JP2002291065A - Wireless transmission/reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless transmission/reception system that can eliminate the time lag by remote control operations so as to provide excellent user- friendliness. SOLUTION: A user depresses a pause button of a remote controller 5 to transmit a remote control signal to a remote control light receiving section 6. A reception unit 4 decodes a remote control signal as remote control data for a temporary stop instruction, transmits the decoded data to a transmission unit 2 as a wireless radio wave and applies pause control also to an output image/voice processing section. The remote control data received by the transmission unit 2 and denoting a temporary stop instruction are demodulated and converted into a remote control signal, which is sent from a remote control signal transmitter 7 to a DVD playback device 1. The DVD playback device 1 temporarily stops the playback on the basis of the temporary stop instruction of the remote control signal received by the remote control light receiving section 6. Furthermore, the output image/voice processing section of the reception unit 4 subjected to pause control transmits a still picture signal written in an image/audio memory to a liquid crystal display monitor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique suitable for a wireless information transmission / reception system in which a source on a transmission side can be remotely controlled.

[0002]

2. Description of the Related Art In information transmission between devices, there is an increasing demand for wireless communication even in homes. As a method for transmitting information at a relatively short distance, a method based on spread spectrum modulation or the like is used. In a transmission / reception apparatus using spread spectrum modulation, the signal spectrum to be transmitted is spread so as to approximate the spectrum of white noise. It has been conventionally used as a communication means in a strong and noisy environment.

[0003] Japanese Patent Application Laid-Open No. 4-188996 discloses a proposal for employing spread spectrum modulation in a remote control device. According to this, the system control, the adapter and the audio equipment are arranged in one room, the adaptor and the TV receiver are arranged in a separate room,
The adapters are connected to each other by an AC line. A wireless remote control signal wirelessly transmitted to a predetermined remote control device is converted into a remote control electric signal, and further, spread-spectrum modulated to generate a transmission signal. The transmission signal is transmitted to another remote control device via an AC line. Transmitted to the remote control device. This is a proposal to enable remote control of commercially available wireless remote control equipment from another room without modification.

[0004] Japanese Patent Application Laid-Open No. 9-289472 discloses that
There have been proposals for improving the quality of transmitted images when controlling a plurality of devices. A plurality of image transmission devices, and each transmission device on the transmission side composed of a spread spectrum wireless transmission device,
Switch means for supplying and stopping power to a predetermined circuit, and a means for designating a transmitting device on the receiving side and transmitting a remote control signal for instructing the designated transmitting device to supply power to the predetermined circuit to the transmitting side. Is provided, by transmitting only the transmission device specified by the remote control signal, in a system that performs spread spectrum wireless transmission in a limited frequency band, when there are multiple transmission devices, the most necessary In this case, only the transmitting device that operates is operated to prevent interference and perform high-quality image transmission.

[0005]

In the prior art, consider a case in which a reproduced video being viewed is paused by a remote control device. When the pause button is pressed in the remote control device for the receiving unit, the pause signal is modulated in the receiving unit in accordance with the transmission method and transmitted to the transmitting side as a remote control signal. On the transmitting side, the received remote control signal is demodulated and, for example, the audio device is pause-controlled. In a general wireless transmission system, on the transmission side, after signal processing for each transmission system is performed, it is modulated and transmitted from an antenna, and on the reception side,
The signal received by the antenna and demodulated, after signal processing,
Although the playback device is controlled, signal processing takes time, and recently, error correction, retransmission processing, and the like have been incorporated to ensure the quality of the received signal, and further processing time has been taken.

As described above, when the transmitting apparatus and the reproducing apparatus are wirelessly connected and various signal processing is performed between them,
Since there is a time lag from the operation of the remote control device to the reflection on the playback device (specifically, depending on the content of the signal processing, but 2 to 3 seconds), for example, the pause button is pressed. , The user misunderstands that the remote control device is malfunctioning, presses the pause button again, and eventually returns to the playback state, causing inconvenience to the user.

