JPWO2008050387A1 - Receiving device, method thereof, program thereof, and recording medium thereof - Google Patents

Abstract

When it is determined that the received signal selected by the antenna switching unit 130 from the plurality of received signals received by the plurality of antennas is not appropriate, the control unit 120A receives the signal selected by the antenna switching unit 130. The signals are sequentially switched to determine the optimum reception signal and cause the antenna switching unit 130 to select the optimum reception signal. On the other hand, during the period of the optimum reception signal selection process, the decoding unit 143A stores the decoding result that would have been obtained if the decoding unit 143A performed the demodulated data DMD related to the optimum reception signal in the storage unit 144. Estimate based on recent decoding results. Based on the estimation result, sound is output from the sound output unit 160 and an image is displayed on the display unit 170. As a result, it is possible to appropriately reproduce the video or audio performed by receiving the broadcast wave with a simple configuration.

Description

  The present invention relates to a receiving device, a receiving processing method used in the receiving device, a receiving processing program for executing the receiving processing method, and a recording medium on which the receiving processing program is recorded.

  2. Description of the Related Art Conventionally, broadcast wave receivers such as televisions and radios are mounted on many moving bodies such as vehicles. Such a receiving apparatus includes an antenna that receives a broadcast wave. Recently, in order to improve anti-fading characteristics and the like, a technique that includes a plurality of antennas and performs diversity reception has attracted attention.

  As a technology of a receiving apparatus that performs such diversity reception, a reception signal from an antenna that is receiving the best broadcast wave among a plurality of antennas is selected, and video and audio are reproduced and output based on the selected reception signal. A technique has been proposed (see Patent Document 1: hereinafter referred to as “conventional example”). In this conventional example, an FFT of a broadcast wave which is an Orthogonal Frequency Division Multiplex (hereinafter also referred to as “OFDM”) signal to which a guard interval is added in order not to give the viewer (user) a sense of incongruity. (Fast Fourier Transform) In a period other than the window period, reception signals selected from a plurality of reception signals from a plurality of antennas are sequentially switched, and the respective signal powers are compared. Based on the result of this comparison, a received signal from the antenna having the highest signal power is selected.

Japanese Patent No. 3793448

  In the conventional technique described above, received signals from a plurality of antennas are switched during periods other than the FFT window period, and signal levels are compared. Then, in accordance with the comparison result, a received signal from the antenna to be selected within the FFT window period is determined.

  For this reason, in the technology of the conventional example, the level of the signal received by each antenna is compared in a limited period different from the actual processing target period other than the FFT window period in which the FFT processing is to be performed. Along with the erroneous detection, there is a possibility of making an erroneous determination when determining the optimum received signal from the antenna. For this reason, there is a demand for a technique that can determine the optimum received signal from the antenna based on the detection result of the level of the signal received by each accurate antenna without giving the user a sense of incongruity. It was rare. 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 provides a receiving apparatus and a reception processing method that can appropriately perform reproduction of video or audio performed by receiving broadcast waves with a simple configuration. With the goal.

  From a first aspect, the present invention is a receiving device that receives broadcast waves and reproduces at least one of video and audio, and includes antenna means having a plurality of antennas; a plurality of antennas received by the plurality of antennas Selecting means for selecting and outputting one of the received signals; storing means for storing information of the received signal selected by the selecting means; receiving for detecting a state of the received signal selected by the selecting means A state detection unit; detecting the optimum reception signal at the present time from the plurality of reception signals based on the detection result by the reception state detection unit while sequentially switching the reception signal selected by the selection unit; An optimum reception signal detection means for performing an instruction for selecting an optimum reception signal to the selection means; and the optimum reception signal detection of the reception signal selected by the selection means; Information storage means for storing in the storage means the information held by the reception signal selected by the selection means in a predetermined period before the start of switching by the stage; and the optimum of the reception signals selected by the selection means Based on the information stored in the storage unit by the information storage unit over the switching period after the start of switching by the reception signal detection unit until the selection command is made by the optimum reception signal detection unit, the video and audio Reproduction content estimation means for estimating reproduction content in at least one of the periods; reproduction output based on a selection result by the selection means is performed in a period other than the switching period, and the reproduction content estimation is performed in the switching period. Reproduction output means for performing reproduction output based on the estimation result by the means; It is a device.

  According to a second aspect of the present invention, a reception state detection step of detecting each state of the plurality of reception signals while sequentially switching a plurality of reception signals received by a plurality of antennas; and the reception state detection step An optimum reception signal detecting step for detecting an optimum reception signal from the plurality of reception signals based on a detection result in the step; and a selection in a predetermined period before the start of switching the plurality of reception signals in the reception state detection step An information storage step for storing information contained in the signal that has been performed; and the information over a switching period from the start of switching of the plurality of reception signals in the reception state detection step to the end of the optimum reception signal detection step. Playback content for estimating the playback content in the switching period of at least one of video and audio based on information stored in the storage step A reproduction output step of performing reproduction output based on a selected received signal in a period other than the switching period, and performing reproduction output based on an estimation result in the reproduction content estimation step in the switching period. And a reception processing method.

  From a third aspect, the present invention is a reception processing program characterized by causing a calculation means to execute the reception processing method of the present invention.

  From a fourth aspect, the present invention is a recording medium on which the reception processing program of the present invention is recorded so as to be readable by a calculation means.

It is a block diagram which shows roughly the structure of the receiver which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the received signal processing unit of FIG. 3 is a flowchart for explaining a process of switching to an optimal reception signal by the reception device of FIG. 1. It is a flowchart for demonstrating the optimal received signal selection process in FIG. It is a block diagram which shows roughly the structure of the receiver which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the received signal processing unit of FIG. 6 is a flowchart for explaining a process of switching to an optimal reception signal by the reception device of FIG. 5. It is a block diagram which shows roughly the structure of the receiver which concerns on 3rd Embodiment of this invention. It is a block diagram which shows the structure of the received signal processing unit of FIG. It is a flowchart for demonstrating the switching process to the optimal received signal by the receiver of FIG. It is a block diagram which shows roughly the structure of the receiver which concerns on 4th Embodiment of this invention. It is a block diagram which shows the structure of the received signal processing unit of FIG. It is a flowchart for demonstrating the switching process to the optimal received signal by the receiver of FIG. It is a flowchart for demonstrating the optimal received signal determination process in FIG. It is a flowchart for demonstrating the received signal switching and estimation output process in FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS. Note that the present embodiment will be described by exemplifying a receiving device that is mounted on a vehicle and receives and processes a broadcast wave that has been subjected to OFDM modulation after being encoded by the MPEG method.

