JP4614906B2 - Receiver - Google Patents

Description

  The present invention relates to a broadcast signal and a reception device capable of receiving data multiplexed on the broadcast signal, and more particularly to an in-vehicle radio reception device that receives multiplexed data and phase diversity using two tuners. About.

  When a mobile object such as a vehicle receives FM broadcast or television broadcast, diversity reception using a plurality of antennas is generally performed in order to reduce fading such as multipath. Diversity includes a method of selecting a high-quality received signal from a plurality of antennas and a method of combining received signals from a plurality of antennas. The former has the advantage that the configuration is simple because it does not require a control circuit such as a phase, but has the disadvantage that it cannot compensate for waveform distortion.

  The latter is for synthesizing the received signal from the antenna, and controls the phase so that the level of the synthesized output is maximized, that is, the phase of the received signal is in phase. FIG. 10 shows a configuration example of phase diversity reception for combining received signals. Receiving devices 3 and 4 are connected to the antennas 1 and 2, respectively, and a phase shifter 5 is connected to the output of the receiving device 4. The phase difference between the output signal of the phase shifter 5 and the output signal of the receiving device 3 is a phase difference detection unit 6 is detected. The phase shifter 5 is feedback-controlled so that the detected phase difference disappears. As a result, the combiner 7 outputs a combined received signal having a maximum level.

  Patent Document 1 discloses a diversity control device for a mobile phone that selects either combined diversity or antenna selection switching diversity based on a received electric field level, a fading pitch, and received quality. Patent Document 2 discloses a diversity receiving circuit that selects antenna selection diversity if the difference in received intensity from each antenna sequence is equal to or greater than a threshold value, and selects signal combining diversity if the difference is not greater than the threshold value.

  In addition, in a vehicle-mounted receiving apparatus, when a vehicle moves during reception of a desired station and leaves the reception area, a new station must be selected. RDS (Radio Data System) is practically used in Europe to eliminate this inconvenience and automatically select stations that are broadcasting the same program even if they are out of the reception area. It has become. The RDS multiplexes and transmits various digital data to the FM broadcast signal. The multiplexed data is the FM broadcast program (program) identification code (PI) and program name (PS) currently received. ), Frequency list (AF) of the same program network, program content identification code (PTY), transmission status identification code (DI), music or conversation identification code (M / S), traffic information broadcasting station identification code (TP) ), And an identification code (TA) during traffic information broadcast. Using these data, it is possible to check whether or not the seeked broadcast station is broadcasting the same program as the currently received broadcast station, or seek to a desired broadcast station based on the AF list. .

  Patent Document 3 discloses such an RDS radio reception method. In this method, the main tuner and the sub-tuner are used, and while both tuners are tuned to the same desired station for a certain period of time, the diversity control circuit switches the switching circuit to the better reception state and outputs the sound, and a certain period of time has passed. Thereafter, the sub-tuner searches for an alternative station, and when no alternative station is found, the sub-side is again tuned to the same desired station as the main side. When a station is found by the alternative station search, if the reception state is not better than the desired station, the alternative station search is repeated as long as the station is found, and if no station is found, the station is returned to the desired station. If an alternative station whose reception state is better than that of the desired station is found in the alternative station search, the main tuner is tuned to the alternative station, and the alternative station is searched for the changed desired station as long as the station is found on the sub side. . This makes it possible to receive the desired program satisfactorily even when there is a vehicle in an area where no alternative station is found and the reception state is getting worse.

  Further, in Patent Document 4, when the microcomputer of the RDS receiver executes the AF list comparison process, the AF list comparison process is executed by the first FM tuner and the second FM tuner is made to extract multiple data, and the AF list comparison process is performed. Are not executed, the reception levels of the first FM tuner and the second FM tuner are compared and detected, and the diversity SW, the first switching SW, and the second switching SW are controlled based on the comparison result, whereby each FM tuner is audio-controlled. Each circuit is switched and connected to a circuit or RDS decoder. As a result, each tuner is effectively utilized.

  Patent Document 5 relates to an RDS receiver. In a normal reception state, the received electric field strengths of two tuners are compared, and a diversity operation for selecting a signal from a tuner having a large electric field strength by a main / sub switching circuit is executed. When the received electric field strength of the main tuner is smaller than the predetermined threshold value, the reception broadcast station of the main tuner is maintained as it is, and the signal from the main tuner is converted into sound. At the same time, the sub-tuner performs a seek operation within the same band, searches for the same broadcast as that received by the main tuner, and compares the received electric field strength with the electric field strength currently received by the main tuner. If the electric field strength is greater than the current electric field strength, the main tuner is tuned to the broadcast station to which the sub tuner seeks.

