JP2006197275A - Radio communication apparatus and radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To confirm the contents of talking even when a communication state is deteriorated or the talking is interrupted. <P>SOLUTION: When a master set 1 radio-communicates with a sub-master set 2, the master set 1 detects field strength from a received signal by a field strength detection part 18. When the communication state is deteriorated to a state where radio communication can not be maintained, the master set 1 stores a sound signal inputted from a slave set in a memory part 40 and notifies the existence of stored data through a display part 37. Thereby a user can confirm the contents of talking from the data stored in the master set 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless communication apparatus used in a television door phone system or the like that communicates audio information and video information between outdoors and indoors.

  In a conventional TV door phone system, a visitor is imaged and voice is input by a door phone slave unit with a camera installed outdoors in a detached house or a condominium. The door phone main unit installed indoors makes a voice response while watching the video of the visitor on the monitor. Similarly to the door phone master unit, a door phone sub master unit that can respond by voice while looking at the monitor is installed indoors. Wireless communication is used for communication between the door phone master unit and the door phone sub master unit.

  Such a TV door phone system is disclosed in Patent Document 1. As shown in FIG. 5, this system includes a camera-equipped doorphone slave device X, a monitor-equipped doorphone master device Y, and a monitor-equipped doorphone sub-master device Z.

  The door phone slave unit X is output from the microphone 100, the speaker 101, the microphone amplifier 102, the speaker amplifier 103, the FM demodulation circuit 104 that demodulates the FM-modulated audio signal and outputs the signal to the speaker amplifier 103, and the microphone amplifier 102. An FM modulation circuit 105 that FM modulates a voice signal to be transmitted, a camera (not shown) for capturing the appearance of a visitor, a call button (not shown), an FM demodulation circuit 104, and an FM modulation circuit 105 And a multiplexing / separation processing unit for separating the audio signal from the multiplexed signal transmitted from the doorphone master unit Y, and multiplexing the signal and the video signal and outputting them to the doorphone master unit Y via the two-wire signal line. ing.

  The door phone main unit Y is output from the microphone 200, the speaker 201, the microphone amplifier 202, the speaker amplifier 203, the FM demodulation circuit 204 that demodulates the FM-modulated audio signal and outputs it to the speaker amplifier 203, and the microphone amplifier 202. An FM modulation circuit 205 that FM-modulates the audio signal to be transmitted, a monitor (not shown), a power supply circuit 206 that supplies power to the door phone slave unit X via a two-wire signal line, and two FM-modulated audio signals A demultiplexing processing unit 207 that outputs to a doorphone slave unit X via a linear signal line and separates a multiplexed signal transmitted from the doorphone slave unit X via a two-wire signal line; A call button (not shown) that is operated when a call is started in response to a call from X, and an operation that is performed when a call is made between the doorphone master unit Y and the doorphone sub-master unit Z. A button (not shown), and a microcomputer 208 for controlling the operation of the indoor apparatus Y.

  Further, the doorphone master unit Y is a means for performing signal transmission with the doorphone sub-master unit Z, and is time-division multiplexed with a radio transmission / reception unit provided in the doorphone sub-master unit Z as a transmission medium. A wireless transmission / reception unit 209 that transmits signals to each other and an antenna 210 connected to the wireless transmission / reception unit 209 are provided.

  Further, the doorphone master unit Y includes a circuit for controlling a call on the doorphone sub-master unit Z, between the FM demodulation circuit 204 and the speaker amplifier 203, between the FM modulation circuit 205 and the microphone amplifier 202, and a monitor and demultiplexing processing unit 207. In the middle, a switch S61, a switch S62, and a switch S63 are provided, and a switch S64 is provided between the two-wire signal line and the wireless control unit 209 as a circuit for controlling a call in the doorphone sub-master unit Z. Yes.

