JP2004343210A - Digital receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital receiver whose reception mode can automatically be switched in response to a reception state and an operation of the receiver. <P>SOLUTION: The digital receiver provided with a demodulation section 23 for processing received signals received from two tuners 8, 9 by two systems of decoding sections 18, 19 and operated through the selection of a double tuner reception mode or a diversity reception mode, is provided with a diversity control means 22 controlled by an output of a reception state discrimination means 28 so that the switching between the double tuner reception mode and the diversity reception mode is automatically carried out. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital broadcast receiving apparatus that receives a signal transmitted by the orthogonal frequency division multiplexing method, and particularly to a digital receiving apparatus that operates in both a double tuner receiving mode and a diversity receiving mode.
[0002]
[Prior art]
2. Description of the Related Art In an orthogonal frequency division multiplexing (OFDM) digital broadcasting system, a signal received by one antenna is distributed to two systems, and data is transmitted by two tuners and two demodulators. Two types of reception operation modes are used: a double tuner reception mode for demodulation, and a diversity reception mode for selectively combining and receiving signals received by a plurality of antennas.
[0003]
Here, the double tuner reception mode can acquire information on an EPG (Electronic Program Guide) using a tuner not used for two-screen display or viewing, and the diversity reception mode can be used. This is effective when the reception condition of radio waves is degraded, and good reception characteristics can be obtained even when fading occurs.
[0004]
Therefore, a digital broadcast receiver which realizes these two types of reception modes with one integrated circuit and can be mounted on both the receiver in the double tuner reception mode and the receiver in the diversity reception mode is known as a conventional technology. (For example, see Patent Document 1).
[0005]
Therefore, this prior art will be described with reference to FIG. 10. FIG. 10 shows an input system up to a demodulation unit of the prior art, which includes two antennas 4, 5 and two tuners 8, 9. This is combined with a demodulation unit 30.
[0006]
At this time, the demodulation unit 30 includes demodulators 50 and 51, a first changeover switch 52, a second changeover switch 53, a third changeover switch 54, and a control unit 55. , 9 are supplied to the inputs of respective demodulators 50, 51.
[0007]
When the demodulation unit 30 is mounted on a receiver in the double tuner reception mode, both the first changeover switch 52 and the second changeover switch 53 are switched to the a contact, and the third The changeover switch 54 is used by switching to a contact b.
[0008]
As a result, the output of the modulator 50 is led to the first external output terminal 56, and the output of the second demodulator 51 is led to the second external output terminal 57. As a result, as described above, 2 It is possible to obtain a screen display or obtain information on the EPG using a tuner not used for viewing.
[0009]
On the other hand, when the demodulation unit 30 is mounted on a receiver in the diversity reception mode, the first changeover switch 52 switches to the b-contact, the third changeover switch 54 switches to the a-contact, and the second changeover switch 53 Is switched to the b contact and used.
[0010]
As a result, both the output of the first demodulator 50 and the output of the second demodulator 51 are input to the control means 55, and the output of the control means 55 is led out to the first external output terminal 56.
[0011]
At this time, the control means 55 includes a circuit for selecting an error-free one of the output of the first demodulator 50 and the output of the second demodulator 51. As a result, as described above, good reception characteristics can be maintained even when the reception state of radio waves is deteriorated or fading occurs.
[0012]
[Patent Document 1]
JP-A-2003-8482
[0013]
[Problems to be solved by the invention]
The above prior art does not consider switching between two types of reception modes according to the reception state of radio waves and the operation of the receiver, and has a problem in effective use of the reception function.
[0014]
The present invention has been made in view of such a situation, and an object of the present invention is to provide a digital receiver in which a reception mode is automatically switched according to a reception state or an operation of a receiver. .
[0015]
[Means for Solving the Problems]
The object is to provide a digital receiving apparatus having a plurality of tuners and operating by switching a receiving mode between a double tuner receiving mode and a diversity receiving mode, wherein a receiving mode control unit is provided, and the double tuner receiving mode and the diversity receiving mode are provided. Is automatically performed by the reception mode control means.
[0016]
At this time, there is further provided reception state determination means for determining a reception state based on a state of a signal received by the tuner, and the reception mode control means is controlled according to a determination result of the reception state determination means. In any case, the above object can be achieved.
[0017]
Here, the reception state determination means may further provide a determination result according to at least any one of an error rate of a received signal, a reception strength, a signal level, an AGC control level, a noise level, and the presence or absence of an error after error correction processing. Even so, the above object can be achieved.
