JP2008259036A - Receiver and receiving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver and a receiving method capable of reducing power consumption without giving displeasure in particular to a user. <P>SOLUTION: A tuner 200 receives a broadcasting signal including image data and sound data and a receiving quality calculation part 240 judges receiving quality of the broadcasting signal. A receiving quality judgment part 320 compares the judged receiving quality with a first threshold of receiving quality by which the content of a display image can be discriminated to judge whether or not performing decoding processing to the broadcasting signal and compares the judged receiving quality with a second threshold of the receiving quality by which an effect of high definition processing is obtained to judge which is performed, the high definition processing or standard definition processing. A high definition processing selection part 330, when it is judged that the high definition processing is performed, selects the high definition processing in a set high definition mode to execute it and when it is judged that the standard definition processing is performed, selects the standard definition processing with lower power consumption to execute it even when the high definition mode is set. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a receiving apparatus and a receiving method for receiving an image signal or an audio signal and selecting signal processing to be executed on the received signal from a plurality of signal processings with different power consumption.

  You can switch between a mode that performs basic signal processing on received signals such as image signals and audio signals, and a mode that performs additional signal processing to achieve higher image quality and sound quality. Television receivers are widespread. For example, a television receiver having a mode for performing image quality processing suitable for an image of a sports program can display an image with higher image quality by selecting the mode when viewing the sports program.

  On the other hand, in recent years, mobile terminals equipped with a function for receiving and reproducing television broadcasts, such as mobile phones compatible with digital terrestrial broadcasting, have been spreading. Such a portable receiver is also desired to have a plurality of modes as described above.

  However, additional content signal processing (hereinafter referred to as “high quality processing”) consumes higher power than basic content processing (hereinafter referred to as “standard quality processing”). An increase in power consumption is not preferable particularly in a portable receiver.

Conventionally, a technique for reducing power consumption in a video signal receiving apparatus is described in Patent Document 1, for example. In this technique, decoding of video data is temporarily stopped when a value indicating poor signal reception quality exceeds a threshold value. By applying this technique to high quality processing, an increase in power consumption can be suppressed.
JP 2006-339872 A

  However, when the technique described in Patent Document 1 is applied, when the high quality processing mode is selected and the reception quality value exceeds the threshold, decoding is stopped and no image is displayed. The user may be uncomfortable. Similar problems can also occur when applied to audio signals.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a receiving apparatus and a receiving method that can reduce power consumption without causing discomfort to the user.

  The receiving apparatus according to the present invention has lower power consumption than the first signal processing and the first signal processing for receiving means for receiving a signal including an image signal or an audio signal and for performing signal processing on the received signal. A configuration is adopted in which signal processing means is selected from the second signal processing in accordance with the reception quality of the received signal.

  According to the receiving method of the present invention, the reception quality calculation step for calculating the reception quality of the signal including the image signal or the audio signal and the signal processing to be executed on the reception signal are performed by the first signal processing and the first signal processing. And a second signal processing with low power consumption, and a signal processing selection step for selecting according to the reception quality of the received signal.

  According to the present invention, it is possible to provide a receiving apparatus and a receiving method that can reduce power consumption without causing discomfort to the user.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 1 of the present invention. The present embodiment is an example applied to a mobile phone having a one-segment reception function, which is one of terrestrial digital broadcasting services.

  First, an outline of 1Seg will be described. One Seg is a broadcasting service using one of 13 segments constituting the frequency band of terrestrial digital broadcasting. On the broadcast station side, image data and audio data of a broadcast program are multiplexed into a transport stream (TS). The transport stream is subjected to predetermined digital modulation including error correction coding, and the digitally modulated signal is up-converted to a desired frequency and transmitted.

  In FIG. 1, receiving apparatus 100 according to the present embodiment includes a tuner 200, a decoded data processing unit 300, and a display unit 400.

  The tuner 200 receives a one-segment broadcast signal, reproduces the original transport stream, and generates a parameter indicating the reception quality of the broadcast signal. The tuner 200 includes an antenna unit 210, a wireless reception unit 220, and a demodulation unit 230. In addition, the demodulation unit 230 includes a reception quality calculation unit 240.

  The antenna unit 210 receives a one-segment broadcasting wave.

