so that the system can find out what the user wants to search and play automatically.

Therefore, the playhead PH picks up an audio signal of a tape operated as a fast forward picture and inputs it to the Schmitt trigger gate SG, and the Schmitt trigger gate SG outputs the waveform by shaping it. When the program data is picked up to the playhead PH as shown in Fig. 4C (4 '), the up counter 83 outputs the data "100" counting four pulses as shown in Fig. 4B to the latch circuit 84. The latch circuit 84 latches the data " 100 " output from the up-counter 83 when 4 'in Fig. 4C becomes the down edge and counts the comparator 61 through the diodes D18-D21. It is operated by playing by inputting to.

On the other hand, the user resets to search for a position as shown in FIG. 2 (2) in which the user has programmed a program in which the current position of the tape is located between FIGS. 3 (2) and (3) during playback. Pressing the switch 24 once and then pressing the down key 22 twice causes the down clock to be reset and the counter 25 is reset and counts the pulses input to the down terminal DOWN to count the counting data "10". Outputs

Therefore, the seven segment element SE displays a decimal number "2" in which "10" is decoded by the AND gate AN2 and the decoder 31. The comparator 61 receives search program setting data " 10 " output from the up / down counter 25.

In this case, when the rewind picture search mode signal "high" is input to the terminal PS, the input of the rewind picture search mode signal is input to a microcomputer (not shown), and the microcomputer operates the system in the rewind search mode. The rewind picture search mode signal " high " is input to the AND gate AN1 through the diode D2 as described above, and is inverted by the inverter N1 to be up countered through the diodes D6 and D7. (83) and the reset terminal of the toggle flip-flop 82 are input.

Therefore, the up counter 83 and the toggle flip-flop 82, which had been reset before the "high" signal was input to the terminal PS, are reset, and are operated in the rewind picture search mode so that the playhead (PH) The audio signal of the tape picked up as shown in FIG. 4C is input to the Schmitt trigger gate SG and waveform-shaped.

The up counter 83 which is reset by the rewind picture search signal " high " counts and outputs the oscillation clock (9 x 25KHz x N) of the oscillator 81 output from the AND gate AN5.

The up counter 83 which inputs the clock output from the AND gate AN5 counts a plurality of input clocks before one audio signal as shown in (3) of FIG. 4C is played back from the playhead PH. In this case, the up counter 83 counts a plurality of input clocks before one cycle of the audio signal is reproduced, so that the output of the oscillator 81 is 9 x N of the audio signal frequency (where N is not zero). This is because the natural number is set to search speed). Accordingly, the up counter 83 counts a plurality of clocks inputted through the AND gate AN5 during the period in which the audio signal of (3) audio signal of FIG. 4C is waveform-formed by the Schmitt trigger (SG). Output is performed to the latch circuit 84, inverters N8-N9, and AND gate AN6.

In this case, when the output of the output terminals Q0-Q3 is "1001", the up counter 83 transitions the output state of the AND gate AN6 from "low" to "high", which causes the output of the toggle flip-flop 82. Output terminal changes status Up counter 83 is reset by outputting " high "

(At this time, the counting data up counted from the up counter 83 is before the Schmitt trigger gate SG waveform shaping the half of the audio signal and outputs the down edge signal. Therefore, the latch circuit 84 does not have a clock. Couldn't)

In this manner, when the audio signal of the tape is continuously picked up to perform the rewind picture search mode, a search program pulse having a duration as shown in FIG. 4C (2 ') is detected at the playhead PH, and thus the Schmitt trigger gate SG. When input to, the Schmitt trigger gate (SG) is waveform-shape and then output to the differential delay circuit consisting of the capacitor (C4) and the resistor (R8) and at the same time as the clock of the latch circuit (84).

At this time, the differential circuit composed of the capacitor C4 and the resistor R8 is connected to the up counter 83 at the rising edge 2b of the search program pulse (2 'in the rewind state, 2b being the rising edge) of FIG. 4C. Resets the toggle flip-flop 82.

Therefore, the toggle flip-flop 82 has an output terminal Logic "high" to input to AND gate (AN5), which causes AND gate (AN5) to input the inverted clock (9 x 25KHz x N) output from oscillator (81) as clock of up counter (83). Let's do it.

Therefore, the up counter 83 counts and outputs the oscillation clock (9 x 25KHz x N) input to the clock terminal during the duration of the search program pulse as shown in (2 ') of FIG. 4C. The search program pulses such as 2 are recorded so as to correspond to two periods of the 4th degree and the same pulse during recording.

Therefore, the up counter 83 counts the period (2 ') of FIG. 4C as the output clock of the oscillator 81, and outputs data "10".

At this time, the latch circuit 84 which inputs a pulse as shown in FIG. 4C (2 ') output from the Schmitt trigger gate SG as a clock has a down edge (2a) as shown in FIG. 4C (2'). ) And latches the data " 10 " counted and output by the up counter 83 and outputs the same to the comparator 61 through the diodes D18-D21.

On the other hand, the comparator 61 which inputs the user's search program data "10" output from the up / down counter 25 and the data "10" output from the substitution circuit 84 has a "high" value because the two input data are the same. The AND gate AN1 outputs the "high" signal to the base of the transistor Q2 by outputting the equality "high" signal to the output terminal =.

Therefore, the microcomputer determines that the play mode is "ON" by the transistor Q2, and the system stops the rewind picture search mode and plays.