The intercom sub-master unit Z is connected to the antenna 300, the radio transceiver unit 301 for transmitting a time-division multiplexed signal using the radio signal as a transmission medium to and from the intercom unit Y, and the radio transceiver unit 301. And a demultiplexing processing unit 302 for time-division multiplexing the compressed audio signal, an FM demodulating circuit 303 for FM demodulating the audio signal, and FM modulating the audio signal An FM modulation circuit 304, a speaker amplifier 305, a microphone amplifier 306, a speaker 307, a microphone 308, a microcomputer 309, a switch S65 for controlling a connection state between the demultiplexing processing unit 302 and the FM demodulation circuit 303, The switch S66 for controlling the connection state between the demultiplexing processing unit 302 and the FM modulation circuit 304, the demultiplexing processing unit 302, and the module And a switch S67 for controlling the connection state between data.
JP 2000-224316 A

  However, in a wireless communication system using a wireless communication device such as the doorphone master unit or the doorphone sub-master unit, even if the wireless communication device is installed indoors, depending on the installation location, it depends on the electronic device such as a microwave oven. The communication state may deteriorate due to the influence of radio wave interference or interference with other wireless communications using the same frequency band. When such a communication failure occurs, for example, communication between the doorphone master unit and the doorphone sub-master unit is interrupted and the call is interrupted. As a result, inconvenience is given to the user, and reliability as a wireless communication system is impaired.

  In view of the above, an object of the present invention is to provide a wireless communication apparatus capable of preventing loss of information during communication even when communication is interrupted and communication is interrupted.

  The present invention includes an input unit that acquires information from the outside, a wireless communication unit that wirelessly communicates with another wireless communication device, a monitoring unit that monitors a communication state, a storage unit that stores information, and wireless communication And a control unit that stores information to be transmitted in the storage unit when the communication state is deteriorated.

  If the communication state deteriorates during communication and communication is interrupted, information such as audio and video being transmitted is not sent to the wireless communication device on the other side. However, information when the communication state has deteriorated is stored in the wireless communication device on the transmission side. Therefore, the saved information can be confirmed later.

  In order to perform this confirmation, an informing unit for informing that there is stored information is provided. Alternatively, when the communication state is improved and communication becomes possible, the control unit notifies other wireless communication devices of the presence / absence of stored information. Therefore, the user can recognize that there is stored information, and outputs the information in the stored wireless communication apparatus. Alternatively, by transmitting to another wireless communication device, the information can be confirmed in the receiving wireless communication device.

  In addition, a filter unit that removes noise of the received signal is provided, the monitoring unit detects the electric field strength of the received signal, and the control unit determines the electric field strength at a predetermined level of a plurality of levels and responds to changes in the electric field strength. To determine whether to use the filter unit or to save information.

  That is, when the electric field strength decreases during communication and reaches the first predetermined level, the filter unit is used to remove noise in the received signal. Then, when the electric field strength further decreases below the first level and becomes a level at which communication cannot be maintained, the information is stored. Further, when the electric field strength changes and becomes a second predetermined level higher than the first predetermined level, the use of the filter unit is stopped.

  In this way, depending on the degree of deterioration of the communication state, if noise is removed by the filter unit, communication quality can be maintained, so that transmission of information can be maintained as much as possible. When the communication state changes in small increments, once the filter unit is used, this is continued. Therefore, since the filter unit is used until the communication state is completely improved, it is possible to prevent the use and non-use of the filter unit from changing frequently and to eliminate variations in communication quality.

  If the above wireless communication device is used as a door phone master unit and a door phone sub master unit, the door phone slave unit connected to the door phone master unit and the door phone sub master unit can communicate with each other, and information input from the door phone slave unit Is transmitted to the doorphone sub-master. When the communication state deteriorates during wireless communication between the door phone master unit and the door phone sub master unit, information from the door phone slave unit is stored in the door phone master unit. Therefore, even if information such as a visitor's voice and video is interrupted during communication, the subsequent information can be confirmed.

  According to the present invention, when a communication state is deteriorated during wireless communication and communication is interrupted, the information being transmitted can be saved to be confirmed later. Therefore, even if the input information cannot be transmitted on the way, it is saved, so that the information is not lost, and the information can always be transmitted later. As a result, a highly reliable wireless communication system can be realized.

