KR20150044347A - Digital audio broadcasting apparatus and method thereof - Google Patents

Digital audio broadcasting apparatus and method thereof Download PDF

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Publication number
KR20150044347A
KR20150044347A KR20130123651A KR20130123651A KR20150044347A KR 20150044347 A KR20150044347 A KR 20150044347A KR 20130123651 A KR20130123651 A KR 20130123651A KR 20130123651 A KR20130123651 A KR 20130123651A KR 20150044347 A KR20150044347 A KR 20150044347A
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KR
South Korea
Prior art keywords
broadcast
code
signal
local
dab
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KR20130123651A
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Korean (ko)
Inventor
이원영
Original Assignee
현대모비스 주식회사
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Priority to KR20130123651A priority Critical patent/KR20150044347A/en
Publication of KR20150044347A publication Critical patent/KR20150044347A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/37—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying segments of broadcast information, e.g. scenes or extracting programme ID
    • H04H60/372—Programme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Abstract

The present invention relates to a digital audio broadcasting (DAB) device. The digital audio broadcasting device includes: a frequency modulation (FM) module receiving FM signals; a DAB module receiving DAB signals; an output unit which outputs broadcast signals based on the FM and DAB signals; and a central control unit which controls the DAB device to output the broadcast signals based on either of the FM or DAB signals based on the DAB signal reception conditions. The central control unit controls the DAB device to output the broadcast signals based on the FM signal when the reception strength of the DAB signals is lower than a reference value.

Description

[0001] DIGITAL AUDIO BROADCASTING APPARATUS AND METHOD THEREOF [0002]

The present invention relates to a digital audio broadcasting apparatus and a method thereof, and more particularly, to a digital audio broadcasting apparatus and a method thereof for receiving an FM signal in a case where a reception state of a DAB signal is poor, will be.

DAB (Digital Audio Broadcasting) refers to audio broadcasting capable of transmitting high-quality sound, text, and graphics at the same level as a compact disc (CD) using terrestrial waves. Generally, it refers to terrestrial broadcasting, It also includes a satellite DAB that uses multimedia broadcasting at the same time.

DAB refers to an audio broadcast that can transmit not only high-quality voice at the compact disc level but also characters, graphics, and moving pictures beyond simple audio services such as conventional AM (Amplitude Modulation) broadcasting and FM (Frequency Modulation) broadcasting.

Terrestrial DAB has already become a standardized service in Europe and the United States, the United States has chosen the In Band On Channel (IBOC) and Europe has chosen the Eureka 147 as the out-of- Service.

The difference between the US and European systems is that the US DAB converts analogue broadcasting to digital and simultaneously performs analog broadcasting and digital broadcasting, while DAB in Europe is a new system in which new operators and existing operators enter the DAB market It is a new service.

DAB can provide various multimedia information services at low price, can be used for mobile broadcasting according to frequency band allocation, can generate new revenue source through additional data transmission service, It has the advantage of being able to achieve industrial effect.

Prior art relating to the present invention is disclosed in Korean Patent Laid-open Publication No. 10-2003-0025603 (published on Mar. 29, 2003, entitled "Analog and Digital Broadcasting Composite Receiver and Receiving Method").

In DAB broadcasting, information is provided to enable interworking with existing FM broadcasting, which is called FM Hard Link.

Therefore, when the reception status of the currently received DAB broadcast is deteriorated by using the FM Hard Link information, it is possible to switch to an FM broadcast outputting the same broadcast to enable broadcast listening, which is called a service following function.

Specifically, if the service following function is examined, the PI (Program Identification) code of the corresponding FM broadcast is extracted from the received FM signal, and compared with the PI code included in the FM Hard Link of the DAB signal, And outputs the broadcast, so that the same broadcast can be continuously listened to.

At this time, if the FM broadcasting is changed to a local broadcasting or only the local FM broadcasting can be received, the PI code is changed in the corresponding area, so that unexpected broadcasting is outputted when the FM signal of the broadcasting station having the existing PI code is received There was a problem.

That is, in the case of the local broadcasting, since the 4-bit information corresponding to the area code information is different from the 16-bit PI code, there is a problem that the broadcasting can not be switched according to the PI code of the central FM broadcast obtained in the past.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a digital audio broadcasting apparatus and method for receiving an FM signal in a case where a DAB signal is poorly received, have.

