JPH0436610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for forming switching signals in a radio or image receiving device and to a receiving device used to carry out this method.

(Prior Art and Problems to be Solved by the Invention) Currently, radio and television stations send their messages to radio or image receiving devices, such as the destination transmitting station, the program that the transmitting station is broadcasting, the program that is currently being broadcast, and the information being received. It incorporates a series of identifying data words that identify the message being received by the device. In particular, on the basis of a message identification data word associated with a particular message and transmitted simultaneously with the message, a receiving device tuned to the associated transmitting station recognizes this message and stores it in the program request storage of the receiving device. The program request can be compared with the previously programmed program request, and the corresponding switching command programmed in advance can be executed according to the comparison result.

A radio broadcasting system is known from German Patent Application No. 2 614 188, which is configured such that, at the same time as a message is transmitted by a transmitting station, a message identification signal is also transmitted which identifies this transmitted message and includes an identification data word which is evaluated in a receiving device. It is.
An evaluation circuit in the receiving device receives the transmitted message identification data word, which is stored in a program request storage also in the receiving device.
The transmitted message is compared with an identification data word identifying it as a message preselected by the user, and if there is a match, a switching signal is formed which causes the receiving device to determine the corresponding identification data word while the message identification data word is being received. It remains ready to receive transmitted messages.

However, even if the frame word is correctly verified, the transmitted message identification data word may not necessarily be output from the data separation circuit in a form that is clear enough to be compared. Therefore, there is a possibility that a part of the message from the other party's transmitting station will not be confirmed, making it impossible to reproduce it by the receiving device, or, worse, to record it by the video recorder receiving device.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to propose a method for forming a switching signal which activates the switching/display function of a receiving device in dependence on the identification data word of a received message, regardless of reception disturbances on the receiving device side.

(Means for solving the problem) In the basic form of the present invention, this object is achieved by the method described in claim 1.

In the method of the invention, the message identification data word is repeated many times with high accuracy and is only evaluated if it is determined to be verifiable. The time required to check what can be confirmed with high accuracy is so short that the user of the device will not notice it even if the reception conditions are poor. Furthermore, with the method of the invention, the cost of circuitry to be incorporated into the receiving device for carrying out the method is negligible.

Claim 2 describes a particularly preferred embodiment in which the check cycle is divided into two check stages. The comparison data word obtained in the first check stage is proven to be recognizable with a very high degree of certainty in both check stages, and is therefore very suitable for output to the subsequent data evaluation circuit.

The present invention is further improved by the features set forth in claim 3. If a message identification signal reception failure persists for a long period of time, the receiving device determines the resulting lack of a matching signal for a certain period of time as the end of identification signal transmission corresponding to the received message. When the constituent features of claim 3 are adopted, the switching signal is formed only after the start of the second message is confirmed when two consecutive messages are switched,
It will be released. Therefore, for example, if the first message or its identification signal is temporarily interrupted even though the first message has not yet been completed, there is no possibility that the reception of this message will be stopped. If stopped, the remaining portion of the first message would result in being dropped.

Claim 4 provides, as a further form of the invention, a device for use in carrying out the method according to the invention, characterized in that the identification data word separated in a receiving device is checked by the method according to the invention. , a radio or image receiving device is stored that is input to a data evaluation circuit in the receiving device only after it has been determined that it can be recognized with a high degree of accuracy. The constituent elements of the receiving device recited in claim 4 can be implemented in the circuit section of a microprocessor, so if a microprocessor is already used in the receiving device, it may be added. There is no or very little circuit cost involved.

If the constituent elements of claim 5 are adopted, the message identification signal will be transmitted only when the message identification signal first appears during the transmission of the received message, or when the switching of the message identification signal to be transmitted is confirmed by the receiving device. , a preferred embodiment of a radio or image receiving device is obtained which allows passage of a switching signal which activates the switching/display function of the receiving device.