  In the TV door phone system using the wireless communication system of the present embodiment, the door phone slave unit is communicably connected to the door phone master unit, and the door phone master unit and the door phone sub master unit are used as wireless communication devices. A wireless communication system for performing wireless communication with a machine is configured.

  The wireless communication device of the wireless communication system includes an input unit that acquires information from the outside, a wireless communication unit that performs wireless communication, a monitoring unit that monitors a communication state of wireless communication, and a storage unit that stores information And a notification unit for reporting the communication state and presence / absence of stored information, a filter unit for removing noise from the received signal, and a control unit for controlling wireless communication of information while controlling each unit.

  Then, when the communication state deteriorates during wireless communication, the control unit notifies the function of storing the information to be transmitted in the storage unit and the presence / absence of the stored information by the notification unit, or notifies other wireless communication devices. It has the function to do. Furthermore, it has a function of determining the electric field strength at a predetermined level in a plurality of stages and determining whether to use the filter unit or to save information according to the change in the electric field strength.

  FIG. 1 shows a doorphone master unit (hereinafter referred to as a master unit) and a doorphone sub master unit (hereinafter referred to as a sub master unit) which are such wireless communication devices. 1 is a parent device, 2 is a sub-master device, 3 is a parent device microphone, 4 is a parent device speaker, 5 is a parent device voice input selector, 6 is a parent device voice output selector, 7 is a parent device A / D converter, 8 Is a parent device D / A conversion unit, 9 is a parent device voice compression unit, 10 is a parent device voice expansion unit, 11 is a parent device microcomputer, 12 is a parent device filter selection unit, 13 is a parent device transmission signal processing unit, 14 Is a base unit transmission signal processing unit, 15 is a base unit transmission unit, 16 is a base unit reception unit, 17 is a base unit transmission / reception selector switch, 18 is a base unit electric field strength detection unit, 19 is a base unit antenna, and 20 is a base unit Radio control unit, 21 is a sub-base unit microphone, 22 is a sub-base unit speaker, 23 is a sub-base unit D / A conversion unit, 24 is a sub-base unit A / D conversion unit, 25 is a sub-base unit audio compression unit, 26 Is a sub master unit voice decompression unit, 27 is a sub master unit microcomputer, 28 is a sub master unit filter selection unit, and 29 is a sub master unit transmission signal. Processing unit 30, sub-base unit reception signal processing unit 31, sub-base unit transmission unit 32, sub-base unit reception unit 33, sub-base unit transmission / reception selector switch 34, sub-base unit electric field strength detection unit 35 Is a sub master unit antenna, 36 is a sub base unit radio control unit, 37 is a base unit display unit, 38 is a sub base unit display unit, 40 is a base unit communication voice memory unit, 41 is a base unit electric field strength change detection unit, 42 Is a sub-base unit communication voice memory unit, and 43 is a sub-base unit electric field strength change detection unit. The door phone slave unit is the same as a conventional one having a camera, a microphone, and a speaker.

  Here, the input unit is configured by the base unit microphone 3 and the base unit audio input selector 5 in the base unit 1, and is configured by the sub base unit microphone 21 in the sub base unit 2. The base station 1 includes a base unit transmission signal processing unit 13, a base unit reception signal processing unit 14, a base unit transmission unit 15, a base unit reception unit 16, and a base unit transmission / reception changeover switch 17. The sub-master unit 2 includes a sub-master unit transmission signal processing unit 29, a sub-master unit reception signal processing unit 30, a sub-master unit transmission unit 31, a sub-master unit reception unit 32, and a sub-master unit 2. It is constituted by a sub master radio control unit 36 having a machine transmission / reception changeover switch 33. In the base unit 1, the monitoring unit includes the base unit electric field strength detection unit 18 and the base unit electric field strength change detection unit 41. In the sub base unit 2, the sub base unit electric field strength detection unit 34, the sub base unit electric field strength change The detection unit 43 is configured. The storage unit is configured by the base unit communication voice memory unit 40 in the base unit 1, and is configured by the sub base unit communication voice memory unit 42 in the sub base unit 2. The notification unit is configured by the parent device display unit 37 in the parent device 1, and is configured by the sub parent device display unit 38 in the sub parent device 2. In the base unit 1, the filter unit is configured by the base unit filter selection unit 12, and in the sub base unit 2, the filter unit is configured by the sub base unit filter selection unit 28. The control unit is a parent device microcomputer 11 in the parent device 1, and a sub parent device microcomputer 27 in the sub parent device 2.

