JP2006313972A - Receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a user to view a broadcast program of each broadcast kind that the user desires with high quality by switching the channel to another channel over which a broadcast program of the same kind is broadcast, when the reception state of the channel which is currently received becomes worse. <P>SOLUTION: A receiver 10 selectively receives broadcast waves, including digital broadcast signals transmitted over mutually different channels. Each of the digital broadcast signal includes broadcast program kind information, indicating the kind of a broadcast program. The receiver 10 receives a broadcast wave of a channel different from a broadcast wave being received at present as a monitor broadcast wave, monitors broadcast program kind information in the monitor broadcast wave to detect whether user-input broadcast program kind information matches the broadcast program kind information, and outputs a kind matching signal and also detects the reception quantity of the broadcast wave from the monitor broadcast wave, when they match each other. When the reception quality is determined as being proper, reception control is carried out to receive the monitor broadcast wave as a received broadcast wave, once the kind-matching signal is received and then output a broadcast program related to the received broadcast wave. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a receiving apparatus that receives a broadcast wave to which a broadcast program type is added, and more particularly to a radio receiving apparatus that selectively demodulates and outputs an analog signal and a digital signal.

  In general, an in-vehicle radio receiving device (hereinafter referred to as a car radio receiving device), which is one of radio receiving devices, may move out of the service area of a broadcasting station as the vehicle moves. It is necessary to re-tune by operating the car radio receiver. In order to facilitate re-tuning, for example, RDS (Radio Data System) exists in Europe. In RDS, digital data (hereinafter referred to as RDS data) is multiplexed and transmitted in FM radio broadcasting.

  The RDS data includes, for example, a broadcast program identification code composed of a country code and a broadcast station code, a genre identification code for identifying a broadcast program genre (broadcast program type) (broadcast type signal: in this genre identification code, for example, Includes individual codes for multiple genres such as music, talk, sports, news, etc.), alternative station frequency code to inform other broadcast stations that broadcast the same broadcast program, and broadcast station name code ing.

  Then, the car radio receiving apparatus sequentially receives broadcast stations that transmit the same content broadcast program in a good reception state using the RDS data. For example, when automatically selecting a broadcast station that broadcasts the same broadcast program, the signal related to the alternative broadcast station that broadcasts the same broadcast program obtained from the signal strength and the alternative station frequency code of the currently receiving broadcast station The strength is compared, and the channel is automatically selected according to the comparison result and the broadcast program type code. The automatic channel selection function also has a function of selecting a genre identification code desired by the user and selecting a broadcast station that transmits an FM radio broadcast including the selected genre identification code.

  By the way, in RDS, when FM radio broadcast (that is, analog radio broadcast) is received, only re-selection is performed according to RDS data, and an analog signal and a digital signal are simultaneously transmitted at the same center frequency. In the transmission system (broadcast form), it is not possible to selectively receive an analog signal and a digital signal.

  For example, a broadcasting system called an IBOC (In Band On Channel) system proposed by iBuquity in the United States is known as a broadcasting system for simultaneously broadcasting analog broadcasting and digital broadcasting from the same broadcasting station. In the system, the digital broadcast is broadcast on a channel between analog broadcasts, and the digital broadcast in the IBOC system uses a multi-carrier transmission system. At this time, in order to avoid affecting the adjacent analog broadcast, Broadcasting is transmitted with lower transmission power than analog broadcasting.

  When receiving a radio broadcast in the form of a broadcast such as an IBOC system, a high-quality digital broadcast is usually received. When the digital broadcast becomes unreceivable, the digital broadcast is switched to an analog broadcast and the digital broadcast is received again. When it becomes possible, it is necessary to switch to digital broadcasting, and further, switching between analog broadcasting and digital broadcasting is performed according to the broadcasting type (genre). For example, when viewing music, it is preferable to select digital broadcasting in order to view with high quality.

  On the other hand, in a digital broadcast receiver, when receiving and viewing audio data to which viewing conditions are added, there is one that determines whether or not audio data is subjected to degradation processing according to viewing conditions (for example, Patent Document 1). Further, when receiving satellite broadcast (digital broadcast), the sound mode (A mode or B mode) of the sound signal is determined, and the volume of sound reproduced from the sound signal is determined according to the determined sound mode. Some have been changed (see, for example, Patent Document 2).