JP 2000-357983 A JP 2003-244043 A JP-A-5-102799 JP-A-7-321682 JP-A-5-75397

  However, the RDS receivers disclosed in Patent Documents 3 to 5 described above receive radio broadcasts and multiplexed data using two tuners, and enable diversity reception. However, especially in the case of an on-vehicle radio receiver, the reception status of the tuner changes as the vehicle moves. Therefore, unless the role or priority of each tuner is optimized, radio broadcasting and RDS data can be received appropriately. There is a problem that it becomes impossible. Further, since the face diversity operation must be turned off while one tuner is used for a broadcast station seek, it is desirable to reduce the time required for the seek as much as possible. Patent Documents 3 to 5 do not disclose or suggest configurations to solve such problems.

An object of the present invention is to provide a receiving apparatus that can simultaneously receive a broadcast signal and data multiplexed thereon and phase diversity reception using at least two tuners.
It is another object of the present invention to provide a receiving apparatus that can efficiently perform phase diversity operation while shortening the seek operation time of a broadcasting station.

  According to the present invention, a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal includes first and second receiving means respectively connected to at least two antennas, and first and second receiving Determining means for determining the receiving state of the first and second receiving means based on the received signal from the means, and the first and second receiving means are independent from each other when the determining means determines the first receiving state. And receiving control means for causing the first and second receiving means to execute in the phase diversity reception mode when the determination means determines that the second reception state is established.

  Preferably, the reception control means causes the first reception means to receive the broadcast signal of the desired station and causes the second reception means to seek another broadcast station when in the first reception state, or The receiving means seeks an alternative station of the desired station. Furthermore, the reception control means causes the second reception means to receive the same broadcast station as that received by the first reception means when in the second reception state, or the second reception means You may make it make an alternative station seek by a fixed period.

  Preferably, the second receiving means has a first seek operation for seeking the broadcast station with respect to a frequency within a certain range with reference to the frequency of the broadcast station received by the first receiving means, After the seek operation, a second seek operation for seeking a broadcasting station in another frequency range is included. The seek operation may be terminated only by the first seek operation, or the first seek operation and the second seek operation may be performed separately, and the interval between them may be assigned to the phase diversity operation.

  Further, the second receiving means compares the first threshold value with the electric field strength of the received signal to seek the broadcast station, and after the first seek operation, the first threshold value is set. You may make it include the 2nd seek operation | movement which compares the 2nd threshold value lower than a value with the electric field strength of a received signal, and seeks a broadcasting station. The seek operation may be terminated only by the first seek operation, or the first seek operation and the second seek operation may be performed separately, and the interval between them may be assigned to the phase diversity operation. The receiving device further includes display means for displaying the content sought by the second receiving means. The user can determine whether or not to continue the second seek operation by looking at the content displayed on the display means.

  Preferably, the determination means determines the first reception state when the electric field strength (for example, S meter) of the received signals from the first and second reception means is equal to or greater than a threshold value, and is less than the threshold value. The second reception state is determined. The determination means may further determine the first reception state when the amount of multipath noise is less than a threshold based on the received signal, and determine the second reception state when the amount is greater than or equal to the threshold. The determination unit may further determine the first reception state when the error rate of the multiplexed data is less than the threshold value, and determine the second reception state when the error rate is equal to or greater than the threshold value. .

  According to the present invention, a receiving method of a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal is based on the received signals received by the first and second tuners via at least two antennas. Determining the reception state of the first and second tuners, and when the reception state is determined to be the first state, the first and second tuners can be operated independently, and the reception state is the second state Causing the first and second tuners to execute in a phase diversity reception mode when the state is determined.

  According to the present invention, the receiving states of the first and second receiving means are determined based on the received signals from the first and second receiving means, and the operations of the first and second receiving means are performed according to the receiving state. Therefore, when the reception condition is good, the first and second receiving means can be operated independently to preferentially receive the desired station and multiplexed data, and the reception condition is poor. When this happens, fading such as multipath can be reduced by phase diversity reception, and reception sensitivity can be increased. Thereby, in particular, in an in-vehicle radio receiver, a good audio output and a data output with a low error rate can be obtained.

  The best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an in-vehicle radio receiving apparatus according to an embodiment of the present invention. The radio receiver 10 is connected to the main antenna 12 and the main antenna 12, and is connected to the main tuner 14, the sub-antenna 16, and the sub-antenna 16 that receive a broadcast signal or multiplexed data of a predetermined frequency from the selected broadcast station. , Receiving broadcast signals of a predetermined frequency from the selected broadcast station or received signals from the sub tuner 18, the main tuner 14 and the sub tuner 18 that receive multiplexed data, and executing various processes based on the received signals. A DSP 20, a main tuner 14, a sub-tuner 18, and a microcontroller (hereinafter referred to as a microcomputer) 22 that controls the DSP 20; an amplifier 24 that amplifies the audio signal processed by the DSP 20; a speaker 26 that outputs the audio signal amplified by the amplifier 24; DSP2 In a display unit 28 for displaying the decoded data.

  The main tuner 14 receives an RF signal from the main antenna 12 and an RF amplifier that amplifies the RF signal, a tuning circuit that selects a frequency signal of a desired station from the amplified RF signal, and a frequency signal and an RF signal from a local oscillator. A mixer for mixing and generating an intermediate frequency (IF) signal and an S meter circuit for detecting the intermediate frequency signal by direct current detection and extracting the received electric field strength signal (S meter signal) are included. Further, the main tuner 14 converts the intermediate frequency signal (IF) and the S meter signal into digital signals by an ADC (analog / digital converter), and outputs them to the DSP 20. The sub tuner 18 basically has the same configuration as that of the main tuner 14, and the digitized intermediate frequency signal (IF) and S meter signal are also output from the sub tuner 18 to the DSP 20.

  The DSP 20 executes various processes on the digital signals input from the main tuner 14 and the sub tuner 18. The DSP 20 performs signal processing such as FFT, digital filtering, signal synchronization, time / frequency deinterleaving, audio decoding, data decoding, and phase diversity. These signal processes are controlled by software stored in a program memory in the DSP 20.

  The microcomputer 22 is connected to the DSP 20 via a control bus, and controls reception operations of the DSP 20, the main tuner 14, and the sub-tuner 18 based on signals obtained from the DSP 20. Further, the microcomputer 22 stores the RDS data collected by the broadcast station seek by the sub tuner 18 and other seek results in the memory.

  Next, the operation of the radio reception apparatus will be described with reference to the flow of FIG. In this embodiment, RDS that multiplexes and transmits data to FM radio broadcast is targeted. The microcomputer 22 acquires the electric field strength (S meter) of the signal received by the main tuner 14 and the sub tuner 18 via the DSP 20 (step S101). Next, it is determined whether or not the electric field strengths of the main tuner 14 and the sub tuner 18 are equal to or greater than a threshold value (step S102). The threshold value is, for example, 60 dB which is a standard input.

  If the field strengths of both received signals are equal to or greater than the threshold value, the microcomputer 22 determines that the reception state is good (step S103), and operates the main tuner 14 and the sub tuner 18 independently (step S103). S104). The main tuner 14 receives a radio broadcast of a desired station, and the sub tuner 18 performs background seeking of an alternative station or another alternative station based on, for example, an AF list.

  The digital signal output from the main tuner 14 is input to the DSP 20. The DSP 20 audio-decodes the input digital signal and extracts the digital audio signal therefrom. Further, the input digital signal is subjected to data decoding, and RDS data multiplexed in the broadcast signal is extracted therefrom. The digital audio signal is output to the amplifier 24, where it is converted into an analog audio signal, amplified, and then output from the speaker 26. The extracted RDS data is displayed on the display unit 28 via the microcomputer 22, and for example, information such as the program name of the broadcast station currently received by the main tuner 14 is displayed.

  On the other hand, the sub tuner 18 searches for an alternative station based on, for example, the AF list, and the reception status of the alternative station is sequentially stored in the DSP 20 or the memory of the microcomputer 22. When an alternative station better than the reception state of the main tuner 14 is found, switching to the alternative station is performed.

  On the other hand, when the electric field strength of either the main tuner 14 or the sub tuner 18 is smaller than the threshold value, the microcomputer 22 determines that the reception state is not good (step S105), and causes the main tuner 14 and the sub tuner 18 to receive phase diversity. The mode is changed (step S106). The microcomputer 22 outputs a control signal to the DSP 20 and the sub tuner 18, causes the sub tuner 18 to receive the same broadcast station as the main tuner 14, and causes the DSP 20 to start signal processing for phase diversity. As a result, the phase control of the signals received by the main tuner 14 and the sub tuner 18 is performed, and the DSP 20 outputs an audio signal having the maximum output level. Further, when the mode is shifted to the phase diversity reception mode, the sub tuner 18 automatically follows the broadcast station received by the main tuner 14, but at a certain interval, the sub tuner 18 selects an alternative station or another broadcast station according to the AF list. Seek background. Thereby, if an alternative station with a good reception state is found, it is possible to switch to reception to the alternative station.