  Base unit 1 and sub-base unit 2 perform wireless communication using Bluetooth (registered trademark). For this reason, a Bluetooth baseband chip is preferable as the base unit radio control unit 20 and the sub base unit radio control unit 36. That is, a Bluetooth SCO (Synchronous Connection Oriented) link is used for wireless communication between the parent device 1 and the sub-parent device 2.

  In the parent device 1, the audio signal input from the parent device microphone 3 or the child device passes through the parent device audio input selector 5 and is digitally converted by the parent device A / D converter 7. The converted audio signal (digital audio signal) is compressed by the parent audio compression unit 9. The compressed audio signal is sent to the base unit transmission signal processing unit 13 of the base unit radio control unit 20, and an error detection code is added. The audio signal to which the error detection code is added is subjected to encryption processing, data whitening processing, and error correction coding processing. The signal-processed audio signal is modulated by the parent device transmission unit 15 and transmitted from the parent device antenna 19 via the parent device transmission / reception selector switch 17.

  In the sub master device 2, the signal transmitted from the master device 1 is received by the sub master device antenna 35. The received signal is received and demodulated by the sub master receiver 32 via the sub master send / receive changeover switch 33 in the sub master radio controller 36. The demodulated audio signal is sampled according to the detected timing, and then the sub-base station reception signal processing unit 30 performs processing according to each function of error correction, inverse whitening, cryptanalysis, and error detection. The signal-processed audio signal is sent to the sub-master filter selection unit 28. The audio signal that has passed through the sub-base unit filter selection unit 28 is expanded by the sub-base unit audio expansion unit 26. The expanded audio signal is converted into an analog signal by the sub master unit D / A converter 24 and output as a sound via the sub master device speaker 22.

  On the other hand, in the sub-base unit 2, the audio signal input from the sub-base unit microphone 21 is digitally converted by the sub-base unit A / D conversion unit 23. The converted audio signal (digital audio signal) is compressed by the sub master audio compression unit 25. The compressed audio signal is sent to the sub master transmission signal processing unit 29 of the sub master radio control unit 36, and an error detection code is added. The audio signal to which the error detection code is added is subjected to encryption processing, data whitening processing, and error correction coding processing. The signal-processed audio signal is modulated by the sub-master transmission unit 31 and transmitted from the sub-master antenna 35 via the sub-master transmission / reception selector switch 33.

  In base unit 1, a signal transmitted from sub base unit 2 is received by base unit antenna 19. The received signal is received by the base unit receiving unit 16 via the base unit transmission / reception changeover switch 17 in the base unit radio control unit 20 and demodulated. The demodulated audio signal is sampled according to the detected timing, and then the base unit reception signal processing unit 14 performs processing according to each function of error correction, reverse whitening, decryption, and error detection. The signal-processed audio signal is sent to the base unit filter selection unit 12. The audio signal that has passed through the base unit filter selection unit 12 is expanded by the base unit audio expansion unit 10. The expanded audio signal is converted into an analog signal by the main unit D / A conversion unit 8, and then output through the main unit audio output selector 6 via the main unit speaker 4 or the sub unit.

  Switching between voice input from the parent microphone 3 and voice input from the child machine, and switching between voice output to the parent machine speaker 4 and voice output to the child machine are performed by control of the parent microcomputer 11. The parent device microcomputer 11 switches between the parent device voice input selector 5 and the voice output selector 6 in accordance with the communication mode. Therefore, two-way communication of audio signals is possible by any communication mode between the slave unit and the master unit 1, between the slave unit and the sub master unit 2, or between the master unit 1 and the sub master unit 2.