<Configuration>
FIG. 1 is a block diagram illustrating a schematic configuration of a receiving device 100A according to the first embodiment. As shown in FIG. 1, a receiving apparatus 100A includes an antenna unit 110 as an antenna means, a control unit 120A as an optimum received signal detecting means, an antenna switching unit 130 as a selecting means, and a received signal processing unit 140A. And. The receiving apparatus 100A includes an operation input unit 150, a sound output unit 160 as a part of the reproduction output unit, and a display unit 170 as a part of the reproduction output unit.

The antenna unit 110 receives broadcast waves. The antenna unit 110 includes four antennas 111 _{1 to} 111 ₄ . These antennas 111 _{1 to} 111 ₄ are arranged, for example, at the four corners of the roof of the vehicle. The reception results by the antennas 111 _{1 to} 111 ₄ are output toward the antenna switching unit 130 as reception signals RF1 to RF4.

  The control unit 120A controls the overall operation of the receiving apparatus 100A. The operation of the receiving apparatus 100A will be described later.

  The antenna switching unit 130 selects any one of the reception signals RF1 to RF4 in accordance with a reception signal selection command (that is, an antenna switching command) ASL from the control unit 120A. The reception signal selected by the antenna switching unit 130 is output toward the reception signal processing unit 140A as the selection reception signal SRF.

  The reception signal processing unit 140A processes the selection reception signal SRF from the antenna switching unit 130 under the control of the control unit 120A, and supplies it to the audio data ADT and the display unit 170 for supply to the sound output unit 160. To generate image data IDT. As shown in FIG. 2, the reception signal processing unit 140A includes a tuner unit 141 and an OFDM demodulation unit 142 having a function of a reception state detection unit. The reception signal processing unit 140A includes a decoding unit 143A having functions as an optimal reception signal detection unit, an information storage unit, and a reproduction content estimation unit, and a storage unit 144 as a storage unit. Further, the received signal processing unit 140A includes an audio processing unit 145 and a video processing unit 146.

  The tuner unit 141 selects a signal of a channel to be selected (hereinafter also referred to as “desired station”) according to the channel selection command CSL from the control unit 120A and the automatic gain control signal AGC from the OFDM demodulation unit 142, and receives the selected reception signal SRF. The channel selection signal SCH having an intermediate frequency is output to the OFDM demodulator 142. The tuner unit 141 includes an antenna input filter, a high frequency amplifier, a band pass filter (hereinafter also referred to as “RF filter”), a mixer (mixer), an intermediate frequency filter (hereinafter also referred to as “IF filter”), and a local oscillation. A circuit and the like (both not shown) are provided.

  In this tuner unit 141, the low-frequency component is removed by passing the selective reception signal SRF through the antenna input filter, and then the amplification specified by the automatic gain control signal AGC from the OFDM demodulation unit 142 is performed by the high-frequency amplifier. Amplified by rate. Such amplification is performed in order to set the signal level of the channel selection signal SCH within a predetermined range. Therefore, the automatic gain control signal AGC reflects the signal level of the selective reception signal SRF, and hence the power of the broadcast wave of the desired station received by the antenna corresponding to the selective reception signal SRF (hereinafter referred to as “reception power”). It has come to be.

  The automatic gain control signal AGC is output from the OFDM demodulator 142 in digital form, but is used in a high-frequency amplifier after digital-analog conversion (hereinafter referred to as “DA conversion”).

  The signal amplified by the high-frequency amplifier is extracted from the signal in a specific high frequency range by the RF filter, and then the desired station generated by the local oscillation circuit in accordance with the channel selection command CSL from the control unit 120A in the mixer. Is mixed with a local oscillation signal having a frequency corresponding to. A signal in a predetermined intermediate frequency band is selected by the IF filter from the mixing result by the mixer. This selection result is subjected to analog-digital conversion (hereinafter referred to as “AD conversion”), and then output to the OFDM demodulator 142 as a channel selection signal SCH.

  The channel selection command CSL is output from the control unit 120A in digital form, but is used in the local oscillation circuit after being DA-converted.

  The OFDM demodulation unit 142 includes an orthogonal demodulation unit, an FFT unit, an error detection / correction unit, and the like. The OFDM demodulator 142 performs OFDM demodulation processing on the channel selection signal SCH, and outputs the result to the decoder 143A as demodulated data DMD.

  Further, the OFDM demodulator 142 generates the automatic gain control signal AGC described above based on the signal level of the channel selection signal SCH. The generated automatic gain control signal AGC is output toward the tuner unit 141 and the control unit 120A.

  Also, the OFDM demodulator 142 detects a bit error rate (BER) in the OFDM demodulation result for the channel selection signal SCH. This detection result is output toward the control unit 120A.

  The detection of the BER by the OFDM demodulator 142 is performed for the m packet length. Here, the constant m is determined in advance based on broadcast wave transmission standards, experiments, simulations, experiences, and the like. The constant m is not limited to an integer and may be a rational number.

  The decoding unit 143A decodes the demodulated data DMD encoded by the MPEG method to generate demodulated audio data DAD and demodulated video data DID. The demodulated audio data DAD and demodulated video data DID thus generated are output to the audio processing unit 145 and the video processing unit 146.

  Further, the decoding unit 143A saves the decoding result in the storage unit 144 every time decoding processing is performed. At the time of such storage, the decoding unit 143A uses the storage area in the storage unit 144 as a so-called ring buffer, and displays video data for the latest plural (for example, five) screens and the display time for the recent plural screens. Save audio data over.

  In addition, the decoding unit 143A executes the estimation output process under the control of the control unit 120A. In this estimation output process, the decoding unit 143A estimates a decoding result based on the demodulated data DMD using a recent decoding result stored in the storage unit 144. Then, the decoding unit 143A outputs the estimation results to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID.

  The estimated output process is started when an estimated output process start command EPR is received from the control unit 120A. When the estimated output process stop command EPP is received from the control unit 120A, the estimated output process ends.

  The audio processing unit 145 generates audio data ADT based on the demodulated audio data DAD. The generated audio data ADT is output toward the sound output unit 160.

  The video processing unit 146 generates image data IDT based on the demodulated video data DID. The generated image data IDT is output toward the display unit 170.