The present invention has been made in view of such circumstances, and in a transmission / reception system connected by wireless transmission / reception, a time lag between a transmitting side and a receiving side in remote control operation is eliminated, and a user-friendly system is provided. Is provided.

[0008]

According to the present invention, there is provided an input section connected to an output of an AV apparatus, a means for processing a signal input from the input section, and a memory for recording the processed input signal. Communication means for transmitting the processed input signal as a radio wave signal and receiving the operation signal of the AV device transmitted from a receiving unit described later; and a remote control device for receiving the received operation signal of the AV device. A transmitting unit having means for converting the signal into a code signal and transmitting the code signal, an output unit connected to a display device, and a receiver for receiving a signal transmitted from the transmitting unit and receiving the signal from a remote control receiving unit described later. Communication means for transmitting an operation signal of the device; means for processing a signal transmitted and received by the communication means; a memory for recording the processed reception signal; It consists of a receiving unit and a remote control receiving means for receiving a signal, and outputs an operation signal of the AV apparatus, in which the inter and the AV apparatus the display device so as to transmit by radio waves.

Further, according to the present invention, when a pause or stop operation of the AV device is performed by a remote control device, a still image transmission to the display device or a transmission stop process is performed in the reception unit. It is like that.

Further, according to the present invention, as a means for transmitting a still image to the display device when a pause operation of the AV device is performed by a remote control device, reading of a memory in the reception unit is performed, and a pause state is set. It is intended to be.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wireless transmission / reception system according to the present invention will be described below with reference to the drawings. Figure 1
1 is a schematic diagram illustrating a configuration of a wireless transmission / reception system according to an embodiment of the present invention. The present embodiment relates to an image transmission system between a DVD reproducing apparatus employing a spread spectrum wireless system and a liquid crystal monitor. 1 is a DVD reproducing device, 2 is a transmitting unit, 3 is a liquid crystal monitor, 4 is a receiving unit, 5 is a remote control device, 6 is a remote control light receiving section of the DVD reproducing device 1, 7 is a remote control signal transmitter, and 8a and 8b are AV cables. , 9a and 9b are antennas.

The DVD reproducing apparatus 1 is connected to the transmitting unit 2 by an AV cable 8a, and a remote control signal transmitter 7 of the transmitting unit 2 receives light from a remote control light receiving section 6 provided for the DVD reproducing apparatus 1. It is located within the range. The liquid crystal monitor 3 is connected to the receiving unit 4 via an AV cable 8b. The remote control device 5 uses an infrared remote control signal, and is a device for remotely controlling the reproduction and stop of the DVD reproduction device 1. In operation, the remote control device 5 is directed to the remote control light receiving unit 6 of the reception unit 4. Manipulate. The remote control transmitter 7 uses infrared rays, and is a device that transmits a remote control code to the remote control light receiving unit 6 of the DVD playback device 1. The transmission unit 2 and the reception unit 4 are connected by radio waves based on a spread spectrum wireless system.

In the wireless transmission / reception system of the present invention, the transmission unit 2 and the DVD reproducing device 1 are provided together with AV equipment such as a television and an audio equipment together with a room (for example, the first floor).
And the receiving unit 4 and the liquid crystal monitor 3
It is assumed that they are placed in separate rooms that cannot be seen from each other, such as being placed in another room (for example, the second floor).

FIG. 2 is a block diagram showing the configuration of the transmission unit in the image transmission system of FIG. The transmission unit 2 includes an input image / audio processing unit 20, an image / audio memory 21, a communication control unit 22, a CPU 23, a remote control code transmission unit 24, an AV input unit 25, and an antenna 9a.

FIG. 3 is a block diagram showing a configuration of a receiving unit in the image transmission system of FIG. The receiving unit 4 includes an output image / audio processing unit 40, an image / audio memory 41, a communication control unit 42, a CPU 43, a remote control signal receiving unit 44, an AV output unit 45, and an antenna 9b.