[0018]
Also, here, means for further switching between the external antenna terminal and the internal antenna terminal,
External antenna detection means for detecting an input from the external antenna terminal, wherein the reception mode control means detects a double tuner reception when a signal input from the external antenna terminal is detected by the external antenna detection means. Even if the mode is switched to the mode, the above object can be achieved.
[0019]
At this time, the above-mentioned object can be achieved even if the receiving mode control means switches to the diversity receiving mode when the receiving state determining means determines that the receiving state has deteriorated.
[0020]
Further, at this time, the above-mentioned object is achieved even if a means for connecting a plurality of external antennas is provided. Here, the reception mode control means controls the connection of the external antenna by the external antenna detection means. The above object can be achieved by switching to the diversity receiving mode when no signal is detected.
[0021]
Further, the above-mentioned object is achieved even when the reception mode control means switches the mode to the double tuner reception mode when the reception state determination means determines that the reception state is good. The above-mentioned object is also achieved when the switching to is started, and the acquisition of the information on the broadcast is started using a tuner not used for viewing.
[0022]
Further, the above-mentioned object is achieved even when the reception mode control means selects one of the diversity reception mode and the double tuner reception mode according to the function of the receiver. The above object is achieved even if the control means selects one of the diversity reception mode and the double tuner reception mode according to a manual operation.
[0023]
Further, here, the object is achieved by providing a means for notifying the user of which of the double-tuner reception mode and the diversity reception mode the user is viewing in the reception mode. The notifying means is constituted by means for displaying at least one of a character and a graphic inside the screen, or is constituted by a light emitting element provided outside the screen, or is constituted by notifying means by voice, and further means for moving the internal antenna The above object is also achieved by providing a means for manually turning on / off the operation of the notification means.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a digital receiver according to the present invention will be described in detail with reference to the illustrated embodiments.
[0025]
First, FIG. 1 shows a first embodiment of the present invention, which includes a demodulation unit 23, and an external antenna 1 and an external antenna detection unit 2, a distributor 3, a first internal antenna 4, a second internal antenna An antenna 5, a first antenna switching means 6, a second antenna switching means 7, and two tuners, that is, a first tuner 8 and a second tuner 9 are provided.
[0026]
Here, first, the external antenna 1 is, for example, a directional antenna (Yagi antenna) installed at a high place outdoors. At this time, the external antenna detection means 2 detects that the external antenna 1 is connected, and It serves to generate signal A.
[0027]
At this time, the distributor 3 functions to distribute the signal received by the external antenna 1 to the first antenna switching means 6 and the second antenna switching means 7.
[0028]
On the other hand, the first internal antenna 4 and the second internal antenna 5 are, for example, two whip antennas built in a television receiver, and are respectively a first antenna switching means 6 and a second antenna switching means. 7 as it is.
[0029]
Next, the first antenna switching means 6 and the second antenna switching means 7 are both constituted by electronic switching circuits, and are controlled by switching signals B and C to select one of the inputs of the two circuits. It works to output.
[0030]
First, the first antenna switching means 6 selects one of the broadcast wave received by the first internal antenna 4 and the broadcast wave received by the external antenna 1 and inputs the selected broadcast wave to the first tuner 8. Then, the second antenna switching means 7 selects one of the broadcast wave received by the second internal antenna 5 and the broadcast wave received by the external antenna 1, and selects the second tuner. Used to enter 9.
[0031]
The first tuner 8 and the second tuner 9 work to select the RF signal input from each antenna and convert the frequency to an IF signal, and output from these tuners 8 and 9. The IF signals are input to the demodulation unit 23, respectively.
[0032]
At this time, each IF signal input to the demodulation unit 23 is first digitized by the first and second A / D conversion units 10 and 11, and then to the first and second quadrature detection units 12 and 13. The signal is then demodulated into a baseband signal and supplied to the first and second FFT units 14 and 15.
[0033]
Therefore, the first and second FFT units 14 and 15 Fourier-transform the respectively input signals, and the Fourier-transformed signals are subjected to transmission path distortion by the first and second equalization processing units 16 and 17. After being compensated, they are input to the first and second decoding units 18 and 19, where they are subjected to demapping and error correction, and output from the demodulation unit 23 as demodulated data.
