JP5084552B2 - COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, COMMUNICATION CONTROL PROGRAM, AND RECORDING MEDIUM - Google Patents

Description

  The present invention relates to a communication control device, a communication control method, a communication control program, and a recording medium on which the communication control program is recorded.

  Conventionally, various devices are mounted on a moving body such as a vehicle. In many of these devices, power for operation is supplied from a power source such as a battery mounted on a moving body. Among such devices, with the progress of digital technology in recent years, devices that cooperate in operation by data communication have appeared.

  In order to reduce the amount of the total wiring including the power supply wiring and the data communication wiring while realizing such data communication, a technique that employs power line communication (hereinafter also referred to as “PLC”) has been proposed ( (See Patent Document 1). In such power line communication, although not paid attention when mounted on a mobile body, a technique for performing data communication with an appropriate transmission output and performing stable data communication has been proposed (see Patent Document 2). : Hereinafter referred to as “conventional example”).

  In the conventional technique, a reception situation obtained when communication is performed at a predetermined transmission level is specified and compared with the current reception situation. The actual transmission level is controlled based on the result of the comparison.

JP 2006-339821 A JP 2004-304439 A

  By the way, in the mobile body, power is supplied to various types of devices via the power supply wiring. Devices that receive such power supply include a power window that instantaneously requires a large current in addition to data communication.

  When an instantaneous large current as described above is generated, a large noise is instantaneously generated in the power supply wiring serving as a communication path in the power line communication. The conventional technology is ineffective against such instantaneous noise. Further, in noise countermeasure techniques other than the conventional example, generally, countermeasures are taken after detecting the occurrence of noise, so it is difficult to take effective countermeasures against instantaneous noise.

  For this reason, there is a need for a technique that can take an effective measure against instantaneous noise caused by the operation of a noise generating device that causes noise to be superimposed on a power supply wiring serving as a data communication path. Meeting this requirement is one of the problems to be solved by the present invention.

  The present invention has been made in view of the above circumstances, and a communication control apparatus and communication that can effectively cope with noise associated with the operation of a noise generating device that causes noise to be superimposed on a communication path. An object is to provide a control method.

According to the first aspect of the present invention, there is provided detection means for detecting a sign of start of noise generation operation by at least one noise generation device that causes noise superimposition on the communication path; based on a detection result by the detection means; Estimation means for estimating a noise generation period; data transmission control means for stopping data transmission for at least a part of the noise generation period estimated by the estimation means; and the estimation means includes the noise A communication control characterized in that a noise generation mode associated with the operation of the generating device is measured, and the noise generation mode associated with the next operation of the noise generating device is estimated in consideration of the measured noise generation mode. Device.

The invention according to claim 9 is a detection step of detecting a sign of the start of a noise generation operation by at least one noise generation device that causes noise to be superimposed on the communication path; based on a detection result in the detection step , for at least a portion of the period of the noise generation period estimated in the estimation step, and a data transmission stop step of stopping the data transmission; estimating step and for estimating the noise generation period with the in the estimating step, the A noise generation mode associated with the operation of the noise generating device is measured, and the noise generation mode associated with the next operation of the noise generating device is estimated in consideration of the measured noise generation mode. It is a control method.

A tenth aspect of the present invention is a communication control program that causes a calculation means to execute the communication control method according to the ninth aspect.

The invention according to an eleventh aspect is a recording medium in which the communication control program according to the tenth aspect is recorded so as to be readable by the arithmetic means.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

[Constitution]
FIG. 1 schematically shows a configuration of a system 900 including a communication master unit 700 as a communication control apparatus according to the present embodiment. The system 900 is mounted on a vehicle.

As shown in FIG. 1, the system 900 includes a power supply unit 100, a vehicle control unit 200, and an electrical system 300. The system 900 includes an audio data transmission unit 500 and audio output units 800 ₁ and 800 ₂ .