  The wireless reception unit 220 receives a one-segment broadcast signal via the antenna unit 210 and performs processing such as down-conversion and A / D conversion on the received signal.

  The demodulator 230 performs digital demodulation including error detection and error correction on the output signal of the radio receiver 220 to reproduce the original transport stream.

  The reception quality calculation unit 240 calculates at least one of a carrier-to-noise ratio (C / N), a bit error rate (BER), reception power, and reception field strength of a reception signal. From the calculated value, a parameter indicating reception quality (hereinafter simply referred to as “reception quality”) is calculated.

  The decoded data processing unit 300 performs a decoding process for separating image data and audio data from the reproduced transport stream, and performs an image quality process corresponding to the reception quality on the separated image data. The decoded data processing unit 300 includes an image quality processing unit 310. The image quality processing unit 310 includes a reception quality determination unit 320 and a high image quality processing selection unit 330.

  The image quality processing unit 310 selects one of a plurality of image quality processing modes with different power consumption (hereinafter referred to as “image quality mode”) according to the reception quality of the broadcast signal, and the processing of the selected image quality mode is separated. Execute on image data. The multiple image quality modes include, for example, a standard mode that performs only basic content image quality processing (hereinafter referred to as “standard image quality processing”), and an image quality suitable for sports programs by performing image quality processing that includes additional content. Including sports mode that realizes. Hereinafter, the image quality process including the additional content is referred to as “high image quality process” as appropriate, and the image quality mode for executing the image quality process is referred to as “high image quality mode”.

  The reception quality determination unit 320 compares the reception quality of the broadcast signal with the first threshold value to determine whether to perform the decoding process, and the second threshold value that is higher than the first threshold value. It is determined whether to perform high image quality processing or standard image quality processing.

  The high image quality processing selection unit 330 sets the image quality mode to be applied to the transport stream being received based on the program type and user designation. The high image quality processing selection unit 330 selects the set high image quality mode when the high image quality mode is set and the reception quality determination unit 320 determines to perform the high image quality processing. When the reception quality determination unit 320 determines that standard image quality processing is to be performed, the standard mode is selected even if the set image quality mode is the high image quality mode. Then, image quality processing corresponding to the selected image quality mode is executed on the image data.

  The high image quality processing selection unit 330 has a digital signal processor (DSP, not shown) for each processing type in order to perform image quality processing. Then, the high image quality processing selection unit 330 switches the image quality mode by changing the combination of DSPs to be used. Since each DSP operates by consuming power individually, the power consumption of the image quality processing varies depending on the image quality mode. The image quality processing can also be realized by software processing, but in this case as well, since the processing amount of a CPU (central processing unit) varies depending on the type of processing, the power consumption similarly varies depending on the image quality mode.

  FIG. 2 is a diagram illustrating an example of the relationship between the image quality mode and power consumption in the receiving apparatus according to the present embodiment.

  As shown in FIG. 2, the receiving apparatus 100 has four image quality modes: a standard mode, a sports mode, a cinema mode, and a dynamic mode. The sport mode, cinema mode, and dynamic mode are high image quality modes. The decoded data processing unit 300 executes image quality processing suitable for a sports program in the sports mode, performs image quality processing suitable for a movie program in the cinema mode, and executes image quality processing that gives a lively feeling to the display image in the dynamic mode. .

  Specific types of image quality processing include, for example, contrast improvement and histogram flattening, which are types of density conversion, filtering using a smoothing filter, filtering using a feature extraction filter, and a sharpening filter. An example is filtering. The high image quality processing selection unit 330 has a DSP for each of these processes, and switches the image quality mode by switching the combination of DSPs to be used.

  Therefore, the power consumption of the image quality processing varies depending on the image quality mode. As a result, as shown in FIG. 2, the average power of the receiving device 100 and the viewing time that can be used with the same amount of electricity differ for each image quality mode. Here, the standard mode uses the least amount of DSP for the image signal, the average power is the lowest, and the viewing time is the longest. That is, in the standard mode, power consumption can be reduced compared to the high image quality mode.

  The display unit 400 of FIG. 1 includes a liquid crystal panel (not shown) and displays image data as an image. The display unit 400 includes a speaker (not shown) and outputs audio data as audio.

  The operation of receiving apparatus 100 having the above configuration will be described below. First, the basic concept of the present invention will be described.