[0034]
The data output from the demodulation unit 23 is input to the DEMUX CPU 24, where it is separated into video data and audio data. The video data is input to the video decoder 26, where it is decoded into a video output, and the audio data is input into the audio decoder 27, where it is decoded into an audio output.
[0035]
Then, by supplying the video output and the audio output to the television receiver, the image is reproduced on the monitor and the audio is reproduced from the speaker, so that the function as the digital receiving device is obtained.
[0036]
Next, the operation of this embodiment will be described. The demodulation unit 23 according to this embodiment is provided with a control unit 20, a selection unit 21, and a diversity control unit 22 in addition to the above.
[0037]
As a result, the diversity control means 22 can arbitrarily select the operation as the receiver in the double tuner reception mode and the operation as the receiver in the diversity reception mode.
[0038]
Therefore, the switching process according to the first embodiment of the present invention will be described first. In FIG. 1, the selection unit 21 controls the diversity control unit 22 so that the diversity control unit 22 operates as the reception mode control unit, One of the reception mode and the diversity reception mode is selected. The control means 20 will be described later.
[0039]
Here, first, when the selection unit 21 selects the double tuner reception mode, the diversity control unit 22 performs the above-described series of processing from reception to decoding by the antenna independently in both the first and second processing systems. The control is performed so that output data independent from both the first decoding unit 18 and the second decoding unit 19 is supplied to the DEMUX CPU 24.
[0040]
On the other hand, when the selection unit 21 selects the diversity reception mode, the diversity control unit 22 weights and combines the signals equalized by the first and second equalization processing units 16 and 17, and performs the first synthesis. To the decoding unit 18 or the second decoding unit 19.
[0041]
At this time, the diversity control means 22 may select and demodulate only the signal having the better reception state.
[0042]
According to this embodiment, the switching between the diversity reception mode and the double tuner reception mode is automatically given by the diversity control means 22 according to the selection result of the selection means 21, so that the effective use of the reception function is achieved. Can be achieved.
[0043]
Next, a reception mode switching process according to the second embodiment of the present invention will be described with reference to FIG. Here, in the embodiment of FIG. 2, the reception state determination unit 28 is further provided in the demodulation unit 23 in the embodiment of FIG. 1, and the other configuration is the same.
[0044]
Then, the reception state determination means 28 determines whether the reception state is good or deteriorated from the data demodulated by the first and second decoding units 18 and 19.
[0045]
Here, if the reception state determination means 28 determines that it is better to switch from the double tuner reception mode to the diversity reception mode, the selection means 21 performs control to switch to the diversity reception mode, and the diversity control means 22 operates.
[0046]
Therefore, the diversity control unit 22 weights and combines the output signals of the first equalization processing unit 16 and the second equalization processing unit 17 and combines the output signals with the first decoding unit 18 or the second decoding unit. 19 is output.
[0047]
At this time, of the output signals of the first equalization processing unit 16 and the second equalization processing unit 17, only the signal having the better reception characteristic may be selected and output.
[0048]
On the other hand, when the reception state determination unit 28 determines that it is better to switch from the diversity reception mode to the double tuner reception mode, the selection unit 21 stops the operation of the diversity control unit 22 and the first equalization processing unit The operation of inputting the output of 16 to the first decoding unit 18 and inputting the output of the second equalization processing unit 17 to the second decoding unit 19 is performed.
[0049]
By controlling in this manner, it is possible to obtain information such as SI for EPG display, display two screens, and the like using a tuner and a demodulation unit not used for viewing.
[0050]
At this time, it is also possible to acquire the respective reception states by the reception state determination means 28, use the one with the better reception state as the main, and use it for viewing.
[0051]
Next, a reception state determination process according to the third embodiment of the present invention will be described with reference to FIG. In this case, in a series of processes from reception to decoding by the above-described antenna, the reception state determination unit 28 determines the power of each received signal, the AGC control level, the error rate of the demodulated signal, the noise level, the error after the error correction process, Is configured to obtain the presence or absence of
[0052]
Then, the reception state determination unit 28 determines whether or not the reception state is good from one or a plurality of pieces of acquired information, and determines whether it is better to switch from the double tuner reception mode to the diversity reception mode. It is determined whether it is better to switch from the diversity reception mode to the double tuner reception mode.
