KR100240426B1 - Signal processor for fm receiver - Google Patents

Abstract

The present invention provides a signal processing apparatus of an FM receiver capable of efficiently receiving FM multiplex broadcasting. The program configuration unit 42 sequentially accumulates the received and demodulated multiple data to form a program. On the other hand, when the received multiplexed data and the previously received multiplexed data have the same service identification code, program number, and page number, the update flag determination section 50 determines whether or not the update flags of the two multiplexed data are identical . When the update flag is the same, the station change permission signal is generated, and thus it is possible to receive multiple data of another FM multiplex broadcasting station in the same multi data transmission period.

Description

Signal processing device of FM receiver

FIG. 1 is a view showing a schematic configuration of a main part of an FM receiver of an embodiment according to the present invention; FIG.

FIG. 2 is a diagram showing a procedure for detecting update data in the embodiment according to the present invention; FIG.

FIG. 3 is a diagram showing a frame configuration of FM multiple data; FIG.

FIG. 4 is a diagram showing a configuration of a data packet of FM multiplex data; FIG.

FIG. 5 is a diagram showing a configuration of a prefix of FM multiple data; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

10: Tuner 12: IF amplification detection circuit

14: MPX 16: Amplifier

18: Speaker 20: Preset key

22: Tune-up microcomputer 40: Data processing section

42: Program constituent section 44: A station program storage section

46: Storage unit for program storage in B station 48: Indicator

50: flag determination unit 52 generated: display RAM switching control unit

The present invention relates to a configuration of an FM receiver and a configuration of a signal processing device used therein, and more particularly to a configuration of an FM receiver having a function of receiving FM multiplex broadcasting in which data such as character information are multiplexed.

Recently, FM multiplex broadcasting in which character information is multiplexed and broadcasted to an FM broadcast has been disclosed. The FM multiplex broadcasting is a multiplexer for encoding character information or the like into digital data of a hierarchical structure and multiplexing the FM stereo signals of an existing FM broadcasting station. The FM multiplexing demodulator demodulates the FM multiplexed data to a conventional FM receiver, The service can be received by adding an indicator to the service. Then, a character program such as news is broadcasted. In addition, review of program broadcast such as useful figure information of traffic system of car and traffic jam information is underway.

However, the FM multiplex broadcasting can be received in a vehicle such as a car or a portable FM receiver. However, since it is difficult to transmit information in the FM multiplex broadcasting standard and a program can be composed from the received multiplex data, Seconds. Therefore, it is desired to efficiently receive the FM multiplex broadcasting.

However, in the FM multiplex broadcasting, for example, in a program such as news or weather forecast, multiple data of the same contents are often repeatedly broadcast. On the other hand, in the case of receiving one broadcasting station, it is impossible to receive FM multiplex broadcasting of another broadcasting station, and there is a problem in that the reception time of a useless period becomes long especially in reception of a program in which data is repeatedly broadcasted.

An object of the present invention is to provide a signal processing apparatus of an FM receiver capable of efficiently receiving FM multiplex broadcasting.

In order to achieve the above object, the signal processing apparatus of the FM receiver of the present invention has the following features.

A signal processing apparatus used in an FM receiver for demodulating and displaying multiplexed data from a received signal of FM multiplex broadcasting, the signal processing apparatus comprising: means for determining whether the data contents of the two multiplexed data are identical to the received multiplexed data and the previously received multiplexed data And to generate a station change permission signal in the same case.

The update judging unit judges whether or not the updated identification codes of the two multiplexed data are identical to each other if the service identification number, the program number and the page number of the two multiplexed data are all identical to the received multiplexed data and the multiplexed data received last time And generates a station change permitting signal when they match.

Further, it is possible to switch between program storage units for program storage in correspondence with the selected broadcasting stations, and program storage units for storing program data from the demodulated multiplexed data, And a switching unit for switching between the first mode and the second mode.

