JPH11251944A - Receiver for multiplex broadcasting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent movement to an RDS(radio data system) station different from the RDS station desired by a user caused by adjacent interference or the like, to prevent the preparation of an erroneous AF(alternative frequency) list and to perform a smooth follow-up operation. SOLUTION: In a microcomputer 17, whether or not the RDS data of one group are obtained is judged, the PI code (program identification code) of the RDS data is decided under a reception condition where an SD state in data reception is excellent and the PI code and the PI code of the RDS data received thereafter are compared. When they are the same PI data, the other RDS data are fetched and the AF list and PTY data, etc., are prepared. Also, in the case that the PI data are not obtained, the state of SD in the data reception is monitored for a prescribed period, whether the PI data are valid or invalid is judged by the SD state, the PI data at the time of being valid are obtained, the other RDS data are fetched based on the PI data and the AF list and the PTY data, etc., are prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for receiving a program broadcast from a multiplex broadcast radio wave including a program broadcast and data multiplexed on the program broadcast, and an RDS (Radio Data Set) for multiplexed data multiplexed on the program broadcast. Radio data system) The present invention relates to a multiplex broadcast receiving apparatus for acquiring data.

[0002]

2. Description of the Related Art In a multiplex broadcast, information such as information related to the program broadcast and traffic information are multiplexed on a broadcast radio wave of an FM radio broadcast, and a receiving side decodes the multiplexed information to obtain the radio broadcast. RDS (Radio Data Transmission) that can provide various services to broadcast listeners
System) system.

[0003] Such an RDS system is widely used in Europe and the like where many broadcasting stations form a network and broadcast the same program, and a stereophonic frequency of 19 KHz outside the frequency band of the FM modulation wave. 3 of pilot signal
57 KHz, which is the second harmonic, is used as a sub-carrier, and the sub-carrier is amplitude-modulated by a data signal indicating information such as program-related information and traffic information which has been filtered and bi-phase coded. This amplitude-modulated sub-carrier is wave-number-modulated and broadcast.

FIG. 3 is an explanatory diagram showing a baseband coating structure of RDS data.

[0005] As shown in FIG.
Each group is composed of four blocks A, B, 26 bits each consisting of 104 bits.
Each of the blocks A, B, C, and D is composed of a 16-bit information word (m1 to m15), a 10-bit check word and an offset word (c'0 to c'9). ing.

In block A, program identification data (hereinafter simply referred to as a PI code) indicating a network consisting of country name data and program data, and in block B, traffic program identification data indicating identification data of a traffic information broadcasting station. (Less than,
Block C includes traffic announcement identification data (hereinafter, simply referred to as TA data) indicating identification data in traffic information, which is included in the frequency of each station of the network station group broadcasting the same program. Related data, that is, alternative frequency data (hereinafter, simply referred to as AF data), and broadcast station name data such as a broadcast station name and a network name (hereinafter, simply referred to as PS data) are arranged in the block D. .

The groups A, B, C, and D are classified into 16 types of types 0 to 15 with 4 bits according to the contents thereof. Two versions of B are defined, and their recognition codes are located in block B.

Usually, as a type defined in the version A, a block A always includes a PI code, but as a type defined in the version B,
In addition to block A, block C also includes a PI code. However, the rate at which this version B type is transmitted is very small.

A multiplex broadcast receiving apparatus using such RDS data fetches AF data obtained by demodulation at the time of receiving the RDS data and stores the AF data in a memory. An automatic tracking system is provided for selecting an alternative station, which is another network station having a good reception level, based on the AF data stored in the memory, when the reception level of the middle broadcasting station decreases. By using this automatic tracking system, it is possible to provide a user with a broadcast of the same program that is always in a good reception state without being affected by disturbance.

[0010]

Conventionally, in such a multiplex broadcast receiving apparatus, when acquiring a RDS data, if a PI code can be acquired, a broadcasting station which performs an RDS service, that is, an RDS station Is determined, the AF list, TP data, TA data, PS data, and the like, which are other RDS data, are obtained.

When the PI code changes, it is determined that the RDS data belongs to another broadcast station due to adjacent interference of another broadcast station having a different program, and the AF data is fetched into the memory to store the AF data. A method such as prohibiting the process of creating a list is adopted.

However, if the RDS data of the wrong station is fetched first, the PI code and the AF list of the station are created, and the receiver follows up based on the AF list. There is a problem that the mobile terminal moves to an RDS station different from the RDS station that has been used.