Said power supply section 100 generates the operating power of the other elements 200,300,500,800 _1, 800 _2, in the form of a predetermined voltage, the other elements 200,300,500,800 _1, 800 to ₂ In contrast, operating power is supplied. The supply of the operating power is performed via the power wiring PWL.

  The vehicle control unit 200 controls the electrical system 300. In this embodiment, the vehicle control unit 200 includes a central processing unit (CPU) and the like.

The electrical system 300 includes various electrical devices. These electrical devices are configured to operate under the control of the vehicle control unit 200 that is performed by sending and receiving a control signal OPC. These electrical devices include noise generating devices 310 ₁ , 310 ₂ ,... As shown in FIG.

Here, the term “noise generating device” refers to the generation of noise in the power wiring PWL accompanying the operation of the device between the audio data transmission unit 500 and the audio output units 800 ₁ and 800 ₂ described later. This refers to electrical equipment that cannot be ignored for communications performed via the Internet. An example of such a noise generating device is a power window in which a motor is driven.

Each of the noise generating devices 310 _j (j = 1,...) Operates under the control of the vehicle control unit 200 performed by transmission / reception of the control signal OPC _j that is a part of the control signal OPC. The operation start and end indications are reported to the audio data transmission unit 500 as noise indication information NPD _j . Note that the noise precursor information NPD _j is collectively referred to as noise precursor information NPD.

In the present embodiment, the noise generating device 310 _j0 that is one of the noise generating devices 310 _j (j = 1,...) Is a power window. As shown in FIG. 3, the power window 310 _j0 includes an operation switch (hereinafter also referred to as “SW”) 311 _j0 and a motor 312 _j0 .

The SW 311 _j0 is turned on / off in response to an operation by the user of the power window 310 _j0 . This ON / OFF information is output to the vehicle control unit 200 as an operation control request OPQ _j0 which is a part of the control signal OPC _j , and is output to the audio data transmission unit 500 as noise predictor information NPD _j0. Is done.

The motor 312 _j0 is supplied with operating power from the power supply unit 100 through the power wiring PWL, and rotates in accordance with a motor control command OPA _j0 that is a part of the control signal OPC _j from the vehicle control unit 200. Do. That is, when a command to rotate the motor is _received as the motor control command OPA _j0 , the motor 312 _j0 rotates, and when a command to stop the rotation of the motor is _received as the motor control command OPA _j0. The motor 312 _j0 stops rotating.

In the present embodiment, when the SW 311 _j0 is turned on, the vehicle control unit 200 issues a command that the motor should rotate as the motor control command OPA _j0 , and when the SW _{311 j0} is turned off. The vehicle control unit 200 issues a command to stop the rotation of the motor as the motor control command OPA _j0 .

These, depending on the transition of the operation of the power window 310 _j0 corresponding to ON / OFF of the SW 311 _j0, noise is generated in the power line PWL. In general, in the generation of noise in the power wiring PWL accompanying the operation of the power window, first, high level noise is generated when the motor is started. During subsequent motor operation, a relatively low level of noise is generated. A high level of noise is generated when the motor is stopped.

Examples of time variation of the noise generated in the power wiring PWL according to transition of the operation of the power window 310 _j0 corresponding to ON / OFF of these SW 311 _j0 is shown in FIG. In the example shown in FIG. 4, the level of the generated noise is substantially “0” until the time (TON = TON ₁ ) when the ON time of SW311 _j0 is TON = 0. Subsequently, a period from time (TON = TON ₁ ) to time (TON = TON ₂ ) (hereinafter also referred to as “first noise period”) mostly exceeds the high level threshold value NTH (hereinafter referred to as “high noise level”). Also referred to as “period”. Next, a period (hereinafter also referred to as “second noise period”) from time (TON = TON ₂ ) to time (TOF = TOF ₁ ) when SW311 _j0 OFF time is set to TOF = 0 is high. Although it does not exceed the level threshold value NTH, it is a period during which the state exceeding the low level threshold value NTL continues (hereinafter also referred to as “medium noise level period”). A period from time (TOF = TOF ₁ ) to time (TOF = TOF ₂ ) (hereinafter also referred to as “third noise period”) is a high noise level period. When the third noise period ends, no noise is generated.