  FIG. 3 is a diagram for explaining the relationship between the received radio wave quality, the availability of image viewing, and the processing effect of high image quality processing.

  As shown in FIG. 3, when the received radio wave quality is worse than the first level 501-1, the degree of viewability 502 is low, and the content of the image cannot be determined. Further, when the received radio wave quality is better than the first level 501-1, it is possible to determine the content of the image even if the image quality is bad.

  In this case, when the received radio wave quality is worse than the first level 501-1, image data is not displayed, and when the received radio wave quality is better than the first level 501-1, the received radio wave quality is displayed. Regardless of the degree, it is desirable to display the image data on the display unit 400.

  Therefore, the receiving apparatus 100 does not decode image data in the first area 504-1 where the received radio wave quality is worse than the first level 501-1, and the received radio wave quality is lower than the first level 501-1. In the case of a good area, the image data is decoded.

  Normally, if the received radio wave quality is not good to some extent, no difference is observed in the image quality of the display image between when the high image quality process is performed and when it is not performed. Here, when the received radio wave quality is worse than the second level 501-2, the degree 503 of the processing effect of the high image quality processing is low, and the image quality of the display image is the case where the high image quality processing is not performed. No difference shall be recognized. When the received radio wave quality is better than the second level 501-2, it is assumed that there is a difference in the image quality of the display image between when the high image quality process is performed and when it is not performed.

  In this case, it is desirable not to perform the high image quality processing in the second area 504-2 where the received radio wave quality is worse than the second level 501-2. As described with reference to FIG. 2, the high image quality processing consumes higher power than the standard image quality processing, and the execution of the high image quality processing in the second area 504-2 consumes unnecessarily high power. Because it becomes. On the other hand, in the third area 504-3 in which the received radio wave quality is better than the second level 501-2, when the high image quality process is set, the high image quality process is performed regardless of the level of the received radio wave quality. Is desirable.

  Therefore, the receiving apparatus 100 performs high-quality image data processing in the second area 504-2 where the received radio wave quality is better than the first level 501-1 and worse than the second level 501-2. In the third area 504-3 where the received radio wave quality is better than the second level 502-1, the image data is subjected to high image quality processing.

  Based on the above idea, the receiving apparatus 100 operates as follows.

  The radio reception unit 220 in FIG. 1 receives a one-segment broadcast signal transmitted from a transmitting station, performs processing such as down-conversion and A / D conversion on the received signal, and performs orthogonal frequency division multiplexing (OFDM). (Division multiplexing) signal is extracted. Radio receiving section 220 then outputs the extracted OFDM signal to demodulation section 230.

  The demodulator 230 performs OFDM demodulation, digital demodulation including error detection and error correction on the input OFDM signal, reproduces the original transport stream, and outputs it to the decoded data processor 300.

  The reception quality calculation unit 240 calculates at least one of the carrier-to-noise ratio, the bit error rate, the reception power, and the reception electric field strength in the process of digital demodulation by the demodulation unit 230, and calculates the reception quality from the calculated value. . Reception quality calculation section 240 then outputs the calculated reception quality to reception quality determination section 320 of decoded data processing section 300.

  The reception quality determination unit 320 compares the input reception quality with a first threshold value corresponding to the first level 501-1 in FIG. 3, and for the transport stream input to the decoded data processing unit 300 It is determined whether or not the decoded data processing unit 300 performs the decoding process. Also, the reception quality judgment unit 320 compares the input reception quality with a second threshold value corresponding to the second level 501-2 in FIG. 3, and the decoded data processing unit 300 performs decoding processing from the transport stream. It is determined whether to perform high image quality processing or standard image quality processing on the separated image data. Then, the reception quality determination unit 320 notifies the determination result to the high image quality processing selection unit 330. The first threshold value and the second threshold value may be set in advance, for example, values acquired by changing the reception quality of the transport stream and allowing the viewer to evaluate the display image. The second threshold may be set for each type of high image quality mode.

  When the reception quality determination unit 320 determines to perform decoding processing, the decoded data processing unit 300 performs decoding processing on the input transport stream and separates image data from the transport stream.