The signal processing apparatus of the FM receiver of the present invention judges whether the contents of the two data are the same for the multiplexed data received and demodulated and the previously received multiplexed data. In the same case, the update decision appraiser generates the station change permission signal, whereby the FM receiver is ready to change the reception station, that is, change the reception frequency. Therefore, if the receiving station is changed based on the generation of the station change permitting signal, the FM multiplex broadcasting of the other broadcasting station can be received during the same data transmission period without repeatedly receiving the same multiplex data, thereby improving the reception efficiency

The determination as to whether the multiple data are identical refers to, for example, a service identification number, a program number, and a page number attached to the FM multiplex data. If they are the same, the update determination unit determines whether or not the update codes attached to the multiple data are the same. If the update codes match, the currently received multiple data is the same as the previous multiple data and generates a station change permission signal.

Further, the program constructing section forms program data from the multiplexed data demodulated and stores the program data in the program storage memory section corresponding to each broadcasting station. By storing the program data of the broadcasting station corresponding to each program storage memory unit as described above, it is possible to store multiple data of a plurality of broadcasting stations that are efficiently received upon reception of a program in which the same data is repeatedly broadcasted.

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

[Overall configuration of FM receiver]

FIG. 1 is a diagram showing a main configuration of an FM receiver of an embodiment.

The broadcast radio waves received by the antenna are supplied to the tuner 10. The tuner 10 mixes the signal of the frequency shifted only 10.7 MHz with respect to the frequency of the desired station to the radio wave received by the antenna and converts the signal of the desired station into an intermediate frequency (IF = 10.7 MHz) and extracts it.

The extracted signal of the desired station is amplified and detected by the IF amplification detection circuit 12 and the detection signal is outputted from the IF amplification detection circuit 12. [

The detection signal outputted from the IF amplification detection circuit 12 is supplied to the MPX 14. The normal FM stereo signal is demodulated by the MPX 14 and output as an L signal and an R signal through the amplifier 16 as a speaker 18, and the speaker 18 outputs stereo audio.

It should be noted that the change of the reception broadcasting station may be performed only when the channel selecting microcomputer 22 automatically changes the reception frequency based on the generation of the station change permission signal from the update flag determination unit 50, All. Then, the tuning microcomputer 22 supplies the tuning data corresponding to the requested broadcasting station to the tuner 10, thereby changing the receiving broadcasting station in the tuner 10. [ The selection of a normal desired broadcast station is carried out by the operator operating the channel preset key 20 as in the conventional FM receiver.

Further, in this embodiment, a band-pass filter 30 (BPF) and an FM multiple decoder 32 for demodulating FM multiplex data at the output side of the IF amplification detection circuit 12, and a data processing unit (40) are provided.

The BPF 30 is a filter for passing a signal of 76 KHz which is the carrier frequency of the FM multiplex data. The BPF 30 extracts a 76 KHz band signal from a detection signal to be output from the IF amplification detection circuit 12 and superimposes the signal on the detection signal by LMSK modulation And extracts the FM multiple data (LMSK signal). The LMSK signal extracted by the BPF 30 is supplied to the FM multiple decoder 32 where it is demodulated into digital data of "1" and "0". The FM multiplex decoder 32 detects a block identification code (BIC) or the like from the demodulated digital data and takes frame synchronization and block synchronization on the basis of the detected code and generates a frame structure of multiple data as shown in FIG. 3 Lt; / RTI >

The reproduced multiple data are sequentially supplied to the data processing unit 40. The data processing unit 40 supplies the obtained multiplexed data to the program configuration unit 42, and the program configuration unit 42 accumulates the multiplexed data to configure the program data. Based on the control of the display RAM switching control section 52, the program data thus configured is selectively transmitted to the program storage sections 44 and 46 (hereinafter, referred to as RAM2 and RAM3) installed for each station (stations A and B) Remember. Under the control of the display RAM switching control section 52, the program data is selectively read from any of the RAM 2 and the RAM 3 and displayed on the display device 48 such as a liquid crystal display. In the figure, the Chinese character font ROM 47 stores a Chinese character font corresponding to a character code and is referred to when character display is performed on the display device 48. [

Furthermore, the data processing section 40 is provided with an update flag determination section 50 which updates the received multiplexed data based on the update code (update flag) attached to the obtained multiplexed data It is determined whether or not it is data, and when it is not update data, a station change permission signal is generated. When the channel selecting microcomputer 22 is connected to the update flag determining section 50 so that the update flag determining section 50 generates the station change permitting signal, the channel selecting change signal is supplied to the channel selecting microcomputer 22.