Here, the high level threshold value NTH maintains communication reliability even if high redundancy is adopted in audio data communication between the audio data transmission unit 500 described later and the audio output units 800 ₁ and 800 _2. It is determined based on experiments, simulations, experiences, etc., from the viewpoint of whether or not it is considered impossible. For this reason, the high noise level period is a period during which it is desirable to stop the voice data communication between the voice data transmission unit 500 and the voice output units 800 ₁ and 800 ₂ .

Further, the low level threshold value NTL can maintain communication reliability when a low redundancy is adopted in audio data communication between the audio data transmission unit 500 and the audio output units 800 ₁ and 800 _2. It is determined based on experiment, simulation, experience, etc. from the viewpoint of whether or not it can be considered. For this reason, in the middle noise level period, communication reliability cannot be maintained with low redundancy with good communication efficiency, but communication reliability can be maintained with high redundancy. If the noise level is lower than the low level threshold value NTL, the reliability of communication is ensured even if a low redundancy is adopted in the audio data communication between the audio data transmission unit 500 and the audio output units 800 ₁ and 800 ₂ . Can be maintained.

In the present embodiment, it is assumed that the noise shown in FIG. 4 is generated in the power wiring PWL in response to the ON / OFF of the _SW 311 _j0 .

Returning to FIG. 1, the audio data transmission unit 500 generates audio data and transmits the audio data to the audio output units 800 ₁ and 800 ₂ via the power wiring PWL. The audio data transmission unit 500 having such a function includes a sound source unit 600 and a communication master unit 700.

The above sound source unit 600 generates sound data SD ₂ audio data SD ₁ and the audio output unit 800 for the _second sound output unit 800 _1, and sends to the communication master unit 700. The sound source unit 600 having such a function generates audio data SD ₁ and SD ₂ from, for example, audio data recorded on a compact disc (CD) and audio data included in a digital broadcast wave.

The communication master unit 700 receives the audio data SD ₁ and SD ₂ from the sound source unit 600. Then, the communication master unit 700 sends the audio data SD ₁ and SD ₂ with the designation of the transmission destination as the audio data SD to the audio output units 800 ₁ and 800 ₂ through the power wiring PWL. Further, the communication master unit 700 sends the control data CD ₁ and CD ₂ designating the communication protocol of the voice data communication as the control data CD to the voice output units 800 ₁ and 800 ₂ through the power wiring PWL. In this embodiment, two types of communication protocols for voice data communication with different degrees of redundancy can be adopted.

Note that the audio data SD and the control data CD are sent to the audio output units 800 ₁ and 800 ₂ via different logical channels. Here, in this embodiment, the logical channel through which the control data CD passes has a low data transfer speed and is not easily affected by noise in the power wiring PWL. On the other hand, the logical channel through which the audio data SD passes can transfer data at high speed, but is easily affected by noise in the power wiring PWL.

  As shown in FIG. 5, the communication master unit 700 having the above functions includes a data buffer (BUF) 710 and a noise period estimation unit 720 as detection means and estimation means. Furthermore, the communication master unit 700 includes a transmission processing unit 730 as data transmission control means.

The BUF 710 receives the audio data SD ₁ and SD ₂ from the sound source unit 600. The BUF 710 temporarily stores the received audio data SD ₁ and SD ₂ until it is read out. The read audio data SD ₁ and SD ₂ are sent to the transmission processing unit 730.

  The noise period estimation unit 720 receives the noise predictor information NPD from the electrical system 300. Then, the noise period estimation unit 720 estimates the noise period based on the noise predictor information NPD. This estimation result is reported to the transmission processing unit 730 as noise period estimation information NPR. As shown in FIG. 6, the noise period estimation unit 720 having such a function includes a storage unit 721 and a noise period information report unit 725.

