KR20050067920A - Receive method for disaster broadcasting and urgency in satellite dmb receiver - Google Patents

Abstract

The present invention relates to a DMB, and more particularly to a method for receiving emergency and disaster broadcasts in a satellite DMB receiver. As described above, in the satellite DMB receiver according to the present invention, monitoring the pilot channel of the emergency and disaster broadcast receiver and determining whether there is an alarm in the reserved field of the pilot channel. Receiving emergency and disaster broadcasts.

Description

Receive method for disaster broadcasting and urgency in satellite DMB receiver}

The present invention relates to a DMB receiver, and more particularly, to a method for receiving emergency and disaster broadcasts in a satellite DMB receiver.

The radio broadcast currently in use is an analog form and was originally developed for fixed reception, so that the reception of the sound while walking or driving a vehicle is considerably degraded and requires high power and a wide frequency band.

In order to solve these problems, standardization and commercialization of digital audio broadcasting is underway worldwide.In Europe, which adopts Eureka-147 as the digital audio broadcasting standard, DAB (Digital Audio Broadcasting) in Europe and DAR (Digital Audio Radio) in the US In Canada, Digital Radio Broadcasting (DRB) and Digital Sound Broadcasting (DSB) are used in the International Telecommunication Union (ITU-R), and in Korea, they are used by the Ministry of Information and Communication as DMB (Digital Multimedia Broadcasting). have.

At this time, DAB developed for next-generation broadcasting is able to receive CD-level sound quality in a vehicle that runs at high speed even when transmitted at low power due to strong radio wave environment and noise in downtown. In addition, the concept of 'broadcasting broadcasting' has been expanded to 'looking and listening broadcasting', and in addition to music broadcasting, various multimedia information such as news, traffic information, weather information, geographical location information, video information, etc. Can be transmitted graphically.

Meanwhile, DMB, or digital multimedia broadcasting, named by the Ministry of Information and Communication of Korea, is digitalizing voice broadcasting, and it is 1.5Mbit / s data of high quality CD quality, text, graphics, and moving picture beyond AM and FM radio type. It is the next generation broadcasting that provides various data services that can be transmitted, bidirectionality, and excellent mobile reception quality.

The above-described DMB can be broadly classified into terrestrial DMB and satellite DMB according to the characteristics of a medium, which is a transmission means, and can be divided into fixed service and mobile service in the case of satellite DMB broadcasting.

The characteristics of the DMB are described below by the contents of the European Broadcasting Union (EBU) and ITU-R.

(1) DMB broadcasting should be a digital transmission system that guarantees high quality, and must be continuously acceptable for the next 50 years, and provide high quality sound of 2 channels or more.

(2) It should be able to receive without obstacles in portable and running cars. In other words, mobile, portable and fixed batch reception should be available.

(3) A data channel (PAD: Program Associated Data) that transmits additional information to a regular program or a data channel (NPAD: NonPAD) service as an independent program should be available. In other words, radio, text information and program recognition should be available.

(4) A system with high transmission capacity and transmission efficiency, such as accommodating different data channel capacity and increasing frequency utilization efficiency.

Accordingly, DMB receivers for receiving DMB broadcasts are also in commercialization stage, and products that are embedded in portable devices such as PDAs have been released.

The broadcast CDM channel of the satellite DMB broadcast may be divided into a pilot channel and a broadcast CDM channel, and video, audio, and data are transmitted to the broadcast channel, and the pilot channel delivers configuration information of the broadcast channel.

The CDM channel theoretically has 64 CDM channels, of which 1 pilot channel and 63 broadcast channels.

In general, a satellite DMB receiver may simultaneously receive N (<= 64) CDM channels and select a CDM channel to be received using a Walsh code.

The satellite DMB system is a broadcasting reception area for the whole country and the sea because of the characteristics of broadcasting using satellites.

Therefore, if the satellite DMB system is used for emergency and disaster broadcasting, it can have a good effect.

In general, emergency and disaster broadcasts are transmitted to broadcast channels in the form of data broadcasts, and the receiver delivers emergency and disaster broadcast data received while receiving or waiting to receive video and audio broadcasts.

In addition, in order to receive data broadcast, at least one broadcast channel must be received in addition to the pilot channel even if the receiver is waiting to receive the data broadcast.

As such, home receivers and car receivers are always powered, so you don't have to worry about power consumption.However, if you use a small battery such as a mobile receiver and are always listening to broadcast channels for emergency and disaster broadcast viewing, Significant constraints and a lot of power is wasted.

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and provides an emergency and disaster broadcast reception method in a satellite DMB receiver which minimizes power consumption when watching emergency and disaster broadcasts through a satellite DMB receiver. It is to.

       According to an aspect of the present invention for achieving the above object, the step of monitoring the pilot channel of the receiver to determine the presence or absence of the alarm in the Reserved field of the pilot channel, as a result of the determination, if there is an alarm during emergency and disaster broadcasting Knowing and receiving emergency and disaster broadcasts.