[0053]
At this time, specifically, for example, a threshold (threshold value) serving as a criterion is provided for the reception power, the error rate, the AGC control level, and the noise level, and when the reception power is above the threshold, and when the AGC control level is above the threshold, , When the error rate is below the threshold, when the noise level is below the threshold, when there is no error after error correction processing, etc. What is necessary is just to judge.
[0054]
Next, as a fourth embodiment of the present invention, a process for switching to a double tuner reception mode when an input from an external antenna terminal is detected will be described with reference to FIG.
[0055]
Now, when the RF signal is received by the external antenna 1, the external antenna detecting means 2 provided at the external antenna terminal detects the connection of the external antenna, and the connection signal A indicating that the external antenna is connected is generated. It is supplied to the control means 20.
[0056]
Therefore, the control means 20 supplies a control signal to the selection means 21 to instruct the selection means 21 to operate in the double tuner reception mode, and sends the control signal to the first antenna switching means 6 and the second antenna switching means 7. Supply and switch to the external antenna terminal side.
[0057]
Then, the RF signal received by the external antenna 1 is distributed by the distributor 3 and then switched to the external antenna terminal side by the first and second antenna switching means 6 and 7 for the first and second antennas. The signals are input to tuners 8 and 9.
[0058]
As a result, the received signals are output from the first and second tuners 8 and 9, subjected to A / D conversion processing, quadrature detection processing, FFT processing, and equalization processing, and then decoded by the respective decoding units 18 and 19. , So that an operation of switching to the double tuner reception mode can be obtained.
[0059]
At this time, the reception state judging means 28 may select data having a good reception state and output the selected data as data for main viewing.
[0060]
Normally, when reception is performed by the external antenna 1, it is expected that a good reception state is obtained. Therefore, if the input from the external antenna terminal is detected and switched to the double tuner reception mode as in this embodiment, a two-screen display on the premise of a good reception state or a tuner not used for viewing or listening can be used. Can obtain information.
[0061]
Next, as a fifth embodiment of the present invention, a process of switching to the diversity reception mode when the reception state is deteriorated during the reception operation in the double tuner reception mode during the reception by the external antenna 1 and the reception is performed will be described with reference to FIG. .
[0062]
At this time, the reception state determination unit 28 detects the input from the external antenna terminal by the external antenna detection unit 2, and periodically detects and determines the reception state even when operating in the double tuner reception mode.
[0063]
When the reception state determination unit 28 determines that the reception state is degraded, the selection unit 21 controls the diversity control unit 22 so as to operate by switching from the double tuner reception mode to the diversity reception mode.
[0064]
In this case, the diversity control unit 22 selects or combines the outputs of the first and second equalization processing units 16 and 17 and inputs the output to the first decoding unit 18 or the second decoding unit 19, As a result, the operation is switched to the operation in the diversity reception mode.
[0065]
As described above, when the reception state is deteriorated, the mode is switched to the diversity reception mode, so that the reception characteristics can be improved as compared with the case where decoding is performed using only the signal received by one antenna. .
[0066]
Next, as a sixth embodiment of the present invention, a process of receiving using a plurality of external antennas will be described. Here, FIG. 3 is an example of a configuration for connecting a plurality of external antennas.
[0067]
In FIG. 3, in this embodiment, the first and second antenna switching means 6 and 7 are respectively provided outside the switching contact (1) for inputting the internal antenna and the switching contact (2) for inputting the first external antenna. And a switching contact (3) for inputting a second external antenna.
[0068]
Two external antennas (not shown) different from the external antenna 1 are connected to the second external antenna input switching contact point (3). The other configuration is the same as that of FIG.
[0069]
First, when receiving with only one of the external antennas 1, the first and second antenna switching means 6, 7 are switched to the switching contact (2), and the RF signals distributed by the distributor 3 are transmitted to the tuners 8, 9, respectively. To be entered.
[0070]
Next, when receiving with two external antennas, the first and second antenna switching means 6 and 7 are switched to the switching contact {circle around (3)}, and the RF signals received by the respective external antennas are transmitted to the tuners 8 and 9 respectively. Is to be entered.
[0071]
By performing the switching control in this manner, reception by a plurality of external antennas becomes possible. For example, in an environment where the reception state is likely to deteriorate, the reception state is improved by connecting a plurality of external antennas and performing diversity reception. Will be able to
[0072]
In this example, a case has been described where the first and second antenna switching means 6 and 7 have a total of three switching contacts, one internal antenna input terminal and two external antenna input terminals, respectively. However, the present invention is not limited to this, and a method using two antenna input terminals can be considered.
