KR20010036847A - Reproducing method using link functions of video cassette recorder - Google Patents

Abstract

PURPOSE: A method for playing a VCR using a link function is provided to automatically switch a mode by receiving a minimum key input from a user but grasping both conditions of a VCR and a television set through a communication therebetween by virtue of a control line. CONSTITUTION: If a key related to playing is inputted, a television set is requested to transfer a condition information through a control line(CTL). The condition information transferred from the television set is grasped. A power on instruction is transferred to the television set, if necessary. It is ascertained if the television set is switched into a predetermined link channel. If the television set is determined not to be switched into the link channel, a switching instruction is output to the television set. The condition data transferred from the VCR is analyzed. If a link play on condition requested is established, a playing operation is executed and a video signal and an audio signal are displayed.

Description

How to play V-Cal using link function {REPRODUCING METHOD USING LINK FUNCTIONS OF VIDEO CASSETTE RECORDER}

The present invention relates to a technology in which a V-Cal and a television receiver transmit and receive necessary information through a control line to more easily perform a playback function. In particular, the TV receiver is connected to the V-Cal through a control line, The present invention relates to a method of playing a V-Cal using a link function that communicates necessary information between video devices to perform a playback function with a minimum key input.

In the conventional television receiver and VLC link system, the video program or the audio signal is simply transmitted through a dedicated transmission line to reproduce or record the required program. Therefore, in the link system, when the user wants to perform the playback function, the user must input the control command for each of the two video devices by using a remote controller or the like.

As described above, in the conventional video device link system, when the two video devices want to perform one function related to each other, such as a playback function, the user has to inconvenience the power key and various keys.

Accordingly, an object of the present invention is to provide a minimum key input from a user when performing a playback function in a video device link system, and to grasp the state of each other while the V-Cal and the television receiver communicate with each other through a control line. The present invention provides a method of reproducing V-Cal using a link function that automatically switches modes.

1 is a block diagram of a V-C is applied to the reproduction method of the present invention.

2 is a format diagram of a physical layer frame on a control line according to the present invention;

3A to 3C are timing diagrams of signal bits transmitted through a control line.

FIG. 4 is a table showing standards of parameters constituting each symbol in FIG. 3. FIG.

5a is a signal flowchart of a power control method according to the present invention;

5b is a signal flowchart of a method for automatically switching a link channel according to the present invention;

5C is a signal flowchart of a link reproducing method according to the present invention;

6 is a format diagram of a local device control signal according to the present invention;

7 is a format diagram of a data request signal according to the present invention;

8 is a format diagram of a data response signal according to the present invention;

Fig. 9A is a timing check explanatory diagram of start bits for confirming the ATV link format.

Fig. 9B is a timing check explanatory diagram of an application identifier (A.ID).

10A is a format diagram of a link master among components of a header block.

Fig. 10B is a format diagram of a slave address among the components of the header block.

11A is a format diagram of extended commands among the components of a command block.

Fig. 11B is a format diagram of a control command among the components of the command block.

11C is a format diagram of a message end bit among components of a command block.

12A is a link reproduction on format diagram of a data operation block.

12B is an image on format diagram of a data operation block.

12C is a format diagram of local device state information for a call response.

12D is a format diagram of the current state information of a local device for performing link playback.

12E is a format diagram of link channel state information.

12F is a format diagram of clock information.

12G is a format diagram of channel preset data.

Fig. 12H is a format diagram of real time count data for tape travel.

12I is a format diagram of tape remaining value data.

13A is a format diagram of ″ year ″ data.

Fig. 13B is a format diagram of ″ month ″ data.

Fig. 13C is a format diagram of "one" data.

Fig. 13D is a format diagram of "time" data.

13E is a format diagram of ″ minute ″ and ″ second ″ data.

Fig. 13F is a format diagram of ″ Note ″ data.

Fig. 13G is a format diagram of ″ power state ″ data.

Fig. 13H is a format diagram of ″ channel band ″ and ″ channel number ″ data.

Fig. 13I is a ″ state ″ data format diagram of VRC.

Fig. 13J is a format diagram of ″ audio state information ″ data.

Fig. 13K is a format diagram of data " tuner / deck operation mode "

Fig. 13L is a format diagram of the ″ DV / VR mode ″ data.

Fig. 13M is a format diagram of ″ tape speed ″ data.