  FIG. 3 is a diagram illustrating the relationship between the operation mode switching of the radio reception apparatus and the output waveform. The vertical axis represents the signal output level, and the horizontal axis represents the electric field strength of the received signal. When the electric field strength of the received signal is 60 dB or more which is the standard input, the output level of the audio signal (Signal) is high and the level of the noise signal (Noise) is small. That is, the reception state is good, and at this time, the main tuner 14 and the sub tuner are operated independently. In other words, only the operation of receiving the RDS broadcast is performed, and the phase diversity reception is not performed.

  When the electric field strength of the received signal is smaller than 60 dB, the output level of the audio signal is reduced and the output level of the noise signal is increased. In this case, the reception state is bad and the mode is switched to the diversity mode. As described above, the main tuner 14 and the sub tuner 18 are set to the phase diversity reception mode, and the sub tuner 18 seeks an alternative station at a fixed timing or cycle. During this period, phase diversity reception is turned off.

  Next, a second embodiment of the present invention will be described. In the first embodiment, an example of shifting to the phase diversity reception mode depending on whether the electric field strength of the received signal is equal to or higher than the threshold value has been shown. However, in the second embodiment, the amount of multipath noise or noise is changed. The phase diversity reception mode is switched according to the level.

  The digital signals output from the main tuner 14 and the sub tuner 18 are subjected to digital filtering processing in the DSP 20, and multipath noise components are detected. FIG. 4 schematically shows the relationship between the amount of multipath (MP) and the frequency of a specific multipath. When the multipath amount is equal to or greater than a certain threshold value Th, it is determined that the reception state is bad, and the mode is shifted to the phase diversity reception mode. Thereby, even when the reception state by multipath deteriorates, the influence can be reduced.

  Next, a third embodiment of the present invention will be described. In the third embodiment, when there is an adjacent disturbance in the broadcast station that is received by the main tuner 14 and the sub tuner 18, the mode shifts to the phase diversity reception mode. For example, when there is a broadcasting station having an electric field strength of a certain value or more within a certain range from the frequency being received, it is determined that the reception state is poor due to adjacent interference. The presence / absence of adjacent interference can be determined, for example, by monitoring the output of the station detector. The station detector searches for an alternative station and the like, and is within the range of the frequency shift Δf (bandwidth) of the received signal and the received electric field strength is equal to or higher than a predetermined level. Judgment. This process is performed by the DSP 20.

  Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, when the error rate of the RDS data is equal to or greater than a certain threshold value, the phase diversity reception mode is entered. The RDS data is composed of a plurality of data blocks, and each block includes PI data, PS data, an AF list, and the like. These data are decoded by the DSP 20 where the error rate is detected. When the error rate is equal to or greater than a certain threshold, the reception state is determined to be bad, and the mode is shifted to the diversity reception mode. Thereby, the error rate of RDS data can be reduced.

  Next, a fifth embodiment of the present invention will be described. In the first to fourth embodiments, the example has two operation modes of the phase diversity reception mode and the other modes. In the fifth embodiment, more detailed multi-stage operation modes are provided. Is specified.

  FIG. 5 is a table showing operation modes of the radio receiving apparatus according to the fifth embodiment. In this figure, the mode 0 (good), mode 1 (Better), mode 2 (Could be), mode 3 (Should be), and mode 4 (Must) are in order from the best reception state. As described in the first to fourth embodiments, the levels of these reception states are the received signal field strength (S / M), multipath (M / P), adjacent interference (A / I), And four causes of data error rate (SYNC). If one of the four causes has the lowest reception state, the lowest reception state is obtained even if the other three reception states are good.

  FIG. 6 shows an example when the field strength of the received signal is switched from mode 0 to mode 4. A plurality of threshold values Th0, Th1, Th2, Th3 are set for the electric field strength. For example, if the standard input is 60 dB (Th1) or more and is larger than the threshold value Th0, the mode 0, the threshold values Th1 and Th0 If it is between, it becomes mode 1. When it is less than the threshold value Th1, the mode becomes the mode 2, mode 3, and mode 4 according to the respective threshold values Th2 and Th3, and the phase diversity reception mode is set.

  In FIG. 5, “SAFS” is an abbreviation for Station Auto Finding System and means a background seek. “PD” is an abbreviation for Phase Diversity. “AF SW” is an abbreviation for Alternative Frequency Switch, and means automatic tracking or switching to an alternative station. “AF check” is an abbreviation for Alternative Frequency Check, which means checking for the presence of an alternative station.

  FIG. 7 is a diagram showing the operation states of the main tuner 14 and the sub tuner 18 corresponding to each operation mode. In the case of “SAFS”, the main tuner 14 receives a desired station, and the sub-tuner 18 seeks another RDS broadcast station or an alternative station.