  The high image quality processing selection unit 330 sets an image quality mode to be applied to the transport stream being received. For example, the high image quality processing selection unit 330 stores in advance a table in which various program types are associated with image quality modes to be applied to the respective program types, and extracts the program types from the transport stream. Referring to FIG. 4, the corresponding image quality mode is set to the image quality mode to be applied to the transport stream. Further, for example, the high image quality processing selection unit 330 may accept selection of an image quality mode by operating a key switch from a user, and set the selected image quality mode to an image quality mode to be applied to a transport stream. The high image quality mode may be set every time the broadcast program to be viewed is switched.

  When the high image quality mode is set and the reception quality determination unit 320 determines that the high image quality processing is to be performed, the high image quality processing selection unit 330 corresponds to the set high image quality mode. And the corresponding image quality processing is performed on the separated image data. On the other hand, when it is determined that the reception quality determination unit 320 performs the standard image quality processing, the high image quality processing selection unit 330 supports the standard image quality processing, that is, the standard mode for the separated image data regardless of the setting mode. The image quality processing to be performed is selected, and the corresponding image quality processing is performed on the separated image data.

  When the image quality mode is designated by the user by operating the key switch, the high image quality processing selection unit 330 preferentially selects the designated image quality mode regardless of the determination result of the reception quality determination unit 320. May be.

  The decoded data processing unit 300 outputs the image data on which the image quality processing has been performed to the display unit 400.

  The display unit 400 displays the input image data on a liquid crystal display. In the display unit 400, only the image whose contents can be discriminated is displayed by the processing of the image quality processing unit 310 described above, and the image that has been positively subjected to high image quality processing within a range where the processing effect can be obtained is displayed. .

  Next, the overall operation flow of the decoded data processing unit 300 will be described.

  FIG. 4 is a flowchart showing the operation of the decoded data processing unit 300.

  In step S1100, reception quality determination section 320 determines whether the reception quality is equal to or higher than the first threshold value. If the reception quality is less than the first threshold, that is, if an image whose contents can be determined cannot be obtained from the transport stream (S1100: NO), the reception quality determination unit 320 determines that the decoding process is not performed, The process proceeds to S1200. On the other hand, when the reception quality is equal to or higher than the first threshold, that is, when an image whose contents can be discriminated can be obtained from the transport stream (S1100: YES), the reception quality determination unit 320 determines to perform the decoding process, The process proceeds to S1300.

  In step S1200, the decoded data processing unit 300 stops the decoding process of the transport stream and returns to step S1100. If the decoding process of the transport stream is in a stopped state, the decoded data processing unit 300 continues that state and returns to step 1100.

  When the reception quality is less than the first threshold value, the processes in steps S1100 and S1200 are repeated. During this time, the decoding process is not performed, and the one-segment image is not displayed on the display unit 400. Thereby, useless decoding processing and image display can be reduced, and power consumption can be suppressed.

  In step S1300, the decoded data processing unit 300 starts the decoding process of the transport stream and separates the image data from the transport stream. The decoded data processing unit 300 continues the state when the transport stream decoding process is being executed.

  In step S1400, reception quality determination section 320 determines whether the high image quality mode is set and the reception quality is equal to or higher than the second threshold value. The reception quality determination unit 320 performs the high image quality processing when the high image quality mode is set and the reception quality is equal to or higher than the second threshold, that is, the effect of the high image quality processing can be obtained (S1400: YES). And the process proceeds to step S1500. On the other hand, when the standard mode is set or the high image quality mode is set, the reception quality determination unit 320 is less than the second threshold, that is, when the effect of the high image quality processing cannot be obtained. (S1400: NO), it is determined that standard image quality processing is to be performed, and the process proceeds to step S1600.

  In step S1500, the high image quality processing selection unit 330 performs the high image quality processing in the set high image quality mode on the separated image data. The image data that has been subjected to the high image quality processing is output to the display unit 400.

  In step S1600, the high image quality processing selection unit 330 performs the image quality processing in the standard mode, that is, the image quality processing in the image quality mode with the least power consumption, on the separated image data. The image data that has undergone image quality processing is output to the display unit 400.

  In step S1700, the decoded data processing unit 300 determines whether there is a setting to stop display of image data. For example, when there is an instruction to end viewing of 1Seg by operating a key switch, display of image data is set to be stopped. If there is no stop setting (S1700: NO), the decrypted data processing unit 300 returns to step S1100, and if there is a stop setting (S1700: YES), the series of processing ends.