  When the audio signal is transmitted from the parent device 1 to the sub parent device 2, the sub parent device electric field strength detection unit 34 detects the electric field strength of the signal received via the sub parent device antenna 35 and the sub parent device transmission / reception selector switch 33. I do. The level of the electric field strength is represented by an RSSI (Receive Signal Strength Indicator) value. The sub master unit electric field strength detection unit 34 detects the RSSI value and sends the detection result to the sub master unit microcomputer 27. The sub-base unit microcomputer 27 performs filter selection as to whether or not to use a filter. When the filter is used, the sub-base unit filter selection unit 28 performs filter processing on the audio signal according to the electric field strength.

  Furthermore, the sub master device microcomputer 27 drives and controls the sub master device display unit 38 according to the communication state to notify the communication state to the outside. The sub master display unit 38 has LEDs for displaying a plurality of colors. When the communication state can be maintained, for example, the green LED is turned on. When communication is not performed or when the communication state cannot be maintained, the green LED is turned off.

  Further, when an audio signal is transmitted from the sub master unit 2 to the master unit 1, the master unit electric field strength detection unit 18 of the master unit 1 similarly detects the electric field strength, and the master unit microcomputer 11 similarly selects the filter and Notification.

  In this way, by notifying the communication state by display, the user is informed that the wireless communication system is in operation, that is, in a communicable state or in communication, and the wireless communication device is detected due to an abnormality or failure in the communication environment. Can be visually informed that is not in operation. Therefore, the user can easily determine the operation status, and a user-friendly wireless communication device can be realized.

  As filter processing, the base unit filter selection unit 12 and the sub base unit filter selection unit 28 include a filter such as an LPF (Low Pass Filter), and the audio signal is deteriorated by noise due to deterioration of the communication state. Is used. As a result, even if the communication state deteriorates, the deterioration of the audio signal can be minimized.

  In the filter selection at this time, the master microcomputer 11 and the sub master microcomputer 27 compare the detected electric field strength with two preset threshold values to determine whether or not to perform the filter process on the audio signal. To do. That is, the threshold values A and B are set as threshold value A <threshold value B, and when the electric field strength is equal to or lower than threshold value A, the filter is turned on to perform the filter processing. When the electric field strength is greater than or equal to the threshold value B, the filter is turned off and no filtering process is performed. When the electric field strength is between the threshold value A and the threshold value B, the on / off state of the filter at that time is maintained.

  When a visitor is handled between the slave unit and the sub master unit 2 via the master unit 1 or when an extension call is made between the master unit 1 and the sub master unit 2, the master unit 1 and the sub master unit Wireless communication is performed between the two. During this communication, the base unit electric field strength change detection unit 41 detects a change in the output level of the electric field strength from the base unit electric field strength detection unit 18 and outputs the detection result to the base unit microcomputer 11. The master microcomputer 11 determines a change in communication state caused by a change in communication environment. When determining that the communication state deteriorates and the communication state cannot be maintained, the parent device microcomputer 11 stores the voice data to be transmitted to the sub-master device 2 in the parent device communication voice memory unit 40. Similarly, also in the sub master unit 2, when the communication state deteriorates due to a change in the communication environment, the sub master unit microcomputer 27 stores the voice data to be transmitted to the master unit 1 in the sub master unit communication voice memory unit. .

  Here, a threshold C is set as a reference level when it is determined that the communication state cannot be maintained, and threshold C <threshold A is set. When the output level of the electric field strength falls below the threshold value C or the electric field strength cannot be detected, the main unit audio compression unit 9 or the sub main unit is set so that the audio data is stored in each of the memory units 40 and 42. The output of the audio compression unit 25 is controlled. Thereby, even when the call with the visitor is interrupted for some reason, the message from the visitor is recorded in the master unit 1.

  That is, the visitor does not know that the communication between the parent device 1 and the sub-parent device 2 has been interrupted indoors, so the visitor continues to communicate the message as if the call is continuing. Therefore, base unit microcomputer 11 stores voice data from base point communication voice memory unit 40 when it is determined that the communication state cannot be maintained. Note that instead of storing the voice data in the middle of the call in this way, all the voice data from the time when the call is started may be stored. In this case, the saved voice data is deleted when the call ends normally without deteriorating the communication state.