[0073]
For example, the internal antenna connected to the internal antenna input terminal is disconnected to enable connection of the external antenna, or the first and second external antennas are connected to the first and second antennas without using the distributor 3, respectively. It can be connected to the external antenna input terminals of the switching means 6 and 7, so that two external antennas can be connected.
[0074]
Next, as a seventh embodiment of the present invention, a process for operating in the diversity reception mode when the connection of the external antenna is not detected will be described with reference to FIG.
[0075]
When the connection to the external antenna terminal is not detected by the external antenna detecting means 2 after the power of the receiver is turned on, the reception signals from the first and second internal antennas 4 and 5 are transmitted to the first and second antennas. The signals are selected by the switching means 6 and 7 and input to the first and second tuners 8 and 9, respectively, which are respectively subjected to A / D conversion, quadrature detection, FFT, and equalization in the first and second processing systems. Processing is performed.
[0076]
After that, the selection unit 21 operates the diversity control unit 22, and the diversity control unit 22 selects or combines the outputs of the first and second equalization processing units 16 and 17, and combines the outputs with the first decoding unit 18. , Or to the second decoding unit 19.
[0077]
Here, when there is no input from the external antenna, that is, in reception using only the internal antenna, it is expected that the reception state is deteriorated as compared with reception using the external antenna. Thus, by performing diversity reception in this way, the reception state can be improved.
[0078]
Next, as an eighth embodiment of the present invention, a description will be given of a process of switching to the double tuner reception mode when the diversity reception is performed by a plurality of internal antennas and the reception state is good, with reference to FIG.
[0079]
In this case, since there is no input from the external antenna 1, even when diversity reception is performed by the above-described method, the reception state determination unit 28 periodically detects and determines the reception state.
[0080]
When the reception state determination unit 28 determines that the reception state is good, the selection unit 21 selects the double tuner reception mode, stops the operation of the diversity control unit 22, and sets the first equalization processing unit 16. Is input to the first decoding unit 18, and the output of the second equalization processing unit 17 is input to the second decoding unit 19.
[0081]
Even if the signal is received by the internal antenna, if the reception condition is good, the operation is performed in this manner, so that the two-screen display or the SI or the like for the EPG display using the demodulation unit not used for viewing is performed. Information acquisition and the like can be performed.
[0082]
Next, a description will be given of an operation of the ninth embodiment of the present invention when the reception state of one antenna is deteriorated.
[0083]
The reception state determination unit 28 periodically detects and determines the respective reception states from the outputs of the first and second decoding units 18 and 19. When the reception state determination unit 28 determines that one of the reception states is deteriorated, the selection unit 21 operates the diversity control unit 22, and the diversity control unit 22 operates the first and second equalization processing units. The outputs of 16 and 17 are selected or combined and input to the first decoding unit 18 or the second decoding unit 19.
[0084]
In this way, when one of the received signals is degraded, a good reception state can be maintained by switching from the double tuner reception mode to the diversity reception mode.
[0085]
Here, as a cause of the deterioration of the received signal and the difficulty of the reception, a decrease in the received signal power can be considered. At this time, if the diversity reception mode that combines the two systems of received signals is used, the received signal power increases. (1) It is possible to improve reception characteristics as compared with the case where demodulation is performed using a single-system received signal.
[0086]
Next, as a tenth embodiment of the present invention, the operation of acquiring information such as SI for displaying an EPG when the operation is started in the double tuner reception mode in a good reception state is shown in FIG. 2 will be described.
[0087]
First, the operation when the receiver starts operation in the double tuner reception mode will be described. In this case, there are the following three cases.
[0088]
The first case is that the receiving state determining unit 28 determines that the receiving state is good after the power of the receiver is turned on.
[0089]
The second is a case where the reception state has deteriorated and the operation has been performed in the diversity reception mode. Here, the reception state determination unit 28 determines that the reception state has been improved.
[0090]
Third, the external antenna detecting means 2 detects a connection to an external antenna terminal.
[0091]
In such a case, the receiver starts the operation in the double tuner reception mode by the selection of the selection unit 21, and at the same time, acquires information such as SI for EPG display using a tuner and a demodulation unit not used for viewing. Therefore, the frequency of a receivable channel is set from the control means 20 to a tuner not used for viewing, and information is acquired.
[0092]
As described above, by acquiring the SI immediately after starting the operation in the double tuner reception mode, the time for displaying the EPG can be reduced.
