JP2003110437A - Receiving signal processing circuit and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable elimination of noises mixing from a receiving section with a small circuit. SOLUTION: If a remote-control signal is inputted into a light-receiving section 110, upon detecting a header by a header detecting circuit 120, a mask pulse generating circuit 130 generates a mask pulse 13. At this time, even if noises are mixed into an output from a light-receiving section 210, since the noises are masked by the mask pulse 13 in an output from an AND circuit 330, only the signal 32 after being masked being an output from an AND circuit 320 is reflected on an extracted signal of an output from an OR circuit. Here, only the input signal 11 is inputted into the circuit 320 because a mask pulse 23 is not generated, and accordingly, the signal 32 contains only the information of the signal 11. Further, since only the pulse 13 and the signal 11 are inputted into an AND circuit 310, a signal 31 after being masked is masked like the signal 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a received signal processing circuit and method, and more particularly, to a received signal processing circuit and method having a plurality of input sections from a radio signal.

[0002]

2. Description of the Related Art Conventionally, a reception signal processing circuit that receives a radio signal such as a remote control signal by a plurality of receiving units and tries to extract the information (waveform of the signal) of the original wireless signal from the signals received by each of the receiving units. In general, a method of synthesizing the signals received by the respective receiving units using an OR circuit (logical sum circuit) is used.

[0003]

However, in the conventional received signal processing circuit, since only the OR circuit is used for synthesis, one receiving unit receives a radio signal and another receiving unit receives noise. If so, there is a problem in that the synthesized signal including the noise is decoded, and the original wireless signal cannot be faithfully decoded. Further, if a decoder is provided for each receiving unit in order to prevent noise from being mixed in the output signal, there is a problem that the circuit scale becomes large and the circuit becomes expensive.

The present invention has been made in view of such circumstances and has the following objects. A first object is to mask input signals other than those used for output with respect to input signals from a plurality of receivers, so that in a received signal processing circuit and method, input signals other than those used for output This is to ensure that even if noise is mixed in, it can be reliably removed.

A second object is to have a header when the headers are simultaneously detected from the input signals from a plurality of receiving units.
It is an object of the present invention to provide a received signal processing circuit and method capable of reliably and faithfully outputting an original wireless signal with a small circuit configuration by giving priority to two input signals.

[0006]

In order to achieve such an object, the present invention has the following features. According to a first aspect of the present invention, in a received signal processing circuit having a plurality of input means for receiving a signal from each of a plurality of receiving units for receiving one radio signal having a header, an input signal from each of the plurality of input means is provided. Among these, only one input signal having a header is output, and other signals are not output.

According to a second aspect of the present invention, a header detecting means for detecting a header from an input signal input from the input means, and a mask signal for masking an arbitrary signal when the header detecting means detects the header. Of the input signals from the mask generation means and each of the plurality of input means, only the input signal whose header is detected by the header detection means is selected and output, and the mask generation means generates the other input signals. By having a selection / mask means for masking with a mask signal, only one input signal having a header is output, and other signals are not output.

According to a third aspect of the present invention, the selection / mask means combines the input signal of 1 and the mask signal generated by detecting the header from the other input signal by the mask generation means. Section, a second synthesizing section that outputs a 1 input signal that is determined to be prioritized only when a plurality of receiving sections simultaneously receive a 1 wireless signal, and an output signal from the 1 st synthesizing section. And a third synthesizing unit for synthesizing the output signal from the second synthesizing unit.

In a fourth aspect of the invention, the second synthesizing section is
It is a logical product circuit for synthesizing one input signal determined to be prioritized in advance and a mask signal generated by the mask generation means detecting the header from other input signals.

The invention according to claim 5 has a header 1
A method of processing a received signal for an input signal input from each of a plurality of receiving units for receiving a wireless signal, the step of detecting a header from each of the input signals, and a case where a header is detected by the header detection step To
A mask generation process that generates a mask signal that masks an arbitrary signal, and among the input signals that are input from each of the multiple reception units, only the input signal whose header is detected by the header detection process is selected and output. And a selection / masking step of masking other input signals with the mask signal generated in the mask generation step.

According to a sixth aspect of the present invention, in the selection / mask step, the first synthesizing section synthesizes one input signal and the mask signal generated by the mask generating step with respect to another input signal. , Only when the headers from a plurality of input signals are simultaneously received in the header detection step, the one input signal, which is determined to be prioritized in advance, is output by the second synthesizing unit, and the output signal from the first synthesizing unit is output. And the output signal from the second synthesizing unit are synthesized by the third synthesizing unit and output.

According to a seventh aspect of the present invention, in the selecting / masking step, when headers from a plurality of input signals are simultaneously received in the header detecting step, one input signal determined to be prioritized in advance and another It is characterized in that the mask signal generated in the mask generation step from the input signal is combined by the second combining unit and output.