Fig. 13N is a format diagram of ″ tape and safety tab ″ data;

*** Description of the symbols for the main parts of the drawings ***

10: TV receiver 11: TV microcomputer

12: memory 13: on-screen part

20: V seed 21: micro computer for V seed

CTL: Control Line

When the playback related key is input to the VR, the method of reproducing the VR is to request the TV receiver to transmit the status information through the control line, and then to grasp the transmitted status information to determine the power OFF state. A first step of transmitting a power-on command to the television receiver; A second step of confirming whether or not the television receiver is switched to a preset link channel through the control line and transmitting a command to the television receiver to switch to a link channel if it is determined that the television receiver is not switched; When the required link reproduction condition is established by analyzing the state data transmitted from the BC, a third process of outputting a link reproduction command to the BC side and displaying the video and audio signals reproduced and output therefrom is performed.

FIG. 1 is a block diagram of a link reproducing apparatus of a video device to which a reproducing method of the present invention is applied. As shown in FIG. 1, when a reproducing key is input by a user, a VRL 20 is connected through a control line CTL. A television receiver (10) for automatically switching the operation mode internally or for requesting mode switching to the opposite side so as to be linked to perform the required playback function; It is linked with the television receiver 10 through a control line (CTL) and communicates in an online communication method, so as to grasp each other's state and automatically switch the operation mode internally or appropriately to perform the required link playback function. Vial 20 and requesting; The television receiver 10 and the V20 constitute a control line (CTL) for identifying the state of each other for link reproduction and transmitting a mode (state) switching request command.

The television receiver 10 is linked to the imager through the control line (CTL) and communicates in an online communication method, and automatically switches an operation mode or a mode to a counterpart so as to grasp each other's state and perform a required function. A TV microcomputer 11 for requesting switching; A memory 12 for managing information for displaying the functions of the partner video apparatus, the status information of the television receiver 10, the information to be transmitted, and the status information of the VR; An on-screen unit 13 for generating character information on-screen signals for a user under the control of the microcomputer 11; A transmission / reception port (Tx / Rx) for preventing data collision when communicating through the control line (CTL); It is composed of a pull-up resistor (R2) for maintaining the communication signal of the control line (CTL) at a constant level, and will be described with reference to FIGS. 2 to 4 attached to the operation of the present invention configured as described above.

When the television receiver 10 is connected and communicated with the VRT 20 through the control line CTL, pull-up resistors R2 and R4 on the control line CTL to maintain the communication signal at a constant level. ) Was used.

First, the characteristics of the communication for link reproduction between the television receiver 10 and the VRF 20 are as follows.

First, in the present invention, the on-line communication method was applied, and each transmission / reception port (Tx / Rx) was used as a countermeasure against data collision during communication. In addition, communication is performed in units of one word, and the data collision detection side switches to the reception mode during communication. _Wait for a predetermined time (T _WAIT = 3 bits) in the standby state (control line: 'high') before starting communication. In the case of N word data communication, a predetermined waiting time (T _WAIT = 40 to 60 msec) is maintained between each word data, and the data is transmitted from the most significant bit (MSB) at the data interface.

Second, the transmitting side detects an acknowledgment signal ACK to check whether the receiving side receives normal data. If the acknowledgment signal ACK is not detected, the transmitting side has a predetermined waiting time (T _WAIT ≤ 1000 msec) and then again. If the same data is transmitted and the acknowledgment signal ACK is not detected continuously, the above operation is repeated after a predetermined number of times (for example, five times), and then ends.

Third, the response time at the receiving side is within a predetermined time (T _RESPONSE = 200 msec).

Fourth, according to the link chain configuration as shown in FIG. 1, it is possible to continuously connect the video devices other than the respective devices, for example VRC 20, and each of these devices can be independently connected. Operates with a stream / downstream stream. In addition, bi-directional interconnection is possible, and signal transmission paths can be switched in the video device of the master or slave. Easy to install or replace

Meanwhile, FIG. 2 illustrates a format of a physical layer frame on a control line CTL when two video apparatuses communicate through the control line CTL. Same as

The start sequence has an ATV (Automatic TeleVideo) link format and includes a start bit (S) and a three mode bit (A.ID). Here, the start bit S is for checking the start and format version of the new link frame, and the application identifier A. ID is for checking the ATV link version_01 format (= '001').