Next, the operation of the present invention is described on the LCD monitor 3 installed in the room on the second floor, in a place where the infrared remote control signal from the remote control device 5 does not reach, for example, a DV below the floor.
Description will be made on the assumption that a reproduced image of the D reproducing apparatus 1 is viewed. First, the remote control device 5 is directed to the remote control light receiving unit 6 of the receiving unit 4, and a reproduction button on the remote control device 5 is pressed to transmit a reproduction instruction signal to the remote control light receiving unit 6 as an infrared remote control signal. The remote control signal received by the remote control light receiving unit 6 is sent to a remote control signal receiving unit 44.
The data is decoded as remote control data and sent to the CPU 43. The CPU 43 controls the entire receiving unit 4, modulates the supplied remote control data in the communication control unit 42, and transmits the modulated data from the antenna 9 b to the transmitting unit 2.
Is transmitted as a radio wave.

The radio wave signal transmitted from the antenna 9b is received by the antenna 9a of the transmission unit 2, and remote control data indicating a reproduction instruction is demodulated by the communication control unit 22 and transferred to the CPU 23. CPU23
Controls the entire transmitting unit 2 and transmits the received remote control data of the reproduction instruction to the remote control code transmitting section 24.
And transmits an infrared remote control signal from the remote control signal transmitter 7 to the DVD playback device 1. The DVD playback device 1 starts a playback operation based on a playback instruction signal received by the remote control light receiving unit 6.

The playback AV data output from the DVD playback device 1 is input to the AV input unit 25 of the transmission unit 2 via the AV cable 8a. AV input unit 2
A / D conversion processing, compression processing, and the like are performed on the AV data input from 5 by the input image / audio processing unit 20.
At this time, the AV data is stored in the image / audio memory 21. The AV data after the signal processing is sent to the communication control unit 22, where the data for error correction is added,
The signal is modulated and transmitted to the receiving unit 4 as a radio wave from the antenna 9a. The radio wave received by the antenna 9b of the receiving unit 4 is demodulated by the communication control unit 42, error correction is performed, and if necessary,
The retransmission control is performed and sent to the output video / audio processing unit 40. Further, in the output video / audio processing unit 40, decompression processing, D / A conversion processing, and the like are performed to restore the original AV data. At this time, the AV data is stored in the image / audio memory 41.

The restored AV data is output to an AV output unit 45.
To connect to the liquid crystal monitor 3 via the AV cable 8b to view the reproduced video and audio from the DVD reproducing device 1 installed on the first floor while staying on the second floor. be able to. Here, when the pause button is pressed by the remote control device 5 when the playback video is paused by the remote control device during viewing, the receiving unit 4 transmits the infrared remote control signal from the remote control device 5 to the remote control device similarly to the above-described playback operation. The signal is received via the light receiving unit 6, decoded by the remote control signal receiving unit 44 as remote control data for a pause instruction, and supplied to the CPU 43. CPU43
Modulates the received remote control data of the reproduction instruction in the communication control unit 42 and transmits the modulated remote control data from the antenna 9b to the transmission unit 2 as a radio wave.

At the same time, the CPU 43 outputs the output image /
Pause control is also applied to the audio processing unit 40. Antenna 9b
Is received by the antenna 9a of the transmission unit 2, remote control data indicating a reproduction instruction is demodulated by the communication control unit 22,
23. The CPU 23 converts the signal into a remote control signal for a pause instruction in the remote control code transmission unit 24, and transmits the signal to the DVD playback device 1 from the remote control signal transmitter 7.