  When there is no stop setting and the reception quality is equal to or higher than the second threshold value, the process of step S1500 is repeated. While the process of step S1500 is repeated, the set high-quality mode is performed, and an image with a higher quality than that in the case of applying the standard mode is displayed.

  On the other hand, when there is no stop setting and the reception quality is equal to or higher than the first threshold and lower than the second threshold, the process of step S1600 is repeated. While the process of step S1600 is repeated, the image quality process in the standard mode is executed, and an image with an image quality corresponding to the reception quality is displayed. As a result, it is possible to prevent useless image quality processing from being performed, and to reduce power consumption. Further, when the reception quality recovers to the second threshold or higher, the mode is changed to the high image quality mode, and the high image quality processing function is turned on.

  Note that the determination process of step S1400 may be performed before the process of S1300.

  As described above, according to the present embodiment, when the reception quality is such that an image can be output with a better image quality in the high image quality mode than in the standard mode, the high image quality mode is applied and the high image quality processing function is applied. turn on. When the reception quality is such that there is no great difference in image quality between the standard mode and the high image quality mode, the standard mode with lower power consumption is applied and the image quality processing function is turned off. Thereby, power consumption can be suppressed without particularly degrading the display image quality, and power consumption can be reduced without causing discomfort to the user.

  In addition, since the reception quality is determined based on the signal before the image quality processing is executed, the display image quality can be predicted based on the reception quality and the image quality mode can be switched. Switching and image display can be turned on and off.

  Further, since the reception quality is determined based on the signal before the decoding process is performed, the decoding process can be turned on / off according to the reception quality, and the power consumption can be further reduced.

(Embodiment 2)
By switching between standard sound quality processing, which is basic sound quality processing, and high sound quality processing, which realizes higher sound quality, depending on the reception quality of the transport stream, users are particularly uncomfortable. It is possible to reduce power consumption without giving

  FIG. 5 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 2 of the present invention, and corresponds to FIG. 1 of Embodiment 1. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

  In FIG. 5, receiving apparatus 600 according to the present embodiment has decoded data processing section 700 having a configuration different from that of decoded data processing section 300 in FIG. 1. The decoded data processing unit 700 includes a sound quality processing unit 710. The sound quality processing unit 710 includes a reception quality determination unit 720 and a high sound quality processing selection unit 730.

  The decoded data processing unit 700 separates audio data from the transport stream reproduced by the tuner 200 by decoding processing, and executes sound quality processing corresponding to the reception quality on the separated audio data.

  The sound quality processing unit 710 selects one of a plurality of sound quality processing modes with different power consumption (hereinafter referred to as “sound quality mode”) according to the reception quality of the broadcast signal, and the processing of the selected sound quality mode is separated. Execute on audio data. The plurality of sound quality modes include, for example, a standard mode for performing only standard sound quality processing and a cinema mode for realizing sound quality suitable for a movie program by performing sound quality processing including additional contents. Hereinafter, the sound quality processing including the above additional content is referred to as “high sound quality processing” as appropriate, and the sound quality mode for executing the high sound quality processing is referred to as “high sound quality mode”.

  Here, when the received radio wave quality is worse than the third level, the content of the voice cannot be determined, and when the received radio wave quality is better than the third level, even if the voice quality is bad, the voice quality is not good. Assume that the contents can be determined. In this case, when the received radio wave quality is better than the third level, it is desirable to decode the audio data and output the audio on the display unit 400 regardless of the level of the received radio wave quality.

  On the other hand, normally, if the received radio wave quality is not good to some extent, there is no difference in the sound quality of the output sound between when the high sound quality process is performed and when it is not performed. Here, when the received radio wave quality is worse than the fourth level, it is assumed that there is no difference in the sound quality of the output sound between the case where the high sound quality processing is performed and the case where it is not performed. When the received radio wave quality is better than the fourth level, it is assumed that there is a difference in the sound quality of the output sound between when the high sound quality process is performed and when it is not performed. In this case, when the received radio wave quality is better than the fourth level, it is desirable to perform high sound quality processing regardless of the level of the received radio wave quality.