  Returning to FIG. 1, the operation input unit 150 includes a key unit provided in the main body of the receiving device 100 </ b> A, or a remote input device including the key unit. Here, a touch panel provided in the display unit 170 can be used as the key part provided in the main body. Moreover, it can replace with the structure which has a key part, and the structure which inputs voice can also be employ | adopted. The result of operation input to the operation input unit 150 is sent to the control unit 120A as operation input data IPD.

  The sound output unit 160 includes (i) a DA converter that converts the audio data ADT received from the reception signal processing unit 140A into an analog signal, and (ii) an amplifier that amplifies the analog signal output from the DA converter; (Iii) It is provided with a speaker that converts the amplified analog signal into sound. The sound output unit 160 outputs broadcast sound from a desired station.

  The display unit 170 includes (i) a display device such as a liquid crystal display panel, an organic EL (Electro Luminescence) panel, a PDP (Plasma Display Panel), and (ii) the display data according to the image data IDT received from the reception signal processing unit 140A. A display control circuit for displaying an image on the device. The display unit 170 displays broadcast video from the desired station.

  The control unit 120A controls the antenna switching unit 130 and the received signal processing unit 140A to realize video and audio reproduction processing corresponding to the desired station. Specifically, the control unit 120A, in response to the user's designation input of the desired station to the operation input unit 150, receives the channel selection command CSL of the desired station in the received signal processing unit 140A (more specifically, the tuner unit 141). )

The control unit 120A also monitors the BER reported from the received signal processing unit 140A (more specifically, the OFDM demodulator 142). Based on the monitoring result, in order to perform reception and reproduction processing of the broadcast wave from the desired desired station, the optimum reception signal is selected from the reception signals RF1 to RF4 from the plurality of antennas 111 _{1 to} 111 _4. Optimal received signal switching processing for switching to is performed.

  In the optimum received signal switching process, the control unit 120A appropriately issues a received signal selection command ASL, an estimated output process start command EPR, and an estimated output process stop command EPP. Details of the optimum received signal switching process performed in this way will be described later.

<Operation>
The operation of the receiving apparatus 100A configured as described above will be described mainly focusing on the optimum received signal switching process. In the following description, initially, it is assumed that control unit 120A designates selection of reception signal RF1 to antenna switching unit 130 by selection command ASL. In addition, initially, it is assumed that the decoding unit 143A has not performed the estimated output process accompanying the issuance of the estimated output process start command EPR by the control unit 120A.

  In the receiving device 100A, when the user inputs a desired station designation to the operation input unit 150, the fact is reported to the control unit 120A. Upon receiving this report, the control unit 120A sends a channel selection command CSL for the desired station to the tuner unit 141 in the reception signal processing unit 140A.

  Upon receiving the channel selection command CSL, the tuner unit 141 extracts a reception signal from the desired station in the reception signal RF1 that is the selection reception signal SRF output from the antenna switching unit 130, and uses it as the channel selection signal SCH as an OFDM demodulation unit. Send to 142. Receiving the channel selection signal SCH, the OFDM demodulation unit 142 demodulates the channel selection signal SCH and sends it to the decoding unit 143A as demodulated data DMD. In parallel with the demodulation processing, the OFDM demodulator 142 generates an automatic gain control signal AGC and sends it to the tuner 141 and the control unit 120A, and sends a bit error rate BER to the control unit 120A.

  Upon receiving the demodulated data DMD, the decoding unit 143A decodes the demodulated data DMD encoded by the MPEG method, and sends it to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID. In parallel with the decoding process, the decoding unit 143A sequentially stores the decoding results in the storage unit 144.

  Upon receiving the demodulated sound data DAD, the sound processing unit 145 generates sound data ADT and sends it to the sound output unit 160. As a result, the broadcast sound from the desired station based on the received signal RF1 is output from the speaker of the sound output unit 160.

  On the other hand, the video processing unit 146 that has received the demodulated video data DID generates image data IDT and sends it to the display unit 160. As a result, the broadcast video from the desired station based on the received signal RF1 is displayed on the display device of the display unit 170.

  In parallel with the above normal reception process, step S11 in the optimum reception signal switching process shown in FIG. 3 is executed. In step S11, the control unit 120A monitors the BER reported from the OFDM demodulator 142, and determines whether or not the BER value is greater than a predetermined threshold value THV. If the result of this determination is negative (step S11: N), the control unit 120A determines that the selection of the received signal at the present time is appropriate, and repeats step S11.

  If the result of determination in step S11 is affirmative (step S11: Y), control unit 120A determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120A proceeds to step S12.

  In step S12, the control unit 120A sends an estimated output process start command EPR to the decoding unit 143A. Receiving this estimated output process start command EPR, the decoding unit 143A starts the estimated output process of step S13.

  When the estimation output process is started, the decoding unit 143A stops the decoding process on the demodulated data DMD from the OFDM demodulation unit 142. Subsequently, the decoding unit 143A reads the latest decoding result stored in the storage unit 144. Then, the decoding unit 143A estimates the decoding result that would have been obtained if the demodulated data DMD had been decoded based on the read decoding result, and used as demodulated audio data DAD and demodulated video data DID. And sent to the audio processing unit 145 and the video processing unit 146. As a result, in the period during the estimation output process in step S13, the sound based on the estimation result by the decoding unit 143A is output from the speaker of the sound output unit 160, and the image based on the estimation result by the decoding unit 143A is displayed. It is displayed on the display device of the unit 170.

  When the process of step S12 ends, the process in the control unit 120A proceeds to step S14. In step S14, an optimum received signal selection process is performed. In this optimum received signal selection processing, as shown in FIG. 4, first, in step S21, the control unit 120A designates selection of a received signal by the next antenna to the antenna switching unit 130 by a selection command ASL. . Upon receiving this selection command ASL, the antenna switching unit 130 sends a reception signal from the designated next antenna to the tuner unit 141 as the selection reception signal SRF. As a result, the BER of the broadcast wave component from the desired station in the designated received signal is detected by the OFDM demodulator 142 and reported to the control unit 120A.

  In step S <b> 22, the control unit 120 </ b> A obtains the BER of the signal received from the next antenna reported from the OFDM demodulator 142.

  Subsequently, in step S23, the control unit 120A determines whether or not the BER has been acquired for all of the reception signals RF1 to RF4, including the BER for RF1 acquired before the start of step S14. If the result of this determination is negative (step S23: N), the process returns to step S21. Thereafter, the processes in steps S21 to S23 are repeated until the result of the determination in step S23 becomes affirmative.

  When BER is acquired for all of the reception signals RF1 to RF4 and the result of determination in step S23 is affirmative (step S23; Y), the process proceeds to step S24. In step S24, the control unit 120A determines the received signal that is the smallest BER among the four acquired BERs as the optimum received signal.

  Then, in step S25, the control unit 120A instructs the antenna switching unit 130 to select the optimum received signal determined by the selection command ASL. As a result, the optimum switching signal at that time is sent from the antenna switching unit 130 to the OFDM demodulator 142 as the selective receiving signal SRF. Then, the OFDM demodulator 142 performs demodulation processing on the selected reception signal SRF, and sends the demodulation result to the decoder 143A.

  When the process of step S25 ends, the process of step S14 ends, and the process of the control unit 120A proceeds to step S15 of FIG.

  In step S15, the control unit 120A sends an estimated output process end command EPP to the decoding unit 143A. Receiving this estimated output process end command EPP, the decoding unit 143A ends the estimated output process of step S13. The decoding unit 143A that has finished the estimation output process decodes the demodulated data DMD, sends it to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID, and in parallel with the decoding process. The decoding unit 143A resumes the process of sequentially storing the decoding results in the storage unit 144.

  On the other hand, when the process of step S15 ends, the process of the control unit 120A returns to step S11. As a result, the monitoring of the BER reported from the OFDM demodulator 142 by the control unit 120A is resumed.

As described above, in the first embodiment, based on the detection result of the BER in the OFDM demodulator 142, the current reception signals RF1 to RF4 received from the plurality of antennas 111 _{1 to} 111 ₄ are currently selected. When it is determined that the selected received signal is not appropriate, the control unit 120A sequentially switches the received signal selected by the antenna switching unit 130 to determine the optimum received signal. Then, the control unit 120A causes the antenna switching unit 130 to select the determined optimum received signal.

  On the other hand, during the period of the optimum reception signal selection process, the decoding unit 143A obtains the decoding result that would have been obtained if the decoding unit DMA decoded the demodulated data DMD from the OFDM demodulation unit 142 related to the optimum reception signal. Estimation is performed based on the latest decoding result stored in the storage unit 144. Then, based on the estimation result, sound is output from the speaker of the sound output unit 160 and an image is displayed on the display device of the display unit 170.

  Therefore, according to the first embodiment, it is possible to appropriately perform reproduction of video or audio performed by receiving broadcast waves with a simple configuration without giving a sense of incongruity to the user.

[Second Embodiment]
First, a second embodiment of the present invention will be described with reference to other drawings as appropriate while mainly referring to FIGS. As in the case of the first embodiment described above, the second embodiment also receives a broadcast wave that is mounted on a vehicle, coded by the MPEG method, and then subjected to OFDM modulation. An example of a receiving device to be processed will be described.

<Configuration>
FIG. 5 is a block diagram illustrating a schematic configuration of a receiving device 100B according to the second embodiment. As shown in FIG. 5, the receiving device 100B includes a control unit 120B instead of the control unit 120A, as compared with the receiving device 100A according to the first embodiment, and instead of the received signal processing unit 140A. The only difference is that the reception signal processing unit 140B is provided. As shown in FIG. 6, the received signal processing unit 140B is different from the received signal processing unit 140A only in that a decoder unit 143B is provided instead of the decoder unit 143A.

  Similarly to the decoder unit 143A, the decoder unit 143B decodes the demodulated data DMD encoded by the MPEG method to generate demodulated audio data DAD and demodulated video data DID. The demodulated audio data DAD and demodulated video data DID thus generated are output to the audio processing unit 145 and the video processing unit 146.

  In addition, the decoding unit 143B stores a part of the decoding result in the storage unit 144 every time decoding processing is performed. At the time of such storage, the decoding unit 143B uses the storage area in the storage unit 144 as a so-called ring buffer, and the video data of a predetermined area in the recent plural (for example, five) screens, and the recent plural screens Audio data over a display time in a predetermined area is stored. Here, the predetermined area is an area large enough for an estimated output process to be described later. The predetermined area is determined in advance based on the display method (for example, interlace method or non-interlace method) in the display unit 170, the transmission standard of broadcast waves, experiment, simulation, experience, and the like.

  Further, the decoding unit 143B executes an estimation output process based on the decoding result stored in the storage unit 144 under the control of the control unit 120B. This estimated output process is started when the demodulated data DMD from the OFDM demodulator 142 is related to the predetermined area after receiving the estimated output process start command EPR from the control unit 120B. When the estimated output process is started, the decoding unit 143B reports the estimated output process start notification EPB to the control unit 120B.

  Note that the estimated output processing by the decoding unit 143B ends when the estimated output processing stop command EPP is received from the control unit 120B, as in the case of the decoding unit 143A.

  The control unit 120B is different from the control unit 120A only in that it waits for the estimated output process start notification EPB from the decoding unit 143B and starts the optimum received signal selection process similar to step S14 described above.

<Operation>
The operation of the receiving apparatus 100B configured as described above will be described mainly focusing on the optimum received signal switching process. In the following description, initially, it is assumed that control unit 120B designates selection of reception signal RF1 to antenna switching unit 130 by selection command ASL. In addition, at the beginning, it is assumed that the decoding unit 143B has not performed the estimated output process accompanying the issuance of the estimated output process start command EPR by the control unit 120B.

  In the receiving device 100B, normal reception processing other than the optimal received signal switching processing is executed in the same manner as the receiving device 100A according to the first embodiment. In parallel with the normal reception process, step S31 in the optimum reception signal switching process shown in FIG. 7 is executed. In step S31, as in step S11 described above, the control unit 120B monitors the BER reported from the OFDM demodulator 142 and determines whether or not the BER value is greater than a predetermined threshold value THV. If the result of this determination is negative (step S31: N), the control unit 120B determines that the selection of the received signal at the present time is appropriate, and repeats step S31.

  If the result of determination in step S31 is affirmative (step S31: Y), the control unit 120B determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120B proceeds to step S32.

  In step S32, the control unit 120B sends an estimated output process start command EPR to the decoding unit 143B. Receiving this estimated output processing start command EPR, the decoding unit 143B waits for the demodulated data DMD from the OFDM demodulating unit 142 to be related to the predetermined area in step S33. When the demodulated data DMD relates to the predetermined area, the decoding unit 143B starts the estimation output process in step S34.

  In step S34, first, the decoding unit 143B stops the decoding process on the demodulated data DMD from the OFDM demodulation unit 142, and reports an estimated output process start notification EPB to the control unit 120B. Subsequently, the decoding unit 143B reads the latest decoding result stored in the storage unit 144. Then, the decoding unit 143B estimates the decoding result that would have been obtained if the demodulated data DMD was decoded based on the read decoding result, and used as the demodulated audio data DAD and demodulated video data DID. And sent to the audio processing unit 145 and the video processing unit 146. As a result, in the period during the estimation output process in step S34, the sound based on the estimation result by the decoding unit 143B is output from the speaker of the sound output unit 160, and the image based on the estimation result by the decoding unit 143B is displayed. It is displayed on the display device of the unit 170.

  On the other hand, the control unit 120B that has received the estimated output process start notification EPB starts the optimum received signal selection process in step S35. In step S35, the process similar to the process in step S14 by the control unit 120A described above is executed by the control unit 120B.

  Next, in step S36, the control unit 120B sends an estimated output process end command EPP to the decoding unit 143B. Receiving this estimated output processing end command EPP, the decoding unit 143B ends the estimated output processing of step S34, decodes the demodulated data DMD, and uses the audio processing unit 145 and the video processing as demodulated audio data DAD and demodulated video data DID. At the same time as the decoding process, the decoding unit 143B restarts the process of sequentially storing the decoding results in the storage unit 144.

  On the other hand, when the process of step S36 ends, the process of the control unit 120B returns to step S31. As a result, the monitoring of the BER reported from the OFDM demodulator 142 by the control unit 120B is resumed.

As described above, in the second embodiment, based on the detection result of the BER in the OFDM demodulator 142, the current signal is selected from the plurality of reception signals RF1 to RF4 received by the plurality of antennas 111 _{1 to} 111 _4. When it is determined that the selected received signal is not appropriate, the control unit 120B sends an estimated output processing start command EPR to the decoding unit 143B. Receiving this estimated output processing start command EPR, the decoding unit 143B waits for the demodulated data DMD from the OFDM demodulating unit 142 to relate to the predetermined area, and then sends the estimated output processing start notification EPB to the control unit 120B. Report and start the estimated output process.

  Receiving the estimated output process start notification EPB, the control unit 120B sequentially switches the reception signals selected by the antenna switching unit 130 to determine the optimum reception signal. Then, the control unit 120B causes the antenna switching unit 130 to select the determined optimum received signal.

  During the period of the optimum reception signal selection process, the decoding unit 143B stores the decoding result that would have been obtained if the decoding data DMD from the OFDM demodulation unit 142 related to the optimum reception signal was decoded. Estimation is performed based on the latest decoding result stored in the unit 144. Then, based on the estimation result, sound is output from the speaker of the sound output unit 160 and an image is displayed on the display device of the display unit 170.

  Therefore, according to the second embodiment, as in the case of the first embodiment described above, video or audio reproduction performed by receiving broadcast waves with a simple configuration without giving the user a sense of incongruity. Can be performed appropriately.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to other drawings as appropriate while mainly referring to FIGS. As in the case of the first embodiment described above, the third embodiment also receives a broadcast wave that is mounted on a vehicle, coded by the MPEG method, and then subjected to OFDM modulation. An example of a receiving device to be processed will be described.

<Configuration>
FIG. 8 is a block diagram illustrating a schematic configuration of a receiving device 100C according to the third embodiment. As illustrated in FIG. 8, the receiving device 100C includes a control unit 120C instead of the control unit 120A and a received signal processing unit 140A, compared to the receiving device 100A according to the first embodiment. The only difference is that the reception signal processing unit 140C is provided. As shown in FIG. 9, the received signal processing unit 140C is different from the received signal processing unit 140A only in that a decoder unit 143C is provided instead of the decoder unit 143A.

  Similarly to the decoder unit 143A, the decoder unit 143C decodes the demodulated data DMD encoded by the MPEG method, and generates demodulated audio data DAD and demodulated video data DID. The demodulated audio data DAD and demodulated video data DID thus generated are output to the audio processing unit 145 and the video processing unit 146.

  In addition, when the decoding unit 143C receives the estimated output processing start instruction EPR from the control unit 120C, the decoding unit 143C starts saving the decoding result in the storage unit 144. Then, video data for a plurality of (for example, five) screens sufficient for estimation output processing similar to the case of the first embodiment, and audio data over the display times of the recent plurality of screens are stored. When the storage of the decoding result is completed, the decoding unit 143C starts the estimation output process and reports the estimation output process start notification EPC to the control unit 120C.

  Note that the estimated output processing by the decoding unit 143C ends when the estimated output processing stop command EPP is received from the control unit 120C, as in the case of the decoding unit 143A.

  The control unit 120C is different from the control unit 120A only in that it waits for the estimated output process start notification EPC from the decoding unit 143C and starts the optimum received signal selection process similar to step S14 described above.

<Operation>
The operation of the receiving apparatus 100C configured as described above will be described mainly focusing on the optimum received signal switching process. In the following description, initially, it is assumed that control unit 120C designates selection of reception signal RF1 to antenna switching unit 130 by selection command ASL. In addition, at the beginning, it is assumed that in the decoding unit 143C, the estimated output process accompanying the issuance of the estimated output process start command EPR by the control unit 120C is not performed.

  In the receiving apparatus 100C, normal receiving processes other than the optimum received signal switching process are executed in the same manner as the receiving apparatus 100A according to the first embodiment, except that the decoding result is not stored by the decoding unit 143C. In parallel with the normal reception process, step S41 in the optimum reception signal switching process shown in FIG. 10 is executed. In step S41, as in step S11 described above, the control unit 120C monitors the BER reported from the OFDM demodulator 142 and determines whether or not the BER value is greater than a predetermined threshold value THV. If the result of this determination is negative (step S41: N), the control unit 120C determines that the selection of the received signal at the present time is appropriate, and repeats step S41.

  If the result of determination in step S41 is affirmative (step S41: Y), the control unit 120C determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120C proceeds to step S42.

  In step S42, the control unit 120C sends an estimated output process start command EPR to the decoding unit 143C. Receiving this estimated output processing start command EPR, the decoding unit 143C stores the decoding result of the demodulated data DMD from the OFDM demodulating unit 142 in step S43. When the storage amount of the decoding result is sufficient for the estimated output process, the decoding unit 143C starts the estimated output process in step S44.