According to the series of technical means described above, when one radio signal is received by the plurality of receivers, the header (header signal) of the original radio signal is added to the input signal from each receiver. Monitoring is performed, and when a header is detected from a certain input signal, another input signal is masked to prevent noise from being mixed into the output signal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a received signal processing circuit and method according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing a basic configuration example of a remote control reception signal processing circuit as an embodiment of the present invention.
As shown in FIG. 1, a remote controller reception signal processing circuit 1000 according to the present invention includes a header detection circuit 120, a mask pulse generation circuit 130, a header detection circuit 220, a mask pulse generation circuit 230, and a selection / mask unit 300. The input signal 11 from the light receiving unit 110 and the input signal 21 from the light receiving unit 210 are received from the respective input lines (input means), and the extraction signal 34 is output. Here, the input signal 11 and the input signal 21 are signals input to the remote control reception signal processing circuit 1000 from the respective light receiving units described above, and include a remote control signal received from one remote control (not shown), It also contains various noises.

Each part shown in FIG. 1 will be described below. The light receiving unit (reception unit) 110 is a circuit that receives a remote control signal transmitted from one remote controller (not shown), and outputs a remote control signal of positive logic when receiving the light. The header detection circuit 120 constantly monitors the input signal 11 output from the reception unit 110, and outputs a signal indicating detection when the header of the remote control signal is detected from the input signal 11 to the mask pulse generation circuit 130. The mask pulse generation circuit (mask generation means) 130 includes the header detection circuit 1
When a signal indicating that the header is detected is received from 20, the mask pulse (mask signal) 13 for masking an arbitrary signal (information included in the signal) is selected / masked by the masking unit 300.
Output to. The length of the mask pulse 13 is the length from the end of the header part of the remote control signal to the end of the data part. That is, the mask pulse generation circuit 130 is assumed to generate the mask pulse from the time when the header detection circuit 120 finishes detecting the header to the time when it finishes detecting the data portion of the remote control signal.

The light receiving section (reception section) 210 is also the same as that described above.
This is a circuit for receiving a remote control signal transmitted from one remote controller (not shown), and the configuration for the input line from the light receiving unit 210 is similar to the configuration for the input line from the light receiving unit 110 described above. The header detection circuit 220 monitors the input signal 21 of the, and when the header is detected, the mask pulse generation circuit (mask generation means) 230.
Outputs the mask pulse 23 to the selection / mask unit 300.

The selection / mask section 300 includes an AND circuit 31.
0, AND circuit 320, AND circuit 330, OR
And a circuit 340. Each of the AND circuit 320 and the AND circuit 330 has an inverter on one side of the input line.

The AND circuit 310 (logical AND circuit which is the second synthesizing section) inputs the input signal 11 from the light receiving section 110 and the mask pulse 13 from the mask pulse generating circuit 130.
The mask pulse 23 or the mask pulse 2 is received by receiving the input with the mask pulse 23 from the mask pulse generation circuit 230.
When 3 is input, the input signal 11 is masked by the input mask pulse and output as the masked signal 31 to the OR circuit 340. When the mask pulse 13 and the mask pulse 23 are input, Input signal 11
Is directly output to the OR circuit 340 as the masked signal 31.

The AND circuit 320 (first synthesizing unit) receives the input of the input signal 11 from the light receiving unit 110 and the input of the mask pulse 23 from the mask pulse generating circuit 230 via the inverter, and receives the mask pulse 23. Is input, the input signal 11 is masked by the mask pulse 23 and is output to the OR circuit 340 as a masked signal 32. When the mask pulse 23 is not input, the input signal 11 is directly input to the masked signal. OR circuit 3 as 32
Output to 40.

The AND circuit 330 (first synthesizing unit) receives the input of the input signal 21 from the light receiving unit 210 and the input of the mask pulse 13 from the mask pulse generating circuit 130 via the inverter, and receives the mask pulse 13 Is input, the input signal 21 is masked by the mask pulse 13 and is output to the OR circuit 340 as a masked signal 33. When the mask pulse 13 is not input, the input signal 21 is directly input to the masked signal. OR circuit 3 as 33
Output to 40.

The OR circuit 340 (third synthesizing unit) synthesizes the after-masked signal 31, the after-masked signal 32, and the after-masked signal 33 and outputs them as the extracted signal 34.

Next, the operation of the remote control reception signal processing circuit 1000 according to the embodiment of the present invention will be described. FIG. 2 is a diagram showing an example of the flow of signal processing by the remote-control reception signal processing circuit 1000, with time transition of each signal.