  In the case of “PD”, the main tuner 14 receives the desired station, and the sub tuner 18 receives the same desired station as the main tuner 14. In the case of “SAFS Check”, the main tuner 14 receives the desired station, and the sub-tuner 18 seeks an alternative station.

  When “PD / AF SW” is selected, the main tuner 14 receives the desired station, and the sub-tuner 18 automatically switches to the alternative station at a constant period while receiving the same desired station as the main tuner. During the period of automatic switching, phase diversity reception is turned off. The sub tuner 18 receives the RDS data from the alternative station, and the microcomputer 22 confirms whether or not the broadcasting station is the same as the main tuner 14 based on the RDS data. If they are the same broadcast station and the electric field strength of the received signal is better than that of the main tuner, the reception is switched to an alternative station.

  As described above, according to the embodiment of the present invention, the mode is switched according to the reception state of the radio receiver, that is, when the reception state is good, the main tuner and the sub tuner are operated independently to prioritize the RDS operation. When the reception condition deteriorates, phase diversity reception is prioritized, so even if the vehicle moves out of the coverage area of the broadcast station, it automatically searches for the alternative station and receives the alternative station. Can be performed smoothly, and even if radio wave fading occurs, the influence can be reduced.

  Next, a sixth embodiment of the present invention will be described with reference to the flowcharts of FIGS. As described above, the sub-tuner 18 seeks a broadcast station in the background for a certain period or period during the phase diversity operation. In order to shorten the seek operation and efficiently perform the phase diversity operation. The following method is used.

(1) In the case of a specification that preferentially displays the surrounding stations of the currently receiving broadcast station on the display unit 28:
When the reception intensity of the main tuner 14 and the sub tuner 18 is less than 60 dB, the microcomputer 22 causes both tuners to perform a phase diversity operation (step S201). The microcomputer 22 determines whether or not to perform the first seek operation while allowing the sub tuner 18 to receive the same broadcast station as the main tuner 14 (step S202). For example, the first seek operation is performed when a certain period has elapsed from the start of the phase diversity operation or at a certain cycle.

  When performing the first seek operation, the microcomputer 22 sets a frequency of ± 3 MHz with reference to the frequency of the broadcast station that the main tuner 14 is currently receiving, and the first seek is sent to the sub tuner 18 within the range. (Step S203). The sub-tuner 18 collects RDS data from a broadcasting station having a certain reception strength (step S204). The collected RDS data includes data such as receivable broadcast programs and broadcast station names, and is held in the memory of the microcomputer 22. When the collection of RDS data is completed (step S205), the microcomputer 22 creates a list including these data and displays it on the display unit 28. Thus, at the start of list creation, the main seeker 14 performs the first seek operation on the frequency of the broadcasting station ± 3 MHz currently received, and preferentially displays the RDS data collected in that range. Thus, the seek operation can be shortened, and a list of parts that can be easily seen by the user can be created with the highest priority.

  Next, the microcomputer 22 may temporarily end the first seek according to the reception intensity, or may continue the next second seek (step S206). The second seek may collect RDS data for frequencies that have not been executed by the first seek after a lapse of a fixed time from the first seek. Subsequent operations are the same as those in the first seek (steps S207, S208, and S209).

  Normally, seek operation sweeps the frequency from low to high frequency, or vice versa from high to low frequency, but this technique sweeps all frequencies, so the RDS data It takes a very long time to collect and create a list. For this reason, the phase diversity operation must be turned off during the seek operation. On the other hand, as in this embodiment, the first seek operation and the second seek operation are divided, and the first seek operation is prioritized to prevent the phase diversity operation from being turned off continuously for a long period of time. can do.

(2) For specifications that preferentially display the top several stations with good radio conditions:
In the seek operation, RDS data is normally collected for a broadcasting station that has reached the seek stop level. In this embodiment, the threshold for determining the electric field strength of the received signal is increased in the first round. To collect data only for broadcasting stations with very good radio conditions.

  When the microcomputer 22 enters the face diversity operation (step S301), the microcomputer 22 sets a first threshold value (step S302). As described above, this threshold value is compared with the electric field strength of the received signal by the sub-tuner 18 and used for determining the reception state.

  The sub-tuner 18 performs a first seek based on the first threshold (step S303), and collects RDS data of a broadcasting station with good radio field strength (step S304). When the collection of RDS data is completed (step S305), the microcomputer 22 determines whether or not to perform the second seek by the sub tuner 18 according to the reception status of the main tuner 14 (step S306). If the reception sensitivity of the main tuner 14 is worse, the second seek may not be performed and the phase diversity operation may be restored. When performing the second seek operation, the microcomputer 22 sets a second threshold value lower than the first threshold value (step S307), and the reception sensitivity is higher than that during the first seek operation. A bad broadcasting station is sought and RDS data is collected (step S308).