The header block is for identifying the source and destination of the current communication link, which is a link master (LM), a slave address (SA), and an acknowledgment bit (ACK). ) Here, the link master LM represents information of the current link master, and the slave address SA represents information of the slave address (Destination). In addition, the acknowledgment bit (ACK) is a bit indicating whether the header data is normally received. The acknowledgment bit (ACK) outputs a command block after confirming the acknowledgment bit (ACK) output from the receiver. For example, if ACK = 0, it means that the receiver has processed the received data. If ACK = 1, it means that the data reception error or received data has not been processed at the receiver.

The command block is an extended command table (ECT), a control command (CMD), and a message end bit based on an interface operation code (OP code) for local device control and data checking between devices. (EOM) (EOM: End of Message) and Acknowledgment Bit (ACK). Here, ECT = 0 means a normal control opcode, and ECT = 1 means a reserved area to be used in the future. The control command CMD is a field of a link communication opcode and includes a control, a display, and a general command.

The data block is an interface operand data block between devices, and includes a message end bit (EOM) and an acknowledgment bit (ACK) as well as control or display data. The control and display data of N words are transmitted using the control or display data.

In the command block and the data block, the message end bit (EOM) is an information bit for determining whether the control block depends on the current link block at the transmitting side. If EOM = 0, there is a dependent communication block. If EOM = 1, this means that there is no dependent communication block. In this case, the link control is completed after checking the acknowledgment bit (ACK).

The acknowledgment bit (ACK) is a bit indicating whether the communication block receives normal data on the receiving side. The transmitting side checks the acknowledgment bit (ACK) transmitted from the receiving side and takes the following control operation. For example, if ACK = 0, it means that the receiving side has processed the received data. If EOM = 0, the transmitting side transmits the next control block, and if EOM = 1, the link control is terminated in the current state. . If ACK = 1, it means that data reception error or received data could not be processed. When the acknowledgment bit (ACK) from the receiver is not detected, the transmitting side retransmits the same data after a predetermined time (e.g., 1000 msec), and the acknowledgment bit (ACK) is continuously transmitted a predetermined number of times (for example, 5 times) If not detected, the communication ends.

As a countermeasure for preventing a data collision caused by the television receiver 10 and the VR 20 simultaneously occupying the control line CTL, the control line CTL is continuously 'high' for a period of at least 3 bits. Check whether to maintain (standby state). If the check indicates that the device remains 'high' for more than 3 bits, the new link master can occupy its control line (CTL) and send a new message.

If the control line (CTL) is occupied by the current link master and the control line (CTL) remains inactive for 7 bits or more, the new link master can occupy the control line (CTL) and transmit a new message. Will be.

If the control line CTL remains inactive for more than 9 bits after a message has already been transmitted through the control line CTL by the current link master, the link master continues to occupy the control line CTL. You will be able to send messages.

If the control line (CTL) remains inactive for 5 bits or more after one frame of message (Frame_1) is transmitted through the control line (CTL) by the current link master, the link master is the control line (CTL). Can continue to occupy and transmit the message Frame_1 again.

Meanwhile, FIG. 3 exemplarily illustrates the format and timing of signal bits transmitted through the control line CTL. Here, (a) is a start bit (S), (b) is a logic '0', (c) is a logic '1'. 4 exemplarily shows specifications of parameters constituting each symbol in FIG. 3.

In the above description, the link master means the TV microcomputer 11 or the VCD microcomputer 21, and the slave also means the TV microcomputer 11 or the VCD microcomputer 21. That is, the link master and the slave are not fixed to the TV microcomputer 11 or the VCD microcomputer 21, but can be changed according to a given situation.

When the play-related key is inputted to the user by the user, the mode is automatically switched to perform the function while communicating the physical layer frame of the above format. Therefore, the user does not need to operate many keys as in the prior art. Do not. That is, when the link reproduction request is made, the state of the television receiver 10 and VRC 20 is checked, and if conditions are satisfied, the link reproduction command is output to the deck system.

To this end, the microcomputer 11 of the television receiver 10 manages information for displaying the functions of the VRC 20 using the first area 12A of the memory 12, and the second area 12B. It manages its own status information or information to be transmitted using the third and the third area (12C), and manages the status information, slave address (SA), etc. of the V-C20 (20). In addition, since the microcomputer 11 of the television receiver 10 generates its own on-screen information to notify the user through the on-screen unit 13, it is not necessary to provide a separate on-screen unit in the VRC. .

Hereinafter, the regeneration method according to the present invention will be described in more detail.