  In addition, when different types of audio multiplex system broadcast signals are mixed, when switching these audio multiplex system decode signals, there is one that performs this switching in accordance with the determination of the audio multiplex system (for example, patents). Reference 3).

JP-A-2002-237788 (pages 3 to 5, FIGS. 1 and 6) JP-A-4-351123 (pages 3 to 4, FIGS. 1 to 3) Japanese Laid-Open Patent Publication No. 2-166687 (pages 2 to 5, FIGS. 1 and 2)

  Since the conventional receiving apparatus is configured as described above, that is, in Patent Document 1, since it is only determined whether or not the audio data is subjected to degradation processing according to the viewing conditions, it is currently being received. When the reception state of the broadcast wave (channel) of the channel deteriorates, it is impossible to switch to another channel that broadcasts the same broadcast program type, and it is impossible to view a broadcast program of the user's desired broadcast program type There was a problem.

  Further, in Patent Document 2, since the sound volume is simply changed according to the sound mode, similarly, when the reception state of the channel currently being received deteriorates, the same broadcast program type is broadcast. There was a problem that switching to another channel could not be performed and a broadcast program of a broadcast program type desired by the user could not be viewed.

  Further, in Patent Document 3, when switching decoded signals of different audio multiplex systems, only the switching is performed according to the determination of the audio multiplex system, and the reception state of the channel currently being received deteriorates. In this case, there is a problem that it is not possible to switch to another channel that broadcasts the same broadcast program type, and it is impossible to view a broadcast program of a user-desired broadcast program type.

  The present invention has been made to solve the above-described problems. When the reception state of a channel currently being received deteriorates, the channel is switched to another channel that broadcasts the same broadcast program type, and the user desires. It is an object of the present invention to provide a receiving apparatus that can watch a broadcast program of a broadcast type with high quality, and can selectively receive analog broadcast and digital broadcast and view them with user-desired quality.

  The receiving apparatus according to the present invention selectively receives broadcast waves including digital broadcast signals transmitted through different channels. Each of the digital broadcast signals includes broadcast program type information indicating the type of broadcast program. This receiving apparatus uses a broadcast wave of a channel different from the currently received broadcast wave as a monitor broadcast wave, and broadcast program in the monitor broadcast wave. A broadcast program type determination means for monitoring whether the type information is monitored and the input broadcast program type information input by the user matches the broadcast program type information, and outputs a type match signal when the information matches. Receiving quality detection means for detecting the reception quality of the wave, and receiving a type match signal when the reception quality detection means determines that the reception quality is good, the monitor broadcast wave is received as the received broadcast wave and the received broadcast wave And a reception control means for performing reception control for outputting the broadcast program.

  As described above, according to the present invention, the broadcast wave of a channel different from the currently received broadcast wave is set as the monitor broadcast wave, the broadcast program type information is monitored in the monitor broadcast wave, and the input broadcast program type information and the broadcast program type information are monitored. Is detected, and if it matches, a type match signal is output. When it is determined that the reception quality of the broadcast wave is good in the monitoring broadcast wave, the monitoring broadcast wave is received when the type match signal is received. Since it is configured to receive a broadcast wave and output a broadcast program related to the received broadcast wave, when the reception state of the currently receiving channel deteriorates, switching to another channel that broadcasts the same broadcast program type is performed. There is an effect that a broadcast program of a broadcast type desired by the user can be viewed with high quality.

Embodiment 1 FIG.
First, referring to FIG. 1, here, an IBOC system will be described as an example of a system for simultaneously broadcasting analog broadcasting and digital broadcasting. FIG. 1 is a diagram showing a power spectrum distribution during transmission in the IBOC system. In FIG. 1, the horizontal axis represents frequency, and the vertical axis represents power spectrum intensity (level) in broadcast waves. In FIG. 1, the horizontal axis indicates a deviation from the center frequency when the center frequency of analog broadcasting (for example, FM audio broadcasting) is 0. The digital broadcast wave (digital broadcast signal) is transmitted using the analog broadcast wave (analog broadcast signal), and the center frequency of the digital broadcast wave is the same as the center frequency of the analog broadcast wave. The power spectrum is distributed outside the power spectrum of analog broadcast waves.