  In this way, a list of higher-level stations with good radio wave conditions is created, and this is preferentially displayed on the display unit 28, so that the seek operation is shortened and the user's specifications are satisfied, and the phase diversity operation is efficiently performed. be able to.

  According to the sixth embodiment, the functions that cannot be performed simultaneously by the two tuners of the phase diversity operation and the list creation can be achieved by applying the specifications according to the radio wave condition and the customer request. In addition, user satisfaction can be improved by creating a list with a short seek operation.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible. In the above embodiment, RDS radio reception is exemplified, but the present invention is also applied to a radio reception apparatus that receives data multiplexed on an FM broadcast signal, and a reception apparatus that receives radio broadcast and television broadcast. Can also be applied.

  The receiving apparatus according to the present invention is preferably used in an in-vehicle radio receiving apparatus, an AV apparatus or a navigation apparatus having such a radio receiving function.

It is a block diagram which shows the structure of the receiver which concerns on the Example of this invention. It is a figure which shows the operation | movement flow of the receiver of a present Example. It is a figure which shows the switching of a phase diversity reception mode, and the relationship of an output waveform. It is a figure which shows typically the relationship between the amount of multipaths in a 2nd Example, and phase diversity reception. It is a table | surface which shows the operation mode of the radio receiver of 5th Example. It is a figure which shows the example when switching the electric field strength from mode 0 to mode 4 by the 5th Example. It is a figure explaining the operation state of the main tuner and sub tuner corresponding to an operation mode. It is a flowchart which shows the seek operation | movement of the receiver which concerns on the 6th Example of this invention. It is a flowchart which shows the other seek operation | movement of the receiver which concerns on the 6th Example of this invention. It is a figure which shows one structural example of the phase diversity reception which synthesize | combines the received signal from a some antenna.

Explanation of symbols

10: Receiver 12: Main antenna 14: Main tuner 16: Sub antenna 18: Sub tuner 20: DSP
22: Microcomputer 14: Amplifier 26: Speaker 28: Display unit

Claims (20)