If the playback of the tape reproduces between the section 2 'of FIG. 4C and the section (3) of FIG. 4C, the search program data output from the up / down counter 25 using the upswitch 22 is " 100 " In the case of setting " (data for searching the fourth program in decimal 4) and pressing the rewind switch, the search mode of data is rewind searched in the section (2 ') of FIG. 4C.

When the playhead CPH picks up the search program pulse as shown in FIG. 4C (2 ') in the rewind search mode, the up counter 83 operated as described above is shown in FIG. 4C (2'). The data "10", which is the duration data, is outputted, and the latch circuit 84 latches the output of the up counter 83 and inputs it to the comparator 61 and the adder 91.

At this time, the adder 91 adds " 110 " input to the data input terminals D0-D3 to the output data " 10 " of the latch circuit 84 to add data " 1000 " (decimal " 8 ") to the inverter N10. -N13) inverts and outputs the data "1" to the comparator 92.

On the other hand, the comparator 92 which inputs the inverted input data "1" for the inverters N10-N13 has a small counting data compared with the data "100" set by the user in the up-down counter 25 described above. Outputs a small signal to the output terminal (>) and inputs it to the base of the transistor Q1 through the diode D4 and the resistor R1.

Accordingly, transistor Q1 is " turned on ", which causes the microcomputer (not shown) to determine that it is a fast forward picture and stops rewinding and performs the picture search mode. Therefore, when the playback of the current tape is between the positions of FIGS. 3 (2) and (3), the program of FIG. 3 is searched and the search program "4" is set and rewinded. Automatically switch to search mode.

As described above, after the fast forward picture search mode is switched, the operation is performed in the same manner as the above-described operation, and then, when the (4 ') search program pulse section of FIG. 4C is detected, the operation is automatically performed.

On the contrary, rewind picture search should be performed. When fast forward picture search is performed by a user's key manipulation mistake, the mode is automatically switched to the fast forward picture search mode.

That is, the search program data which is the output of the up / down counter 25 using the up switch 22 in the state in which the tape is playing back the section (2 ') of FIG. 4C and (3) of FIG. When "(data for searching the first program in decimal 1) is set and the rewind switch is pressed, the search mode of data is fast forward searched to the section (2 ') of FIG. 4C.

In the fast forward search mode, when the playhead CPH picks up a search program pulse as shown in FIG. 4C (3 '), the up counter 83 operated as described above is shown in FIG. 4C (3'). Outputs the duration data of " 10 ", and the latch circuit 84 latches the output of the up counter 83 and inputs it to the comparator 61 and the adder 91.

On the other hand, the counting comparator which inputs the user's search program data "1" output from the up / down counter 25 and data "100" output from the rich circuit 84 has a big signal indicating that the output of the latch circuit 84 is large. High "is output to the output terminal (<), and" turns on "transistor Q3.

Therefore, by turning on the transistor Q3, the microcomputer determines the rewind mode, stops the fast forward picture search mode, and outputs the rewind control signal to operate the tape in the rewind picture search mode.

As described above, the operation after switching the rewind packer search mode is operated in the same manner as the above-described operation, and then, when the (1 ') search program pulse section of FIG. 4C is detected, the operation is automatically performed.

As described above, when the present invention is recorded, the search program data is randomly set and recorded on the audio track, and when the user searches for the search program data recorded by the user, the search program data is set using the up and down keys to automatically enter the picture search mode. There is an advantage that can be convenient for the user by navigating and finding a place to play and play.

Claims (1)

A microcomputer for controlling the system according to an operation signal, an output terminal is connected to the operation signal input terminal of the microcomputer, has a picture search signal terminal (P / S), the picture search signal terminal (P / S) Program automatic of video recording player having mode signal input / output unit 10 which outputs RPS operation signal, PB operation signal and FPS operation signal to the microcomputer when big signal equal signal and small signal are inputted while signal is input A search circuit, comprising: a program setting key and a program up / down key, and counting inputs of the program setting key and program up-down key with a search program pulse and search program data set by the program setting key program up / down key; The input terminal is connected to the search program setting unit 20 and the output terminal of the search program setting unit 20 to be outputted. A display unit 30 that encodes search program data to detect a program set limit signal, and simultaneously decodes and displays the search program data, and a frequency division clock that is enabled by the search program pulses and outputs high frequency pulses divided by 1 / N. The generator 50 and the search program data output from the search program setting unit 20 are inputted, and the divided clock output from the frequency division clock generator 50 is counted to compare the search program data with the counted data. A counting comparison unit 60 for outputting an equal or big signal to the mode signal input / output unit 10, a search program pulse output terminal of the search program setting unit 20, and a program setting limit signal output terminal of the display unit 30; Is connected to the equalization signal terminal of the counting comparator 50 and divides the search program pulse until the equalization signal is input. The search program signal output unit 40 provided as an enable signal of the generation unit 50 and the search program pulses output from the search program signal output unit 40 are switched to convert the search program pulses into an audio track of a tape. And a search program pulse section recorded in the picture search mode by picking up an audio signal from a tape and outputting it to the selection output section 70. The reproduction signal counting output unit 80 counting and outputting the clock and the counting data of the search program pulse section outputted from the reproduction signal counting output unit 80 are added to the predetermined data and inverted to thereby search program setting unit 20. Inverse addition comparison outputting a small signal to the mode signal input / output unit 10 when the counting data is small compared to the search program data output from Program automatic search circuit of the video recording and reproducing, characterized in that it comprises a section (90).