JPH02183697A - Remote control reception circuit - Google Patents

Abstract

PURPOSE:To attain decision processing for a remote control signal with 2 kinds or over of formats by providing a function detecting a leader of plural formats and discriminating a format of an input signal. CONSTITUTION:A remote control signal is inputted from a remote control input terminal 5 and an edge detection circuit 6 detects the edge and a sampling counter 7 uses a sampling clock so as to count the interval between the edges of the remote control signal. When the count corresponds to a length of a leader of a specific format, a leader detection decision circuit 11 outputs a signal corresponding to the format of the detected leader among leader detection format decision signals 12a, 12b... able to be outputted from the circuit 11 to a control block 1, which initiates the processing of the discrimination result of a data decision circuit 10. Thus, formats of remote control signal of 2 kinds or over are decided thereby applying decision processing to data.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a remote control (hereinafter referred to as remote control) receiving circuit that can judge and process control signals in two or more formats input from the outside. be.

Conventional technology An example of a conventional remote control receiving circuit is shown in FIG.

The clock outputted from the control block 1 is frequency-divided by a frequency dividing circuit 3 via a signal line 2, and a sampling clock is outputted to a signal line 4. Edges of the remote control signal inputted from the remote control input terminal 5 are detected by an edge detection circuit 6 and input to a sampling carantuff. The sampling counter 7 counts the edge interval of the remote control input signal using the sampling clock. Based on the count, the leader detection circuit 8 determines whether the signal is a leader or not, and if it is a leader, outputs a leader detection signal to the signal line 9. The data determination circuit 10 is a circuit that determines that if the count of the sampling counter 7 is greater than or equal to a certain value n, it is 1'', and if it is less than n, it is determined to be 0''. This value n is
It is a positive integer such that 1' and O° can be determined based on the lengths of data '1' and data '0' of the received format signal. Upon receiving the reader detection signal from the signal line 9, the control block 1 processes the determination result of the data determination circuit 10.

Problems to be Solved by the Invention However, the conventional configuration described above has the problem that it is only possible to detect a reader with a signal in one specific format, and it is not possible to judge and process remote control signals in two or more formats. be.

SUMMARY OF THE INVENTION An object of the present invention is to configure a remote control receiving circuit capable of determining and processing remote control signals of two or more formats.

Means for Solving the Problems In order to solve the above problems, the present invention has a function of detecting readers of a plurality of formats and determining the format of an input signal, and processes data according to the determined format. This is a remote control receiving circuit.

Function: With this configuration, it is possible to judge and process remote control signals in two or more formats.

Example A first embodiment of the present invention will be described.

This embodiment is for configuring a remote control circuit that detects a reader of a remote control input signal and determines the format of the input signal.

A block diagram of the first embodiment is shown in FIG.

A clock output from the control block 1 passes through a signal line 2, is frequency-divided by a frequency divider circuit 3, and outputs a sampling clock as a signal n4. A remote control signal is inputted from a remote controller input terminal 5, and an edge is detected by an edge detection circuit 6. The sampling counter 7 counts the interval between edges of the remote control signal using a sampling clock.

When the counted number corresponds to the length of the leader of a specific format, the leader detection format judgment signals 12a and 12b are outputted from the reader detection judgment circuit 11.
..., a signal 12i corresponding to the format of the detected reader is output and transmitted to the control block 1.

The data determination circuit 10 is a circuit that determines that if the count of the sampling counter 7 between the edges of the remote control input signal is greater than or equal to a certain integer value n, it is 1', and if it is less than n, it is determined to be O'.

When the control block 1 receives the reader detection format determination signal, it starts processing the determination result of the data determination circuit 10.

With this configuration, the reader of the remote control input signal can be detected and the format of the input signal can be determined.

Next, a second example will be described.

This is for controlling the frequency of the sample clock of the sampling counter based on the output from the reader detection/judgment circuit or the one-go detection format judgment signal.

A block diagram of the second embodiment is shown in FIG.