The DVD reproducing apparatus 1 pauses the reproducing operation based on a pause instruction of the remote control signal received by the remote control light receiving section 6. Also, the output image / audio processing unit 40 to which the pause control has been applied stores the AV signal until the DVD reproducing device 1 is paused by the image / audio memory 4.
1 is controlled, but the read from the image / audio memory 41 is controlled so as not to be updated.
Is sent to the still image signal stored in the image / audio memory 41, and the image displayed on the liquid crystal monitor 3 is temporarily stopped. Therefore, a still image is instantly displayed to the user watching the liquid crystal monitor 3 after the pause button is pressed by the remote control device 5, and the DVD player 1 has the same reaction speed as when directly operating the remote control. , It can be understood that the DVD reproducing apparatus 1 is in the pause operation processing.

As described above, the reproducing apparatus and the display apparatus are connected by radio waves, and the remote control apparatus is used for radio transmission and reception by the time required for processing such as image compression / expansion processing, error correction / retransmission processing, and the like. Due to the time lag between operation and reflection on the display device, the user pressed the pause button, but did not immediately respond,
It is possible to eliminate the inconvenience of misunderstanding that the remote control device is malfunctioning, pressing the pause button again, and eventually returning to the playback state.

As described above, the pause operation using the remote controller has been described as an embodiment. However, a similar inconvenience arises with respect to a stop operation, so that this method can be used to solve the problem. The pause control is performed by the output image / audio processing unit 40.
Has been described by controlling the image / audio memory 41, but the same effect can be obtained by shutting off the output to the AV output unit 45. In particular, when the operation is stopped,
It is also possible to cut off the AV signal in the communication control unit 42.

[0024]

According to the present invention, when a pause or stop operation of an information recording / reproducing apparatus, such as an AV apparatus, particularly a DVD apparatus, installed at a remote place by a remote controller is performed, the apparatus is placed near the apparatus. By performing still image transmission or transmission stop processing to the display device in the receiving unit, the time lag required for signal processing between the transmitting side and the receiving side in remote control operation is eliminated, and user-friendly wireless transmission and reception A system can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an image transmission system as one embodiment of a wireless transmission / reception system of the present invention.

FIG. 2 is a block diagram showing a configuration of a transmission unit in the image transmission system of FIG.

FIG. 3 is a block diagram illustrating a configuration of a receiving unit in the image transmission system of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... DVD reproduction apparatus, 2 ... transmission unit, 3 ... liquid crystal monitor, 4 ... reception unit, 5 ... remote control apparatus, 6 ... remote control light-receiving part, 7 ... remote control signal transmitter, 8a, 8b ... AV
Cables, 9a, 9b: antenna, 20: input image / audio processing unit, 21, 41: image / audio memory, 22, 42
... Communication control unit, 23, 43 ... CPU, 24 ... Remote control code transmission unit, 25 ... AV input unit, 40 ... Output image / audio processing unit, 44 ... Remote control signal receiving unit, 45 ... A
V output section.

Claims (3)

[Claims] 1. An input unit connected to an output of an AV device or the like, a unit for processing a signal input from the input unit, a memory for recording the processed input signal, and A communication unit for transmitting the processed input signal and receiving the operation signal of the AV device transmitted from the receiving unit described later; and a unit for converting the received operation signal of the AV device into a remote control code signal and transmitting the signal A communication unit that receives a signal transmitted from the transmission unit and transmits an operation signal of the AV device received by a remote control reception unit described later. Means, means for processing a signal transmitted and received by the communication means, a memory for recording the processed received signal, and a remote control for receiving a remote control code signal from a remote control device It consists of a receiving unit and a signal means, a radio transceiver system, characterized in that the output and the operation signal of the AV apparatus, is transmitted between the display device and the AV equipment radio waves. 2. A means for performing a still image transmission or a transmission stop process to the display device in the receiving unit when a pause or stop operation of the AV device is performed by a remote control device. The wireless transmission / reception system according to claim 1, wherein: 3. When a pause operation of the AV device is performed by a remote control device, a read operation of a memory in the reception unit is performed as a still image transmission unit to the display device so as to be in a pause state. The wireless transmission / reception system according to claim 2, wherein: