JP2010273076A - Mobile tv receiver, receiving method of mobile tv receiver, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile TV receiver which changes antenna direction to the most appropriate direction in a current position even during moving without degradation of the receiving state. <P>SOLUTION: The mobile TV receiver is equipped with: a first antenna which is fixed so as to be rotatable; a first drive device which changes the direction of the first antenna; a tuner which receives TV broadcast through the first antenna; a second antenna which is fixed so as to be rotatable, a second drive device which changes the direction of the second antenna; and a receiving state measurement circuit which measures the receiving state through the second antenna. While the tuner receives TV broadcast through the first antenna that faces to a first direction, the second drive device changes the direction of the second antenna to a second direction different from the first direction, and the receiving state measurement circuit measures the receiving state in the second direction. According to the measurement result, the first drive device changes the direction of the first antenna. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to reception of radio waves at a mobile receiver, and more particularly, to reception of radio waves at a mobile TV receiver such as a one-segment mobile phone.

  In general, when viewing on a television receiver, in order to obtain good viewing quality, it is necessary to set the direction of the antenna in the direction in which the reception state is the best. In particular, unlike a stationary television receiver installed indoors, it is necessary to consider that a mobile TV receiver not only moves without moving at a specific location but also moves while moving with the user. There is.

  When the mobile television receiver receives while moving, the direction of the antenna for obtaining the best reception state changes according to the movement. With 1Seg TV, it is possible to obtain good viewing quality even when the antenna direction is not optimized when moving in an area where the electric field is strong due to the characteristics of digital broadcasting. When moving in a weak area, the user cannot watch television with good viewing quality unless the direction of the antenna is constantly adjusted.

  Patent Document 1 describes a mobile phone that measures the reception level in each direction while changing the direction of the antenna with a motor or the like, and then adjusts the direction of the antenna in the direction in which the reception level is highest in the measurement result. Yes. In this mobile phone, the antenna is automatically adjusted to the direction of the antenna in which the reception state is the best at the position where the reception level is measured. Therefore, the user needs to adjust the direction of the antenna to find the optimum direction. Absent.

JP 2000-174526 A

  In the mobile phone of Patent Document 1, when the reception level is moved from the measurement position, the optimum antenna orientation also changes. Therefore, in order to obtain the best reception state at the position after movement, it is necessary to measure the reception level in each direction again at the position after movement. In order to re-measure the reception level, the direction of the antenna is inevitably changed, and the antenna is pointed in the direction where the reception level is the lowest even temporarily.

  The present invention has been made in view of such a situation, and the problem to be solved by the present invention is that the antenna is positioned in the optimum direction at the position without degradation of the reception state even when moving. It is providing the mobile television receiver which changes the direction of the.

  In order to solve the above-described problems, the present invention includes, as one aspect thereof, a first antenna that is rotatably fixed to a casing of the mobile TV receiver, and a direction of the first antenna with respect to the casing A first driving device for changing the frequency, a tuner that receives a television broadcast via the first antenna, and a second antenna that is different from the first antenna and is rotatably fixed to the housing , A second driving device for changing the orientation of the second antenna with respect to the housing, and a reception state measurement circuit for measuring a reception state via the second antenna, the first direction The second driving device changes the direction of the second antenna to a second direction different from the first direction while receiving by the tuner via the first antenna facing the second direction. The reception status measurement measures the reception status in the direction. A mobile television receiver is provided in which the first driving device changes the direction of the first antenna according to the result of the determination.

  Further, the present invention provides, as another aspect, a first antenna that is rotatably fixed to the casing of the mobile television receiver, and a first antenna for changing the orientation of the first antenna with respect to the casing. 1, a tuner that receives a television broadcast via the first antenna, a second antenna that is different from the first antenna and is rotatably fixed to the housing, and a housing A mobile television receiver comprising a second driving device for changing the orientation of the second antenna with respect to the body and a reception state measurement circuit for measuring a reception state via the second antenna, While receiving at the tuner via the first antenna facing the direction 1, the second drive device changes the direction of the second antenna to a second direction different from the first direction, The reception state measurement measures the reception state in the second direction. According to the measurement result, there is provided a receiving method for a mobile television receiver, wherein the first driving device changes the direction of the first antenna.

  Further, the present invention provides, as another aspect, a first antenna that is rotatably fixed to the casing of the mobile television receiver, and a first antenna for changing the orientation of the first antenna with respect to the casing. 1, a tuner that receives a television broadcast via the first antenna, a second antenna that is different from the first antenna and is rotatably fixed to the housing, and a housing Control of a mobile television receiver comprising a second driving device for changing the orientation of the second antenna with respect to the body and a reception state measurement circuit for measuring a reception state via the second antenna. This is a program to be executed, and while the tuner is receiving via the first antenna facing the first direction, the second drive device defines the direction of the second antenna as the first direction. Change to a different second direction, There is provided a program characterized in that a reception state measurement measures a reception state in a direction and causes a computer to execute a procedure in which the first drive device changes the direction of the first antenna in accordance with the measurement result.

  According to such a mobile television receiver, the reception state in the second direction using the second antenna even while the first antenna is directed in the first direction and the television broadcast is being received. Can be measured. Therefore, it is possible to measure the reception state in the other direction without affecting the reception state via the first antenna.

It is a figure for demonstrating reception of the 1 seg electric wave 5 by the mobile phone 1 for 1 seg which is one embodiment of this invention. 1 is a block diagram of a one-segment mobile phone 1. FIG. 4 is a flowchart for explaining the operation of the one-segment mobile phone 1. 4 is a flowchart for explaining the operation of the one-segment mobile phone 1.

  A one-segment mobile phone 1 (hereinafter sometimes referred to as a mobile phone 1) according to an embodiment of the present invention will be described. As shown in FIG. 1, the mobile phone 1 receives a one seg broadcast with a built-in one seg tuner and displays a one seg viewing screen on the LCD screen 2. As an antenna for receiving the one seg broadcast, a one seg antenna 3, A detection antenna 4 is provided. The one-seg antenna 3 and the detection antenna 4 have the same directivity, and the angle of both antennas can be changed by a motor controlled by the control device of the mobile phone 1.

  In general, when a person (user) carrying the mobile phone 1 moves while receiving the one-seg radio wave 5 by the one-seg antenna 3, the reception state changes with the movement. When the user moves to an area where the one-seg radio wave 5 is weak, the reception state may be deteriorated depending on the directivity and angle of the one-seg antenna 3.

  In order to avoid such deterioration of the reception state of the one-segment antenna 3, the angle at which the reception electric field increases by periodically rotating the detection antenna 4, that is, the high-sensitivity antenna angle is obtained. The one-segment antenna 3 is rotated so that the sensitivity antenna angle is obtained.

  Thereby, the one-seg reception state can always be maintained in the best state without repeating fine adjustment of the one-seg antenna 3.

  Next, the one-segment mobile phone 1 will be described in more detail with reference to FIG. The mobile phone 1 includes stepping motors 6 and 7, one-segment tuners 8 and 9, and a control circuit 10 in addition to the above-described LCD screen 2, one-segment antenna 3, and detection antenna 4. The one-seg tuner 9 includes an electric field strength measurement circuit 11 as a circuit for measuring the electric field strength of the one-seg radio wave 5.

  The one-seg antenna 3 that receives the one-seg radio wave 5 is rotated by a stepping motor 6 so that the angle can be changed. The stepping motor 6 rotates the one-segment antenna 3 under the control of the control circuit 10. The one-seg tuner 8 tunes the one-seg radio wave 5 received via the one-seg antenna 3.

  The detection antenna 4 having the same directivity as the one-segment antenna 3 is rotated by a stepping motor 7 so that the angle can be changed. The stepping motor 7 rotates the detection antenna 4 under the control of the control circuit 10.

  The reception of the one-segment broadcasting performed via the one-segment antenna 3 and the one-segment tuner 8 is performed independently of the operation state of the detection antenna 4 and the one-segment tuner 9. For this reason, even during the reception of one-segment broadcasting, the entire circumference of the electric field intensity can be measured by the detection antenna 4 while maintaining the reception state.

  The angle and direction of the detection antenna 4 can be freely changed by a stepping motor 7. The control circuit 10 measures the electric field strength of the one-seg radio wave 5 by the radio wave intensity measuring circuit 11 while rotating the detection antenna 4 according to an arbitrary program set in advance. Based on the correspondence relationship between the angle and the electric field strength acquired in this way, the control circuit 10 obtains the angle at which the electric field strength is maximum as the high sensitivity antenna angle.

  Next, the control circuit 10 controls the stepping motor 6 so that the angle of the one-segment antenna 3 becomes a high sensitivity antenna angle. As a result, the one-seg antenna 3 is directed in the direction in which the reception state of the one-seg radio wave 5 is optimal in the detection antenna 4 having the same directivity, so that reception by the one-seg tuner 8 via the one-seg antenna 3 is performed. The state is also optimized. Note that several types of rotation angles and periods of the detection antenna 4 are programmed in advance and may be selected by the user.

  The operation of the one-segment mobile phone 1 will be described with reference to FIG.

  In order to start viewing one-seg broadcasting, the user performs a predetermined operation with an input device such as a numeric keypad of the mobile phone 1 to activate the one-seg reception function (step S1), and arbitrarily sets the one-seg antenna 3 with his / her hand. Pull out at an angle (step S2).

  Here, the quality of the viewing state is determined (step S3). This determination may be made by the user looking at the LCD screen. In this case, when it is determined that the viewing state is bad, the user performs a predetermined operation via the input device, and causes the control circuit 10 to execute processing subsequent to step S7 described later.

  Alternatively, similarly to the one-segment tuner 9, the one-segment tuner 8 may be provided with an electric field strength measurement circuit, and the control circuit 10 may compare and determine the measured value of the electric field strength measurement circuit and a predetermined threshold value. When the control circuit 10 determines that the reception state is inferior based on the measurement value of the electric field strength measurement circuit, the control circuit 10 proceeds to step S7 described later.

  When the user determines that the viewing state is good and does not perform a predetermined operation, or when the control circuit 10 determines that the viewing state is good, the control circuit 10 rotates both the one-segment antenna 3 and the detection antenna 4. The reception of the one-segment radio wave 5 and the display on the LCD screen 2 are continued (step S4).

  The control circuit 10 determines whether or not a predetermined operation for ending viewing of the one-segment broadcasting is performed within a predetermined time (step S5). When the operation is performed, the control circuit 10 ends the reception by the one-segment tuner 8 (step S6). If no operation is performed, the process returns to step S3.

  When it is determined in step S3 that the viewing state is inferior, the control circuit 10 measures the electric field intensity with the electric field intensity measurement circuit 11 while rotating the detection antenna 4 once with the stepping motor 7 (step S7). (Step S8), the angle of the detection antenna 4 that maximizes the electric field strength is obtained as the high sensitivity antenna angle (step S9). Here, as an example of a program for the control circuit 10 to control the stepping motor 7 and the electric field strength measuring circuit 11, the detection antenna 4 is rotated by a predetermined angle, and the electric field strength at that angle is transferred to the electric field strength measuring circuit 11. The process of storing the rotation angle and the electric field strength at this time in a storage device (not shown) is repeated until the detection antenna 4 makes one rotation, and then the rotation angle at the time when the electric field strength is maximum is determined with high sensitivity. An antenna angle can be considered. The angle at which the detection antenna 4 is rotated for each measurement may be fixed to a specific value, or may be an angle selected according to a user operation.