A receiving device capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
First and second receiving means respectively connected to at least two antennas;
Determining means for determining the reception states of the first and second receiving means based on the received signals from the first and second receiving means;
When the first receiving state is determined by the determining unit, the first and second receiving units can be operated independently. When the second receiving state is determined by the determining unit, the first and second receiving states are enabled. Reception control means for causing the reception means to execute in a phase diversity reception mode,
The determination means determines the first reception state when the electric field strength of the received signals from the first and second reception means is equal to or higher than the threshold value, and determines the second reception state when the electric field strength is lower than the threshold value,
In the phase diversity reception mode, the second reception means compares the first threshold value with the level of the reception state to seek the broadcast station, and after the first seek operation, A receiving apparatus comprising: a second threshold value lower than a threshold value of 1 and a second seek operation for comparing the level of the reception state to seek a broadcasting station. A receiving device capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
First and second receiving means respectively connected to at least two antennas;
Determining means for determining the reception states of the first and second receiving means based on the received signals from the first and second receiving means;
When the first receiving state is determined by the determining unit, the first and second receiving units can be operated independently. When the second receiving state is determined by the determining unit, the first and second receiving states are enabled. Reception control means for causing the reception means to execute in a phase diversity reception mode,
The determination means determines the first reception state when the amount of multipath noise is less than a threshold based on the received signal, and determines the second reception state when the amount is greater than or equal to the threshold,
In the phase diversity reception mode, the second reception means compares the first threshold value with the level of the reception state to seek the broadcast station, and after the first seek operation, A receiving apparatus comprising: a second threshold value lower than a threshold value of 1 and a second seek operation for comparing the level of the reception state to seek a broadcasting station. A receiving device capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
First and second receiving means respectively connected to at least two antennas;
Determining means for determining the reception states of the first and second receiving means based on the received signals from the first and second receiving means;
When the first receiving state is determined by the determining unit, the first and second receiving units can be operated independently. When the second receiving state is determined by the determining unit, the first and second receiving states are enabled. Reception control means for causing the reception means to execute in a phase diversity reception mode,
The determination means determines the first reception state when the error rate of the received data is less than the threshold, and determines the second reception state when the error rate is greater than or equal to the threshold,
In the phase diversity reception mode, the second reception means compares the first threshold value with the level of the reception state to seek the broadcast station, and after the first seek operation, A receiving apparatus comprising: a second threshold value lower than a threshold value of 1 and a second seek operation for comparing the level of the reception state to seek a broadcasting station. A receiving device capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
First and second receiving means respectively connected to at least two antennas;
Determining means for determining the reception states of the first and second receiving means based on the received signals from the first and second receiving means;
When the first receiving state is determined by the determining unit, the first and second receiving units can be operated independently. When the second receiving state is determined by the determining unit, the first and second receiving states are enabled. A reception control means for executing the reception means in a phase diversity reception mode;
Display means,
The determination means determines the first reception state when the electric field strength of the received signals from the first and second reception means is equal to or higher than the threshold value, and determines the second reception state when the electric field strength is lower than the threshold value,
In the phase diversity reception mode, the second receiving means can receive a broadcast station by seeking the broadcast station for a frequency within a certain range based on the frequency of the broadcast station received by the first receiving means. A first seek operation for receiving data multiplexed in a broadcast signal of the first and a broadcast signal of a broadcast station that can be received by seeking a broadcast station in another frequency range after the first seek operation. A second seek operation for receiving the received data,
The display unit is a receiving device that preferentially displays data received by the first seek operation of the second receiving unit. A receiving device capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
First and second receiving means respectively connected to at least two antennas;
Determining means for determining the reception states of the first and second receiving means based on the received signals from the first and second receiving means;
When the first receiving state is determined by the determining unit, the first and second receiving units can be operated independently. When the second receiving state is determined by the determining unit, the first and second receiving states are enabled. A reception control means for executing the reception means in a phase diversity reception mode;
Display means,
The determination means determines the first reception state when the amount of multipath noise is less than a threshold based on the received signal, and determines the second reception state when the amount is greater than or equal to the threshold,
In the phase diversity reception mode, the second receiving means can receive a broadcast station by seeking the broadcast station for a frequency within a certain range based on the frequency of the broadcast station received by the first receiving means. A first seek operation for receiving data multiplexed in a broadcast signal of the first and a broadcast signal of a broadcast station that can be received by seeking a broadcast station in another frequency range after the first seek operation. A second seek operation for receiving the received data,
The display unit is a receiving device that preferentially displays data received by the first seek operation of the second receiving unit. A receiving device capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
First and second receiving means respectively connected to at least two antennas;
Determining means for determining the reception states of the first and second receiving means based on the received signals from the first and second receiving means;
When the first receiving state is determined by the determining unit, the first and second receiving units can be operated independently. When the second receiving state is determined by the determining unit, the first and second receiving states are enabled. A reception control means for executing the reception means in a phase diversity reception mode;
Display means,
The determination means determines the first reception state when the error rate of the received data is less than the threshold, and determines the second reception state when the error rate is greater than or equal to the threshold,
In the phase diversity reception mode, the second receiving means can receive a broadcast station by seeking the broadcast station for a frequency within a certain range based on the frequency of the broadcast station received by the first receiving means. A first seek operation for receiving data multiplexed in a broadcast signal of the first and a broadcast signal of a broadcast station that can be received by seeking a broadcast station in another frequency range after the first seek operation. A second seek operation for receiving the received data,