First, as shown in FIG. 5A, when a play-related key is input to the VRC 20 through the key input unit, the microcomputer 21 for VLC checks the key input and then links the control line through the control line CTL as described above. Attempt to connect. When the link connection is completed, the VRC microcomputer 21 requests the TV microcomputer 11 of the television receiver 10 to transmit status information, which is the power of the TV receiver 10. On-off information, channel number, link channel band and the like.

After that, the microcomputer 21 for V-Cal checks the state information of the television receiver 10 and transmits the power-on command of the television receiver through the path when it is determined to be in the power-off state.

When the power of the television receiver 10 is turned on in this way, as shown in FIG. 5B, the TV receiver 10 is checked to be switched to a preset link channel (eg, CH3 or CH4). If not, the transfer request command will be sent. Accordingly, the TV microcomputer 11 switches the current channel to the preset link channel according to the switching request command.

Thereafter, as shown in FIG. 5C, the TV microcomputer 11 of the television receiver 10, which is a local device, issues a status information transmission request command to the VR microcomputer 21 through the control line CTL. This status information means channel number, deck status, tape presence, tap presence, tape speed, and the like.

Accordingly, the TV microcomputer 11 analyzes the state data transmitted from the VRC microcomputer 21 through the control line CTL to determine whether the required link reproduction condition is established.

If it is found that the required link reproduction condition is not satisfied, an on-screen unit 13 is used to display a warning message on the screen. However, if it is found that the link reproducing condition is established, a link reproducing on command is outputted to the VRC microcomputer 21, so that the link reproducing function is performed under the control of the VRC microcomputer 21. .

In other words, the video signal reproduced and output from the VR 20 is supplied to the television receiver 10 via a link channel (eg, CH3 or CH4) of the television receiver 10 via a predetermined transmission line and displayed. .

On the other hand, the link interface data for performing the link playback function as described above is as follows.

6 illustrates a format of a control command CMD for controlling a local device.

Here, the control command CMD = ″ 00000001 ″ / ″ 00000010 ″ performs a power on / off operation of the local device. CMD = ″ 00000011 ″ is a link reproducing on command outputted to the local device side to perform a link reproducing operation, and CMD = ″ 00000100 ″ is a power off command of the local device performing a link reproducing operation.

In addition, CMD = ″ 00000101 ″ is data transmitted to the television receiver 10 in order to perform a link reproducing operation. The VRC 20 receives the current TV channel information after transmitting this data to perform a link reproducing operation. To perform.

CMD = ″ 00000111 ″ is data for switching the video output of the local device. CMD = " 00001001 " is data for controlling a link interface bus line, that is, a control line CTL, for link control with a local device connected to the control line CTL together with the VRC. Finally, CMD = ″ 00001010 ″ is data for stopping the operation of the local device in the link control error state or the alarm state.

FIG. 7 shows the format of a control command CMD for requesting data from the other side, and FIG. 8 shows the format of a response command for a data request command as shown in FIG. Here, it can be seen that the fifth bit value from the least significant bit LSB is all set to ″ 1 ″, which means it is a request command.

The control command CMD = ″ 00010001 ″ is a general call command for checking the link interface status. CMD = ″ 00010010 ″ is a command for checking the status of the current local device. CMD = ″ 00010011 ″ is a command for checking interface link channel information.

CMD = ″ 00010101 ″ is a command for requesting download to check the preset channel information of the master device on the local device side. CMD = ″ 00010110 ″ is a command for requesting the count value of VRC 20 which is a local device, and CMD = ″ 00010111 ″ is a command for requesting the remaining tape value of VLC 20 which is a local device.

The start bit S is a bit for confirming the ATV link format, which is processed by the timing check of the waveform as shown in FIG. In addition, the application identifier A. ID is a three mode bit capable of confirming ATV link version — 01 (ATV Link Ver — 01), which is recognized by a timing check as shown in FIG.

FIG. 10A illustrates an example of definition of a link master LM among components of the header block, and FIG. 10B illustrates an example of defining a slave address SA.

FIG. 11A illustrates an example of the definition of the extended command ECT among the elements of the command block, 11B illustrates an example of the definition of the control command CMD, and 11c illustrates an example of the definition of the message end bit EOM. It is shown.

12A to 12I show examples of defining data operation blocks.

FIG. 12A relates to link regeneration on, and VRL 20 as a local device performs a link regeneration operation only in a STOP state regardless of power on / off. However, when there is no data block, the VRC 20 performs a normal play operation under the current channel and tape speed conditions.