[0013] The present invention solves the above-mentioned problems, and prevents the user from moving to an RDS station different from the RDS station desired by the user due to adjacent interference or the like, and prevents creation of an erroneous AF list. It is another object of the present invention to provide a multiplex broadcast receiving apparatus that enables a smooth following operation.

[0014]

According to a first aspect of the present invention, there is provided an FM tuner comprising: an FM tuner, wherein the FM tuner includes a program broadcast and multiplex data including multiplexed data multiplexed on the program broadcast; While receiving broadcast radio waves, the F
A multiplex broadcast receiving device comprising: a control unit that causes an M tuner to follow an alternative station frequency having a good reception condition; and a storage unit that captures and stores received multiplexed data,
The control means tunes the FM tuner to a certain broadcasting station, and determines whether or not multiplex data obtained from multiplex broadcasting waves of the broadcasting station has been acquired for a predetermined group. A program identification code acquisition determining means for determining whether a program identification code has been obtained from the multiplexed data under a reception condition where the electric field strength is good, when the determination means determines that the multiplexed data has been obtained for a predetermined group; When the identification code acquisition determining means determines that the program identification code has been acquired, the acquired program identification code is compared with the program identification code of the multiplexed data acquired thereafter to determine whether or not they match. If it is determined that the identification code comparison and determination means and the program identification code comparison and determination means match, Based on over de, characterized in that it comprises a first data producing means for storing the created to the storage means the data containing the alternative frequency list from the multiplexed data.

According to the present invention, multiplexed data such as RDS data is obtained, and the program identification code of the multiplexed data is determined as the program identification code of the broadcasting station under the reception condition where the electric field strength state during data reception is good. The program identification code is compared with the program identification code of multiplexed data received thereafter, and when the same program identification data is obtained, the other multiplexed data of AF data, TP data, TA data and PT
The Y data is taken in and the AF list and PTY data are created.
Prevents movement to an RDS station different from the S station, and prevents incorrect A
The creation of the F-list is prevented, and a smooth following operation is also possible.

According to a second aspect of the present invention, even if the program identification code comparison and determination means determines that they do not match, data including PS data arbitrarily selected from the multiplexed data is created and stored. Further, there is provided a second data generating means for storing the data in the.

According to the present invention, data including PS data arbitrarily selected from multiplexed data can be created even if the program identification codes do not match.

According to a third aspect of the present invention, there is provided an FM tuner. The FM tuner receives a multiplex broadcast wave including a program broadcast and multiplex data multiplexed on the program broadcast, and obtains the multiplex broadcast wave from the multiplex broadcast wave. Multiplex broadcast receiving apparatus comprising: control means for causing the FM tuner to follow an alternative station frequency having good reception conditions based on a list of alternative frequencies to be received, and storage means for receiving and storing received multiplex data. Means for tuning the FM tuner to a certain broadcasting station to determine whether or not multiplexed data obtained from broadcast waves of the broadcasting station has been acquired for a predetermined group; If it is determined that the multiplexed data has been acquired for a predetermined group, the program identification code is obtained from the multiplexed data under the reception condition with good electric field strength. A program identification code acquisition determining means for determining whether or not a program identification code has been obtained, and if it is determined that the program identification code has not been obtained by the program identification code obtaining determination means, a predetermined period during which the multiplexed data can be obtained, An acquisition period determining means for determining whether or not the electric field strength is maintained under a good reception condition; and determining that the program identification code is maintained under a good reception condition by the acquisition period determination means. A program identification code determining means for determining whether or not the program is valid for a predetermined number of times; and multiplexing based on the program identification code when the program identification code is determined to be valid for the specified number of times. Data generating means for generating data including an alternative frequency list from the data and storing the data in the storage means.

According to the present invention, even when the program identification data has not been acquired, the state of the electric field intensity during data reception is monitored for a predetermined period, and the program identification data is valid for a specified number of times according to the electric field intensity state. It is determined whether or not there is, and when the designated number of times is valid, the program identification data is acquired, and based on this program identification data, AF data which is another multiplexed data,
Since the TP data, TA data, and PTY data are taken in to create an AF list, PTY data, etc., an RDS station different from the RDS station desired by the user due to adjacent interference, etc.
This prevents movement to a station and prevents creation of an erroneous AF list, and also enables smooth follow-up operation.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multiplex broadcast receiving apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an RDS receiver to which a receiving device for multiplex broadcasting according to the present invention is applied.