The storage unit 721 is provided with a noise period information storage area 728. The noise period information storage area 728 stores noise period information NIF _j corresponding to the noise generating device 310 _j (j = 1, 2,...) As shown in FIG. 7A.

Each of the noise period information NIF _j includes, as shown in FIG. 7B, noise period start information NIF _{j, 1} which is time information from the noise occurrence predictor phenomenon to the start of the noise period regarding the noise generating device 310 _j , The noise mode information NIF _{j, 2} in the noise period related to the noise generating device 310 _j is included.

For example, the power window 310 _j0 is defined as SW311 _j0 being turned on as a noise occurrence predicting phenomenon, and as shown in FIG. 8, the noise period start information NIF _j0,1 is “time (TON _1). -0) "is stored (see FIG. 4). Further, as the noise mode information NIF _j0,2 , information on the first noise period, the second noise period, and the third noise period is stored. Here, as the information of the first noise period, it is stored that “the period from the start of the noise period to the lapse of time (TON ₂ −TON ₁ ) is a high noise level period” (see FIG. 4). Further, as the information of the second noise period, “the medium noise level period from the end of the first noise period to the lapse of time (TOF ₁ −0) after SW311 _j0 is turned off” is stored together with the average noise level. (See FIG. 4). As information on the third noise period, it is stored that “the period from the end of the second noise period to the lapse of time (TOF ₂ −TOF ₁ ) is a high noise level period” (see FIG. 4).

Depending on the type of noise generating device, there may be a low noise period in which the noise level is lower than the low level threshold value NTL. In such a case, the start time and end time of the low noise level period, and the average noise level in the low noise level period are also stored in the noise mode information NIF _{j, 2} .

Each content of the noise period information NIF _j is determined in advance based on experiments, simulations, experiences, and the like.

  Returning to FIG. 6, the noise period information reporting unit 725 receives the noise predictor information NPD from the electrical system 300. Subsequently, the noise period information report unit 725 reads the noise period information corresponding to the received noise predictor information NPD from the noise period information storage area 728 of the storage unit 721 as data ERD. Then, the noise period information reporting unit 725 estimates the subsequent noise generation status based on the read noise period information, and reports the estimation result to the transmission processing unit 730 as noise period estimation information NPR.

  Note that the noise period information report unit 725 estimates the existence of a high noise level period or a medium noise level period as a result of estimating the noise occurrence state during which it is not preferable to adopt the normal communication method in a period in which no noise is generated. In this case, the noise period estimation information NPR is reported to the transmission processing unit 730.

For example, as the noise predictive information NPD from electrical system 300, receives the fact that the SW 311 _j0 of the power window 310 _j0 is turned ON, the noise period information reporting unit 725, the noise period of the storage unit 721 the noise period information NIF _j0 Read from the information storage area 728. Then, the noise period information reporting unit 725 has “as the first noise period after the time (TON ₁ −0) has elapsed as an aspect of noise generation resulting from the operation of the power window 310 j0 _following the ON of the _SW 311 _j0. , Being in a state of a high noise level period over time (TON ₂ -TON ₁ ) ”and“ being in a state in which the middle noise level period continues as the second noise period after the end of the first noise period. Is estimated.

Furthermore, as the noise predictive information NPD from electrical system 300, receives the fact that the SW 311 _j0 of the power window 310 _j0 is turned OFF, the noise period information reporting unit 725, the noise period of the storage unit 721 the noise period information NIF _j0 Read again from the information storage area 728. Then, the noise period information reporting unit 725 includes “the second noise period ends after the lapse of time (TOF ₁ −0)”, “third” as the noise generation mode derived from the operation of the power window 310 _j0 . As the noise period, a high noise level period extending from the end of the second noise period to the time (TOF ₂ -TOF ₁ ) ”and“ no noise generation period after the end of the third noise period ” Is estimated.

  As described above, after estimating a new noise generation mode based on the newly received noise precursor information NPD, the noise period information report unit 725 was estimated based on the previously received noise precursor information NPD. When the noise period accompanying the operation of another noise generating device continues, a new noise generation mode is superimposed on the continued noise generation mode. The superposition result obtained in this way is estimated as a future noise generation mode.

