JP2006041857A - On-vehicle digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem, in which even though a program table of digital broadcasting can be displayed efficiently by storing the program information transmitted to display the program table when a user does not view, for example, when the power source is turned off, an on-vehicle receiver is unable to freely perform the storing operation since the battery is consumed for the storing operation. <P>SOLUTION: The on-vehicle receiver is equipped with a storage means, which is automatically actuated when the engine is set OFF to store program table information, a power circuit which operates in a battery-driven environment of an automobile vehicle, a mobile telephone, etc., to share the electric power of the battery with parts other than the digital receiver, a means of grasping the remaining capacity of the battery from the state of the battery and the power consumption of the on-vehicle receiver, and a control means of storing program array information, only when the battery has sufficient remaining power. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital broadcast receiver that receives a digital broadcast.

Conventionally, digital broadcasting that transmits video signals digitally compressed by the MPEG system has been put into practical use, and broadcasting of television, radio, and data has been performed. However, program sequence information is multiplexed on the video and audio signals. Has been sent out. This program arrangement information can be used to display as a program guide. For home digital broadcast receivers, when users are watching analog broadcasts and videos, etc., when they are not using digital receiver video and audio, or when the power is turned off When the user performs an operation to display a program guide with a remote control transmission device or the like, it is possible to display desired program information immediately (for example, patents) Reference 1).
Japanese Patent Application Laid-Open No. 07-193762

  Conventionally, digital broadcast receivers for home use automatically start up and store when the power is turned off, but in-vehicle digital receivers are battery-operated, so that Thus, there is a problem that if the battery is automatically started and accumulated, the battery will eventually run out and it will become impossible to run.

  An object of the present invention is to provide a digital broadcast receiver capable of accumulating program sequence information even when driven by a battery.

  A digital broadcast receiver according to claim 1 of the present invention operates in a battery-powered environment such as an automobile vehicle or a mobile phone, and stores digitally receiving means that automatically starts and stores program guide information while the engine is off. The power supply circuit that shares the battery power with the parts other than the machine, the means to grasp the remaining capacity of the battery from the state of the battery and the power consumed by itself, and the program arrangement information only when the remaining power of the battery is sufficient And control means for controlling to perform the accumulation operation.

  According to a second aspect of the present invention, there is provided a digital broadcast receiver having the configuration of the digital broadcast receiver according to the first aspect, the communication means for communicating with a battery charging device or a charge control microcomputer built in the battery, It is characterized by grasping the remaining capacity of the battery using a communication means.

  According to the present invention, even in a battery-powered in-vehicle digital broadcast receiver with limited power, program sequence information can be stored when the engine is turned off, which is the same as a home-use fixed digital broadcast receiver. The program guide can be displayed at any time.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiver according to Embodiment 1 of the present invention.

  In FIG. 1, 100 is a digital broadcast receiver, 101 is a main circuit containing a receiving relationship and a main microcomputer, 102 is a sub circuit containing a sub-microcomputer, 1 is one frequency channel selected from an RF signal and is demodulated and Receiving unit that performs error correction, 2 is a descrambling unit, 3 is a demultiplexing unit that separates the transport stream (hereinafter referred to as TS), which is descrambled received data, into each medium, and 4 is demultiplexed by the demultiplexing unit 3 An MPEG decoder for decoding the video data and the audio data, 51 an OSD (On Screen Display) for video encoding the video signal from the MPEG decoder 4, and a DAC (Digital Analog) for DA converting the audio signal from the MPEG decoder 4 Conver er), 201 is a TV receiver, 6 is a main microcomputer for generating bitmap data of a program guide from the program arrangement information and receiving control, 61 is a ROM for storing a program, 62 is a RAM, 62 is a program information arrangement, etc. , 301 is an input operation control unit, 7 is a sub-microcomputer that operates to control the power supply of the main microcomputer, 71 is a ROM storing a program of the sub-microcomputer, 72 is a RAM used by the sub-microcomputer, 601 Is an ACC (accessory) power source to which a power supply of 12 V that is turned on / off by an engine key is input, 602 is a + B power source that is always supplied with 12 V, and 603 and 604 are power supply switches to a main circuit controlled by a sub-microcomputer. Is a main circuit power supply switch for viewing, and 604 is a main circuit power supply for storage. Switch.

  The main circuit 102 is a circuit that accommodates the receiving unit 1, the descrambling unit 2, the demultiplexing unit 3, the MPEG decoder 4, the DAC 5, the main microcomputer 6, the OSD 51, the input control unit 301, and their peripheral circuits. It is a circuit that houses the sub-microcomputer 7 and peripheral circuits.

  Next, the operation will be described. An RF signal is input to the receiver 1 from an antenna for digital terrestrial broadcasting (not shown in the figure), and one frequency channel is selected. The receiver 1 performs demodulation and error correction, and becomes a TS signal. The TS output from the receiving unit 1 is descrambled by the descrambling unit 2. A plurality of TSs exist in one frequency channel, but the descrambling unit 2 descrambles the TS of the program selected by the user, and performs descrambling processing on the other TSs. Output without any output. The TS output from the descrambling unit 2 is separated into each medium by the demultiplexing unit 3.

  The TS to be separated by the demultiplexing unit 3 is the TS of the program selected by the user, and other TSs are not processed by the demultiplexing unit 3. The video data and audio data separated by the demultiplexing unit 3 are decoded by the MPEG decoder 4, the video signal is output to the OSD 51, and the audio signal is output to the DAC 52. In the OSD 51, the video signal from the MPEG decoder 4 is video-encoded and output as an analog video signal from the digital broadcast receiver 101. The DAC 52 DA-converts the audio signal from the MPEG decoder 4 and outputs it as an analog audio signal. As a result, the analog audio signal is output from the digital broadcast receiver 101. The analog video signal and audio signal output from the digital broadcast receiver 101 are displayed on the TV receiver 201.

  The demultiplexing unit 3 also separates the program arrangement information and inputs it to the main microcomputer 6. The input program arrangement information is temporarily stored in the nonvolatile memory 63. The input / output operation control unit 301 receives an operation performed by the user's remote controller using infrared rays and notifies the main microcomputer 6 of the operation. When the user performs a program guide display operation using the remote controller, the main microcomputer 6 detects this through the input control unit 301 and outputs the program guide to the OSD 51 based on the program arrangement information stored in the nonvolatile memory 63. The OSD 51 outputs a video signal in which the display of the program guide is superimposed on the video signal output from the MPEG2 decoder 4, and this is displayed on the TV receiver 201.

  Next, basic power control when the sub-microcomputer 7 stores program sequence information will be described.

  When the engine of the car equipped with the digital broadcast receiver is turned on and the power of the digital broadcast receiver is on, 12V is supplied to both the accessory power supply 601 and the + B power supply 602, and the main circuit 102 is driven by an accessory power source 601, and the sub-circuit 103 is driven by a + B power source 602.

  When the engine is turned off, the accessory power supply 601 is turned off and the operation of the main circuit is stopped. However, since the + B power supply is continuously supplied, the sub microcomputer 7 of the sub circuit 802 continues to operate.

  When storing the program sequence information when the engine is off, the sub-microcomputer 7 turns on the power supply switch 603 to supply the power from the + B power source to the main circuit and activate the main circuit. The main microcomputer performs the accumulation operation according to the instructions of the sub microcomputer.

  FIG. 2 is a block diagram showing a circuit around the in-vehicle digital broadcast receiver and the battery in the vehicle according to Embodiment 1 of the present invention.

  In the figure, 90 is an engine, 91 is a generator, 92 is a fan belt, 93 is a battery, and 901 is an engine key. The accessory power source 601, the + B power source 602, and the digital broadcast receiver 101 are the same as those shown in FIG. 1.

  Next, the operation will be described. During running, the engine 90 is started by turning on the engine key 93. The rotation of the engine is transmitted to the generator 91 by the fan belt 92, and electric power is generated by the rotational energy. The electric power generated by the generator 91 is input to the battery 93 and charged. A voltage of 12 V is output from the battery 93, connected to the accessory power source 94 via the + B power source 602 and the switch 901, and power is supplied to the digital broadcast receiver 101. The switch 901 is turned on only when the engine is started with the engine key, and 12V is applied to the ACC power source 601 only when the engine is started. When the engine is stopped, the power from the generator 91 is stopped and the charging of the battery 92 is also stopped. At this time, since the switch 901 is off, the 12V supply to the ACC power source 601 is cut off. However, since the + B power source 602 is directly connected to the battery, it is continuously supplied even when the engine is off.

  FIG. 3 is a graph showing changes in battery power consumption due to storage operation and charging according to Embodiment 1 of the present invention.

  In FIG. 3, X-axis 1 is the time axis, X-axis 2 is the engine state, Y-axis is the remaining battery power, P1 to P4 are the remaining battery power on the Y-axis, and P1 is the full charge state power value of the battery , P2 represents an accumulated operation limit power value, P3 represents a travel operation limit power value, and P4 represents zero power. T0 to T16 represent times on the X axis.

  Next, the operation will be described. At time T0, the engine is off, and the remaining battery power is P1, indicating that the battery is fully charged. The switch 604 is kept off by the program stored in the ROM 71 connected to the sub-microcomputer 7 from time T0 to time T1, and no power is supplied to the main circuit 102. Although power is always supplied to the sub-circuit 103, the power consumption of the sub-circuit is very small.

  From time T1 to time T2, while the accumulation operation is being performed, the switch 604 is turned on by the sub-microcomputer 7 and power supply to the main circuit 102 is started. Since the main circuit 102 consumes a lot of power such as a main microcomputer and a tuner-related circuit, the remaining power of the battery is consumed from P1 to P1 'by one accumulation operation. The power consumption rate of the power consumed by the accumulation is obtained by “(P1−P1 ′) ÷ (T2−T1)”, and this is hereinafter referred to as a power consumption rate α. When this α is used, the power consumption required for accumulation is obtained by “(time required for accumulation × α)”.

  In this graph, the accumulation operation is performed periodically without starting the engine and charging the battery thereafter, and T1-T2, T3-T4, T5-T6, T7-T8, T9-T10, T11-T12, T13. The power storage operation at T14 is “((T2−T1) + (T4−T3) + (T6−T5) + (T8−T7) + (T10−T9) +”. (T12−T11) + (T14−T13)) × α ″, and when this value is subtracted from P1, the remaining battery power at that time is determined. At time T14, since the remaining battery power reaches the storage operation limit power value P2, the storage operation that is periodically performed is stopped to prevent the engine from becoming inoperable.

  At time T15, the engine is turned on and charging is started. In this graph, the battery charging is completed in the period from T15 to T16, and β is obtained by “(P1−P2) ÷ (T16−T15)” where the slope at this time is the charging rate β.

  In the present embodiment, this graph is obtained by calculation at the design stage or measurement by an actual circuit. From the graph, the storage power consumption rate α, the battery charge rate β, the full charge state power value P1, and the storage operation limit power value P2 are determined and stored in the ROM 71 connected to the sub-microcomputer 7 as constants used by the program.

  The stored operation limit power value P2 is larger than the travel operation limit power value P3, which is a power value that actually supplies power necessary for engine and car operation. In consideration of a decrease in the full charge state power value of the battery due to the above, a change in the amount of power with respect to a temperature change, etc., a sufficient margin is set so that P2 has a margin with respect to P3.

  4 is a list of ROMs and RAMs used in the flowcharts of FIGS. 5 and 6 to be described later according to the first embodiment of the present invention, FIG. 5 is a flowchart of processing when the engine is on, and FIG. 6 is a flowchart of processing when the engine is off. is there.

  4, the ROM is a constant value stored in the ROM 71 shown in FIG. 1, and is referred to when the sub-microcomputer 7 executes the program code stored in the ROM 71. The RAM is the same as that shown in FIG. And is used when the sub-microcomputer 7 executes the program code stored in the ROM 71. Also, TM1 is an accumulation cycle when repeatedly accumulating when the engine is off, α is a power consumption rate during accumulation that represents the power consumed per second when accumulating when the engine is off, and β is when charging when the engine is on Charging rate during charging, which represents the power charged per second, P1 is the full charge state power value that represents the remaining power when the battery shakes, and P2 is required for the vehicle equipped with the digital receiver to run Storage operation limit power value representing a threshold value for limiting the storage operation to leave a large amount of power, TC1 is a storage cycle counter for counting the time until the next storage, and TC2 is performing a storage operation An accumulation operation time counter for measuring time, POW represents a current battery power value for holding the remaining battery power.

  Next, the control of the present invention will be described with reference to the flowcharts shown in FIGS.

  FIG. 5 is a flowchart showing the engine-on process according to Embodiment 1 of the present invention. Activated when the sub-microcomputer is activated when the engine is on, or when the engine is turned off. When the engine is on, as described in the description of FIG. 2, the generator 91 is activated by the power of the engine 90 to charge the battery 93. The main process for the engine-on process is to update the current battery power value POW. .

  In the process S1, the current battery power value POW and the full charge state power value P1 are compared. When the battery is not in the full charge state, the process proceeds to the process S2. In the process S2, the 1-second WAIT process is performed. The amount of power charged in is obtained at the charging rate β × 1 second during charging, and this is added to POW, and the processes of S1, S2, and S3 are repeated until the battery is fully charged. With this process, the remaining power of the battery when the engine is on can always be held at POW.

  FIG. 6 is a flowchart showing the engine-off time process according to Embodiment 1 of the present invention. The process S20 is a branch process for comparing the current battery power value POW and the storage operation limit power value P2, the process S21 is a 1-second WAIT process, the process 22 is a process for initializing the storage period counter with zero, and the process 23 is a storage period counter. A process for comparing TC1 and the accumulation cycle TM1, a process 24 is a 1-second WAIT process, a process 25 is a process for adding 1 to the accumulation period counter, and a process 26 is to turn on the switch 604 to turn on the power of the main circuit 102. Processing for instructing the microcomputer to start storage, processing S27 is processing for initializing the storage operation time counter TC2 to zero, processing 28 is a branch processing for checking completion of the storage processing of the main microcomputer, processing 29 is 1-second WAIT processing, The process 30 is a process of adding 1 to the accumulation operation time counter TC2, and the process 31 is the main operation with the switch 604 turned off. Processing to power off the road 102, the processing step S32 processing for subtracting the current battery power value POW power consumed by the accumulation processing, the processing S33 is determining processing branches whether the engine turned off.

  The engine-off process is started when the sub-microcomputer is started when the engine is turned off, or when the engine is switched from the engine-on state to the engine-off state, and the main process is to perform the accumulation process periodically as the battery allows. . First, the remaining capacity of the battery is checked in processing 20 and below. In process S20, it is determined whether or not the remaining battery capacity is within the range in which the storage operation is possible by comparing the current battery power value POW and the storage operation limit power value P2. When NO is determined in S20, it is determined that the remaining power is insufficient, and the accumulation operation is not performed, and an infinite loop of the process S21 1-second WAIT and the process S33 engine-off determination process is performed. Next, a WAIT process for creating an interval for starting the accumulation cycle is performed after the process S22.

  In step S22, the accumulation cycle counter is cleared to zero, and a WAIT process for the accumulation cycle TM1 second is performed in a loop of steps S23, S24, and S25. Next, the activation of the accumulation process and the measurement of the processing time are performed after the process S27. In step S26, the power source of the main circuit 102 is turned on. In step S27, the accumulation operation time counter TC2 is cleared to zero. In steps S28, S29, and S30, a loop process is performed until the accumulation process of the main microcomputer is completed. When the process S28 is exited with YES, the time required for accumulation is stored in the accumulation operation time counter TC2. In step S30, the main circuit 102 is powered off.