  When analog broadcasting and digital broadcasting are performed simultaneously (hereinafter, this broadcast wave is referred to as a composite broadcast wave), the broadcast station transmits the composite broadcast wave using the same antenna, and the receiver uses the same antenna. The composite broadcast wave is received, and therefore, the power spectrum intensity of the digital broadcast wave and the analog broadcast wave is broadcast at a predetermined ratio, and has the same ratio at the time of reception. In the IBOC system, even if an analog broadcast wave and a digital broadcast wave are simultaneously broadcast at the same center frequency, mutual interference is prevented by preventing the power spectra from overlapping each other.

  Referring to FIG. 2, FIG. 2 is a block diagram showing an example of a receiving apparatus according to Embodiment 1 of the present invention. In the following description, analog broadcast waves are FM broadcasts or AM broadcasts, and digital broadcasts are DAB audio. A case of broadcasting will be described as an example. In the DAB system, OFDM (Orthogonal Frequency Division Multiplex) is used as the modulation method.

  The receiving apparatus 10 includes first and second tuners 11 and 12, and first and second antennas 13 and 14 are connected to the first and second tuners 11 and 12, respectively. Thus, a receiver having two tuners is called a twin tuner receiver). The first and second tuners 11 and 12 are connected to an analog / audio signal processing unit 15, and a speaker 16 is connected to the analog / audio signal processing unit 15. Further, a microcomputer 17 and a digital signal processing unit 18 are connected to the analog / audio signal processing unit 15.

  The receiving apparatus 10 shown in the figure receives the composite broadcast wave using the first and second tuners 11 and 12 (the digital broadcast wave includes at least a broadcast type signal, and other broadcast program identification code, alternative station frequency code) And the broadcast station name code may be included). As will be described later, one of the first and second tuners 11 and 12 is used for viewing and the other is used for monitoring. The composite broadcast wave received by the first and second tuners 11 and 12 is converted into an intermediate frequency signal (IF signal) and supplied to the analog / audio signal processing unit 15.

  The analog audio signal processing section 15 has two demodulation paths, and these demodulation paths have analog-digital conversion sections (A / D) 21 and 22 and FM / AM demodulation sections 23 and 24, respectively. (Hereinafter, the IF signal applied to the A / D 21 is referred to as a first IF signal, and the IF signal applied to the A / D 22 is referred to as a second IF signal). Further, the analog / audio signal processing unit includes a circuit switching unit 25, an analog / digital switching unit 26, an audio unit 27, and a digital-analog conversion unit (D / A) 28, and the D / A 28 is connected to the speaker 16. ing.

  The first IF signal is A / D converted by the A / D 21, and then the component related to the analog broadcast wave is demodulated by the FM / AM demodulating unit 23 and given to the circuit switching unit 25 as the first demodulated signal. Similarly, after the second IF signal is A / D converted by the A / D 22, the component related to the analog broadcast wave is demodulated by the FM / AM demodulating unit 24, and the circuit switching unit 25 is used as the second demodulated signal. Given to. Then, the circuit switching unit 25 selects one of the first and second demodulated signals as a demodulated output signal as will be described later.

  As shown in the figure, the digital signal processing unit 18 includes IQ demodulating units 31 and 32, FFT units 33 and 34, a circuit switching unit 35, an OFDM demodulating unit 36, a deinterleave error correcting unit 37, and an audio demodulating unit 38. The IQ demodulation units 31 and 32 are connected to the output sides of the A / Ds 21 and 22, respectively.

  The IQ demodulator 31 generates an I signal and a Q signal by the quantized signal supplied from the A / D 22, and the I signal and the Q signal are fast Fourier transformed by the FFT unit 33. Similarly, the IQ demodulator 32 generates an I signal and a Q signal by the quantized signal supplied from the A / D 21, and these I signal and Q signal are fast Fourier transformed by the FFT unit 34.

  The circuit switching unit 35 selects one of the FFT units 33 and 34, and the output of the circuit switching unit 35 is given to the OFDM demodulation unit 36, where it is OFDM demodulated, and further demultiplexed by the deinterleave error correction unit 37. Interleaving and detection / correction of error codes are performed. The output of the deinterleave error correction unit 37 (error corrected output) is decoded by the audio demodulation unit 38 and output as a decoded signal, which is given to the microcomputer 17.