  Here, in the above superposition, when one is a high noise level period, the period is estimated as a high noise level period. Further, when the medium noise level period or low noise level period and the medium noise level period or low noise level period are overlapped, the sum of both average noise levels is calculated, and the calculation result and the high level threshold value are calculated. It is compared with NTH and the low level threshold value NTL, and it is estimated whether the period is a high noise level period, a medium noise level period, or a low noise level period.

  Future noise generation modes estimated as described above are reported to the transmission processing unit 730 as noise period estimation information NPR.

Returning to FIG. 5, the transmission processing unit 730 receives the data RDA from the BUF 710 (the same content as the audio data SD ₁ and SD ₂ described above) and the noise period estimation information NPR from the noise period estimation unit 720. Then, the transmission processing unit 730 controls the communication mode based on the noise period estimation information NPR, and uses the audio data SD ₁ and SD ₂ with the designation of the transmission destination as the audio data SD through the power wiring PWL. And transmitted to the audio output units 800 ₁ and 800 ₂ .

  Here, in the period designated as the high noise level period by the noise period estimation information NPR, the transmission processing unit 730 interrupts data transmission in principle. Note that, when the high noise level period continues beyond the allowable stop time of the voice data communication, the transmission processing unit 730 executes data transmission adopting high redundancy after the allowable stop time elapses. Further, data transmission adopting high redundancy is executed for the period designated as the middle noise level period by the noise period estimation information NPR. In addition, for the period designated as the low noise level period and the noise-free period by the noise period estimation information NPR, data transmission employing a low redundancy is executed.

Here, the specification of the redundancy is performed by temporarily stopping the transmission of the audio data SD and transmitting the control data CD ₁ and CD ₂ including the specification of the redundancy as the control data CD through the power wiring PWL. The audio output units 800 ₁ and 800 ₂ are notified.

  Note that the allowable stop time of the audio data communication is determined in advance based on experiments, simulations, experiences, and the like, from the viewpoint of preventing interruption of the reproduced audio. The capacity of the BUF 710 described above is determined in advance corresponding to the predetermined time.

Returning to FIG. 1, each of the audio output units 800 _k (k = 1, 2) outputs audio based on the audio data SD _k in the audio data SD from the audio data transmission unit 500. The audio output unit 800 _k having such a function includes a communication slave unit 810 _k and a speaker 820 _k .

The communication slave unit 810 _k receives the audio data SD from the audio data transmission unit 500. Then, the communication slave unit 810 _k extracts the audio data SD _k in the audio data SD, generates an output audio signal AOS _k , and sends it to the speaker 820 _k . As shown in FIG. 9, the communication slave unit 810 _k having such a function includes a reception processing unit 811 _k , a data buffer (BUF) 812, a digital to analog converter (DAC) 813, a power And an amplifier (AMP) 814.

The reception processing unit 811 _k receives the audio data SD and the control data CD from the audio data transmission unit 500. Then, the reception processing unit 811 _k in accordance with the sound data SD _k communication protocol of the degree specified redundancy is utilized for the control data CD _k for communication slave unit 810 _k in the control data CD, extract audio data SD _k . The audio data SD _k thus extracted is sent from the reception processing unit 811 _k to the BUF 812.

The BUF 812 receives the audio data SD _k from the reception processing unit 811 _k . The BUF 812 temporarily stores the received audio data SD _k and outputs it to the DAC 813 at a predetermined cycle determined from the viewpoint of audio reproduction. Note that the capacity of the BUF 812 is about ½ of the capacity of the BUF 710 described above.

The DAC 813 receives the audio data SD _k from the BUF 812. The DAC 813 converts the audio data SD _k into an analog signal. The analog conversion result is sent from the DAC 813 to the AMP 814 as an analog conversion signal ACS _k .