According to an aspect of the present invention, there is provided a digital audio broadcasting apparatus including: a frequency modulation module for receiving an FM (Frequency Modulation) signal; A digital audio broadcasting module for receiving a DAB (Digital Audio Broadcasting) signal; An output unit for outputting a broadcast based on the FM signal or the DAB signal; And a central control unit for controlling to output a broadcast based on one of the FM signal and the DAB signal according to a reception state of the DAB signal, wherein the central control unit, when the reception intensity of the DAB signal is less than a reference value, And outputting a broadcast based on the broadcast signal.

The present invention further includes a memory unit for storing a first PI (Program Identification) code of an FM broadcast switchable from the DAB signal and a second PI code of a local FM broadcast outputting the same broadcast as the switchable FM broadcast, And the control unit controls to output the broadcast based on the FM signal received from the broadcasting station corresponding to the first PI code or the second PI code.

In the present invention, the central control unit scans the entire frequency of the FM broadcast through the frequency modulation module, extracts the PI code of each FM broadcast, determines whether the same PI code as the first PI code exists among the extracted PI codes, It is determined whether a PI code corresponding to a local FM broadcast exists in the extracted PI code, and a PI code corresponding to the local FM broadcast is stored in the memory unit with a second PI code.

In the present invention, the central control unit extracts all the frequency lists of the FM broadcast, determines whether a frequency corresponding to the PI code corresponding to the local FM broadcast is present in the extracted frequency list, and outputs a PI code corresponding to the local FM broadcast And the second PI code is stored in the memory unit.

In the present invention, the output unit may include a DSP (Digital Signal Processor), an AMP (Amplifier), and a speaker.

According to another aspect of the present invention, there is provided a digital audio broadcasting method including: receiving a DAB (Digital Audio Broadcasting) signal by a central control unit; Extracting a first Program Identification (PI) code of an FM broadcast switchable from the DAB signal and storing the extracted first program identification code in a memory; Storing a second PI code of a local FM broadcast outputting the same broadcast as the switchable FM broadcast in a memory unit; Outputting a DAB broadcast based on the DAB signal; And switching the broadcast signal based on the FM signal of the broadcasting station corresponding to the first PI code or the second PI code if the reception intensity of the DAB signal is lower than a reference value.

The step of storing the second PI code of the local FM broadcast outputting the same broadcast as that of the switchable FM broadcast in the present invention comprises the steps of: scanning the entire frequency of the FM broadcast and extracting the PI code of each FM broadcast; Determining whether a PI code identical to the first PI code exists among the extracted PI codes; Determining whether a PI code corresponding to a local FM broadcast exists among the extracted PI codes if the same PI code exists as the first PI code; And storing the PI code corresponding to the local FM broadcast in the memory unit with the second PI code if the PI code corresponding to the local FM broadcast exists.

The step of storing the second PI code of the local FM broadcast outputting the same broadcast as the switchable FM broadcast in the present invention comprises the steps of: extracting all the frequency lists of the FM broadcast; Determining whether a frequency corresponding to a PI code corresponding to a local FM broadcast exists in the extracted frequency list; And storing a PI code corresponding to the local FM broadcast in a memory unit with a second PI code if a frequency corresponding to the PI code corresponding to the local FM broadcast is present.

According to the present invention, when the reception state of the DAB signal is poor, the FM signal for outputting the same broadcast is received so that the broadcast can be output without interruption.

In the present invention, the PI code corresponding to the local FM broadcasting is stored in advance, and when the FM broadcasting is moved to the area where the FM broadcasting is received, the broadcasting is switched to the local broadcasting using the stored PI code, Do.

1 is a functional block diagram of a digital audio broadcasting apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating an exemplary implementation of a digital audio broadcasting method according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a process of additionally storing a PI code of a local FM broadcast mixed with a central FM broadcast according to an embodiment of the present invention.
4 is a flowchart illustrating a process of storing a PI code of a local FM broadcast when only local FM broadcasts can be received according to an embodiment of the present invention.

Hereinafter, a digital audio broadcasting apparatus and method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a functional block diagram of a digital audio broadcasting apparatus according to an embodiment of the present invention.