[0093]
Next, as an eleventh embodiment of the present invention, an operation of selecting a reception mode in accordance with a function of a receiver, such as two-screen display and acquisition of information related to broadcasting, will be described with reference to FIG.
[0094]
While the receiver is operating in the diversity reception mode, when the input means (not shown) is operated by the user and thereby switched to the two-screen display mode function, or switched to the process of acquiring information related to broadcasting, In the embodiment, the mode is automatically switched to the double tuner reception mode.
[0095]
Here, the case of acquiring information related to broadcasting refers to, for example, acquiring information for displaying an EPG using the other tuner and the demodulation unit while viewing with one tuner and the demodulation unit, or A case is considered in which a search for detecting a receivable channel is performed using the other tuner and the demodulation unit while viewing with the tuner and the demodulation unit.
[0096]
These operations may be performed by the above-mentioned operation of the user, or may be performed automatically by a timer function or the like of the receiver. The embodiment of the present invention can cope with any case. It is.
[0097]
In FIG. 2, during operation as diversity reception, when the mode is switched to the two-screen display mode or when information relating to broadcasting is acquired as described above, the selection unit 21 switches the mode to the double tuner reception mode. , The operation of the diversity control unit 22 is stopped, the output of the first equalization processing unit 16 is input to the first decoding unit 18, and the output of the second equalization processing unit 17 is output to the second decoding unit 19. Input.
[0098]
When performing a two-screen display, or when acquiring information for displaying an EPG during viewing or performing a channel search, it is necessary to operate in the double tuner reception mode. Automatically switches from the diversity reception state to the double tuner reception state.
[0099]
Next, as a twelfth embodiment of the present invention, an operation of switching between the diversity reception mode and the double tuner reception mode by manual operation (manual operation) will be described with reference to FIG.
[0100]
When the user manually switches the reception mode using a remote controller or a button provided on the receiver, the control signal is input to the control means 20, and the control signal is input from the control means 20 to the selection means 21 at this time. An instruction to select a reception mode is given in accordance with the received control signal.
[0101]
Therefore, the selection unit 21 supplies an instruction to switch from the diversity reception mode to the double tuner reception mode or an instruction to switch from the double tuner reception mode to the diversity reception mode to the diversity control unit 22.
[0102]
As a result, the diversity control unit 22 causes the outputs of the first and second equalization processing units 16 and 17 to be input to the respective decoding units 18 and 19 according to the received instruction.
[0103]
By controlling in this way, the user can freely switch between diversity reception and double tuner reception, and when importance is placed on the reception quality, set to the diversity reception mode, acquire information for EPG display while watching, When it is desired to perform a channel search or the like for detecting a receivable channel, an operation according to the user's needs such as a double tuner reception mode can be performed.
[0104]
Next, as a thirteenth embodiment of the present invention, an operation for informing whether the receiver is currently operating in the double tuner reception mode or the diversity reception mode will be described.
[0105]
In FIG. 4, the output data corrected by the first and second decoding units 18 and 19 are separated by the DEMUX CPU 24 into video data and audio data. At this time, the control unit 20 supplies the OSD display unit 25 with information indicating which of the double tuner reception mode and the diversity reception mode is operating.
[0106]
Therefore, the OSD display unit 25 superimposes image information indicating whether the operation is performed in the double tuner reception mode or the diversity reception mode on the video data separated by the DEMUX CPU 24 and inputs the video information to the video decoder 26.
[0107]
FIG. 5 shows an example of the image surface on the screen display surface at this time. Here, FIG. 5 is a display example when the mode is switched from the double tuner reception mode to the diversity reception mode. In this case, first, as shown in the upper right of the figure, a character such as “switched to diversity reception” is displayed. There is a display method.
[0108]
Also, as shown in the lower right of the figure, one antenna symbol figure representing the double tuner reception mode and two antenna symbol figures representing the diversity reception mode are prepared, and by switching these figures, There is also a method of displaying that the mode has been switched from the double tuner reception mode to the diversity reception mode.
[0109]
Therefore, according to this embodiment, the user can always recognize whether the receiver is currently operating in the double tuner reception mode or the diversity reception mode.
[0110]
Here, in the embodiment of FIG. 5 described above, the notification of whether the receiver is operating in the double tuner reception mode or the diversity reception mode is given by the display inside the screen. However, the present embodiment is not limited to this, and a light emitting element may be provided outside the screen as shown in FIG.