The AMP 814 receives the analog conversion signal ACS _k from the DAC 813. Then, AMP814 is power-amplified analog conversion signal ACS _k, and generates an output audio signal AOS _k. The output audio signal AOS _k thus generated is sent from the AMP 814 to the speaker 820 _k .

Returning to FIG. 1, the speaker 820 _k receives the output audio signal AOS _k from the communication slave unit 810 _k . The speaker 820 _k reproduces sound according to the output sound signal AOS _k and outputs the sound toward the sound field space.

[Operation]
Next, the operation of the system 900 configured as described above will be described mainly focusing on the transmission processing of the audio data SD from the audio data transmission unit 500 to the audio output units 800 ₁ and 800 ₂ .

Hereinafter, an example in which only the power window 310 _{j0 of} the noise generating devices 310 ₁ , 310 ₂ ,... _Operates will be described. Initially, it is _assumed that the state in which the power window 310 _j0 does not operate continues and low-redundancy communication of the audio data SD is performed. Further, the _lengths of the first noise period and the third noise period, which are high noise level periods in the noise period associated with the operation of the power window 310 _j0 described above, are shorter than the allowable stop time of the voice data communication described above. .

In this state, when the ON operation is performed on the operation switch 311 _j0 of the power window 310 _j0 , as shown in FIG. 10, this is indicated as noise predictor information NPD _{j0 and} the communication master unit 700 of the audio data transmission unit 500. Is reported to the noise period estimation unit 720. In the noise period estimation unit 720 that has received this report, the noise period information report unit 725 first reads the noise period information NIF _J0 from the noise period information storage area 728 of the storage unit 721. Then, the noise period information reporting unit 725 has “as the first noise period after the time (TON ₁ −0) has elapsed as an aspect of noise generation resulting from the operation of the power window 310 j0 _following the ON of the _SW 311 _j0. , Being in a state of a high noise level period over time (TON ₂ -TON ₁ ) ”and“ being in a state in which the middle noise level period continues as the second noise period after the end of the first noise period. Is estimated. A noise period estimation result (part 1) that is the estimation result is reported to the transmission processing unit 730 as noise period estimation information NPR.

Upon receiving the noise period estimation result (part 1), the transmission processing unit 730 _performs the operation of the power window 310 _j0 until the time (TON ₁ −0) elapses from the reception time of the noise period estimation result (part 1). Until the accompanying first noise period starts, transmission of the audio data SD with low redundancy is continued. When the first noise period starts, the transmission processing unit 730 stops transmission of the audio data SD until the time (TON ₂ -TON ₁ ) elapses and the first noise period ends.

When the first noise period ends and the second noise period associated with the operation of the power window 310 _j0 starts, the transmission processing unit 730 uses the control data CD to output the voice data communication with high redundancy, and outputs the voice. The units 800 ₁ and 800 ₂ are notified. Subsequently, the transmission processing unit 730 transmits the voice data SD with high redundancy.

Thereafter, when the OFF operation to the operation switch 311 _j0 power window 310 _j0 is performed, the fact is reported to the noise period estimating unit 720 in the communication master unit 700 of the audio data transmitting unit 500 as the noise predictive information NPD _j0 The In the noise period estimation unit 720 that has received this report, the noise period information report unit 725 reads the noise period information NIF _J0 from the noise period information storage area 728 of the storage unit 721 again. Then, the noise period information reporting unit 725 includes “the second noise period ends after the lapse of time (TOF ₁ −0)”, “third” as the noise generation mode derived from the operation of the power window 310 _j0 . As the noise period, a high noise level period from the end of the second noise period to the time (TOF ₂ -TOF ₁ ) ”and“ after the end of the third noise period, a noise-free period ” Estimate that. The noise period estimation result (part 2), which is the estimation result, is reported to the transmission processing unit 730 as noise period estimation information NPR.

Receiving the noise period estimation result (part 2), the transmission processing unit 730 _performs the operation of the power window 310 _j0 until the time (TOF ₁ −0) has elapsed since the reception of the noise period estimation result (part 2). Until the accompanying third noise period starts, transmission of the audio data SD with high redundancy is continued. Then, when the third noise period starts, the transmission processing unit 730 stops transmission of the audio data SD until time (TOF ₂ -TOF ₁ ) elapses and the third noise period ends.