  Next, the current battery power value is updated from the power consumed in the accumulation process. Since the power consumed by the accumulation is obtained by the product of the accumulation operation time counter TC2 and the accumulation power consumption rate α, “POW−TC2 × α” is substituted for the current battery power value POW in the process S32. Next, in step S33, it is determined whether or not the engine is off. If it is off, the process loops first, and if it is on, the engine on process is started. As described above, the accumulation process performed when the engine is turned off can be stopped before the battery is exhausted and the vehicle cannot run.

(Embodiment 2)
FIG. 7 is a block diagram showing an in-vehicle digital broadcast receiver and a circuit around a battery in the vehicle according to Embodiment 2 of the present invention.

  In the figure, an engine 90, a generator 91, a fan belt 92, a battery 93, an engine key 901, an accessory power source 601, a + B power source 602, a digital broadcast receiver 101, and a television receiver 201 are the same as those in FIG. The sub-microcomputer 7 is the same as that shown in FIG.

  94 is a battery charge control device. The battery charge control device always grasps the remaining power of the battery by constantly grasping the state of the battery and the state of charge. In the first embodiment, the sub-microcomputer 7 grasps the remaining capacity of the battery by calculation. However, in the second embodiment, the sub-microcomputer 7 communicates with the battery charge control device 94, thereby remaining the battery. Capacity can be grasped by calculation.

  Regarding the operation, in the processing of FIGS. 5 and 6, there is a difference that communication is performed with the battery charge control device 94 when the current battery power value POW is referred to, but the other portion is a shaking process.

  The digital broadcast receiver according to the present invention can perform program sequence information storage processing when the engine is turned off even in a battery-powered on-vehicle digital broadcast receiver with limited power. A program guide similar to that of a receiver can be displayed at any time, and is useful not only for in-vehicle digital receivers but also for battery-powered digital receivers such as portable receivers in general.

1 is a block diagram showing the configuration of a digital broadcast receiver in Embodiment 1 of the present invention. 1 is a block diagram relating to the power supply of a vehicle in Embodiment 1 of the present invention. Graph on battery power in Embodiment 1 of the present invention The figure which shows the list of ROM and RAM in Embodiment 1 of this invention Flowchart of engine-on time process in Embodiment 1 of the present invention Flowchart of engine-off time processing in Embodiment 1 of the present invention Block diagram related to the power supply of the vehicle in the second embodiment of the present invention

Explanation of symbols

100 digital broadcast receiver 101 main circuit (reception related, main microcomputer)
102 Sub circuit (sub microcomputer)
DESCRIPTION OF SYMBOLS 1 Receiving part 2 Descramble part 3 Demultiplexing part 4 MPEG decoder 51 OSD (On Screen Display)
52 Voice DAC (Digital Analog Converter)
201 TV receiver 6 Main microcomputer 61 Main microcomputer ROM
62 RAM of main microcomputer
63 Non-volatile memory 301 Input operation control unit 7 Sub microcomputer 71 ROM of sub microcomputer
72 Sub-microcomputer RAM
601 ACC (accessory) power supply 602 + B power supply 603 Main circuit power supply switch (for viewing)
604 Main circuit power supply switch (for storage)
90 Engine 91 Generator 92 Fan belt 93 Battery 94 Battery charge controller 901 Engine key

Claims (2)

Storage means for automatically starting and storing program guide information while the engine is off, and a power supply circuit that operates in a battery-powered environment such as an automobile or a mobile phone and shares battery power with parts other than the digital receiver A means for grasping the remaining capacity of the battery from the state of the battery and the power consumption consumed by the battery; and a control means for controlling the program arrangement information to be stored only when the remaining battery power is sufficient. An in-vehicle digital broadcast receiver characterized by the above. The in-vehicle digital broadcast receiver according to claim 1, wherein a communication unit that communicates with a battery charging device or a charge control microcomputer built in the battery, and the remaining capacity of the battery is ascertained using the communication unit.

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