  In step S44, first, the decoding unit 143C stops the decoding process on the demodulated data DMD from the OFDM demodulation unit 142, and reports an estimated output process start notification EPC to the control unit 120C. Subsequently, the decoding unit 143C performs an estimation output process similar to the process in step S13 by the decoding unit 143A in the first embodiment. The result of the estimation output process in step S44 is sent to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID. As a result, in the period during the estimation output process in step S44, the sound based on the estimation result by the decoding unit 143C is output from the speaker of the sound output unit 160, and the image based on the estimation result by the decoding unit 143C is displayed. It is displayed on the display device of the unit 170.

  On the other hand, the control unit 120C that has received the estimated output process start notification EPC starts the optimum received signal selection process in step S45. In step S45, a process similar to the process in step S14 by the control unit 120A described above is executed by the control unit 120C.

  Next, in step S46, the control unit 120C sends an estimated output process end command EPP to the decoding unit 143C. Receiving this estimated output processing end command EPP, the decoding unit 143C ends the estimated output processing in step S44, decodes the demodulated data DMD, and uses the audio processing unit 145 and the video processing as demodulated audio data DAD and demodulated video data DID. Processing to be sent to the unit 146 is resumed.

  On the other hand, when the process of step S46 ends, the process of the control unit 120C returns to step S41. As a result, the monitoring of the BER reported from the OFDM demodulator 142 by the control unit 120C is resumed.

As described above, in the third embodiment, based on the result of BER detection in the OFDM demodulator 142, the current signal is selected from the plurality of reception signals RF1 to RF4 received by the plurality of antennas 111 _{1 to} 111 _4. When it is determined that the selected received signal is not appropriate, the control unit 120C sends an estimated output processing start command EPR to the decoding unit 143C. Receiving this estimated output processing start command EPR, the decoding unit 143C stores the decoding result of the demodulated data DMD from the OFDM demodulating unit 142 by an amount sufficient for the estimated output processing. When the storage amount of the decoding result is sufficient for the estimated output process, the decoding unit 143C reports the estimated output process start notification EPC to the control unit 120C and starts the estimated output process.

  Upon receiving the estimated output process start notification EPC, the control unit 120C sequentially switches the reception signals selected by the antenna switching unit 130 to determine the optimum reception signal. Then, the control unit 120C causes the antenna switching unit 130 to select the determined optimum received signal.

  During the optimum reception signal selection process, the decoding unit 143C stores the decoding result that would have been obtained if the decoding unit DMC decoded the demodulated data DMD from the OFDM demodulation unit 142 related to the optimum reception signal. Estimation is performed based on the latest decoding result stored in the unit 144. Then, based on the estimation result, sound is output from the speaker of the sound output unit 160 and an image is displayed on the display device of the display unit 170.

  Therefore, according to the third embodiment, as in the case of the first embodiment described above, video or audio reproduction performed by receiving broadcast waves with a simple configuration without giving the user a sense of incongruity. Can be performed appropriately.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 to 15 and other drawings as appropriate. As in the case of the first embodiment described above, the fourth embodiment also receives a broadcast wave that is mounted on a vehicle, coded by the MPEG method, and then subjected to OFDM modulation. An example of a receiving device to be processed will be described.

<Configuration>
FIG. 11 is a block diagram illustrating a schematic configuration of a receiving device 100D according to the fourth embodiment. As shown in FIG. 11, the receiving device 100D includes a control unit 120D instead of the control unit 120A and a received signal processing unit 140A compared to the receiving device 100A according to the first embodiment. The only difference is that the reception signal processing unit 140D is provided. As shown in FIG. 12, the reception signal processing unit 140D is different from the reception signal processing unit 140A only in that a decoder unit 143D is provided instead of the decoder unit 143A.

  Similarly to the decoder unit 143A, the decoder unit 143D decodes the demodulated data DMD encoded by the MPEG method, and generates demodulated audio data DAD and demodulated video data DID. The demodulated audio data DAD and demodulated video data DID thus generated are output to the audio processing unit 145 and the video processing unit 146. In parallel with the decoding process, the decoding unit 143C sequentially stores the decoding results in the storage unit 144, similarly to the decoder unit 143A.

  In addition, when receiving the received signal switching request SWR specifying the type of received signal from the control unit 120D, the decoding unit 143D instructs the antenna switching unit 130 to select the specified received signal by the selection command ASL. . Thereafter, the decoding unit 143D reports the reception signal switching report SWA to the control unit 120D that it has switched to the designated reception signal.

  Further, when receiving the received signal switching request SWR from the control unit 120D in a state where the estimated output process is not performed, the decoding unit 143D starts the estimated output process. In the estimation output process, the decoding unit 143D performs the same process as the estimation output process by the decoding unit 143A.

  In addition, upon receiving the optimum signal determination notification SLA designating the type of received signal from the control unit 120D, the decoding unit 143D commands the antenna switching unit 130 to select the designated received signal by a selection command ASL. . Then, the decoding unit 143D stops the estimation output process.

  Returning to FIG. 11, the control unit 120D controls the reception signal processing unit 140D to realize the reproduction processing of video and audio corresponding to the desired station. Specifically, similarly to the control unit 120A, the control unit 120D responds to the designation input of the desired station by the user to the operation input unit 150, and receives the channel selection command CSL of the desired station in the received signal processing unit 140C ( More specifically, it is sent to the tuner unit 141).

In addition, the control unit 120D monitors the BER reported from the reception signal processing unit 140D (more specifically, the OFDM demodulator 142), similarly to the control unit 120A. Based on the monitoring result, in order to perform reception and reproduction processing of the broadcast wave from the desired desired station, the optimum reception signal is selected from the reception signals RF1 to RF4 from the plurality of antennas 111 _{1 to} 111 _4. Optimal received signal switching processing for switching to is performed.

  In the optimum reception signal switching process, the control unit 120D appropriately issues a reception signal switching request SWR and an optimum signal determination notification SLA. Details of the optimum received signal switching process performed in this way will be described later.

<Operation>
The operation of the receiving apparatus 100D configured as described above will be described mainly focusing on the optimum received signal switching process. In the following description, initially, it is assumed that control unit 120D designates selection of reception signal RF1 to antenna switching unit 130 by selection command ASL. In addition, initially, it is assumed that the estimation output process is not performed in the decoding unit 143D.

  In the receiving device 100D, normal reception processing other than the optimal received signal switching processing is executed in the same manner as the receiving device 100A according to the first embodiment. In parallel with the normal reception process, step S51 in the optimum reception signal switching process shown in FIG. 13 is executed. In step S51, as in step S11 described above, the control unit 120D monitors the BER reported from the OFDM demodulator 142 and determines whether or not the BER value is greater than a predetermined threshold value THV. If the result of this determination is negative (step S51: N), the control unit 120D determines that the selection of the received signal at the present time is appropriate, and repeats step S51.