When the third noise period ends and the noise period associated with the operation of the power window 310 _j0 ends, the transmission processing unit 730 uses the audio data output unit 800 as control data CD to start low-redundancy audio data communication. _1, and notifies the 800 _2. Subsequently, the transmission processing unit 730 transmits the audio data SD with low redundancy.

Even if the power window 310 _j0 than noise device operates, in the same manner as the above power window 310 _j0 operates, noise period estimating unit based on the noise predictive information NPD is, the subsequent noise generation that occurs The mode is estimated, and the estimation result is reported to the transmission processing unit 730. Based on the report result, the transmission processing unit 730 controls voice data transmission.

  When the operations of a plurality of noise generating devices overlap, after estimating the noise generation mode corresponding to the received noise predictor information NPD based on the newly received noise predictor information NPD, the noise period information report unit 725 If the noise period associated with the operation of another noise generating device estimated based on the previously received noise predictor information NPD is continued, a new noise generating mode is added to the continuing noise generating mode. Overlapping. Future noise generation modes obtained as a result of such superposition are estimated.

  Here, in the above superposition, when one is a high noise level period, the period is estimated as a high noise level period. Further, when the medium noise level period or low noise level period and the medium noise level period or low noise level period are overlapped, the sum of both average noise levels is calculated, and the calculation result and the high level threshold value are calculated. It is compared with NTH and the low level threshold value NTL, and it is estimated whether the period is a high noise level period, a medium noise level period, or a low noise level period.

  In addition, for the period designated as the high noise level period by the noise period estimation information NPR, the transmission processing unit 730 stops the data transmission in principle, but the high noise level period is permitted to stop the voice data communication. When continuing for more than time, the transmission process part 730 performs transmission of the audio | speech data which employ | adopted high redundancy after progress of the stop permissible time.

As described above, in this embodiment, when the noise predictor information NPD is received from the electrical system 300, the noise period information stored in advance in the noise period information storage area 728 in the storage unit 721 in the noise period estimation unit 720. The noise period information reporting unit 725 in the noise period estimating unit 720 estimates the subsequent noise mode and reports the estimation result to the transmission processing unit 730. Upon receiving this report, the transmission processing unit 730 controls the transmission mode of the audio data SD to the audio output units 800 ₁ and 800 ₂ corresponding to the subsequent noise mode. For this reason, the audio data transmitting unit 700 can take appropriate measures without delay for noise generation, and transmit the audio data SD to the audio output units 800 ₁ and 800 ₂ .

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, in the above-described embodiment, the present invention is applied when transmitting audio data to two audio output units by power line communication. However, the number of audio output units may be any number.

  Further, in the above embodiment, the present invention is applied when transmitting voice data by power line communication. However, the present invention may be applied when transmitting data other than voice data.

  In the above embodiment, the present invention is applied when data is transmitted by power line communication. However, the present invention may be applied when data is transmitted by communication other than power line communication.

  In the above embodiment, the redundancy in data communication is changed between the medium noise level period and the low noise level period. However, for example, the data transfer rate may be changed.

  In the above embodiment, the mode of data communication is changed corresponding to three types of noise periods, ie, a high noise level period, a medium noise level period, and a low noise level period. Any number may be used as long as the number is plural, and an appropriate mode of data communication may be set according to the type of the noise period.

  In the above embodiment, the noise period information for each noise generating device is fixed. However, an actual noise waveform is measured for each noise generating device, and the measurement result is reflected in the noise period information. May be performed.

  In the above embodiment, the noise period estimation unit is arranged in the communication master unit. On the other hand, the noise period estimation unit may be arranged outside the communication master unit, and for example, the noise period estimation information may be reported to the communication master unit by power line communication.

  In the above embodiment, the power window is exemplified as the noise generating device. However, other types of electrical equipment may be used.