  The reception quality determination unit 720 determines whether or not to perform decoding processing by comparing the reception quality of the broadcast signal with a third threshold value corresponding to the third level, and determines the reception quality of the broadcast signal as the fourth quality. It is determined whether to perform high sound quality processing or standard sound quality processing in comparison with a fourth threshold value corresponding to the level. For the third threshold value and the fourth threshold value, for example, values acquired by changing the reception quality of the transport stream and allowing the viewer to evaluate the output sound may be set in advance. The fourth threshold value may be set for each type of high sound quality mode.

  The high sound quality processing selection unit 730 sets the sound quality mode to be applied to the transport stream being received based on the program type and user designation. The high sound quality processing selection unit 730 selects the set high sound quality mode when the high sound quality mode is set and the reception quality determination unit 720 determines that high sound quality processing is to be performed. When the reception quality determination unit 720 determines that standard sound quality processing is to be performed, the standard mode is selected even if the set sound quality mode is the high sound quality mode. Then, sound quality processing corresponding to the selected sound quality mode is executed on the sound data.

  In order to perform sound quality processing, the high sound quality processing selection unit 730 has a DSP (not shown) for each type of processing, and switches the sound quality mode by changing the combination of DSPs to be used. Since each DSP operates by consuming power individually, the power consumption of the sound quality processing varies depending on the sound quality mode. Note that the sound quality processing can also be realized by software processing, but in this case as well, since the processing amount of the CPU is different for each type of processing, the power consumption similarly varies depending on the sound quality mode.

  For example, the receiving apparatus 600 has four sound quality modes: a standard mode, a sports mode, a cinema mode, and a dynamic mode. The sports mode, cinema mode, and dynamic mode are high sound quality modes. The decoded data processing unit 700 executes sound quality processing suitable for sports programs in the sports mode, performs sound quality processing suitable for movie programs in the cinema mode, and performs sound quality processing that gives a dynamic feeling to the output sound in the dynamic mode. .

  Specific types of sound quality processing include, for example, high-frequency audio processing, low-frequency audio processing, and surround processing, which are types of audio processing. The high sound quality processing selection unit 730 has a DSP for each processing of the sound processing, and switches the sound quality mode by switching the combination of DSPs to be used.

  Therefore, the power consumption of sound quality processing varies depending on the sound quality mode, and as a result, the average power of the receiving apparatus 600 and the viewing time that can be used with the same amount of electricity differ for each sound quality mode. Here, in the standard mode, the average power is the lowest and the viewing time is the longest. That is, in the standard mode, the power consumption can be reduced compared to the high sound quality mode.

  The operation of receiving apparatus 600 having the above configuration will be described below.

  The reception quality determination unit 720 compares the input reception quality with the third threshold value, and determines whether or not the decoded data processing unit 700 performs decoding processing on the transport stream input to the decoded data processing unit 700 Determine whether. Also, the reception quality determination unit 720 compares the input reception quality with the fourth threshold value, and performs high sound quality processing on the audio data separated from the transport stream by the decoding processing in the decoded data processing unit 700. It is determined which of the standard sound quality processing is performed, and the determination result is notified to the high sound quality processing selection unit 730.

  When the reception quality determination unit 720 determines that decoding processing is to be performed, the decoded data processing unit 700 performs decoding processing on the input transport stream and separates audio data from the transport stream.

  The high sound quality processing selection unit 730 sets a sound quality mode to be applied to the transport stream being received. For example, the high sound quality processing selection unit 730 stores in advance a table in which various program types are associated with sound quality modes to be applied to the respective program types, and extracts the program types from the transport stream. Referring to FIG. 4, the corresponding sound quality mode is set to the sound quality mode to be applied to the transport stream. In addition, for example, the high sound quality processing selection unit 730 may accept selection of a sound quality mode by operating a key switch from the user, and set the selected sound quality mode to a sound quality mode applied to a transport stream. The sound quality mode may be set every time the broadcast program to be viewed is switched.

  When the high sound quality mode is set and the reception quality determination unit 720 determines that the high sound quality processing is to be performed, the high sound quality processing selection unit 730 performs the high sound quality processing corresponding to the set high sound quality mode. And the corresponding high sound quality processing is performed on the separated audio data. On the other hand, when it is determined that the reception quality determination unit 720 performs standard sound quality processing, the high sound quality processing selection unit 730 performs standard sound quality processing on the separated sound data, that is, the sound quality of the standard mode, regardless of the setting mode. Process.