  If the result of determination in step S51 is affirmative (step S51: Y), the control unit 120D determines that the selection of the received signal at the present time is not appropriate. Then, the process in the control unit 120D proceeds to step S52.

  In step S52, the control unit 120D performs an optimum signal determination process. In this optimum signal determination process, as shown in FIG. 14, first, in step S61, the control unit 120D decodes a request for switching to the next received signal by a received signal switching request SWR designating the type of received signal. Send to part 143D.

  Subsequently, in step S62, the control unit 120D determines whether or not the reception signal switching report SWA has been received from the decoder unit 143D. When the result of this determination is negative (step S62: N), the control unit 120D repeats the process of step S62.

  If reception signal switching report SWA is received and the result of determination in step S62 is affirmative, the process proceeds to step S63. In step S63, the control unit 120D acquires the BER of the signal received by the next antenna reported from the OFDM demodulator 142.

  Subsequently, in step S64, the control unit 120D determines whether or not the BER has been acquired for all of the reception signals RF1 to RF4, including the BER for RF1 acquired before the start of step S52. If the result of this determination is negative (step S64: N), the process returns to step S61. Thereafter, the processes in steps S61 to S64 are repeated until the result of the determination in step S64 becomes affirmative.

  When BER is acquired for all of the reception signals RF1 to RF4 and the result of determination in step S64 is affirmative (step S64; Y), the process proceeds to step S65. In step S <b> 65, the control unit 120 </ b> D determines the received signal that is the smallest BER among the acquired four BERs as the optimum received signal.

  When the process of step S65 is completed in this way, the process of step S52 is completed, and the process of the control unit 120D proceeds to step S54 of FIG.

  In step S54, the control unit 120D sends an optimum signal determination notification SLA designating the type of the received signal determined as the optimum received signal to the decoding unit 143D. Thereafter, the process of the control unit 120D returns to step S51. As a result, the monitoring of the BER reported from the OFDM demodulator 142 by the control unit 120D is resumed.

  On the other hand, when receiving the received signal switching request SWR transmitted first by the control unit 120D in step S52, the decoding unit 143D starts the received signal switching and estimated output processing in step S53. When step S53 is started, as shown in FIG. 15, the decoding unit 143D starts the estimation output process of step S71 and the reception signal switching process of steps S72 to S75.

  In step S71, the decoding unit 143D performs an estimation output process similar to the process in step S13 by the decoding unit 143A in the first embodiment. The result of the estimated output processing in step S71 is sent to the audio processing unit 145 and the video processing unit 146 as demodulated audio data DAD and demodulated video data DID. As a result, in the period during the estimation output process in step S71, the sound based on the estimation result by the decoding unit 143D is output from the speaker of the sound output unit 160, and the image based on the estimation result by the decoding unit 143D is displayed. It is displayed on the display device of the unit 170.

  In the reception signal switching process, first, in step S72, the decoding unit 143D performs a reception signal selection process. In this reception signal selection process, the decoding unit 143D instructs the antenna switching unit 130 to select the reception signal specified in the reception signal switching request SWR by the selection command ASL. Thereafter, the decoding unit 143D sends a reception signal switching report SWA to the control unit 120D.

  Next, in step S73, the decoding unit 143D determines whether or not the reception signal switching request SWR from the control unit 120D has been received. If the result of this determination is affirmative (step S73: Y), the process returns to step S72.

  If the result of the determination in step S73 is negative (step S73: N), the process proceeds to step S74. In step S74, the decoding unit 143D determines whether or not the optimum signal determination notification SLA from the control unit 120D has been received as a reception signal selection result.

  If the result of the determination in step S74 is negative (step S74: N), the process returns to step S73. On the other hand, when the result of the determination in step S74 is affirmative (step S74: Y), the process proceeds to step S75.

  In step S75, the decoding unit 143D instructs the antenna switching unit 130 to select the received signal specified in the optimum signal determination notification SLA by the selection command ASL.

  When the process in step S75 ends in this way, the decoding unit 143D ends the estimation output process in step S71. Thereby, the process of step S53 is complete | finished. Thereafter, the decoding unit 143D decodes the demodulated data DMD, resumes the process of sending the demodulated audio data DAD and demodulated video data DID to the audio processing unit 145 and the video processing unit 146, and stores the decoding result. The saving process to 144 is resumed.

As described above, in the fourth embodiment, based on a result of the BER detection in the OFDM demodulator 142, a plurality of antennas 111 ₁ to 111 ₄ current from a plurality of received signals RF1~RF4 received by When it is determined that the selected received signal is not appropriate, the control unit 120D requests the decoding unit 143D to switch the received signal, thereby sequentially switching the received signal selected in the antenna switching unit 130. To determine the optimum received signal. Then, the control unit 120D reports the determined optimum received signal to the decoding unit 143D. The decoding unit 143D that has received the report of the determined optimum received signal causes the antenna switching unit 130 to select the optimum received signal.

  During the optimum reception signal selection process, the decoding unit 143D stores the decoding result that would be obtained if the decoding unit 143D performed the demodulated data DMD from the OFDM demodulation unit 142 regarding the optimum reception signal. Estimate based on the recent decoding results stored in. Then, based on the estimation result, sound is output from the speaker of the sound output unit 160 and an image is displayed on the display device of the display unit 170.

  Therefore, according to the fourth embodiment, as in the case of the first embodiment described above, video or audio reproduction performed by receiving broadcast waves with a simple configuration without giving the user a sense of incongruity. Can be performed appropriately.

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

  For example, in the first to fourth embodiments described above, it is determined based on the bit error rate (BER) in the selective reception signal SRF whether or not the selective reception signal SRF is in an appropriate state for reception processing. The determination may be made based on the value of the automatic gain control signal AGC reflecting the power of the signal SRF.

  In the first to fourth embodiments, the decoding unit 143 </ b> A to 143 </ b> D decodes the demodulated data from the OFDM demodulation unit 142 regarding the optimal reception signal during the selection process of the optimal reception signal for both the image and the sound. The decoding result that would have been obtained if DMD was performed is estimated based on the latest decoding result stored in the storage unit 144. On the other hand, for the sound, during the period of the optimum reception signal selection process, the sound immediately before the start of the optimum reception signal selection process period is lowered and output from the sound output unit 160. Good.