  The microcomputer 17 includes first and second comparison reference value memories 41 and 42, a digital quality detection unit 43, an analog quality detection unit 44, an OR gate 45, an AND gate 46, and a broadcast type determination unit 47. , A broadcast type reception memory 48, a broadcast type setting memory 49, a control unit 50, a frequency conversion unit 51, a tuner control unit 52, and a circuit switching unit 53, and are set in the comparison reference value memories 41 and 42 in advance. The reference values (threshold values) are stored as digital reference values (first reference values) and analog reference values (second reference values), respectively.

  The above-mentioned decoded signal is given to the digital quality detection unit 43, and the digital quality detection unit 43 detects the quality of the decoded signal according to the digital reference value and outputs the first detection signal. On the other hand, the analog quality detection unit 44 is provided with a demodulated output signal, and the analog quality detection unit 44 determines the quality of the demodulated output signal in accordance with the analog reference value and outputs a second detection signal. These first and second detection signals are logically ORed by the OR gate 45 and supplied to the AND gate 46 as a logical sum signal.

  When the user inputs a desired broadcast program type (genre) through the input means 61, this broadcast program type is given to the broadcast type determination means 47. Note that the broadcast program type may be set in the broadcast type setting memory 49 by the input means 61 in advance. That is, the broadcast program type is directly given from the input unit 61 to the broadcast type determination unit 47, or the set broadcast type set in the broadcast type setting memory 49 is given to the broadcast type determination unit 47.

  The broadcast type determination unit 47 is supplied with a decoded signal from the audio demodulator 38, and the broadcast type determination unit 47 determines whether the set broadcast type and the broadcast type included in the decoded signal match. Is output. This type match signal is given to the AND gate 46 and the broadcast type reception memory 48. The display means 62 displays whether or not the broadcast type of the digital broadcast being received matches the broadcast type set by the user according to the type match signal stored in the broadcast type reception memory 48.

  The AND gate 46 performs a logical product operation of the logical sum signal and the type match signal, and gives the logical product signal to the frequency conversion means 51 and the circuit switching unit 53 as an output. The circuit switching unit 53 selectively connects the frequency conversion means 51 and the tuner control means 52 to the first and second tuners 11 and 12 in accordance with the logical product signal, as will be described later. Outputs a reception frequency corresponding to the logical product signal.

  As will be described later, when the frequency converter 51 is connected to the first tuner 11, the tuner controller 52 is connected to the second tuner 12, and the frequency converter 51 is connected to the second tuner 12. When connected, the tuner control means 52 is connected to the first tuner 11, and the first or second tuner 11 or 12 is controlled by the tuner control means 52.

  Further, the circuit switching unit 25 selects one of the first and second demodulated signals as a demodulated output signal in accordance with the logical product signal, and supplies it to the analog / digital switching unit 26. On the other hand, the switching control unit 63 controls the analog / digital switching unit 26 based on the logical product signal, and the analog / digital switching unit 26 selects one of the demodulated output signal and the decoded signal as a selected output signal. This is given to the audio unit 27. The control unit 50 controls the audio unit 27 in accordance with the logical product signal, and the selection output signal amplified by the audio unit 27 is D / A converted by a digital-analog conversion unit (D / A) 28 to be used as a speaker. 16 is output.

Next, the operation will be described.
Referring to FIGS. 2 and 3, in FIG. 2, it is assumed that the first tuner 11 is for viewing and the second tuner 12 is for monitoring. At this time, the tuner switching means 52 is connected to the second tuner 12 by the circuit switching unit 53, and the frequency converting means 51 is connected to the first tuner 11. As described above, sound corresponding to the broadcast wave received by the first tuner 11 is output from the speaker 16.

  In this state, the channel is switched by searching whether there is a channel broadcasting the same broadcast type as the reception channel in a channel other than the broadcast wave (that is, the reception channel) received by the first tuner 11. (This channel switching is performed, for example, when the user determines that the quality of the sound output from the reception channel has deteriorated), as indicated by a dashed line in FIG. The other channel type search command is given to the tuner control means 52, and the other channel type search is started (step ST1).