  In the above embodiment, the system mounted on the vehicle is exemplified, but the present invention can be applied to a system mounted on a moving body other than the vehicle. Further, the present invention can be applied to a system other than the system mounted on the moving body.

  Note that the communication master unit in the above-described embodiment can be configured as a computer including a central processing unit (CPU) and the functions of the communication master unit can be realized by executing a program. These programs may be acquired in the form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in the form of delivery via a network such as the Internet. Good.

It is a block diagram which shows the schematic structure of a system provided with the communication master unit which is a communication control apparatus which concerns on one Embodiment of this invention. It is a block diagram for demonstrating the structure of the electrical equipment system of FIG. It is a block diagram for demonstrating the structure of an example of the noise generation apparatus of FIG. It is a figure for demonstrating the example of the noise generation accompanying operation | movement of the noise generation apparatus of FIG. It is a block diagram for demonstrating the structure of the communication master unit of FIG. It is a block diagram for demonstrating the structure of the noise period estimation part of FIG. It is a figure for demonstrating the memory content in the noise period information storage area of FIG. It is a figure for demonstrating the content of the noise period information of FIG. 7A. It is a figure for demonstrating the specific example of the noise period information of FIG. 7B. It is a block diagram for demonstrating the structure of the communication slave unit of FIG. It is a sequence diagram for demonstrating the data communication control operation example in the system of FIG.

Explanation of symbols

310 _j (j = 1, 2,...)... Noise generating device 720... Noise period estimation unit (detection means and estimation means)
730 ... Transmission processing unit (data transmission control means)
PWL ... Power wiring (power line)

Claims (11)

Detecting means for detecting a sign of the start of a noise generating operation by at least one noise generating device that causes noise to be superimposed on the communication path;
Estimating means for estimating a noise generation period based on a detection result by the detecting means;
For at least a portion of the period of the noise generation period estimated by the estimating means, and data transmission control means for stopping data transmission; equipped with,
The estimation means measures a noise generation mode associated with the operation of the noise generating device, and estimates the noise generation mode associated with the next operation of the noise generating device in consideration of the measured noise generation mode.
A communication control device. Communication performed via the communication path is power line communication,
The communication path is a power line.
The communication control apparatus according to claim 1.   The communication control apparatus according to claim 2, wherein the noise generating device is a device that receives supply of operating power via the power line.   The communication control apparatus according to any one of claims 1 to 3, wherein the sign of the start of the noise generation operation is generation of an operation start command of the noise generation device. The estimating means estimates a time transition of a noise generation amount in the noise generation period,
The data transmission control means stops the data transmission for a period during which the noise generation amount is estimated to exceed a first threshold.
The communication control apparatus according to any one of claims 1 to 4 , wherein The data transmission control means is configured to transmit the data transmission destination for a period during which it is estimated that a noise generation amount in the noise generation period other than the data transmission stop period exceeds a second threshold smaller than the first threshold. respect, to specify the second data redundancy is higher than the first data redundancy in a period other than the noise generation period, performs data transmission by the second data redundancy, it in claim 5, wherein The communication control device described. The communication control apparatus according to claim 1 , wherein the target data for data transmission is voice data. The communication control device according to claim 1 , wherein the communication control device is mounted on a mobile body. A detection step of detecting a sign of the start of a noise generation operation by at least one noise generation device that causes noise to be superimposed on the communication path;
An estimation step of estimating a noise generation period based on a detection result in the detection step;
For at least a portion of the period of the estimated the noise generation period in the estimation step, and a data transmission stop step of stopping the data transmission; equipped with,
In the estimation step, a noise generation mode associated with the operation of the noise generation device is measured, and the noise generation mode associated with the next operation of the noise generation device is estimated in consideration of the measured noise generation mode.
A communication control method characterized by the above. A communication control program for causing a calculation means to execute the communication control method according to claim 9 . 11. A recording medium in which the communication control program according to claim 10 is recorded so as to be readable by an arithmetic means.

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