  Moreover, the same deformation | transformation as 2nd Embodiment with respect to 1st Embodiment can also be performed with respect to 3rd or 4th Embodiment, and it is the same as the deformation | transformation to 3rd Embodiment with respect to 1st Embodiment. Modifications can also be made to the second or fourth embodiment. Furthermore, a modification similar to the modification of the first embodiment to the fourth embodiment can be performed on the second or third embodiment.

  In the above first to fourth embodiments, the present invention is applied to a receiving device mounted on a vehicle. However, the present invention may be applied to a receiving device mounted on a moving body other than the vehicle. it can.

  Note that the control unit, OFDM demodulator, decoder, audio processor, and video processor in the above embodiment are the central processing unit (CPU), DSP (Digital Signal Processor), and read-only memory (ROM). It is configured as a computer as a calculation means having only memory (RAM), random access memory (RAM), etc., and a program prepared in advance is executed by the computer so that the processing in the above embodiment is performed. It may be. This program is recorded on a computer-readable recording medium such as a hard disk, CD-ROM, or DVD, and is read from the recording medium and executed by the computer. The program may be acquired in a form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in a form of delivery via a network such as the Internet. Also good.

From a first aspect, the present invention is a receiving device that receives broadcast waves and reproduces at least one of video and audio, and includes antenna means having a plurality of antennas; and a plurality of antennas received by the plurality of antennas Selecting means for selecting and outputting one of the received signals; storing means for storing information of the received signal selected by the selecting means; receiving for detecting a state of the received signal selected by the selecting means A state detection unit; detecting the optimum reception signal at the present time from the plurality of reception signals based on the detection result by the reception state detection unit while sequentially switching the reception signal selected by the selection unit; An optimum reception signal detection means for performing an instruction for selecting an optimum reception signal to the selection means; and the optimum reception signal detection of the reception signal selected by the selection means; Information storage means for storing in the storage means the information held by the reception signal selected by the selection means in a predetermined period before the start of switching by the stage; and the optimum of the reception signals selected by the selection means after switching initiation by receiving signal detecting means, for between switching period until the selection instruction is made by the best received signal detection means, by using the information stored in the storage means by the information storage unit, the video and audio Reproduction content estimation means for estimating the content of reproduction in at least one of the switching periods ; during periods other than the switching period, reproduction output based on the selection result by the selection means is performed, and during the switching period, the reproduction contents are reproduced. Reproduction output means for performing reproduction output based on the estimation result by the content estimation means; A receiving device.

According to a second aspect of the present invention, a reception state detection step of detecting each state of the plurality of reception signals while sequentially switching a plurality of reception signals received by a plurality of antennas; and the reception state detection step An optimum reception signal detecting step for detecting an optimum reception signal from the plurality of reception signals based on a detection result in the step; and a selection in a predetermined period before the start of switching of the plurality of reception signals in the reception state detection step. An information storage step for storing information contained in the signal that has been performed; and the information over a switching period from the start of switching of the plurality of reception signals in the reception state detection step to the end of the optimum reception signal detection step. using the information stored in the storing step, to estimate the reproduction contents between at least one of the switching period of the video and audio reproduction contents A reproduction output step of performing reproduction output based on a selected received signal in a period other than the switching period, and performing reproduction output based on an estimation result in the reproduction content estimation step in the switching period. And a reception processing method.

Claims (11)

A receiving device that receives broadcast waves and reproduces at least one of video and audio,
Antenna means having a plurality of antennas;
Selecting means for selecting and outputting one of a plurality of received signals received by the plurality of antennas;
Storage means for storing information of the received signal selected by the selection means;
Receiving state detecting means for detecting the state of the received signal selected by the selecting means;
While switching the reception signals selected by the selection unit sequentially, based on the detection result by the reception state detection unit, the optimal reception signal at the present time is detected from the plurality of reception signals, and the optimal reception signal Optimum received signal detecting means for performing a selection command to the selecting means;
Information storage for storing, in the storage unit, information held by the reception signal selected by the selection unit in a predetermined period before the start of switching by the optimum reception signal detection unit of the reception signal selected by the selection unit With means;
After the start of switching of the received signal selected by the selecting unit by the optimum received signal detecting unit, the information storing unit stores the received signal in the storage unit for a switching period until the selection command is made by the optimum received signal detecting unit. Reproduction content estimation means for estimating the reproduction content of at least one of the video and audio based on the recorded information;
Reproduction output means for performing reproduction output based on the selection result by the selection means in a period other than the switching period, and performing reproduction output based on the estimation result by the reproduction content estimation means in the switching period;
A receiving apparatus comprising:   The receiving apparatus according to claim 1, wherein the reception state detection unit detects a bit error rate of the reception signal selected by the selection unit.   The receiving apparatus according to claim 1, wherein the reception state detection unit detects reception power of the broadcast wave by an antenna corresponding to the reception signal selected by the selection unit. The playback output includes a video playback output,
The information storage means stores in the storage means reception information including video information of a predetermined area in each of a plurality of screens before the start of switching by the optimum reception signal detection means;
The receiving apparatus according to claim 1.   The receiving apparatus according to claim 4, wherein the predetermined area is a full screen area.   The receiving apparatus according to claim 4, wherein the predetermined area is a part of a screen area.   The information storage unit starts storage processing in the storage unit when a detection result by the reception state detection unit deviates from a predetermined range as a preferable range for the reproduction output. The receiving device according to claim 1.   The receiving apparatus according to claim 1, wherein the receiving apparatus is mounted on a moving body. A reception state detection step of detecting each state of the plurality of reception signals while sequentially switching the plurality of reception signals received by the plurality of antennas;
An optimum reception signal detection step of detecting an optimum reception signal from the plurality of reception signals based on a detection result in the reception state detection step;
An information storage step of storing information included in the selected signal in a predetermined period before the start of switching of the plurality of reception signals in the reception state detection step;
Based on the information stored in the information storage step over the switching period from the start of switching of the plurality of reception signals in the reception state detection step to the end of the optimum reception signal detection step, at least one of video and audio A reproduction content estimation step of estimating reproduction content in the switching period;
A reproduction output step for performing reproduction output based on a selected received signal in a period other than the switching period, and performing reproduction output based on an estimation result in the reproduction content estimation step in the switching period;
A reception processing method.   A reception processing program for causing a calculation means to execute the reception processing method according to claim 9.   11. A recording medium on which the reception processing program according to claim 10 is recorded so as to be readable by an arithmetic means.

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