As shown in FIG. 2, when the light receiving unit 110 or the light receiving unit 210 receives a remote control signal, for example, the input signal 1
As shown in the period from T0 to T1 of 1, the header signal which is a continuous H level for a predetermined fixed period or more is followed by the signal of the data part for a predetermined fixed period.

In the period from T0 to T1, an example is shown in which the remote control signal is input to the light receiving section 110 and the remote control reception signal processing circuit 1000 removes noise mixed in the input signal 21 output from the light receiving section 210. There is. Light receiving part 1
When the remote control signal is input to 10, the output from the light receiving unit 110 is the signal shown in the input signal 11. At this time,
When the header detection circuit 120 detects the header, the mask pulse generation circuit 130 generates the mask pulse 13. At this time, the input signal 21 is added to the output from the light receiving unit 210.
Even if noise as shown by is mixed, the output from the AND circuit 330 is masked by the mask pulse 13 as shown by the masked signal 33. Therefore, the output from the OR circuit 340 is obtained. Only the post-masking signal 32 which is the output from the AND circuit 320 is reflected in a certain extraction signal 34. Here, the input to the AND circuit 320 is only the input signal 11 because the mask pulse 23 is not generated, and therefore the masked signal 32 which is the output is only the information (waveform of the signal) of the input signal 11. . Since the inputs to the AND circuit 310 are the mask pulse 13 and the input signal 11, the masked signal 31 is masked like the masked signal 33. From the above, the extracted signal 34 becomes the input signal
Only the input signal 11 is output without being affected by 1.

During the period from T1 to T2, an example is shown in which the remote control signal enters the light receiving section 210 and the remote control reception signal processing circuit 1000 removes noise mixed in the input signal 11 output from the light receiving section 110. There is. Light receiving part 2
When the remote control signal is input to 10, the output from the light receiving unit 210 becomes the signal shown in the input signal 21. At this time,
When the header detection circuit 220 detects the header, the mask pulse generation circuit 230 generates the mask pulse 23. At this time, the input signal 11 is added to the output from the light receiving unit 110.
Even if noise as shown by is mixed, the output from the AND circuit 320 is masked by the mask pulse 23 as shown by the masked signal 32. Therefore, the output from the OR circuit 340 is obtained. Only the post-masking signal 33 which is the output from the AND circuit 330 is reflected in a certain extraction signal 34. Here, the input to the AND circuit 330 is only the input signal 21 because the mask pulse 13 is not generated, and therefore the masked signal 33 which is the output is only the information of the input signal 21. The input to the AND circuit 310 is mask pulse 2
3 and the input signal 21, the masked signal 31 is masked like the masked signal 32. As described above, the extracted signal 34 is output only by the input signal 21 without being affected by the input signal 11.

The period from T2 to T3 shows an example in which the remote control signals are simultaneously input to the light receiving section 110 and the light receiving section 210. In this case, since both the header detection circuit 120 and the header detection circuit 220 detect the header, the mask pulse generation circuit 130 generates the mask pulse 13 and the mask generation circuit 230 generates the mask pulse 23. The masked signal 32 output from the circuit 320 and the masked signal 33 output from the AND circuit 330 are masked. Here, since the AND circuit 310 receives the input signal 11, the mask pulse 23, and the mask pulse 33 as inputs, the masked signal 31 which is the output is only the information of the input signal 11. In this way, in the extracted signal 34 which is the output from the OR circuit 340, only the information of the input signal 11 as the post-masking signal 31 is preferentially reflected.

The remote control reception signal processing circuit 100 described above
0 is mounted on a device that can be operated by a remote control such as a projector, and by arranging the remote control signal light receiving section in each direction such as the front and rear of the device, the remote control can operate the device from various directions, It is possible to avoid malfunction of the device at low cost due to mixing of noise from the signal light receiving unit.

In the embodiment of the present invention, by inputting the input signal 11 to the AND circuit 310, the input signal 11 is prioritized when the remote control signals are simultaneously input to the light receiving unit 110 and the light receiving unit 210. As described above, the input to the AND circuit 310 is the input signal 11
By using the input signal 21 instead of
May be prioritized. Further, even when the number of input lines (the number of light receiving units) is three or more, the input to the AND circuit is switched to the input from one input line which is determined to be prioritized in advance. The input signal from the line may be prioritized.

Further, in the embodiment of the present invention, the remote control signal follows the header signal which is a continuous H level for a predetermined period or more as shown in the period T0 to T1 of the input signal 11, and is determined in advance. Although it is described as a waveform having a data portion for a fixed period, it is not limited to this as long as it is a radio signal for transmitting information, and other signal waveforms may be used.

Further, in the embodiment of the present invention, the radio signal is explained as a remote control signal, but it is not limited to this as long as it is one radio signal, and it may be a signal by a laser or an electromagnetic wave, for example.