Like the data evaluation circuit, the circuit recited in claim 5 can also be implemented as part of a microprocessor circuit, so that in this case no additional circuit costs are required.

(Example) Hereinafter, the present invention will be described in detail based on preferred examples shown in the accompanying drawings.

FIG. 1 shows an image receiving apparatus including a high frequency circuit 1 and a video signal processing circuit 2. As shown in FIG. The high frequency circuit includes a receiving circuit, a tuning circuit, and a demodulation circuit for demodulating the transmitted wave received by the antenna 3, and the high frequency circuit 1 is tuned to the transmitted wave. The high frequency circuit 1 outputs a video signal at an output 4, which is converted in a video signal processing circuit 2 into a picture tube control signal or a control/storage signal for a video tape 5 of a VTR. A data separation circuit 6 is also connected to the output 4 of the high frequency circuit 1. This data separation circuit separates a message identification signal consisting of a mixed video signal from a certain number of image lines generated in the receiving device and counted by synchronization pulses transmitted by transmission line 7. This message identification signal is transmitted together with the message transmission from the other transmitting station, and is used to identify or identify the message transmitted and received by the receiving device. In particular, the message identification data word of this message identification signal is for identifying the message to be transmitted and is transferred from the data output 8 of the data separation circuit 6 to the data input 9 of the receiver data evaluation circuit 10 for evaluation. .

The data evaluation circuit 10 compares the message identification data word DW1 _s present at its input 9 with the stored data word input to the data evaluation circuit and converts the comparison result into a switching/display command, which command For example, it reaches the video signal processing circuit 2 via the control circuit 11, where it activates the associated switching/display operations. However, if such a message identification data word DW1 _S to the data evaluation circuit is unclear, which is likely to occur when the reception condition is poor or there is a reception failure, the data evaluation circuit 10 will not be able to evaluate the message identification data word DW1S. Errors occur or no evaluation is performed at all. As a result, as will be described in detail later, part of the message is lost in the receiving device.

In order to avoid such omissions, the message identification data word is inserted between the outputs 8, 12 of the data separation circuit 6 and the inputs 9, 13 of the data evaluation circuit 10 only when the message identification data word is correctly verified. A check circuit 14 is inserted to transfer data to the circuit. In the check circuit, one comparator input 16 is connected to the data separation circuit 6.
, and the other comparator input 17 is connected to the data output 18 of the storage circuit 19 . The data input 20 of the storage circuit is also connected to the data output 8 of the data separation circuit 6. The two circuits 15, 19 are controlled by a program counter 21 whose control input 22 is connected to the control output 12 of the data separation circuit 6 and which is advanced step by step by the control signal of the data separation circuit. .

The check of the clarity of the message identification data word DW1 appearing at the data output 8 of the data separation circuit 6 by means of the circuits 15, 20, 21 and the counter circuit 24 connected to the coincidence output 23 of the comparator circuit 15 is shown in FIG. Pulse/phase diagram a~
A group will be described below with reference to i. Diagram a in Figure 2
2 shows the message identification data words DW1 sequentially outputted from the data separation circuit 6 in order to identify consecutive messages, and in FIG. Abbreviated. Figure c shows the storage command as signal 29, Figure d shows the comparator command as signal 30, Figure e
The coincidence signal 31 from the coincidence output 23 of the comparator circuit is schematically shown in FIG. 2, and the reset signal SRS is schematically shown in FIG. Finally, Figure h shows the counter circuit 2
4 count changes are shown with corresponding blocks.