  When the sound quality mode is designated by the user by operating the key switch, the high sound quality processing selection unit 730 preferentially selects the designated sound quality mode regardless of the determination result of the reception quality determination unit 720. May be.

  The decoded data processing unit 700 outputs the audio data subjected to the sound quality processing to the display unit 400.

  The display unit 400 outputs the input audio data as audio from a speaker. From the display unit 400, only the sound whose contents can be discriminated is output by the processing of the sound quality processing unit 710, and the sound that has been positively processed with high sound quality within the range where the processing effect can be obtained is output. The

  Next, the overall operation flow of the decoded data processing unit 700 will be described.

  FIG. 6 is a flowchart showing the operation of the decoded data processing unit 700.

  In step S2100, reception quality determination section 720 determines whether or not the reception quality is greater than or equal to a third threshold value. When the reception quality is less than the third threshold, that is, when the audio whose content can be determined cannot be obtained from the transport stream (S2100: NO), the reception quality determination unit 720 determines that the decoding process is not performed, The process proceeds to S2200. On the other hand, if the reception quality is greater than or equal to the third threshold, that is, if the audio whose content can be determined is obtained from the transport stream (S2100: YES), the reception quality determination unit 720 determines that the decoding process is to be performed, The process proceeds to S2300.

  In step S2200, the decoded data processing unit 700 stops the decoding process of the transport stream and returns to step S2100. If the decoding process of the transport stream is in a stopped state, the decoded data processing unit 700 continues that state and returns to step S2100.

  When the reception quality is less than the third threshold value, the processes of steps S2100 and S2200 are repeated. During this time, the decoding process is not performed and the one-segment audio is not output from the display unit 400. Thereby, useless decoding processing and audio output can be reduced, and power consumption can be suppressed.

  In step S2300, the decoded data processing unit 700 starts decoding of the transport stream and separates audio data from the transport stream. The decoded data processing unit 700 continues the state when the transport stream decoding process is being executed.

  In step S2400, reception quality determination section 720 determines whether the high sound quality mode is set and the reception quality is equal to or higher than a fourth threshold value. The reception quality determination unit 720 performs high sound quality processing when the high sound quality mode is set and the reception quality is equal to or higher than the fourth threshold, that is, the effect of high sound quality processing can be obtained (S2400: YES). And the process proceeds to step S2500. On the other hand, the reception quality judgment unit 720 determines that the standard mode is set or the high sound quality mode is set, but the reception quality is less than the fourth threshold, that is, the effect of the high sound quality processing cannot be obtained. (S2400: NO), it is determined that standard sound quality processing is to be performed, and the process proceeds to step S2600.

  In step S2500, the high sound quality processing selection unit 730 performs the high sound quality processing in the set high sound quality mode on the separated sound data. The sound data that has been subjected to the high sound quality processing is output to the display unit 400.

  In step S2600, the high sound quality processing selection unit 730 performs the sound quality processing in the standard mode, that is, the sound quality processing in the sound quality mode with the minimum power consumption, on the separated audio data. The sound data that has been subjected to the sound quality processing is output to the display unit 400.

  In step S <b> 2700, decoded data processing section 700 determines whether there is a setting for stopping audio output of audio data. For example, when there is an instruction to end viewing of 1Seg by operating a key switch, stop of audio output of audio data is set. When there is no stop setting (S2700: NO), the decrypted data processing unit 700 returns to step S2100, and when there is a stop setting (S2700: YES), the series of processing ends.

  When there is no stop setting and the reception quality is equal to or higher than the fourth threshold value, the process of step S2500 is repeated. While the processing in step S2500 is repeated, the high sound quality processing in the set high sound quality mode is performed, and sound with higher sound quality than that in the case of applying the standard mode is output.

  On the other hand, when there is no stop setting and the reception quality is greater than or equal to the third threshold value and less than the fourth threshold value, the process of step S2600 is repeated. While the process of step S2600 is repeated, the sound quality process in the standard mode is executed, and the sound quality sound corresponding to the reception quality is displayed. Thereby, useless high sound quality processing can be prevented from being performed, and power consumption can be suppressed. Further, when the reception quality recovers to the fourth threshold or higher, the high sound quality mode is entered and the high sound quality processing function is turned on.

  Note that the determination process in step S2400 may be performed before the process in step S2300.