  The tuner control unit 52 controls the second tuner 12 to receive another channel, and the broadcast type determination unit 47 determines whether or not the broadcast types match as described above. That is, it is determined whether there is a corresponding type (step ST2). If there is no corresponding type, the system once enters a waiting state (wait) (step ST3), and then returns to step ST1 to search for another channel again.

  On the other hand, if there is a corresponding type in step ST2 and the logical sum signal from the OR gate 45 is at a high level, the frequency switching means 51 is connected to the second tuner 12 by the circuit switching section 53, and the tuner control means 52 is Connected to the first tuner, the frequency conversion means 51 gives the frequency of the other channel of the corresponding type to the second tuner 12 to perform channel switching (step ST4). That is, the first tuner 11 is for monitoring, and the second tuner 12 is for viewing.

  Next, referring to FIGS. 2 and 4, it is assumed that the first tuner 11 is for viewing and the second tuner 12 is for monitoring. A case of switching to such sound will be described. When there is a broadcast type designation designated by the user in the broadcast type memory 49 (step ST5), that is, when another channel type search command is given from the input means 61 to the tuner control means 52, as shown by a chain line in FIG. Receivable station search is started (step ST6), and the tuner control means 52 controls the second tuner 12 to receive another channel. If the digital broadcast can be received (step ST7), the broadcast type determination means 47 determines whether the broadcast type is designated by the user (step ST8).

  When the broadcast types match, the frequency conversion means 51 is connected to the second tuner 12 by the circuit switching unit 53, the tuner control means 52 is connected to the first tuner, and the frequency conversion means 51 determines other types of the corresponding type. The frequency of the channel is given to the second tuner 12, and the frequency is switched (step ST9). That is, the first tuner 11 is for monitoring, and the second tuner 12 is for viewing.

  On the other hand, if there is no receivable digital broadcast in step ST7, the process proceeds to step ST10. Similarly, if the broadcast types do not match, the process proceeds to step ST10. In step ST10, it is checked whether or not the search has been completed for all frequencies. If not, the process returns to step ST6 and the search is continued.

  By the way, it is preferable that the reference value for switching from analog broadcasting to digital broadcasting is different from the reference value for switching from digital broadcasting to analog broadcasting. For example, as shown in FIG. 5, when the broadcast type: music, talk, sports, and news is changed from a reference value when switching from the analog broadcast to the digital broadcast and a reference value when switching from the digital broadcast to the analog broadcast, Switching from analog broadcasting to digital broadcasting is performed when the quality of digital broadcasting reaches the reference value “9” or more during reception of a music program by analog broadcasting.

  On the other hand, when the quality of the digital broadcast becomes less than the reference value “5” while viewing the music program by the digital broadcast, the digital broadcast is switched to the analog broadcast. Since the music program is preferably of high quality, the reference value is lowered in the order of the music program, the talk program, the sports program, and the news program as shown in the figure.

  In this way, if the reference value for switching from analog broadcasting to digital broadcasting is different from the reference value for switching from digital broadcasting to analog broadcasting, there will be some variation in reception quality between analog broadcasting and digital broadcasting. Reception switching is not performed, and reception can be continued stably.

  When it is necessary to give priority to reception by digital broadcasting such as a music program, the relationship between analog quality and digital quality may be defined as shown in FIG. 6, for example. In the illustrated example, the hatched portion is the threshold range, and the threshold range is wide for music programs that prioritize digital broadcasting, and when the digital broadcasting is not prioritized, such as news programs or sports programs, the threshold range is Narrowed.

  In the example shown in FIG. 2, the example in which both the first and second tuners 11 and 12 are used for reception and monitoring has been described. However, one of the first and second tuners 11 and 12 is always used for reception. The other of the first and second tuners 11 and 12 may always be used for monitoring. Referring to FIG. 7, the same components as those in FIG. 2 are denoted by the same reference numerals in FIG. In FIG. 7, the first tuner 11 is used for reception and the second tuner 12 is used for monitoring.

  Therefore, the illustrated receiving apparatus 10 does not require the circuit switching units 25, 35, and 51 shown in FIG. 2, and only the output of the FM / AM demodulating unit 23 is supplied to the analog / digital switching unit 26, so that the FM / AM demodulation is performed. The output of the unit 24 is given to the analog quality detection unit 44. Further, the output of the frequency conversion means 51 is connected to the first tuner 11, and the tuner control means 52 is connected to the second tuner 12.