1, a digital audio broadcasting apparatus according to an embodiment of the present invention includes a frequency modulation module 100, a digital audio broadcasting (DAB) module 200, a central control unit 300, an output unit 400, (500).

The frequency modulation (FM) module 100 receives an FM (Frequency Modulation) signal and transmits it to the central control unit 300 and the output unit 400.

At this time, the frequency modulation module 100 receives not only the FM signal but also a PI (Program Identification) code indicating an identification code relating to the location of the broadcasting station and the broadcasting station name in the Radio Data System (RDS).

Therefore, the central control unit 300 can distinguish which FM signal is transmitted to which broadcasting station through the signal received from the frequency modulation module 100.

The digital audio broadcasting module 200 receives a digital audio broadcasting (DAB) signal and transmits the digital audio broadcasting signal to the central control unit 300 and the output unit 400.

At this time, the digital audio broadcasting module 200 receives not only the DAB signal but also the PI code of the FM broadcasting which can be switched from the corresponding DAB signal.

Since the specific broadcasting is not possible only by the DAB signal, the FM broadcasting is performed simultaneously during the DAB broadcasting.

Since DAB broadcasting has many weak electric fields or inferior areas compared to FM broadcasting, the present embodiment outputs broadcasting based on the FM signal in accordance with the reception state of the DAB signal.

Therefore, when receiving the DAB signal, the digital audio broadcasting module 200 receives the PI code of the FM broadcasting which can be switched from the DAB signal, and thereby, based on the received PI code when the reception state of the corresponding DAB signal is poor FM broadcasting can be output.

In this embodiment, the PI code of the FM broadcast which can be switched from the DAB signal is referred to as a first PI code.

The central control unit 300 outputs a DAB broadcast through the DAB signal received through the digital audio broadcasting module 200. When the reception state of the received DAB signal is poor, the central control unit 300 receives an FM signal for performing the same broadcasting, Based broadcasting and outputs the converted broadcast.

However, when the FM broadcasting is changed to the local FM broadcasting or only the local FM broadcasting is available, the PI code of the broadcasting station outputting the broadcasting signal differs. Therefore, when receiving the signal of the broadcasting station corresponding to the existing PI code, It is possible to switch to an FM broadcast which does not.

Accordingly, the central control unit 300 according to the present embodiment pre-extracts the PI code of the local FM broadcast outputting the same broadcast as the FM broadcast switchable from the DAB signal, and stores the extracted PI code in the memory unit 500.

In the present embodiment, the PI code of the local FM broadcast that outputs the same broadcast as the FM broadcast switchable from the DAB signal will be referred to as a second PI code.

Specifically, when extracting the second PI code, when the central FM broadcast and the local FM broadcast coexist, the central control unit 300 scans the entire frequency of the FM broadcast through the frequency modulation module 100, Extract the PI code.

Then, it is determined whether the same PI code as the first PI code exists among the extracted PI codes. That is, since the first PI code is the PI code of the broadcasting station outputting the FM broadcasting switchable from the currently broadcast DAB signal, if the extracted PI code is the same as the first PI code, it means that there is a broadcasting station capable of outputting the same broadcasting .

Subsequently, the central control unit 300 determines whether a PI code corresponding to the local FM broadcast exists among the extracted PI codes. Specifically, since the PI code corresponding to the local FM broadcast is different from the PI code of the central FM broadcast and the 4-bit indicating the area code, it can be judged that the corresponding area code bit is compared.

If the remaining 12 bits are the same except for 4 bits indicating the area code, the PI code corresponding to the local FM broadcast exists. Therefore, this corresponds to the case where the central FM broadcast and the local FM broadcast which can be switched from the DAB signal are mixed.

Therefore, in the present embodiment, if there is a PI code corresponding to a local FM broadcast, the central control unit 300 stores the corresponding PI code in the memory unit 500 with the second PI code, Create an environment.

On the other hand, when extracting the second PI code, when there is only the local FM broadcast, the central control unit 300 extracts all the frequency lists of the FM broadcasts, extracts all the frequency lists corresponding to the PI codes corresponding to the local FM broadcasts It is determined whether or not the frequency exists.

If there is a frequency corresponding to the PI code corresponding to the local FM broadcast, the central control unit 300 stores the PI code corresponding to the local FM broadcast in the memory unit 500 as the second PI code.