Before starting the check, test (check)
The circuit 14 has been set to an initial state by a reset signal SRS, in which the program counter is at program step p0 (FIG. a). A continuous message is characterized, for example, by a continuous transmission of message identification data words DW1.
First message identification data word received
When the control signal corresponding to _DW11 reaches the check circuit 14 in the initial state, this control signal switches the program counter to program step p1,
At this program step, the program counter generates a storage command 19c on the transmission line 25 leading to the data storage 19. As a result, the message identification data word DW1 ₁ is stored in the data storage device 19 and the data output 1 of the data storage device
8 to a data input 17 of a comparator circuit 15. Next message identification data word
The control signal at _DW12 switches the program counter to program step p2, in which the program counter switches to program step p2.
Similar to the step, a comparator command ₃₀ as shown in FIG. Activates a comparison with the message identification data word _DW1-2 . In the illustrated embodiment, no match is recognized by the comparator circuit; instead, a mismatch signal shown in FIG. resets the check circuit 14 to the initial state as a reset signal SRS via the gate circuit 28 controlled by the program step p2 of the program counter 21. As a result, program counter 21 and counter circuit 24 are reset to their initial states and data storage device 19 is cleared.

The next message identification data word _WD1-3 is also stored in the data storage device 19 in a manner similar to that described above and is compared in the comparator circuit 15 with the next message identification data word _DW1-4 .
Since a match exists between both message identification data words being compared, the comparator circuit generates a match signal 31 at match output 23, which via circuit 32 sets counter circuit 24 to count one. Next message identification data word
The control signal of DW1 ₅ sets the program counter 21 to program step p3, in which step the program counter 21 issues a comparator command (signal 30) but does not conduct the gate circuit 28 for the reset signal. .
The same applies to subsequent program steps p4 to p10. Therefore, in these program steps, it is not possible to set the check circuit to its initial state by means of the discrepancy signal 27 appearing at the output 26 of the comparator circuit. It is stored in the data storage device 19. If the message identification data word DW1 ₅ and subsequent message identification data words are compared with the message identification data word DW1 ₄ and generate a match signal 31 based on the comparison, then the counter circuit 24 counts up the final count 26.
The counter circuit 24 is advanced one count at a time until reaching , and at the final count an output signal 33, shown as a clear signal 33 in Figure i, is generated. With this clear signal, the message identification data word _DW1-3 , which is stored in the data storage device 19 as a stored data word _DW1-5 , is admitted to the data input 9 of the data evaluation circuit 10. Also,
The clear signal 33 stops the program counter from advancing, which is represented in FIG. 1 by a transmission line 34 leading to a gate circuit 35.
After the check circuit 14 is reset to its initial state, a new check cycle begins.

The number of program steps of the program counter 21 in which the comparator command is generated is larger than the count number of the counter circuit 24,
The process ends at step p11, in which the program counter generates a reset signal SRS for resetting the check circuit 14 to its initial state. The number of program steps between the first program step and the last program step is determined by a second check in which the separated message identification data word is compared with the message identification data word _DW1-3 , which is fully recognizable as the comparison data word _DW1-5 . The steps are set in such a way that there is a high probability that the stored identification data word will be output in a relatively clearly recognizable form even in the presence of poor reception conditions or major disturbances in the reception channel.
Therefore, a clearly recognizable identification data word is detected in the first check phase, when the gate 28 of the discrepancy signal 29 which resets the check circuit 14 is open, and its reliability is additionally checked in the second check phase. Ru. Experience has shown that the number of program steps between the first and last program step of program counter 21 is approximately twice the number of counts in counter circuit 24 until clear signal 33 is generated. Particularly preferred in light of. The identification data word _DW1-5 stored in the data storage device 19 is recognized by incrementing the program counter 21 by one or two program steps corresponding to the first check stage of the check cycle of the check circuit 14. can be further ensured.