  Further, it further comprises an OFDM demodulator 71, a deinterleave error correction unit 72, and an audio demodulator 73. The output of the FFT unit 33 is given to the OFDM demodulator 71, and the output of the audio demodulator 73 is converted into a digital quality detector. 43. Then, the output of the FFT unit 34 is directly given to the OFDM demodulation unit 36.

  In this way, the second tuner 12 is controlled by the tuner control means 52, the reception frequency of the first tuner 11 is changed by the frequency conversion means 51, and the first tuner 11 always uses the same broadcast type. Broadcast programs can be received in good condition.

  By the way, in the receiving apparatus 10 shown in FIGS. 2 and 7, the receiving apparatus having the two tuners 11 and 12 has been described. However, only one tuner may be provided. For example, in FIG. 7, only the first tuner 11 may be provided (such a receiving apparatus is referred to as a single tuner receiving apparatus). In this case, the antenna 14 is not required, and the IQ demodulator 31, FFT unit 33, OFDM demodulator 71, deinterleave error correction unit 72, and audio demodulator 73 are not required. The tuner control means 52 is connected to the first tuner 11. Further, the output of the FM / AM demodulator 23 is given to the analog quality detector 44. As shown in FIG. 8, the IQ demodulator 32, the FFT unit 34, the OFDM demodulator 36, the deinterleave error correction unit 37, and the audio demodulator 38 are mounted on one chip 81.

  In such a single tuner receiving apparatus, the channel is switched as shown in FIG. In general, in a broadcast program, the sound may be interrupted, and it is detected whether or not the sound is interrupted (step ST11). When the sound interrupt is detected, the tuner control means 52 controls the first tuner 11. Then, the other channel is received, and it is determined by the broadcast type determination means 47 whether or not the broadcast types match as described above (tuner frequency change: step ST12).

  Then, the frequency is returned to the original channel frequency (step ST13), and it is checked whether or not the broadcast type search has been performed for all the channels. Is set (timer setting: step ST14), and the process is terminated. On the other hand, if the search for the broadcast type is not completed for all channels in step ST14, the process returns to step ST11. When the timer counts up, this flow is executed again.

  In the example shown in FIG. 7, the IQ demodulator 31, the FFT unit 33, the OFDM demodulator 71, the deinterleave error correction unit 72, and the audio demodulator 73 are configured by one chip, and the IQ demodulator 32, The FFT unit 34, the OFDM demodulation unit 36, the deinterleave error correction unit 37, and the audio demodulation unit 38 may be configured by one chip.

  2 also includes an OFDM demodulator 71, a deinterleave error corrector 72, and an audio demodulator 73, an IQ demodulator 31, an FFT unit 33, an OFDM demodulator 71, and a deinterleave error corrector. 72 and the audio demodulator 73 are configured by one chip, and the IQ demodulator 32, FFT unit 34, OFDM demodulator 36, deinterleave error correction unit 37, and audio demodulator 38 are configured by one chip. In this case, the circuit switching unit 35 is disposed after the audio demodulation units 38 and 73, and the output of the circuit switching unit 35 is the analog / digital switching unit 26, the digital quality detection unit 43, and the broadcast type. It is given to the judging means 47.

  As is clear from the above description, the comparison reference value memories 41 and 42, the digital quality detection unit 43, the analog quality detection unit 44, and the OR gate 45 function as reception quality detection means, and an AND gate 46, control means. 50, the frequency conversion means 51, the tuner control means 52, the switching control section 63, and the circuit switching section 53 function collectively as reception control means.

  Further, the FM / AM demodulation units 23 and 24 function as analog demodulation means, and IQ demodulation units 31 and 32, FFT units 33 and 34, a circuit switching unit 35, an OFDM demodulation unit 36, a deinterleave error correction unit 37, and an audio The demodulator 38 collectively functions as a digital demodulator. The circuit switching unit 25 and the analog / digital switching unit 26 function as output switching means.

  By the way, depending on the broadcast type, the audio settings and graphic equalizer settings in the receiving apparatus 10 may be automatically switched, and the subwoofer and external amplifier connected to the outside may be automatically switched. At this time, as described above, the broadcast type signal is monitored, and the audio settings and graphic equalizer settings are automatically changed to settings registered in advance or registered by the user. As a result, it is possible to always view in an optimal audio output state.