[0111]
In FIG. 6, FIG. 6A shows an embodiment in which one light emitting element is used and its emission color is changed according to the double tuner reception mode and the diversity reception mode. b) is an embodiment in which two light emitting elements are used, and different light emitting elements emit light according to the double tuner reception mode and the diversity reception mode.
[0112]
FIG. 7 shows an example of the configuration of this embodiment. In this case, the control unit 20 sends information indicating which of the double tuner reception mode and the diversity reception mode is being operated to the light emitting unit 29, and the light emitting unit 29 Then, it is determined whether the mode is the double tuner reception mode or the diversity reception mode.
[0113]
When the display method of FIG. 6A is adopted, the emission color of one light emitting element is changed to, for example, green and red according to the mode. When the display method of FIG. 6B is adopted, One and the other of the two light-emitting elements emit light separately according to the mode.
[0114]
On the other hand, as a method of notifying the user of the reception mode, a means by voice may be employed as in the embodiment shown in FIG. 8, and in the embodiment of FIG. 8, the mode is switched from the double tuner reception mode to the diversity reception mode. In this case, an example in which the user is notified with a voice message “switched to diversity reception”.
[0115]
FIG. 9 shows an embodiment in which the movement of an internal antenna built in a receiver is used as another notification means. In the embodiment shown in FIG. 9, means for moving the internal antennas 4 and 5 incorporated in the receiver is provided.
[0116]
Then, in the case of the double tuner reception mode, the internal antennas 4 and 5 remain housed in the receiver, and in the case of the diversity reception type, the internal antennas 4 and 5 are drawn out of the receiver. Thus, notification of the reception mode can be obtained.
[0117]
At this time, in FIG. 9A, the internal antennas 4 and 5 are pulled out to the side of the receiver, and in FIG. 9B, they are pulled out to the upper part. There is no change in the point notified by the movement of 4 and 5.
[0118]
Therefore, according to this embodiment, in addition to the notification, in the diversity reception mode, the internal antennas 4 and 5 are taken out and the sensitivity is improved, so that the reception characteristics can be improved.
[0119]
Here, as described above, in the embodiment provided with the means for notifying the user of the reception mode, that is, in the case of the embodiment including the notification means, the reception mode may be always notified while the receiver is operating, or the reception mode may be set. May be notified only when is switched. The notification may be made in response to an instruction from the user. In this case, the user can always know the reception mode as needed.
[0120]
On the other hand, when such a reception mode is notified to the user, the notification may be prevented from being performed as necessary. That is, in this case, the embodiment is performed in a state where a function of turning on and off the notification unit is provided.
[0121]
In this case, the user manually turns on / off the notification means to the control means 20 in any of the embodiments shown in FIGS. 1 to 4 by using input means such as buttons provided on the remote control or the receiver. Is supplied so that a control signal is supplied.
[0122]
Then, when this control signal is supplied, the control means 20 performs ON / OFF control of a means for notifying the user of the reception mode, and a notification is given when the control signal is ON and is not provided when the control signal is OFF. To do so.
[0123]
Means for notifying the user of the reception mode at this time include, for example, the display of a graphic in the embodiment of FIG. 5, the light-emitting display of the light-emitting element in the embodiment of FIG. 6, the voice display in the embodiment of FIG. Are given by display by moving the internal antennas 4 and 5 in the embodiment of FIG.
[0124]
Therefore, according to the embodiment in which the function of turning on and off the notification unit is provided, the user can turn on and off the notification function of the reception mode at any time as needed.
[0125]
【The invention's effect】
According to the present invention, the reception mode is automatically switched according to the reception state and the operation of the receiver, so that stable reception characteristics can be ensured corresponding to both the double tuner reception mode and the diversity reception mode, And a digital receiver capable of effectively utilizing the tuner and the demodulation unit.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a digital receiving apparatus according to a first embodiment of the present invention in a block configuration.
FIG. 2 is an explanatory diagram showing a second embodiment of the digital receiving apparatus according to the present invention in a block configuration.
FIG. 3 is an explanatory diagram showing a block diagram of a third embodiment of the digital receiving apparatus according to the present invention.
FIG. 4 is an explanatory diagram showing a block configuration of a fourth embodiment of the digital receiving apparatus according to the present invention.
FIG. 5 is an explanatory diagram showing an example of means for notifying a user of a reception mode in one embodiment of the present invention.