Further, in the embodiment of the present invention, the number of input lines to the remote control reception signal processing circuit 1000 (the number of light receiving parts).
However, the number is not limited to two as long as it is plural. When the number of input lines is three or more, a configuration similar to the configuration for the input lines from the light receiving unit 110 described above is provided for each input line, and the AND circuit 320 is provided.
An AND circuit with an inverter similar to the above is configured so that the input signal from each input line and the mask pulse by the mask pulse generation circuit from another input line are input as in the above embodiment, and the AND circuit is provided. The masked signal from is output to the OR circuit 340 as in the above embodiment.

Each of the above-described embodiments is a preferred embodiment of the present invention, and various modifications can be made as described above, for example, without departing from the gist of the present invention.

[0034]

As is apparent from the above description, according to the received signal processing circuit and method of the present invention, the input signals other than the input signals used for the output can be reliably obtained from the input signals from the plurality of receiving sections. By masking with, even if noise is always mixed in the input signal other than the input signal used for output, it is possible to reliably remove the noise from the output signal.

Further, according to the received signal processing circuit and method of the present invention, when the headers are simultaneously detected from the respective input signals from the plurality of receiving sections, one original input signal is prioritized, and the original radio signal is given. It is possible to output the signal reliably and faithfully.

Further, according to the received signal processing circuit and method of the present invention, one output is provided for input signals from a plurality of receiving sections, and a plurality of decoders are not provided, so that a small-scale circuit configuration is realized. The above effects can be achieved at low cost.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a basic configuration example of a remote control reception signal processing circuit as an embodiment of the present invention.

FIG. 2 is a diagram showing an example of the flow of signal processing by a remote control reception signal processing circuit 1000 by the time transition of each signal.

[Explanation of symbols]

11,21 Input signal 13,23 Mask pulse 31, 32, 33 Masked signal 34 Extracted signal 110, 210 Light receiving part 120, 220 header detection circuit 130, 230 Mask pulse generation circuit 300 selection / mask 310 AND circuit 320, 330 AND circuit with inverter 340 OR circuit 1000 Remote control reception signal processing circuit

Claims (7)

[Claims] 1. A received signal processing circuit having a plurality of input means for receiving a signal from each of a plurality of receiving sections for receiving one radio signal having a header, wherein the input signal from each of the plurality of input means is A received signal processing circuit, which outputs only one input signal having the header and does not output other signals. 2. A header detecting unit for detecting a header from an input signal input from the input unit, and a mask generating unit for generating a mask signal for masking an arbitrary signal when the header detecting unit detects the header. Of the input signals from each of the plurality of input means, only the input signal whose header is detected by the header detection means is selected and output, and the mask generated by the mask generation means for other input signals. 2. The reception signal processing circuit according to claim 1, further comprising: a selection / mask means for masking with a signal, so that only one input signal having the header is output and other signals are not output. 3. The first synthesizing unit, wherein the selecting / masking means synthesizes a 1 input signal and a mask signal generated by detecting a header by the mask generating means from another input signal, Only when a plurality of receiving units simultaneously receive one wireless signal, a second synthesizing unit that outputs one input signal determined to be prioritized in advance, an output signal from the first synthesizing unit, and the first synthesizing unit The reception signal processing circuit according to claim 2, further comprising a third combining unit that combines the output signals from the two combining units. 4. The second synthesizing unit synthesizes the one input signal determined to be prioritized in advance and the mask signal generated by the mask generating means detecting the header from other input signals. 4. The received signal processing circuit according to claim 3, which is a logical product circuit for 5. A received signal processing method for an input signal input from each of a plurality of receiving units for receiving one radio signal having a header, the header detecting step of detecting a header from each of the input signals, When a header is detected by the header detection step,
A mask generation step of generating a mask signal for masking an arbitrary signal, and selecting only an input signal whose header has been detected by the header detection step from among the input signals input from each of the plurality of receiving units. And a masking step of masking the other input signals with the mask signal generated in the mask generating step. 6. In the selecting / masking step, a first synthesizing section synthesizes 1 input signal and another input signal with the mask signal generated in the mask generating step, and detects the header. Only when the headers from a plurality of input signals are simultaneously received in the process, one input signal determined as prioritized in advance is output by the second combining unit, and the output signal from the first combining unit and the output signal from the first combining unit are output. The received signal processing method according to claim 5, wherein the output signal from the second combining unit is combined by the third combining unit and output. 7. In the selection / masking step, if headers from a plurality of input signals are simultaneously received in the header detecting step, the priority is defined as 1 in advance.
7. The received signal processing method according to claim 6, further comprising: synthesizing the input signal of 1) and a mask signal generated by the mask generation step from another input signal by the second synthesizing unit and outputting the synthesized signal.