[Operation of FM receiver]

The FM multiplex data to be multiplexed on the FM stereo signal has a frame configuration of 288 × 272 bits as shown in FIG. 3, for example, in the case of the DARC (data radio channel) standard.

One row (block: 288 bits) of the frame includes a 16-bit block identification code (BIC) and an error correction code (14-bit CRC, 82-bit parity) for error correction of the received data Except that it consists of a 136-bit data packet. The data packet for one block consists of a prefix of 32 bits at the beginning and a data block of 144 bits at the following.

Further, as shown in FIG. 5, the 32-bit prefix includes a 4-bit service identification code indicating the type of service such as characters, figures, traffic information, etc. for the program of FM multiplex broadcasting, An 8-bit program code, and a 6-bit page number, for example.

The detection of the update data in the FM multiplexed data of the above standard is carried out in the procedure as shown in FIG. Hereinafter, this detection procedure will be described using Figs. 1 and 2. Fig.

First, the FM multiplexed data is received (S1), and the multiplexed data is demodulated as described above, and these are sequentially stored in the program configuration unit 42 of the data processing unit 40. [ The program constructing unit 420 compares the service identification (SI) of the previously received multiplexed data stored in the comparison memory (RAM1) provided therein with the SI of the multiplexed data obtained this time to determine whether or not they are the same (S2) .

If it is determined that they are the same SI, the program configuration unit 42 determines whether or not the program numbers of the prefixes of the following FIG. 5 are the same (S3).

S2, or S3, if the SI or the program number of the received multiplexed data is different from the previously received multiplexed data, that is, if it is determined that the received multiplexed data is new multiplexed data, In the comparison memory RAM1 (S5). Furthermore, the program constructing section 42 sequentially accumulates the new multiple data to construct the program data, and transfers the program data to one of the corresponding RAM 2 and RAM 3.

On the other hand, in S2 and S3, if it is determined that the SI and the program number of the received multiplexed data and the SI and program number of the received multiplexed data are the same, the process proceeds to the next step and determines the number of 6-bit page numbers (S4).

When the program configuring unit 42 determines that the page number is 1 and the page number is 1, the update flag determination unit 56 determines whether the update flag of the obtained multiple data Update code) matches the update flag of the multiplexed data received last time (S6). For example, if the update flag of the previous time is "00" and the update flag of the received data is "00", the update flag is "00", "01" The content of the subsequent data block is the same as the previous one.

When it is determined that the update flag is the same as described above, the update flag determination unit 50 generates a station change permission signal, which is supplied to the channel selecting microcomputer 22 so that the reception frequency can be changed (S10).

On the other hand, when it is determined in S6 that the update flag is not the same, the update flag determination unit 50 does not generate the permission signal of the station change (S11), and the received multiplexed data is updated as the update data in the program configuration unit 42 And the program data is configured from the update data (S12).

Similarly, in S7 to S9, the program constructing unit 42 determines whether or not the update flag for the multiple data of each page number = 2 ... N is the same as the received data of the previous page of the same page. The update flag determination unit 50 generates a station change permission signal (S10). If not, the station change permission signal is not generated (S11), and the updated data is sent to the program configuration unit 42 Is stored in the comparison memory (RAM1), and the program data is constructed and transferred to either the RAM 2 or the RAM 3 corresponding thereto.

As described above, when the update flag determination unit 50 generates the station change permission signal as a result of the determination, the channel selecting microcomputer 22 changes the reception frequency in the tuner 10 correspondingly.