  Therefore, after the communication state between the parent device 1 and the sub-parent device 2 is improved, the visitor's requirements can be confirmed. Similarly, when the extension call is made between the master unit 1 and the sub master unit 2, since the master unit 1 and the sub master unit 2 store the voice data, the contents of the call during the period when the communication is interrupted later. Can be confirmed with each other.

  In the base unit 1, when the voice data is stored in the communication voice memory unit 40, the base unit microcomputer 11 controls the base unit display unit 37 to notify that there is stored data. A display unit different from the display unit 37 that displays the communication state may be provided and displayed on this display unit. Alternatively, the display unit 37 may be shared, and notification may be made by changing the display pattern, such as blinking or changing the color when the display unit 37 is in the lighting state. Similarly, also in the sub master device 2, when the audio data is stored in the sub master device communication audio memory unit 42, the sub master device microcomputer 27 performs control to notify that there is stored data.

  Further, when the communication state between the master unit 1 and the sub master unit 2 is improved and communication is restored, in the master unit 1, if voice data is stored in the master unit communication voice memory unit 40, the master unit microcomputer 11 Controls the base unit communication control unit 20 to notify that the sub base unit 2 has stored data. That is, the master microcomputer 11 sends a control signal to the sub master machine microcomputer 27 so that the display on the sub master machine display unit 38 is automatically performed. Receiving the control signal through communication, the sub master microcomputer 27 displays the sub master display unit 38. The master unit 1 displays that there is a call record when communication is cut off, and can notify the user. Similarly, when the audio data is stored in the sub master communication voice memory unit 42, the sub master 2 notifies the master 1 that there is stored data.

  Next, display control in wireless communication will be described with reference to FIG. When a signal is transmitted from the sub-base unit 2 to the base unit 1, the base unit 1 first detects the electric field strength from the received signal in step S1. In step 2, it is determined whether the communication state can be maintained.

  If the communication state can be maintained, the green LED of the parent device display unit 37 is turned on in step 3. If the communication state cannot be maintained, in Step 8, the green LED of the parent device display unit 37 is turned off.

  In step S4, it is determined whether or not the electric field strength is lower than a preset threshold A. If the electric field strength is equal to or less than the threshold value A, in step S5, the filter is turned on and filtering is selected. When the electric field strength is higher than the threshold value A, the LED is turned on and the process proceeds to step S6. It should be noted that the filter is turned off in the initial state when the master unit 1 and the sub master unit 2 are powered on or reset.

  In step S6, it is determined whether or not the electric field strength is higher than a preset threshold value B. If the electric field strength is greater than or equal to the threshold value B, in step S7, the filter is turned off and the filter process is not performed. When the electric field strength is lower than the threshold value B, the filter is kept on.

  As described above, in the two-way wireless communication of the audio signal using the Bluetooth SCO link, the master unit 1 and the sub master unit 2 detect the level of the electric field strength based on the received signal, and perform the filtering process. Select availability. When communication conditions deteriorate due to radio wave interference such as indoor installation locations or microwave ovens, audio signals can be output through a filter such as an LPF to minimize the deterioration of the audio signal, and call Is possible.

  In addition, when selecting whether or not to perform the filtering process, it is possible to give hysteresis to the determination of the change in the electric field strength by using two threshold values. As a result, it is possible to suppress the fluctuation of the filter processing when the electric field intensity level is near the threshold value, compared to the case where one threshold value is used. Therefore, it is possible to prevent the filter from being frequently turned on and off, and to obtain stable call quality.

  Furthermore, by displaying and notifying the communication state, the wireless communication device is in an operational state because the wireless communication system can be communicated to the user or is operating, or the communication environment is abnormal or faulty. It can be noticed visually that there is no. Therefore, the user can easily determine the operating status and prevent unnecessary use when communication is not possible.