The output unit 400 outputs a broadcast based on an FM signal or a DAB signal under the control of the central control unit 300 and includes a DSP 420, an AMP 440, and a speaker 460.

That is, the signal received from the frequency modulation module 100 or the digital audio broadcasting module 200 is processed by the DSP 420, converted into an amplified signal by the AMP 440, .

As described above, the central control unit 300 controls to output a broadcast based on the DAB signal when the reception state of the DAB signal is good, and controls to output a broadcast based on the FM signal when the reception state of the DAB signal is poor.

Specifically, when the reception state of the DAB signal is poor, the central control unit 300 switches the broadcasting based on the FM signal of the broadcasting station having the first PI code or the second PI code stored in the memory unit 500 and outputs the broadcast.

That is, when reception of the central FM signal is possible, the broadcast based on the FM signal of the broadcasting station having the first PI code is output. When the local FM signal is changed or only the local FM signal is received, And outputs a broadcast based on the signal.

At this time, when the reception state of the DAB signal is poor, it can be set to a case where the reception intensity of the DAB signal is less than the reference value, and the reference value means a weak reception intensity to which normal broadcasting is impossible.

As described above, in this embodiment, not only the broadcast based on the FM signal is output according to the reception state of the DAB signal, but also the second PI code of the local FM broadcast is stored in advance in the memory unit 500, It is possible to continue outputting the existing broadcast even if the mobile terminal is moved to the position where only the received broadcast is received.

The memory unit 500 stores the first PI code of the FM broadcast switchable from the DAB signal and the second PI code of the local FM broadcast outputting the same broadcast as the switchable FM broadcast.

2 is a flowchart illustrating an exemplary implementation of a digital audio broadcasting method according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating a process of additionally storing a PI code of a local FM broadcast mixed with a central FM broadcast according to an embodiment of the present invention.

4 is a flowchart illustrating a process of storing a PI code of a local FM broadcast when only local FM broadcasts can be received according to an embodiment of the present invention.

Referring to FIGS. 2 to 4, a digital audio broadcasting method according to an exemplary embodiment of the present invention will be described. First, the central control unit 300 receives a DAB signal through the digital audio broadcasting module 200 (S100).

Then, the central control unit 300 extracts the first PI code of the FM broadcast switchable from the received DAB signal and stores it in the memory unit 500 (S200).

Subsequently, the central control unit 300 stores the second PI code of the local FM broadcast outputting the same broadcast as the switchable FM broadcast in the memory unit 500 (S300).

At this time, the central FM signal and the local FM signal may be received at the same time, and only the local FM signal may be received.

Referring to FIG. 3, the process of storing the PI code of the local FM broadcast mixed with the central FM broadcast will be described. The central control unit 300 scans the entire frequency of the FM broadcast through the frequency modulation module 100 S310), and the PI code of each FM broadcast is extracted (S330).

Subsequently, the central control unit 300 determines whether the extracted PI code exists in the first PI code (S350). If there is the same PI code as the first PI code, the central controller 300 determines whether a PI code corresponding to the local FM broadcast exists (S370).

If there is a PI code corresponding to the local FM broadcast, the central control unit 300 stores the corresponding PI code in the memory unit 500 with the second PI code (S390).

Referring to FIG. 4, the process of storing the PI code of the local FM broadcast when only the local FM broadcast is receivable will be described. The central control unit 300 extracts all the frequency lists of the FM broadcast (S320) It is determined whether there is a frequency corresponding to the PI code corresponding to the local FM broadcast (S340).

If there is a PI code corresponding to the local FM broadcast, the PI code is stored in the memory unit 500 with the second PI code (S360).

After storing the second PI code in the memory unit 500 through the above-described process (S300), the central control unit 300 outputs the DAB broadcast through the output unit 400 based on the received DAB signal (S400) , And if the reception intensity of the DAB signal falls below the reference value (S500), control is performed so as to switch to broadcast based on the FM signal and output (S600).

In the above-described process (S600), the central control unit 300 controls to switch to the broadcast based on the FM signal of the broadcasting station having the first PI code or the second PI code stored in the memory unit 500 and output it.

Specifically, when reception of the central FM signal is possible, a broadcast based on the FM signal of the broadcasting station having the first PI code is output. If the local FM signal is changed or only the local FM signal is received, the broadcasting station having the second PI code And outputs a broadcast based on the FM signal.