  When the high-sensitivity antenna angle is obtained in this way, the control circuit 10 rotates the one-seg antenna 3 using the stepping motor 6 so that the one-seg antenna 3 becomes the high-sensitivity antenna angle (step S10).

  In the first embodiment, the field strength measurement for each angle by the detection antenna 4, the stepping motor 7, and the field strength measurement circuit 11 and the determination of the high sensitivity antenna angle are performed according to the user's operation in step S3 or for a certain period of time. Performed every time. In these operations, when the reception state changes suddenly, the reception state remains inferior until a user operation is required or a certain time elapses.

  On the other hand, in this embodiment, the detection antenna 4 is always rotated to measure the electric field strength for each angle, and when an angle higher than the electric field strength at the current angle is found, the one-seg antenna 3 is immediately set at that angle. It is different in that it rotates.

  With reference to FIG. 4, another operation of the one-segment mobile phone 1 will be described. Compared with the flowchart of FIG. 3, the flowchart of FIG. 4 differs in that steps S11 to S14 are added. Steps S1 to S10 are the same as those in the first embodiment, and therefore, the newly added steps will be mainly described here.

  When the mobile phone 1 activates the one-segment broadcasting reception function and views the one-segment broadcasting, the detection antenna 4 always rotates, and the electric field strength measured at every predetermined angle and the one-segment antenna 3 are currently facing. The electric field strength at the angle is compared (step S11). Here, when an electric field larger than the electric field strength at the angle at which the one-segment antenna 3 is currently facing is detected (step S12), the control circuit 10 updates the electric field strength as the current maximum strength (step S13). The one-seg antenna 3 is rotated toward the angle at which the detection antenna 4 detects the electric field (step S14).

  Although the present invention has been described with reference to the embodiments and examples, the present invention is not limited to these, and it is obvious to those skilled in the art that changes can be made within the technical scope of the invention. Will.

  For example, in the above-described embodiments and examples, the electric field strength measurement circuit is used as a means for determining the reception state. Instead, the carrier / noise ratio of the received one-segment broadcasting is measured and this measurement is performed. The reception state may be determined based on the value. Alternatively, the reception state may be determined using the number of error corrections by an error correction circuit (not shown) as an index.

  In the above description, the one-seg tuner 8 connected to the one-seg antenna 3 has not been described as including a field strength measurement circuit, a carrier / noise ratio measurement circuit, an error correction circuit, and the like. The one-segment tuner 8 may be provided, and the measurement values obtained by these circuits may be compared with a predetermined threshold value by the control circuit 10 and the operations from step 7 to step S10 in FIG. 3 may be performed according to the comparison result.

DESCRIPTION OF SYMBOLS 1 1Seg corresponding mobile phone 2 LCD screen 3 1Seg antenna 4 Detection antenna 5 1Seg radio wave 6, 7 Stepping motor 8, 9 One Seg tuner 10 Control circuit 11 Electric field strength measurement circuit

Claims (15)