  Next, another display mode when notifying the communication state will be described. The display form is changed according to whether or not the filter processing is possible, and the user is notified of the communication state in an easy-to-understand manner. That is, as shown in FIG. 3, in base unit 1, first in step S1, it is determined whether or not the wireless communication system is operating normally. As a result, when it is operating, in step 2, the electric field strength is detected from the received signal from the sub master unit 2. If the system is not operating normally, in step 12, the LED on the parent device display unit 37 is turned off. In step 3, it is determined whether the communication state can be maintained. If the communication state can be maintained, the process proceeds to step 4. If the communication state cannot be maintained, the red LED of the parent device display unit 37 is turned on in step 11. In step S4, it is determined whether or not the detected electric field strength is lower than a preset threshold A. If the electric field strength is equal to or less than the threshold value A, in step S5, the filter is turned on and filtering is selected. In step 6, the yellow LED of the base unit display unit 37 is turned on. When the electric field strength is higher than the threshold value A, the green LED of the parent device display unit 37 is turned on in step 7.

  Subsequently, in step S8, it is determined whether or not the detected electric field strength is higher than a preset threshold value B. If the electric field strength is greater than or equal to the threshold value B, the filter is turned off and the filter process is not performed in step S9. In step 10, the green LED of the base unit display unit 37 is turned on. When the electric field strength is lower than the threshold value B, in step S13, the yellow LED is turned on with the filter turned on. The same display is performed on the sub-master 2.

  In this way, by displaying the filter selection state in different forms, it becomes possible to let the user know the communication environment where the wireless communication apparatus is placed in a visible form. This makes it easy to see at a glance whether the communication status is good, whether it needs to use a filter, has deteriorated, cannot maintain communication, or is not operating due to a failure. Can be communicated intuitively to the user. The user can easily determine the operation status, and can take measures such as changing the installation location of the apparatus or checking whether or not a failure occurs. Therefore, it is possible to prevent or minimize the deterioration of the audio signal in advance. As a result, it is possible to provide a wireless communication system that can always maintain a communication state in a favorable environment.

  As another display mode, instead of turning on the LED, a character display may be displayed using a display such as a liquid crystal panel in the master display unit 37 and the sub master display unit 38. In accordance with the electric field strength of the received signal, master device microcomputer 11 and sub master device microcomputer 27 control the display contents of master device display unit 37 and sub master device display unit 38, respectively. For example, when the electric field strength level is higher than the predetermined level, “good” is displayed, and when the electric field strength level is lower than the predetermined level, “normal” is displayed and the communication state is displayed. If the value cannot be maintained, the word “defective” is displayed. Alternatively, display may be performed such that the level meter expands or contracts on the display unit according to the electric field strength level, or a pictorial symbol or the like may be displayed according to the strength other than characters and level meters.

  Thus, by performing display in which the display form changes according to the electric field strength, it is possible to visually notify the user of the communication state of the wireless communication device. Therefore, it is possible to intuitively convey the communication state to the user at a glance, and the user can easily and reliably determine whether or not communication is possible. When the communication state is bad, it is possible to obtain a good communication quality by taking measures that can solve this problem.

  Then, in base unit 1 and sub base unit 2, the contents of the call are stored when the communication state is poor. The operation at this time will be described with reference to FIG. First, in step S1, the base unit 1 detects whether the base unit 1 and the sub base unit 2 are in a communication state. If in the communication state, the electric field strength is detected in step 2. In step 3, it is determined whether or not the electric field strength level has changed to a level at which the communication state cannot be maintained. If the electric field strength level is higher than the threshold value, it is determined in step 11 whether or not the call has ended. If the call is continuing, the process returns to step 2 to continuously detect the change in the electric field strength, and the change in the electric field strength is continuously detected while the call is continued. If the electric field strength level is less than or equal to the threshold value, it is determined in step 4 whether there is input audio data. If there is no audio data, there is no data to be recorded, so it is considered that the call has ended, and in step 7, LED display or the like is performed as described above to promote improvement of the call environment. If there is audio data, the data is stored in the base unit communication audio memory 40 in step 5. In step 6, a message indicating that the data is stored is displayed on the parent device display section 37 on the transmission side.