FIG. 6 is an explanatory diagram showing another example of means for notifying a user of a reception mode in one embodiment of the present invention.
FIG. 7 is an explanatory diagram showing a fifth embodiment of the digital receiving apparatus according to the present invention in a block configuration.
FIG. 8 is an explanatory diagram showing still another example of a means for notifying a user of a reception mode in one embodiment of the present invention.
FIG. 9 is an explanatory diagram showing still another example of means for notifying a user of a reception mode in one embodiment of the present invention.
FIG. 10 is a block diagram illustrating an example of a digital receiving device according to the related art.
[Explanation of symbols]
1 external antenna
2 External antenna detection means
3 distributor
4, 5 Internal antenna
6, 7 antenna switching means
8, 9 tuner
10, 11 A / D converter
12, 13 quadrature detector
14, 15 FFT section
16, 17 Equalization processing unit
18, 19 decoding unit
20 control means
21 Selection means
22 Diversity control means
23 Demodulation unit
24 DEMUX CPU
25 OSD display
26 Video decoder
27 Audio Decoder
28 Reception state determination means
29 Light emitting unit

Claims (17)

In the digital receiving device of a system having a plurality of tuners and operating by switching the receiving mode between the double tuner receiving mode and the diversity receiving mode,
Providing reception mode control means,
A digital receiving apparatus, wherein switching between the double tuner reception mode and the diversity reception mode is automatically performed by the reception mode control means. The digital receiving device according to claim 1,
Providing a reception state determination unit that determines a reception state based on a state of a signal received by the tuner,
The digital receiving apparatus according to claim 1, wherein said reception mode control means is controlled in accordance with a result of determination by said reception state determination means. The digital receiving device according to claim 2,
The reception state determination means is configured to give a determination result according to at least any one of an error rate of a received signal, a reception strength, a signal level, an AGC control level, a noise level, and the presence or absence of an error after error correction processing. A digital receiver characterized by the above-mentioned. The digital receiving device according to any one of claims 1 to 3,
Means for switching between an external antenna terminal and an internal antenna terminal,
An external antenna detecting means for detecting an input from the external antenna terminal,
The reception apparatus, wherein the reception mode control means switches to a double tuner reception mode when a signal input from the external antenna terminal is detected by the external antenna detection means. The digital receiving device according to claim 4,
The digital receiving apparatus, wherein the reception mode control means switches to a diversity reception mode when the reception state determination means determines that the reception state has deteriorated. The digital receiving device according to any one of claims 1 to 5,
A digital receiving device, comprising: means for connecting a plurality of external antennas. The digital receiving device according to claim 4,
The digital reception device, wherein the reception mode control means switches to a diversity reception mode when connection of an external antenna is not detected by the external antenna detection means. The digital receiving device according to claim 7,
The digital receiving apparatus, wherein the reception mode control means switches to a double tuner reception mode when the reception state determination means determines that the reception state is good. The digital receiving device according to any one of claims 1 to 8,
A digital receiving apparatus, wherein when the mode is switched to a double tuner receiving mode, acquisition of information on broadcast is started using a tuner not used for viewing. The digital receiving device according to any one of claims 1 to 9,
The digital receiving apparatus according to claim 1, wherein said receiving mode control means selects one of said diversity receiving mode and double tuner receiving mode according to a function of a receiver. The digital receiving device according to any one of claims 1 to 10,
The digital receiving apparatus according to claim 1, wherein the receiving mode control means selects one of the diversity receiving mode and the double tuner receiving mode according to a manual operation. The digital receiving device according to any one of claims 1 to 11,
A digital receiving device, comprising: means for notifying a user of which of the double tuner reception mode and the diversity reception mode the user is watching in. The digital receiving device according to claim 12,
The digital receiving apparatus according to claim 1, wherein the notifying unit is configured to display at least one of a character and a graphic in a screen. The digital receiving device according to claim 12,
A digital receiving device, wherein the notifying means is constituted by a light emitting element provided outside a screen. The digital receiving device according to claim 12,
A digital receiving apparatus, wherein the notifying means is constituted by a notifying means by voice. The digital receiving device according to claim 12,
The digital receiving device, wherein the notifying unit is configured by a unit that moves an internal antenna. The digital receiving device according to claim 12,
A digital receiving apparatus comprising means for manually turning on / off the operation of the notifying means.

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