The clock output from the control block 1 enters the frequency dividing circuit 13a via the signal line 2. The output signal is signal line 1
4a, one or more frequency dividing circuits 13b, 13C.
It is possible to generate clocks of different frequencies by the frequency divider circuit that is sequentially input to and passed through once. These clocks 14a.

14b, 14G, . . . are input to the sampling clock selection circuit 15. In the initial state, the clock with the highest frequency of the signal line 14a is set to be selected as the sampling clock.

"When a remote control signal is input from the remote control input terminal 5,
The signal is inputted to the sampling counter 7 via the edge detection circuit 6. Count the edge interval of the remote control signal using the sampling clock.

When the count corresponds to the length of the reader of a specific format, a reader detection format determination signal that can be output from the reader detection determination circuit 11 is transmitted to each signal line 12.
a, 12b, . The reader detection format determination signal is also input to the sampling clock selection circuit 15, which selects a clock suitable for data determination of the detected format as the sampling clock.

The data determination circuit 10 determines remote control data based on the count using the selected clock as the sampling clock.

After processing the data, reset the sampling clock to the highest frequency clock and wait for reader input again.

With this configuration, it is possible to determine the format of the input signal and to perform data determination using a sampling clock corresponding to the format.

A third example will be described.

This has a plurality of data determination circuits, and selects the data circuit to be processed based on a reader detection format determination signal output from the reader detection determination circuit.

A block diagram of the third embodiment is shown in FIG.

A clock 2 outputted from a control block 1 is input to a frequency dividing circuit 3, and a sampling clock is outputted to a signal line 4. Edges of the remote control signal inputted from the remote control input terminal 5 are detected by an edge detection circuit 6. The sampling counter 7 counts the edge interval of the remote control signal using the sampling clock from the signal line 4.

When the counted number corresponds to the length of the reader of the specific format, the reader detection judgment circuit 11 sends the signal line 12
Among the reader detection format determination signals that can be output to a, 12b, . . . , a signal 12e corresponding to the format of the detected reader is output, and the control block 1
It is transmitted to

The data determination circuits 16a, 16b, . . . set different boundary values for remote control data determination. The reader detection format judgment signal 12e is input to the data selection circuit 17, and the plurality of data judgment circuits 16a, 1
6b..., the data judgment circuit 16m having the boundary value most suitable for the detected format is selected. The control block 1 controls the selected data determination circuit 16.
The determination result of m is processed as remote control data.

With this configuration, it is possible to determine the format of an input signal and to perform data determination using a data determination circuit corresponding to each format.

Effects of the Invention As described above, according to the present invention, it is possible to achieve the excellent effect of being able to discriminate the format of a remote control signal of two or more formats and to perform judgment processing on data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a circuit according to a first embodiment of the present invention, and FIG.
FIG. 3 is a block diagram of a circuit according to a second embodiment of the present invention, FIG. 3 is a block diagram of a circuit according to a third embodiment of the present invention, and FIG. 4 is a block diagram of a conventional remote control receiving circuit. 1... Control block, 2...
Clock signal line, 3. 13 a, 13 b,
13 c=--frequency divider circuit, 4... sampling clock signal line, 5... remote control input terminal, 6
...Edge detection circuit, 7...Sampling counter, 8...Reader detection circuit, 9.
...Reader detection signal line, 10.16a. 16b...Data judgment circuit, 11...
Reader detection judgment circuit, 12a, 12b...Reader detection format judgment signal line, 14a, 14b,
14c...Divided clock signal line, 15...
...Sampling clock selection circuit, 17...
Name of data selection circuit agent: Patent attorney Shigetaka Awano and one other person

Claims (3)

[Claims] (1) A remote control receiving circuit that has a function of detecting the reader of two or more types of control signals with different formats based on the count number of an internally generated sampling clock and determining the format of the input signal. (2) A remote control receiving circuit that also has the function of controlling the frequency of the sampling clock according to the format of the input signal. (3) A remote control receiving circuit that has the function of selecting a specific data judgment circuit from among a plurality of data judgment circuits according to the format of the input signal.