In FIG. 1, an RDS receiver includes an antenna 11 for receiving a program broadcast and FM multiplex broadcast radio waves including RDS data multiplexed on the program broadcast, which are broadcast from a plurality of broadcast stations. FM tuner 12 for receiving the broadcast wave of the
Supplies a local oscillation frequency OSC to the FM tuner 12 for tuning to a desired broadcast wave to be received by the
Circuit 13 and extracts only the low frequency component from the error signal E01 output from the PLL circuit 132 to extract the synchronization voltage VT
Low-pass filter (LPF) that supplies the signal to the FM tuner 12
An RDS decoder 15 for extracting RDS data from a detection output signal detected by the FM tuner 12;
An electric field strength detection circuit 16 for detecting the electric field strength (SD signal) of the received signal from the detection output signal detected by the tuner 12
And a microcomputer (hereinafter referred to as a microcomputer) 17 for controlling the entire RDS receiver.

The microcomputer 17 includes an RDS decoder 1
The RDS data extracted in step 5, the SD signal detected by the electric field strength detection circuit 16 and the like are input, and the microcomputer 17 sends a signal to the PLL circuit 13 to select a station for transferring to an alternative station having a good reception level. A command and a tuning command by a user are supplied.

The FM tuner 12 selects a desired station from the FM multiplex broadcast received through the antenna 11, converts the received frequency of the station into an intermediate frequency, and amplifies the intermediate frequency. An FM detector 122 for FM detecting a frequency signal;
A multiplexer 123 is provided for demodulating the detection output signal of the detector 122 into an audio signal and separating the signal into audio signals of L (left) and R (right) channels in the case of stereo broadcasting.

The RDS receiver has a multiplexer 1
23, audio changer (CD)
/ AC) 18 and an input switching unit 20 for switching and selecting an audio signal from the mechanical unit 19 of the tape deck, an electronic volume 21 for adjusting the volume of the audio signal switched and selected by the input switching unit 20, and A power amplifier 22 that amplifies an audio signal whose volume has been adjusted by an electronic volume 21, a speaker 23 that is driven by the audio signal output from the power amplifier 22 and outputs audio, and a power supplied to each unit of the RDS receiver. A power supply controller 24 for controlling and monitoring is further provided, and these components are controlled by the microcomputer 17.

Further, the microcomputer 17 stores AF data and PI which are RDS data extracted by the RDS decoder 15.
A memory (storage means) 25 for storing the SD data and the like detected by the code and the electric field strength detection circuit 16 and an operation unit 26 for inputting various operation commands are connected. The operation unit 26 has a key matrix 27 for inputting various operation commands and an LCD drive 29 for displaying various information on a liquid crystal display (LCD) 28.

The microcomputer 17 tunes the FM tuner 12 to a certain broadcasting station, and determines whether or not a predetermined group of RDS data obtained from broadcast waves of the broadcasting station has been acquired. When the acquisition determining means 171 determines that the RDS data has been acquired in a predetermined group, the SD data detected by the electric field strength detection circuit 16 is monitored, and the RDS decoder is provided under a good reception condition in which the SD data becomes "H" level. PI code acquisition determining means 172 for determining whether or not the PI code PIi has been acquired from the RDS data taken in from step 15
And the PI code acquisition determining means 172 determines that the PI code P
When it is determined that Ii has been acquired, the PI code comparison and determination unit 173 that compares the acquired PI code PIi with the PI code of the acquired group and determines whether or not these PI codes match with each other. When the PI code acquisition determining means 172 determines that the PI code PIi has not been acquired, the SD data is held under a good reception condition in which the SD data is at the “H” level for a predetermined period during which the RDS data of the predetermined group can be obtained. An acquisition period determination unit 174 for determining whether or not the PI code PIi is valid for a predetermined number of times when the acquisition period determination unit 174 determines that the reception condition is good for a predetermined period. P
When the I code determination means 175 and the PI code comparison determination means 173 determine that they match, or when the PI code determination means 175 determines that they match the specified number of times, the AF code is calculated from the RDS data based on the PI code. Even if the first data creation unit 176 that creates the list and creates the PTY data and the PI code comparison determination unit 173 determine that they do not match, the PS data and the CT data (time data) arbitrarily selected from the RDS data are determined. And second data creating means 177 for creating data including the date and the date.