  Also, when recording the sound source of the received content, when recording the information such as the genre name, artist name, album name, etc. included in the digital broadcast signal in addition to the broadcast type, and reproducing the recorded sound source again, A desired sound source is searched based on the simultaneously recorded information. Then, the information may be displayed on the display means.

  Furthermore, when the above sound source is played, the audio settings in the sound source playback device, the settings for the graphic equalizer, etc. are connected to the outside according to the information such as the broadcast type, genre name, artist name, album name recorded at the same time. Automatically switch devices such as subwoofers and external amplifiers.

  As described above, according to the first embodiment, either one of the first and second tuners 11 and 12 receives a broadcast wave of a channel different from the currently received broadcast wave as a monitoring broadcast wave, The broadcast program type information is monitored in the monitoring broadcast wave, and the broadcast type determination means 47 detects whether or not the input broadcast program type information input by the user matches the broadcast program type information, and outputs a type match signal if they match. The reception quality of the digital broadcast signal and the analog broadcast signal in the monitoring broadcast wave is detected by the digital quality detection unit 43 and the analog quality detection unit 44, and the reception quality is at least one of the digital quality detection unit 43 and the analog quality detection unit 44. If it is determined that the type match signal is received, the monitoring broadcast wave is received as the received broadcast wave and the broadcast program related to the received broadcast wave is received. Even if the reception status of the currently receiving channel deteriorates, the user can switch to another channel that broadcasts the same broadcast program type and watch the broadcast program of the desired broadcast type with high quality. There is an effect that can be done.

  According to the first embodiment, either one of the digital broadcast signal and the analog broadcast signal is selected according to the detection result in the digital quality detection unit 43 and the analog quality detection unit 44. Therefore, the analog broadcast and the digital broadcast are selected. Can be selectively received and viewed with the user-desired quality.

  According to the first embodiment, since it is determined that the reception quality is good and the type match signal is received, it is notified that the monitoring broadcast wave can be received as the reception broadcast wave, so the user is troublesome. There is an effect that it is possible to know that a broadcast wave of a desired broadcast type can be received without performing an operation.

  According to the first embodiment, the first and second tuners 11 and 12 are provided, and one of the first and second tuners is used as a monitoring tuner for receiving a monitoring broadcast wave, and this monitoring tuner is used. The reception quality is detected according to the analog output and digital output corresponding to, and when the monitoring broadcast wave is received as the reception broadcast wave by the monitoring tuner, the monitoring tuner and another tuner are set as the monitoring tuner. Therefore, there is an effect that a good broadcast wave can be received.

  According to the first embodiment, the tuner has one tuner, and the tuner receives a broadcast wave of a channel different from the currently received broadcast wave while the output related to the currently received broadcast wave is interrupted. Since the examination quality is detected according to the digital output, the configuration is simpler than that of the twin tuner receiver.

It is a figure which shows an example of the broadcast wave received with the receiver by Embodiment 1 of this invention. It is a block diagram which shows an example of a structure of the receiver by Embodiment 1 of this invention. 3 is a flowchart for explaining an operation of searching for a broadcast type of a channel different from the channel currently being received in the receiving apparatus shown in FIG. 3 is a flowchart for explaining a switching operation to a channel different from the channel currently being received in the receiving apparatus shown in FIG. 2. It is a figure which shows an example of the reference value for every broadcast classification used when switching from analog broadcasting to digital broadcasting and switching from digital broadcasting to analog broadcasting. It is a figure which shows an example of the switching threshold value range of digital broadcasting and analog broadcasting for every broadcast classification. It is a block diagram which shows the other example of a structure of the receiver by Embodiment 1 of this invention. It is a figure which shows the example which made the digital signal demodulation part used with a single tuner receiver one chip structure. It is a flowchart for demonstrating the channel switching operation | movement in a single tuner receiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Receiver, 11, 12 Tuner, 13, 14 Antenna, 15 Analog audio signal processing part, 16 Speaker, 17 Microcomputer, 18 Digital signal processing part, 21, 22 Analog-digital conversion part (A / D), 23, 24 FM / AM demodulation unit, 25, 35, 53 Circuit switching unit, 26 Analog / digital switching unit, 27 Audio unit, 28 Digital-analog conversion unit, 31, 32 IQ demodulation unit, 33, 34 FFT unit, 36, 71 OFDM demodulator, 37, 72 deinterleave error corrector, 38, 73 audio demodulator, 41, 42 comparison reference value memory, 43 digital quality detector, 44 analog quality detector, 45 OR (OR) gate, 46 AND ( AND) gate, 47 broadcast type determination means, 48 broadcast type reception memory, 49 broadcast Another setting memory, 50 control unit, 51 a frequency conversion unit, 52 a tuner control unit, 61 input unit, 62 display unit, 63 a switching control unit, 81 chips.