  As described above, according to the present embodiment, the high sound quality mode is applied and the high sound quality processing function is applied when the reception quality is such that the high sound quality mode can output sound with better sound quality than the standard mode. turn on. When the reception quality is such that there is no great difference in sound quality between the standard mode and the high sound quality mode, the standard mode with lower power consumption is applied and the high sound quality processing function is turned off. Thereby, power consumption can be suppressed without particularly deteriorating the output sound quality, and power consumption can be reduced without particularly discomforting the user.

  Also, since the reception quality is determined based on the signal before the sound quality processing is performed, the output sound can be predicted from the reception quality and the sound quality mode can be switched, and the sound quality mode can be switched accurately following the change in the sound quality of the output sound. Switching and audio output can be turned on and off.

  Further, since the reception quality is determined based on the signal before the decoding process is performed, the decoding process can be turned on / off according to the reception quality, and the power consumption can be further reduced.

  In addition to sound processing such as high-frequency sound processing, there are sound volume processing that affects power consumption, such as volume change processing, sound range change processing, and processing for changing the number of speakers used when multiple speakers are provided. . The sound quality processing unit 710 may associate each of these processes with each sound quality mode.

  Further, the sound quality processing unit 710 of the present embodiment may be provided in the receiving apparatus 100 of the first embodiment. In this case, the image quality processing and the sound quality processing are combined, and after setting the reception quality threshold value based on the effect of the combined image quality processing and the relationship between the sound quality processing and the power consumption, the image quality processing is performed. A combination of sound quality processing and sound quality processing may be selected and executed.

  In each of the embodiments described above, the present invention is applied to a mobile phone having a one-segment reception function. However, the present invention is not limited to this. For example, PDA (personal digital assistant), personal computer equipped with one-seg reception function, television receivers with digital terrestrial broadcast reception function, etc. Multiple signal processing with different power consumption for received image signal or audio signal Can be applied to various receiving apparatuses that selectively execute.

  The receiving apparatus and the receiving method according to the present invention are useful as a receiving apparatus and a receiving method that can reduce power consumption without causing discomfort to the user.

The block diagram which shows the structure of the receiver which concerns on Embodiment 1 of this invention. FIG. 10 is a diagram illustrating an example of a relationship between an image quality mode and power consumption in the receiving apparatus according to Embodiment 1 The figure explaining the relationship between the received radio wave quality, the availability of image viewing, and the processing effect of high image quality processing in the first embodiment Flowchart showing the operation of the decoded data processing unit in the first embodiment The block diagram which shows the structure of the receiver concerning Embodiment 2 of this invention Flowchart showing the operation of the decoded data processing unit in the second embodiment.

Explanation of symbols

100, 600 Receiver 200 Tuner 300, 700 Decoded data processing unit 400 Display unit 210 Antenna unit 220 Wireless receiving unit 230 Demodulating unit 240 Reception quality calculation unit 300 Decoded data processing unit 310 Image quality processing unit 320, 720 Reception quality determination unit 330 High Image quality processing selection unit 710 Sound quality processing unit 730 High sound quality processing selection unit

Claims (5)

Receiving means for receiving a signal including an image signal or an audio signal;
Signal processing means for selecting signal processing to be performed on the received signal from the first signal processing and the second signal processing, which consumes less power than the first signal processing, according to the reception quality of the received signal; ,
A receiving apparatus. The signal processing means includes
When execution of the first signal processing is specified, either the first signal processing or the second signal processing is selected according to the reception quality, and the execution of the second signal processing is performed. When specified, select the second signal processing;
The receiving device according to claim 1. The signal processing means includes
When the reception quality is higher than the quality of the image or sound obtained by the second signal processing, the quality of the image or sound obtained by the first signal processing is selected. When the reception quality is not the above level, the second signal processing is selected.
The receiving device according to claim 1. Decoding means for decoding the image signal or the audio signal from the received signal;
Reception quality calculation means for calculating the reception quality from the received signal before decoding;
The receiving device according to claim 1, further comprising: A reception quality calculating step for calculating a reception quality of a signal including an image signal or an audio signal;
A signal processing selection step of selecting signal processing to be executed on the received signal from the first signal processing and the second signal processing having lower power consumption than the first signal processing according to the reception quality of the received signal. When,
Receiving method.

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