12B relates to image on, which is an optional feature for turning on video and audio at the local device in response to a video source on the transmitting side.

12C relates to a general call response. Local device status information is output in response to a general call command for checking the link interface status on the local device side.

12D relates to a local status information response, which is the current status information of a local device output to perform link playback.

12E relates to link channel information response, and outputs link interface channel state information of master and local devices using the link channel information response.

12F relates to a clock information response, and outputs current date and time information from a local device using the clock information response.

12G relates to a channel preset data response and uses this to output memory preset information of the channel.

FIG. 12H relates to the real time counter response of the VRC 20, and outputs a running direction and a count value of the tape when the VRL 20 is driven.

FIG. 12I relates to the remaining tape response of the VRT 20, and outputs the remaining value of the tape according to the running speed of the tape when the VRL 20 is driven.

13A to 13N illustrate examples of defining a common data operation block.

FIG. 13A shows an example of definition of ″ year ″ data of 6 bits, FIG. 13B shows an example of definition of ″ month ″ data of 4 bits, and FIG. 13C shows ″ day of 5 bits. ) ″ Here is an example of data definition.

13D shows an example of definition of ″ hour ″ data consisting of 5 bits, and FIG. 13E shows an example of definition of ″ minute ″ and ″ second ″ data consisting of 6 bits. 13F shows an example of definition of ″ week ″ data consisting of 3 bits.

Fig. 13G shows an example of definition of ″ power state ″ data consisting of 1 bit, and Fig. 13H shows an example of definition of ″ channel band ″ and ″ channel number ″ data consisting of 7 bits. Fig. 13I shows an example of definition of the " state " data of the VRC 20 composed of 6 bits.

13J shows an example of definition of ″ audio status information ″ data composed of 4 bits. Fig. 13K shows an example of definition of ″ tuner / deck operation mode (EE / VV) ″ data composed of 1 bit, and Fig. 13L shows an example of definition of ″ DV / V-CAL mode ″ data composed of 1 bit. FIG. 13M shows an example of definition of ″ tape speed ″ data composed of 2 bits, and FIG. 13N shows an example of definition of ″ tape and safety tap ″ data composed of 2 bits.

As described in detail above, the present invention provides a minimum key input from a user when performing a playback function in a link system of a V-Cal and a television receiver, and communicates with the other video device periods through a control line for the rest. By grasping the state of each other and automatically switching to the required mode, there is an effect that can ensure the maximum convenience in use.

Claims (8)

Requesting transmission of status information to a television receiver through a control line when a playback-related key is input to the V-Cal, then identifying the status information transmitted therefrom and transmitting a power-on command to the television receiver if necessary; A second step of checking whether the television receiver is switched to a preset link channel and transmitting a switching command if it is determined that the television receiver is not switched; And a third process of analyzing the state data of the V-CAL and performing a reproducing operation to display the output video and audio signals when the required link reproducing condition is established. The method of claim 1, wherein the first step comprises: a first step of attempting a communication connection with a television receiver via a control line when a playback-related key is input to a V-C; Requesting status information from the television receiver through the control line; And a third step of analyzing the state information transmitted from said television receiver and transmitting a power-on command when it is not in a power-on state. The method of claim 1 or 2, wherein the status information includes power on / off, channel number, channel band, deck status, and tape status of a television receiver. 2. The method of claim 1, further comprising: a first step of checking a current channel of the television receiver by switching to a link communication enabled state with the television receiver through a control line when a play-related key is input to the V-CAL; If it is determined that the current channel of the television receiver is not a predetermined link channel, a switching command is transmitted, whereby the TV receiver switches to the link channel. How to play. The method of claim 1, wherein the third process comprises: a first step of requesting transmission of status information through a control line and analyzing the response data; A second step of confirming whether a link reproduction condition is satisfied as a result of the analysis; When the link playback condition is established as a result of the checking, a third step of transmitting the link playback on command to the deck system of the BCAL and displaying the video signal reproduced and outputted is performed by the third step. Way. The method of claim 1 or 5, wherein the link playback is an immediate playback. The method of claim 1, wherein the communication frame between the V-Cal through the control line and the television receiver comprises a start sequence, a header block, a command block, and a plurality of data blocks. The method of claim 1, wherein the link reproducing operation of the third process is performed only in a stopped state regardless of power on / off.