For example, when receiving the program of station A, the program data of station A configured in program configuration section 42 is transferred to RAM 2 and stored based on the control of display RAM switching control section 52. Then, the program of the station A obtained in the display device 48 is displayed.

Here, if the received multiplexed data is the same as the already received multiplexed data and the update flag determination unit 50 generates the station change permission signal, the channel preset microcomputer 22 generates the channel preset data of station B in response thereto. As a result, the reception frequency in the tuner 10 is changed from the reception frequency of the station A to the reception frequency of the station B.

After the reception frequency is changed, the FM multiplexed data of the received station B is demodulated and the program data of the station B is configured as the program configuring unit 42. [ At this time, the display RAM switching control section 52 supplies the switching control signal from the RAM 2 to the RAM 3 to the program constituting section 42 based on the generation of the station changing permitting signal, The program data of station B is transmitted to the program storage memory section 42 of station B,

As described above, when FM multiplex broadcasts of other broadcast stations are received during the same multiple data transmission period, a plurality of FM multiplex broadcasts can be tracked as program data in the program storage memory unit in a short time, Each program can be displayed. Therefore, the reception efficiency of the FM multiplex broadcasting is improved.

The update flag is attached to the 32-bit prefix as shown in FIG. 5, and it is possible to determine whether or not the update flag is updated by looking at this prefix. Therefore, in the case of the same data, it is possible to early start to change the receiving frequency of another broadcasting station without processing the multiplexed data in the same receiving frame after that.

In the present embodiment, the determination of the update flag is performed when the same SI, program number, and page number are used. However, there is also a program spread over a plurality of pages depending on the performance of the broadcast program or the FM receiver. Therefore, it is also possible to judge whether or not the update flags are the same for all pages of the program, and to generate the station change permission signal only when the update flags of all the pages are the same.

Further, in the FM multiplex broadcasting, the program number and the page number are attached not only in the prefix (layer 3) but also in the data header (layer 5) attached to the front of the data group data in the data block of the fourth figure. Therefore, the program number and page number of layer 5 may be determined instead of the program number and page number of layer 3 as in the present embodiment.

As described above, according to the signal processing apparatus of the FM receiver of the present invention, when the received multiplexed data has the same contents as the previously received multiplexed data, it detects it and generates a station change permission signal. Then, the change of the station in the FM receiver, that is, the change of the reception frequency is made possible in accordance with the generation of the station change permission signal. Therefore, if the receiving station is changed based on the generation of the station change permission signal, it is possible to receive the multiplexed data of the FM multiplex broadcasting station according to the transmission period of the data, without repeatedly receiving the same multiplex data. This makes it possible to efficiently receive the FM multiplex broadcasting.

The same determination of multiple data refers to, for example, a service identification number, a program number, and a page number attached to FM multiplexed data, and when they are identical, whether or not the update code of the currently received multiplexed data matches the previous one So that it can be easily performed.

In addition, by storing the program data configured in the program-assisted storage unit corresponding to the selected broadcast station, it is possible to store multiple data of a plurality of broadcast stations that are efficiently received upon reception of a program in which the same data is repeatedly broadcasted.

Claims (1)

A signal processing apparatus for an FM receiver for demodulating and displaying multiplexed data from a received signal of FM multiplex broadcasting, the signal processing apparatus comprising: extracting a service identification number, a program number and at least one page number constituting multiplexed data; An update determination unit that compares the service identification number, the program number, and the at least one page number included in the previously received multiplexed data with each other, and outputs a station change permission signal for performing station change when they match; And a plurality of program storage memory units for storing the contents of the program configuration unit in correspondence with the respective broadcasting stations, wherein when the update determination unit does not output the station change permission signal, The update judging section judges whether or not the received multiple data Wherein the control unit causes the contents of the program storage memory unit corresponding to the station change permission signal to be always displayed on the display unit whenever the station change permission signal is output, / RTI >