  Further, in step 8, it is determined whether the electric field strength level has returned to a level that can maintain communication. If the communication state has not improved, in step 12, LED display or the like for prompting improvement of the call environment is performed, and the display is continued until the communication state is improved. When the electric field strength level is improved to a level at which communication can be maintained, in step 9, the sub-master unit 2 is automatically notified that the audio data is on the transmission side. In the sub master unit 2, the sub master unit display unit 38 notifies that the audio data is in the master unit 1. The user can recognize that the voice data is stored. Similarly, the sub-master 2 stores the voice data and notifies it.

  The user who has received such notification can go to the master unit 1 or the sub-master unit 2, reproduce the stored voice data, and listen to the contents. Therefore, even if communication is interrupted during a call with a visitor, since the voice data from the visitor is stored, it is possible to confirm the requirements.

  In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. Wireless communication in this system is not limited to Bluetooth, and a wireless LAN or a cordless telephone may be used.

  And as information to preserve | save, you may preserve | save not only audio | speech data but the video data imaged with the door phone cordless handset. In addition to notifying that there is stored data, the stored data may be transmitted. That is, when communication is possible, the sub-master unit transmits a control signal to the master unit so as to transmit audio data. The master unit that has received this signal transmits data to the sub-master unit. The user can confirm the contents by outputting the data transmitted in the sub-master unit. Similarly, stored data is transmitted from the sub-master unit to the master unit.

  Further, when the information input from the door phone slave unit is stored in the master unit, the master unit may notify the door phone slave unit that data is being stored. As a result, the visitor can recognize that the communication state has deteriorated and cannot make a call, and can simply input a message.

Configuration diagram of main unit and sub-main unit of TV door phone system of the present invention Flow chart of filter selection and display during wireless communication Flow chart of filter selection and display in other forms during wireless communication Flow chart of data storage during wireless communication Configuration diagram of conventional TV door phone system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door phone main unit 2 Door phone sub main unit 11 Main unit microcomputer 12 Main unit filter selection unit 18 Main unit electric field intensity detection unit 20 Main unit radio control unit 27 Sub main unit microcomputer 28 Sub main unit filter selection unit 34 Sub main unit electric field strength Detection unit 36 Sub master unit radio control unit 37 Master unit display unit 38 Sub master unit display unit 40 Base unit communication voice memory unit 41 Base unit electric field strength change detection unit 42 Sub base unit communication voice memory unit 43 Sub base unit field strength change Detector

Claims (7)

An input unit that acquires information from the outside, a wireless communication unit that wirelessly communicates with other wireless communication devices, a monitoring unit that monitors the communication state, a storage unit that stores information, and a communication state during wireless communication A wireless communication apparatus comprising: a control unit that stores information to be transmitted in the storage unit when the communication quality deteriorates. The wireless communication apparatus according to claim 1, further comprising a notification unit that notifies that there is stored information. The wireless communication apparatus according to claim 1, wherein the control unit notifies the presence or absence of stored information to another wireless communication apparatus. A filter unit that removes noise of the received signal is provided, the monitoring unit detects the electric field strength of the received signal, and the control unit determines the electric field strength at a predetermined level of a plurality of steps, and the control unit determines the electric field strength according to a change in electric field strength The wireless communication apparatus according to claim 1, wherein it is determined whether to use a filter unit or to store information. An input unit that acquires information from the outside, a wireless communication unit that performs wireless communication, a monitoring unit that monitors a communication state, a storage unit that stores information, and a control unit that controls wireless communication of information A wireless communication system comprising a plurality of wireless communication devices and transmitting and receiving information between the wireless communication devices, wherein the wireless communication device stores the information to be transmitted when detecting that the communication state has deteriorated A wireless communication system, wherein the wireless communication system is stored in a unit. 6. The wireless communication system according to claim 5, wherein when the communication state is improved, the wireless communication device notifies other wireless communication devices of the presence / absence of stored information. 5. A television door phone, wherein the wireless communication device according to claim 1 is used as a door phone master unit and a door phone sub master unit, and a door phone slave unit is connected to the door phone master unit so as to be communicable. system.

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