A first antenna rotatably fixed to the casing of the mobile television receiver;
A first drive for changing the orientation of the first antenna relative to the housing;
A tuner for receiving a television broadcast via the first antenna;
A second antenna that is different from the first antenna and is rotatably fixed to the housing;
A second drive device for changing the orientation of the second antenna relative to the housing;
A reception state measurement circuit for measuring a reception state via the second antenna,
While receiving at the tuner via the first antenna facing the first direction, the second driving device has a second antenna whose direction is different from that of the first direction. The reception state measurement measures the reception state in the second direction, and the first driving device changes the direction of the first antenna according to the measurement result. Mobile TV receiver.   The second driving device directs the second antenna in each of a plurality of directions, the reception state measurement means measures the reception state in each of the plurality of directions, and the reception state measured among the plurality of directions. The mobile TV receiver according to claim 1, wherein the first driving device changes a direction of the first antenna in accordance with the best direction.   According to the reception state of the tuner, the second driving device changes the direction of the second antenna to the second direction, and the reception state measurement circuit measures the reception state in the second direction. The mobile television receiver according to claim 1, wherein   The tuner includes at least one of means for measuring electric field strength and means for measuring a ratio of carrier to noise, and determines the reception state based on a measurement result of at least one of the measurement means. The mobile television receiver according to claim 3.   The tuner is a tuner for receiving a digital broadcast, and includes means for counting the number of times error correction has been performed, and the reception state is determined based on a result of the counting. 5. The mobile television receiver according to any one of 4 above. A first antenna rotatably fixed to the casing of the mobile television receiver;
A first drive for changing the orientation of the first antenna relative to the housing;
A tuner for receiving a television broadcast via the first antenna;
A second antenna that is different from the first antenna and is rotatably fixed to the housing;
A second drive device for changing the orientation of the second antenna relative to the housing;
Using a mobile television receiver comprising a reception state measurement circuit for measuring a reception state via the second antenna,
While receiving at the tuner via the first antenna facing the first direction, the second driving device has a second antenna whose direction is different from that of the first direction. The reception state measurement measures the reception state in the second direction, and the first driving device changes the direction of the first antenna according to the measurement result. , Mobile TV receiver reception method.   The second driving device directs the second antenna in each of a plurality of directions, the reception state measurement means measures the reception state in each of the plurality of directions, and the reception state measured among the plurality of directions. The receiving method for a mobile television receiver according to claim 6, wherein the first driving device changes the direction of the first antenna in accordance with the best direction.   According to the reception state of the tuner, the second driving device changes the direction of the second antenna to the second direction, and the reception state measurement circuit measures the reception state in the second direction. A receiving method for a mobile television receiver according to any one of claims 6 and 7.   The tuner includes at least one of means for measuring electric field strength and means for measuring a ratio of carrier to noise, and determines the reception state based on a measurement result of at least one of the measurement means. The method for receiving a mobile television receiver according to claim 8.   9. The tuner according to claim 8, wherein the tuner is a tuner for receiving a digital broadcast, and includes means for counting the number of times error correction has been performed, and the reception state is determined based on a result of the counting. 10. A receiving method for a mobile television receiver according to any one of 9 above. A first antenna rotatably fixed to the casing of the mobile television receiver;
A first drive for changing the orientation of the first antenna relative to the housing;
A tuner for receiving a television broadcast via the first antenna;
A second antenna that is different from the first antenna and is rotatably fixed to the housing;
A second drive device for changing the orientation of the second antenna relative to the housing;
A program for causing a computer to execute control of a mobile television receiver including a reception state measurement circuit for measuring a reception state via the second antenna,
While receiving at the tuner via the first antenna facing the first direction, the second driving device has a second antenna whose direction is different from that of the first direction. 2, the reception state measurement measures the reception state in the second direction, and according to the measurement result, the first driving device executes a procedure for changing the direction of the first antenna to the computer A program characterized by letting   The second driving device directs the second antenna in each of a plurality of directions, the reception state measurement means measures the reception state in each of the plurality of directions, and the reception state measured among the plurality of directions. The program according to claim 11, wherein the computer causes the computer to execute a procedure of changing the direction of the first antenna according to the best direction.   The second drive device changes the direction of the second antenna to the second direction according to the reception state of the tuner, and the reception state measurement circuit measures the reception state in the second direction. 13. The program according to claim 11, wherein the program is executed by a computer.   The tuner includes at least one of means for measuring electric field strength and means for measuring a ratio of carrier to noise, and a procedure for determining the reception state based on a measurement result of at least one of the measurement means is stored in a computer. The program according to claim 13, wherein the program is executed.   The tuner is a tuner for receiving a digital broadcast, and includes means for counting the number of times error correction has been performed, and causes a computer to execute a procedure for determining the reception state based on the counting result. The program according to any one of claims 13 and 14.

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