However, the absence of the message identification data word DW1 _s at the output of the check circuit 14 does not necessarily indicate the end of the message S1;
This can occur, for example, if the transmission of the message identification signal or the transmission of the message is interrupted for a period longer than the predetermined check cycle time. As a result, the message identification data word DW _s of the message identification signal allowed to pass by the check circuit 14 is connected to the data output 40 of the program request storage 41 in the evaluation circuit 10 to the second comparator input 39. A first comparator input 9 of a comparator circuit 38 is reached. In the illustrated embodiment, the comparator circuit 38 includes a match output 42 and a mismatch output 43, and when a match or mismatch is detected in the comparison of the data at the comparator inputs 9 and 39 of the comparator circuit, a match signal is provided at said outputs 42, 43. 59 or a mismatch signal 60, respectively. In the case of a temporary signal, the state storage device in the form of a bistable multivibrator 44 switches from the reset state RS to the reset state S. In the set state S, the bistable multivibrator 44 conducts the gate circuit 45 of the mismatch signal, so that in this case the mismatch signal at the mismatch output 43 of the comparison circuit appears at the output 46 of the gate circuit as a switching signal.

The illustrated image receiving device has a second comparator input 4.
9 includes a crack signal generator 47 connected to a clock comparator circuit 48 connected to a clock data output 50 of program request storage 41. Two coincidence outputs 51 and 52 of the comparator circuit 48 control an operating state storage device 55 via two gate circuits 53 and 54, respectively, when a coincidence with the start time T _A and a coincidence with the end time T _E are detected. However, this operating state storage device is connected to the image processing unit 2 via the transmission line 11 in the set state S.
The image processing section 2 is switched into an active state during the connection time with this signal.

Next, the operation of the data evaluation circuit will be explained with reference to diagrams a to j of FIG. Figure a shows a program request stored in the program request storage 41 as a chronological diagram comprising an identification data word DW1 _p , a start time _TA and an end time _TE . In a particularly preferred embodiment, the starting time T _A is the message identification data word.
Concurrent with DW1 _p or part thereof. Fig. b shows a message from a transmitting station to which the receiving device is tuned, and Fig. c shows a message identification signal transmitted together with the message as a time diagram. Figure d shows the coincidence signal 5 for the intended start time T _A of the program request shown in a.
7 and a coincidence signal 58 for the intended end time T _E . Figures e and f show the match signal 59 and the mismatch signal 60 of the comparator circuit 38, and Figures g and h show the set state S of the two state storage devices 44, 55.
are shown as time-lapse diagrams.

In the illustrated embodiment, the message S1 of the transmitting station, which is in a synchronized relationship with the receiving device and which is stored in the program request storage 11 as a program request DW1 _p , is initially transmitted without the message identification data word DW1 _s . It is assumed that Therefore, when the clock signal generator 47 coincides in time with the output time T _A from the program request storage 41, a coincidence is detected via the operating state storage 55 which is reset to the set state S by the coincidence signal 57. A signal 57 activates the image processing section. When the first identification data word DW1 ₁ identifying the message S1 is transmitted from the transmitting station, separated by the data separation circuit 6 and outputted in a reliably distinguishable form by the check circuit 14 for comparison, the comparator Circuit 38 compares the identification data word DW1 _p of the program request and activates bistable state storage 44 when a match is confirmed by match signal 59 appearing at match output 42 of the comparator circuit. This state storage device disables the output side gate circuits 53 and 54 of the clock comparator circuit 48, which are controlled to be conductive in the reset state RS, to disable the output of the comparator circuit 48. Even in the event of an interruption of the message identification signal, for example due to a fault, which is represented by a _gap 61 in FIG. does not work. Identification data word DW1 _p of the request program by the transmitting station
identification data word of message S2 that does not match
DW2 _s is transmitted, and this is supplied to the comparator input 39 of the comparator circuit 38. As a result of the comparison, the comparator circuit 38 detects a mismatch and outputs a mismatch signal 60 at the mismatch output 43, which is operated via the gate circuit 45. State storage device 55
This storage device 55 is reset to the reset state only when the reset input RS is reached. As a result, the audio switching signal 62 at the output 63 of the operating state storage device 55 is stopped, the image processing section 2 becomes inactive, and the program request in the program request storage device 41 supplied for comparison is erased. Ru. In the reset state RS of the operating state memory 55, the reset input of the bistable state memory 44 is supplied with a reset pulse 66 via the pulse generator, which resets the bistable state memory 44 to the reset state RS; In this process, the comparator circuit 38
The non-coincidence output 43 is locked via the gate circuit 54. Therefore, the first discrepancy signal 59 of the comparator circuit 38 forms a switching signal for stopping the operation of the image processing section 2. This switching signal is such that a match signal is formed in the first comparison stage, the result of this comparison is stored, a mismatch is detected in a subsequent comparison, and a mismatch signal is generated only if a match has previously been detected and stored. It is formed through the process of forming a switching signal.