Next, the processing operation performed by the microcomputer 17 will be described with reference to the flowchart shown in FIG.

When the processing program shown in FIG. 2 starts, first, it is determined whether or not the FM tuner 12 is receiving (step S1). Here, if the FM tuner 12 is not receiving, the processing of the microcomputer 17 ends. If the FM tuner 12 is receiving, the group acquisition determining unit 171 determines
The FM tuner 12 is tuned to a certain broadcasting station, and it is determined whether or not one group of RDS data (see FIG. 3) obtained from the broadcasting wave of the broadcasting station through the RDS decoder 15 is taken into the microcomputer 17 (step S).
2) The process of step S2 is repeatedly executed until one group of RDS data is taken into the microcomputer 17.

When the group acquisition determining means 171 determines that the RDS data for one group has been taken into the microcomputer 17, the PI code acquisition determining means 172 determines that the SD data detected by the electric field strength detecting circuit 16 is correct. Is monitored, and it is determined whether or not the PI code PIi has been obtained from the RDS data fetched from the RDS decoder 15 under a favorable reception condition in which the SD data is at the “H” level (step S3).

Here, when the PI code acquisition determining means 172 determines that the PI code PIi has been acquired, the acquired PI code PIi and the PI
The code is compared to determine whether they match (step S4).

If it is determined that they match, the first data creation means 176 creates an AF list from the acquired RDS data based on the matched PI code, and creates PTY data. It is stored in the memory 25 (step S5).

If they do not match in step S4, the RD acquired by the second data
From S data to PS data and CT data (time and date)
Is created and stored in the memory 25 (step S6). Thereafter, it is determined whether the reception process has been completed (step S
7) If the reception has been completed, the processing of FIG. 2 ends, and if not, the process returns to step S2.

On the other hand, if the PI code acquisition determining means 172 determines in step S3 that the PI code PIi has not been obtained, the obtaining period determining means 174 determines that a predetermined group of RDS data can be obtained. During this period, the SD data detected by the electric field strength detection circuit 16 is monitored, and it is determined whether or not the SD data has been maintained for a predetermined period under a favorable reception condition in which the SD data is at the "H" level (step S8).

Here, when the acquisition period determining means 174 determines that a good reception state is not maintained for a predetermined period due to the SD state during data reception, the process returns to step S2, and the processing of step S2 and subsequent steps is executed again.

If it is determined in step S8 that the SD state during data reception is in a good reception state,
The PI code determination means 175 determines whether the valid PI code PIi extracted from the acquired RDS data is valid for a predetermined number of times (step S9).

If there is no valid PI code for the specified number of times, the process returns to step S2, and the processing from step S2 is executed again. If the PI code determining means 175 determines that the designated number of times is valid, the PI code matching the PI code PIi is stored in the memory 25 (step S1).
0), based on this PI code, the first data creating means 176 converts the RDS data from the AF list and the PTY
Data is created, and the AF list and the PTY data are stored in the memory 25 (step S6).

Therefore, according to the present embodiment, one group of RDS data is acquired, and the PI code of the RDS data under the reception condition in which the SD state during data reception is good is determined as the PI code of the broadcasting station. And the PI code and the P of the group of RDS data received thereafter.
I code and other RD when the same PI data
The AF data, TP data, TA data, and PTY data, which are S data, are fetched to create an AF list, PTY data, and the like. If PI data has not been acquired, the state of the SD during data reception is determined. Monitor the period, determine whether the PI data is valid or invalid based on this SD state,
When valid, PI data is acquired, and based on this PI data, other RDS data, AF data, TP data, T
Since the A data and PTY data are fetched and the AF list and PTY data are created, even if the RDS data of the adjacent interfering station is erroneously fetched first, at this time, the SD data becomes Low. The PI code is not erroneously obtained, and the erroneous FM tuner following operation can be eliminated.

As a result, it is possible to prevent the user from moving to an RDS station different from the RDS station desired by the user due to adjacent interference or the like, prevent creation of an erroneous AF list, and perform a smooth following operation.

[0039]

As described above, according to the present invention, multiplexed data such as RDS data is obtained, and the program identification code of the multiplexed data under the reception condition where the electric field strength state during data reception is good is changed to the broadcasting station. The program identification code is determined, the program identification code is compared with the program identification code of the multiplexed data received thereafter, and when the same program identification data is received, other multiplexed data such as AF data, TP data, TA
Data and PTY data are imported, and AF list and P
Since the TY data or the like is created, it is possible to prevent the user from moving to an RDS station different from the RDS station desired by the user due to adjacent interference or the like, and prevent creation of an erroneous AF list, and also enable a smooth following operation.

Further, according to the present invention, even if the program identification codes do not match, the PS arbitrarily selected from the multiplexed data can be used.
Creation of data including data becomes possible.

According to the present invention, when the program identification data is not acquired, the state of the electric field intensity during data reception is monitored for a predetermined period, and whether the program identification data is valid or invalid is determined based on the electric field intensity state. Judgment is made, and when it is valid, program identification data is obtained, and based on this program identification data, other multiplexed data, AF data, TP data, TA data and P
Since the TY data is fetched and the AF list and the PTY data are created, the R desired by the user due to adjacent interference or the like is generated.
This prevents movement to an RDS station different from the DS station and prevents creation of an erroneous AF list, and also enables smooth follow-up operation.

[Brief description of the drawings]

FIG. 1 shows an RDS to which a receiving device for multiplex broadcasting according to the present invention is applied.
FIG. 3 is a block diagram illustrating a schematic configuration of a receiver.

FIG. 2 is a flowchart showing an operation procedure of the RDS receiver according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a baseband coating structure of RDS data.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Antenna 12 FM tuner 25 Memory (storage means) 17 Microcomputer (control means) 171 Group acquisition determination means 172 PI code acquisition determination means 173 PI code comparison determination means 174 Acquisition period determination means 175 PI code determination means 176 First data creation Means 177 Second data creation means

Claims (3)

[Claims] 1. An FM tuner, which receives a program broadcast and a multiplex broadcast radio wave including multiplex data multiplexed on the program broadcast, and based on an alternative frequency list obtained from the multiplex broadcast. A multiplex broadcast receiving apparatus comprising: control means for causing an FM tuner to follow an alternative station frequency having a good reception condition; and storage means for fetching and storing received multiplexed data. Group acquisition determining means for tuning to a certain broadcasting station to determine whether or not multiplexed data obtained from multiplexed broadcast waves of the broadcasting station has been acquired for a predetermined group; If it is determined that the program identification code has been obtained, whether or not the program identification code has been obtained from the multiplexed data under the reception condition where the electric field strength is good When the program identification code is determined to be acquired by the program identification code acquisition determination means, the acquired program identification code and the program identification code of multiplexed data acquired thereafter are compared. A program identification code comparison / judgment means for comparing and judging whether or not they match each other, and when the program identification code comparison / judgment means judges that they match, based on the matching program identification code,
A first data creating means for creating data including an alternative frequency list from the multiplexed data and storing the data in a storage means. 2. Even if the program identification code comparison / determination means determines that they do not match, second data for creating data including PS data arbitrarily selected from the multiplexed data and storing the data in the storage means. 2. The multiplex broadcast receiving device according to claim 1, further comprising a creating unit. 3. An FM tuner, which receives a program broadcast and a multiplex broadcast radio wave including multiplexed data multiplexed on the program broadcast, based on an alternative frequency list obtained from the multiplex broadcast radio wave. A multiplex broadcast receiving apparatus comprising: control means for causing the FM tuner to follow an alternative station frequency having a good reception condition; and storage means for fetching and storing received multiplexed data, wherein the control means includes: Group acquisition determining means for tuning to a certain broadcasting station to determine whether or not multiplexed data obtained from broadcast waves of the broadcasting station has been acquired for a predetermined group; If it is determined that the program identification code has been obtained, it is determined whether or not the program identification code has been obtained from the A program identification code acquisition determining means for determining, and if the program identification code is determined not to have been obtained by the program identification code obtaining determination means, a reception condition in which the electric field strength is good for a predetermined period during which the multiplexed data can be obtained. Acquisition period determining means for determining whether or not the program identification code is held under a good reception condition; and determining that the program identification code is valid for a predetermined number of times. A program identification code determining means for determining whether there is a program identification code, and when the program identification code determining means determines that the program identification code is valid for a specified number of times, an alternative frequency list is included from the multiplex data based on the program identification code A multiplex broadcast receiving apparatus comprising: a data generating unit that generates data and stores the data in the storage unit.