Preferably, as a result of the determination, if there is no alarm, the receiver continuously monitors only the pilot channel.

The presence or absence of the alarm can be known through a bit string of the reserved field.

In addition, the monitoring of the pilot channel is performed during video and audio broadcast reception.

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

First, if the receiver of the satellite DMB receiver is configured to drive only the pilot channel decoder among the N CDM channel decoders and not drive the N-1 broadcast channel decoder, so that only the pilot channel can be driven during reception, If the broadcast channel can be monitored with the power consumption of 1 / N than when the broadcast is received, the emergency and disaster broadcasts can be transmitted using the pilot channel, and the satellite DMB receiver can receive the broadcast channel only when there is emergency and disaster broadcast. Even when waiting for reception, it is possible to prepare for emergency and disaster broadcasting with minimal power consumption.

1 is a diagram illustrating configuration information of a pilot channel among CDM channels of satellite DMB.

Referring to FIG. 1, an interleaver mode specifies an interleave size of a corresponding CDM channel, a convolution mode specifies a coding rate of a convolutional code of a corresponding CDM channel, and TS_ID indicates a corresponding CDM channel. Specifies the transport_stream_id transmitted by this.

Reserved means bit string 000 and PID min indicates the minimum value of the PID range of the TS packet to be transmitted by the corresponding CDM channel. When the same range is allocated to another CDM channel, a plurality of CDM channels are bundled to form a TS.

In addition, the version is incremented by 1 each time the update is made. PID max represents the minimum value of the PID range of the TS packet to be transmitted by the corresponding CDM channel. When the same range is allocated to another CDM channel, a plurality of CDM channels are bundled. It indicates that the TS is configured.

In the present invention, the reserved field is used for the purpose of informing emergency and disaster broadcasting. When there is no emergency and disaster broadcasting, Reserved has a value of bit string 000 and is defined as NO_ALARM.

When there is no emergency and disaster broadcasting, the broadcast transmission system sets the Reserved field to NO_ALARM in the pilot payload of all broadcast CDM channels.

On the other hand, when there is no emergency and disaster broadcasting, Reserved has a value other than bit string 000, which is defined as ALARM, and is indicated by bit string 111, for example.

The broadcast transmission system sets Reserved to ALARM in the pilot payload of the broadcast CDM channel that broadcasts the broadcast when emergency and disaster broadcasts exist. At this time, the emergency and disaster broadcast is transmitted to the corresponding CDM channel.

2 is a flowchart illustrating a method for receiving emergency and disaster broadcasts in the satellite DMB receiver according to the present invention.

Referring to FIG. 2, the receiver receives only the nth pilot channel of the N CDM channels while waiting for reception (S11).

For reference, the CDM channel theoretically has 64 (N) channels, one of the 64 channels (nth) is a pilot channel, and 63 delivers video, audio, and data through a broadcast channel.

Subsequently, it is checked whether there is information in a field indicating that emergency and disaster broadcasting is on a pilot (nth CDM) channel while waiting for reception (S12).

As a result of the check (S12), if Reserved which is a field of the nth CDM (pilot) channel configuration information is ALARM, the receiver receives emergency and disaster broadcasts on the nth broadcast channel carrying emergency and disaster broadcasts instead of the pilot channel ( S13)

On the other hand, if the check result (S12), Reserved which is a field of the n-th CDM (pilot) channel configuration information is NO_ALARM, it is determined that there is no emergency and disaster broadcast (S15), and the process waits for reception.

As described above, the reception unit drives only the pilot channel decoder while not receiving the broadcast channel decoder.

If there is information indicating that emergency and disaster broadcasting is on the pilot channel even during video and audio broadcasting, that is, if Reserved, which is a field indicating that emergency and disaster broadcasting is in the nth CDM channel configuration information, is ALARM, the receiver is in emergency and disaster broadcasting. Receive on the channel.

As described above, the present invention has an effect of minimizing power consumption if the configuration can control the operation of the CDM channel decoder of the receiver in receiving emergency and disaster broadcasts.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

1 is a diagram illustrating configuration information of a pilot channel among CDM channels of satellite DMB.

2 is a flowchart illustrating a method for receiving emergency and disaster broadcasts in a satellite DMB receiver according to the present invention.

Claims (4)

        Monitoring the pilot channel of the receiver to determine the presence or absence of an alarm in the Reserved field of the pilot channel;         In response to the determination, if there is an alarm, the emergency and disaster broadcast receiving method, the emergency and disaster broadcast receiving method comprising the step of receiving an emergency and disaster broadcast. The method of claim 1, The emergency and disaster broadcast reception method in the satellite DMB receiver, characterized in that the receiver continues to monitor the pilot channel if there is no alarm as a result of the determination. The method of claim 1, The presence or absence of the alarm can be known through the bit string of the reserved field emergency and disaster broadcast reception method in a satellite DMB receiver. The method of claim 1, Monitoring of the pilot channel is an emergency and disaster broadcast reception method in the satellite DMB receiver, characterized in that also during the reception of video and audio broadcast.