[Brief explanation of drawings]

1 is a block diagram of an image receiving device including a check circuit for checking the clarity of separated identification data words; FIG. 2 is a pulse/state diagram showing the operation of the check circuit of the receiving device shown in FIG. a~
FIG. 3 is a diagram showing switching signal forming processes a to i of the receiving apparatus shown in FIG. 1. 1...High frequency circuit, 2...Video signal processing circuit, 3...Antenna, 6...Data separation circuit, 1
0...Data evaluation circuit, 14...Check circuit,
15, 38, 48... comparator circuit, 19...
...Memory circuit, 21...Program selector, 2
4... Counter circuit, 28, 35, 45... Gate circuit, 44... Bistable multivibrator.

Claims (1)

[Claims] 1. A method for forming a switching signal from a message identification data word (DWI ₁ ...) for message identification received in a radio or image signal receiving device, wherein said message identification is - an identification of the message transmission is transmitted by a transmitter to which the receiving device is tuned to identify the message at the same time as the transmission of the message; - and received at the receiving device which is tuned to the transmitter; No - the message identification is separated from the message signal and - the message identification data word (DW1 _s ) is compared with the identification data word (DW1 _{p .} . . ) stored in the program request storage 41 to find a match 27 The message identification is always provided such that each of the identification data words is associated with a selected message read signal to identify the selected message read signal and program request storage. A method of forming a switching signal according to the invention, wherein each of the identification data words is evaluated and used to form a switching signal to trigger a switching and display function in a receiving device. - the first message identification data word in which the first separated message identification data word (DW1 ₃ ) is stored during the test cycle; - the first message identification data word in which subsequently the separated message identification data word (DW1 ₄ ...) is stored; (DW1 ₃ ); - the stored first message identification data word (DW1 ₃ ″ or subsequent message identification data) which is the same as said first message identification data word and is used for comparison purposes in the test cycle; Words are allowed to pass for evaluation and for the triggering of switching and display functions depending on the message identification data word (DW1 ₃ as DW1 _s ) during the course of the test cycle, and the respective comparison or comparison. The dominant part of the number of message identification data words (DW1 ₄ ... DW1 ₁₁ ) used for the stored message data words and the message identification data words used successively for comparison 2. A method for forming a switching signal characterized in that in the first stage of a test cycle an initially separated and stored message identification data word is followed by a separated message identification data word ( DW1 ₄ )
are compared a predetermined number of times, and if all comparisons result in a match 31 with the first stored message identification data word, the first stored message identification data word (DW1 ₃ ) is tested for a test cycle. A predetermined number of message identification data words (DW1 ₅ ...
...) with the comparison data word (DW1 ₃ ) and if at least a given number of matches Z6 are detected, the first message identification data word (DW1 ₃ ) stored or subjected to comparison in the test cycle 2. A method as claimed in claim 1, characterized in that the next message identification data word is allowed through for evaluation. 3. Compare the message identification data word (DW2 _s ) identifying the separated transmitted message (S2) with the identification data word (DW1 _p ) identifying the desired message (S1) stored in the program request storage 11; and generates a mismatch signal 30 if no match is detected between the plane identification data words, and a message identification data word (DW1 _s ) identifying the other separated transmitted message (S1);