The display unit is a receiving device that preferentially displays data received by the first seek operation of the second receiving unit. The reception control means causes the first reception means to receive the broadcast signal of the desired station and causes the second reception means to seek another broadcast station when in the first reception state . receiver according to one Reception control means, when in the first reception mode, to receive a broadcast signal of the desired station to the first receiving means, said to seek an alternative station of the desired station to the second receiving means, claims 1 6 The receiving device according to any one of the above. Reception control means, when in the second reception mode, the second receiving means, to receive the same broadcast station and the broadcast station that the first receiving means receives, in 6 one claims 1 The receiving device described. The receiving apparatus according to any one of claims 1 to 6 , wherein the reception control means makes the second receiving means seek an alternative station at a constant period when in the second reception state. Receiving apparatus further includes display means for displaying a first seek to contents by the seek operation of the second receiving means with priority, the reception apparatus according to 3 any one claims 1. The receiving apparatus according to claim 1, wherein the first and second receiving means receive RDS data multiplexed in radio broadcasting. A receiving method of a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
Determining reception states of the first and second tuners based on reception signals received by the first and second tuners via at least two antennas;
When the reception state is determined to be the first state, the first and second tuners can be operated independently. When the reception state is determined to be the second state, the first and second tuners are phased. And executing in diversity reception mode,
In the determining step, when the electric field strength of the received signals from the first and second receiving means is greater than or equal to a threshold value, the first reception state is determined, and when the received signal strength is less than the threshold value, the second reception state is determined. ,
In the phase diversity reception mode, the second tuner compares the first threshold value with the level of the reception state to seek the broadcast station, and after the first seek operation, the first tuner And a second seek step for seeking the broadcast station by comparing the level of the reception state with a second threshold value lower than the threshold value. A receiving method of a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
Determining reception states of the first and second tuners based on reception signals received by the first and second tuners via at least two antennas;
When the reception state is determined to be the first state, the first and second tuners can be operated independently. When the reception state is determined to be the second state, the first and second tuners are phased. And executing in diversity reception mode,
The step of determining determines the first reception state when the amount of multipath noise is less than a threshold based on the received signal, and determines the second reception state when the amount of multipath noise is equal to or greater than the threshold,
In the phase diversity reception mode, the second tuner compares the first threshold value with the level of the reception state to seek the broadcast station, and after the first seek operation, the first tuner And a second seek step for seeking the broadcast station by comparing the level of the reception state with a second threshold value lower than the threshold value. A receiving method of a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
Determining reception states of the first and second tuners based on reception signals received by the first and second tuners via at least two antennas;
When the reception state is determined to be the first state, the first and second tuners can be operated independently. When the reception state is determined to be the second state, the first and second tuners are phased. And executing in diversity reception mode,
The determining step determines the first reception state when the error rate of the received data is less than the threshold, and determines the second reception state when the error rate is equal to or greater than the threshold;
In the phase diversity reception mode, the second tuner compares the first threshold value with the level of the reception state to seek the broadcast station, and after the first seek operation, the first tuner And a second seek step for seeking the broadcast station by comparing the level of the reception state with a second threshold value lower than the threshold value. A receiving method of a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
Determining reception states of the first and second tuners based on reception signals received by the first and second tuners via at least two antennas;
When the reception state is determined to be the first state, the first and second tuners can be operated independently. When the reception state is determined to be the second state, the first and second tuners are phased. And executing in diversity reception mode,
In the determining step, when the electric field strength of the received signals from the first and second receiving means is greater than or equal to a threshold value, the first reception state is determined, and when the received signal strength is less than the threshold value, the second reception state is determined. ,
In the phase diversity reception mode, the second tuner broadcasts a broadcast station that can be received by seeking the broadcast station for a frequency within a certain range based on the frequency of the broadcast station received by the first tuner. A first seek step for receiving data multiplexed on a signal, and after the first seek step, multiplexed on a broadcast signal of a broadcast station that can be received by seeking a broadcast station in another frequency range A second seek step for receiving data,
The receiving method further includes a step of preferentially displaying the data received by the first seek step of the second tuner. A receiving method of a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
Determining reception states of the first and second tuners based on reception signals received by the first and second tuners via at least two antennas;
When the reception state is determined to be the first state, the first and second tuners can be operated independently. When the reception state is determined to be the second state, the first and second tuners are phased. And executing in diversity reception mode,
The step of determining determines the first reception state when the amount of multipath noise is less than a threshold based on the received signal, and determines the second reception state when the amount of multipath noise is equal to or greater than the threshold,
In the phase diversity reception mode, the second tuner broadcasts a broadcast station that can be received by seeking the broadcast station for a frequency within a certain range based on the frequency of the broadcast station received by the first tuner. A first seek step for receiving data multiplexed on a signal, and after the first seek step, multiplexed on a broadcast signal of a broadcast station that can be received by seeking a broadcast station in another frequency range A second seek step for receiving data,
The receiving method further includes a step of preferentially displaying the data received by the first seek step of the second tuner. A receiving method of a receiving apparatus capable of receiving a broadcast signal and data multiplexed on the broadcast signal,
Determining reception states of the first and second tuners based on reception signals received by the first and second tuners via at least two antennas;
When the reception state is determined to be the first state, the first and second tuners can be operated independently. When the reception state is determined to be the second state, the first and second tuners are phased. And executing in diversity reception mode,
The determining step determines the first reception state when the error rate of the received data is less than the threshold, and determines the second reception state when the error rate is equal to or greater than the threshold;
In the phase diversity reception mode, the second tuner broadcasts a broadcast station that can be received by seeking the broadcast station for a frequency within a certain range based on the frequency of the broadcast station received by the first tuner. A first seek step for receiving data multiplexed on a signal, and after the first seek step, multiplexed on a broadcast signal of a broadcast station that can be received by seeking a broadcast station in another frequency range A second seek step for receiving data,
The receiving method further includes a step of preferentially displaying the data received by the first seek step of the second tuner. The reception method according to any one of claims 13 to 18 , wherein, in the phase diversity reception mode, the second tuner periodically performs seek of an alternative station. 16. The receiving method according to claim 13, further comprising a step of preferentially displaying the data received by the first seek step of the second tuner .

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