According to this embodiment, when the reception state of the DAB signal is poor, the FM signal for outputting the same broadcast is received, so that the broadcast can be outputted without interruption.

In this embodiment, the PI code corresponding to the local FM broadcast is stored in advance, and when the FM radio broadcast is moved to the area where the local FM broadcast is received, the local broadcast is output using the stored PI code, It is possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

100: frequency modulation module
200: Digital audio broadcasting module
300:
400: Output section
420: DSP
440: AMP
460: Speaker
500: memory unit

Claims (8)

A frequency modulation module for receiving an FM (Frequency Modulation) signal;
A digital audio broadcasting module for receiving a DAB (Digital Audio Broadcasting) signal;
An output unit for outputting a broadcast based on the FM signal or the DAB signal; And
And a central controller for controlling to output a broadcast based on one of the FM signal and the DAB signal according to a reception state of the DAB signal, And outputs the broadcast based on the broadcast signal.
The method according to claim 1,
Further comprising a memory unit for storing a first PI (Program Identification) code of an FM broadcast switchable from the DAB signal and a second PI code of a local FM broadcast outputting the same broadcast as the switchable FM broadcast, And outputs the broadcast based on the FM signal received from the broadcasting station corresponding to the first PI code or the second PI code.
3. The method of claim 2,
The central control unit scans the entire frequency of the FM broadcast through the frequency modulation module, extracts the PI code of each FM broadcast, determines whether the same PI code as the first PI code exists among the extracted PI codes, And the PI code corresponding to the local FM broadcast is stored in the memory unit with the second PI code.
3. The method of claim 2,
The central control unit extracts all the frequency lists of the FM broadcasts, determines whether a frequency corresponding to the PI code corresponding to the local FM broadcast exists in the extracted frequency list, and transmits the PI code corresponding to the local FM broadcast to the second PI code In the memory unit.
The method according to claim 1,
Wherein the output unit includes a DSP (Digital Signal Processor), an AMP (Amplifier), and a speaker.
Receiving a DAB (Digital Audio Broadcasting) signal from a central control unit;
Extracting a first Program Identification (PI) code of an FM broadcast switchable from the DAB signal and storing the extracted first program identification code in a memory;
Storing a second PI code of a local FM broadcast outputting the same broadcast as the switchable FM broadcast in a memory unit;
Outputting a DAB broadcast based on the DAB signal; And
When the reception intensity of the DAB signal is lower than a reference value, switching to a broadcasting based on the FM signal of the broadcasting station corresponding to the first PI code or the second PI code and outputting
Lt; / RTI >
The method according to claim 6,
The step of storing the second PI code of the local FM broadcast outputting the same broadcast as the switchable FM broadcast in the memory unit includes the steps of: scanning the entire frequency of the FM broadcast and extracting the PI code of each FM broadcast;
Determining whether a PI code identical to the first PI code exists among the extracted PI codes;
Determining whether a PI code corresponding to a local FM broadcast exists among the extracted PI codes if the same PI code exists as the first PI code; And
If there is a PI code corresponding to the local FM broadcast, storing the PI code corresponding to the local FM broadcast in the memory unit with the second PI code
Wherein the digital audio broadcasting method comprises the steps of:
The method according to claim 6,
Storing the second PI code of the local FM broadcast outputting the same broadcast as the switchable FM broadcast in the memory unit includes: extracting all the frequency lists of the FM broadcast;
Determining whether a frequency corresponding to a PI code corresponding to a local FM broadcast exists in the extracted frequency list; And
If there is a frequency corresponding to the PI code corresponding to the local FM broadcast, storing the PI code corresponding to the local FM broadcast in the memory unit with the second PI code
Wherein the digital audio broadcasting method comprises the steps of:
KR20130123651A 2013-10-16 2013-10-16 Digital audio broadcasting apparatus and method thereof KR20150044347A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102244151B1 (en) * 2021-01-04 2021-04-23 주식회사 알에프투디지털 Audio signal synchronization method of multiple radio standards

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102244151B1 (en) * 2021-01-04 2021-04-23 주식회사 알에프투디지털 Audio signal synchronization method of multiple radio standards

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