characterized in that the mismatch signal forms a switching signal which activates a switching/indication function if a match is detected in the previous comparison of the program request with a stored comparison-ready identification data word ( _DW1p ). A method according to claim 1 or 2. 4. A method of forming a switching signal from a message identification data word (DWI ₁ ...) for identifying a message received by a radio or image signal receiving device, wherein the message identification is performed by tuning one of the receiving devices. an identification of the message transmission is transmitted from a transmitter at the same time as the transmission of the message to identify the message; - and upon receipt at a receiver tuned to the transmitter; is separated from the message signal and -- the message identification data word (DW1 _s ) is compared with the identification data word (DW1 _P . . . ) stored in the program request storage 41 to confirm a match 27; Said message identification is always provided, wherein each of said identification data words is associated with a selected message read signal, said selected message read signal is identified and stored in said program request storage, said identification data word is In the method of forming a switching signal of the invention, each of the data words is adapted to be evaluated and used to form a switching signal to activate a switching action and an indication function in a receiving device. A test circuit 14 connected between the data output terminal 8 and the data evaluation circuit 10 is activated, the test circuit being a data storage device 19 for storing a message identification data word (DW1 ₃ ), the data storage device 19 being connected between the data output terminal 8 and the data evaluation circuit 10; The device is connected to the data output of the isolation circuit by a comparator input 16 on the one hand and by a comparator input 16 on the other hand.
7 connected to the data output 18 of the data storage device 19; a program counter 21 for controlling the data storage device and the comparator circuit; and a counter circuit for counting coincidence signals (K ₀ ). 24, the counter circuit being connected to the coincidence output 23 of the comparator circuit 15, each transmitter identification arriving at the data output of the data separation circuit 15; The data word for the program counter connected to the data separation circuit is used for the next program stage (p1...)
and the output signal of the first program stage (p1) of the program counter is a read command 29 for the transmitter identification data storage 19.
and the output signal of a certain number of program stages (p2) of the first group following the first program stage (p1) triggers a comparison process of the connected comparator circuit. Not only the comparator instruction 30 for the comparator circuit 15, but also each time the comparator circuit checks an anti-coincidence during the comparison process and generates an anti-coincidence signal (AK ₀ ), returns the test circuit to its initial state. In this case, the output signal of the program stage of the second group (p3...p10) following the first group is
the number of steps in the group of is greater than the sum of the prespecified number (Z6) of coefficient steps of the counter circuit counting matches plus the number of program steps of the first group; The output signal of the program stage (p11) which is the only comparator signal for P15 and which follows the program stage of the second group is:
a reset signal (SRS) for resetting the test circuit to its initial state;
In a connected data evaluation circuit, the message identification data word (DW1) applied to the data input 9 of the data evaluation circuit 10;
A method for forming a switching signal, characterized in that the signal 33 is for allowing a data process to trigger said evaluation of a switching signal. 5 a data separation circuit, a data evaluation circuit connected to its output, and a program request storage device connected to a comparator circuit in the data evaluation circuit, wherein the comparator circuit 38 of the data evaluation circuit 10 detects the transmitted message (S1 ) from the output 18 of the test circuit 14 to the first comparator input 9 of the comparator circuit, and the program request _storage 41
The identification data word (DW1 _p ) is input to the second comparator input 39 of the comparator circuit from and stored.
It generates a match signal at its output 42 when it detects a match with the message identification data word (DW2 S ) coming from the test circuit 14 to identify the transmitted message (S2) and the identification data word (DW2 _S ) appearing at the second comparator input. When a mismatch is detected between DW1 _p ), a mismatch signal 30 different from the match signal is generated at its output, and the bistable multivibrator 44 whose match signal is in the reset state (RS) is switched to the set state (S). The bistable multivibrator in the set state (S) conducts the gate circuit 45, and in this conductive state, the gate circuit 45 outputs the mismatch signal supplied to its input as a switching signal 46.
A device for forming a switching signal in a radio or image signal receiving device, characterized in that the device is adapted to transmit a switching signal to a radio or image signal receiving device.