Claims (7)

In a receiving device that selectively receives broadcast waves including digital broadcast signals transmitted on different channels,
Each of the digital broadcast signals includes broadcast program type information indicating the type of broadcast program,
A broadcast wave of a channel different from the currently received broadcast wave is used as a monitor broadcast wave, and the broadcast program type information is monitored in the monitor broadcast wave, and the input broadcast program type information input by the user matches the broadcast program type information. A broadcast program type determination means for detecting whether or not to match and outputting a type match signal when matched,
Reception quality detection means for detecting reception quality of the broadcast wave in the monitoring broadcast wave;
Receiving control for receiving the monitoring broadcast wave as a received broadcast wave and outputting a broadcast program related to the received broadcast wave when receiving the type match signal when the reception quality detecting means determines that the reception quality is good. And a reception control means for performing the reception. Each of the broadcast waves is a mixture of analog broadcast signals and digital broadcast signals with the same center frequency of the carrier wave, and in the same broadcast wave, the analog broadcast signal and the digital transmission signal are transmitting the same broadcast program,
The reception quality detection means detects the reception quality of the analog broadcast signal in the monitoring broadcast wave and outputs an analog detection signal when the reception quality is good, and the reception quality of the digital broadcast signal in the monitoring broadcast wave And a digital reception quality detection means for outputting a digital detection signal when the reception quality is good,
2. The receiving apparatus according to claim 1, wherein the reception control means receives at least one of the analog detection signal and the digital detection signal and performs reception control when receiving a type match signal. Analog demodulation means for demodulating an analog broadcast signal and outputting a first demodulated signal;
Digital demodulation means for demodulating a digital broadcast signal and outputting a second demodulated signal;
4. The receiving apparatus according to claim 3, further comprising output switching means for selectively outputting the first and second demodulated signals in accordance with an analog detection signal and a digital detection signal.   2. A notification means for notifying that a reception broadcast wave can be received as a reception broadcast wave when the reception quality detection means determines that the reception quality is good and receives a type match signal. The receiving device according to claim 3. First and second receiving means for receiving broadcast waves;
A first analog demodulator connected to the first receiver for demodulating an analog broadcast signal; a first digital demodulator connected to the first receiver for demodulating a digital broadcast signal;
Second analog demodulation means connected to the second reception means for demodulating an analog broadcast signal;
Second digital demodulation means connected to the second reception means for demodulating a digital broadcast signal;
Either one of the first and second receiving means is used as a monitoring receiving means for receiving a monitoring broadcast wave, and an analog receiving means and an output of a digital demodulating means corresponding to the monitoring receiving means are each received as an analog signal. 3. The receiving apparatus according to claim 2, wherein the receiving apparatus is provided to the quality detection means and the digital reception quality detection means.   6. The receiving apparatus according to claim 5, wherein the reception control means receives a monitoring broadcast wave as a received broadcast wave by the monitoring reception means, and uses the reception means different from the monitoring reception means as the monitoring reception means. Receiving means for receiving broadcast waves;
An analog demodulator for demodulating an analog broadcast signal connected to the receiver; a digital demodulator for demodulating a digital broadcast signal connected to the receiver;
While the output from the analog demodulation means or the digital demodulation means is interrupted in the currently received broadcast wave, the reception means receives a broadcast wave of a channel different from the currently received broadcast wave, and the output of the analog demodulation means 3. A receiving apparatus according to claim 2, further comprising switching control means for supplying the output of the digital demodulation means to the analog reception quality detection means and the digital reception quality detection means, respectively.

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