KR100754985B1 - Dmb receiver using active antenna - Google Patents

Abstract

A DMB(Digital Multimedia Broadcasting) receiver employing an active antenna is provided to prevent an antenna from being broken by a surrounding environment by using the active antenna in the DMB receiver. An active antenna includes a power supply part having a power noise removal unit. A DMB reception board is installed on a PCB(Printed Circuit Board). The DMB reception board includes an RF(Radio Frequency) tuner for selecting a channel from a signal received by the active antenna and having a large ground area, an A/D(Analog to Digital) conversion part for converting a broadcasting signal selected by the RF tuner into a digital signal, a demodulation part for demodulating an output of the A/D conversion part, a decoder for decoding an output of the demodulation part, and an interface part for transmitting an output of the decoder which is adapted to a data transmission format and receiving a user instruction from an external device, and a control part for performing control operations according to the user instruction. The interface part is connected and removed directly or via an additional connector to/from an external device.

Description

DMB Receiver Using Active Antenna

1 is a block diagram schematically showing a configuration of a conventional DMB receiver.

Figure 2 is a perspective view showing one embodiment of a conventional DMB receiver.

Figure 3 is a block diagram schematically showing the configuration of a DMB receiver using an active antenna according to the present invention.

4 is a circuit diagram showing a configuration of a power supply unit for supplying power to an active antenna of the DMB receiver of FIG.

5 is a perspective view showing an embodiment of a DMB receiver using an active antenna according to the present invention;

<Description of the code for the main part of the drawing>

10: load antenna 20,40: DMB receiving board

21,41: RF tuner 22,42: A / D converter

23,43: decoder 24,44: demodulator

26,45 interface 25,46 control unit

27: Case 28: USB connector

30: active antenna 31: power supply

A: RF tuner part B: Digital part

b: Bead f: EMI Filter

t: tantalum

The present invention relates to a DMB receiver for receiving and viewing DMB broadcasts using a PC or a notebook. In particular, an active antenna is used to receive DMB broadcast waves, and noise on a receiver board is used to use the active antenna. It provides a DMB receiver using an active antenna that is compact and its size is made easy to carry and install by improving reception sensitivity while eliminating it.

Currently, standardization and commercialization of digital audio broadcasting is in progress worldwide, and a digital broadcasting service called DMB (Digital Multimedia Broadcasting) has been launched in Korea. The digital multimedia broadcasting is capable of transmitting data of high quality CD level, text, graphics, moving picture, etc. beyond the previous AM and FM radio types as the digitalization of voice broadcasting is performed. Various data services, two-way data, excellent mobile reception quality, etc. It is the next generation broadcast to provide.

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

The characteristics of the DMB should be a digital transmission method that guarantees high quality, and must be continuously acceptable for the next 50 years, and provide high quality sound of two channels or more. In addition, it should be possible to receive without obstacles in portable use or in a running car, and should be able to provide data channel service as an independent program or a data channel for transmitting additional information to a regular program. In addition, it should be a system having high transmission capacity and transmission efficiency by accommodating different data channels and increasing frequency utilization efficiency.

As a device capable of realizing all of the characteristics of the DMB broadcast, DMB receiver products that can be attached to and detached from portable communication devices such as PCs, PDAs, and mobile phones have been released.

As shown in FIG. 1, the DMB receiver includes: an antenna (10) for receiving a DMB broadcast signal; RF tuner 21 for tuning from the DMB signal received from the antenna, an A / D converter 22 for digital conversion of the broadcast signal tuned in the RF tuner 21, and the A / D conversion. A demodulator 23 for demodulating a negative output, a decoder 24 for decoding the output of the demodulator 23, and a removable / detachable device via a connector directly or separate from an external device. Control unit for controlling the entire configuration according to the user command input through the interface unit 26 and the interface unit 26 for transmitting the output of the output according to the data transmission format and receiving a user command from an external device It consists of a DMB receiving board 20 is installed 25.

In addition, Figure 2 is an embodiment of the DMB receiver having the configuration shown in Figure 1 as the antenna 10 used to pull up to a certain height, the case 27 with a built-in DMB receiving board, and the USB connected to the interface unit It is composed of a connection terminal 28.

As described above, since the frequency of the channel allocated for the terrestrial DMB is 204-210 MHz, the DMB receiver uses a load antenna having a length of 35 cm due to RF characteristics, or a length of about 12 cm that has improved reception sensitivity than the load antenna. A passive pattern antenna having a was used.

However, since the passive pattern antenna or the rod antenna is installed at one side of the DMB receiver and must be pulled up to have an original length when it is connected to a PC or a laptop, in a narrow space, the length of the antenna interferes with other people or causes damage to other objects. There was a problem that the antenna may be damaged by a bump.

In addition, in order to solve the above problems, the use of a small active antenna is proposed, but since the active antenna needs to supply a separate power source, noise generated during the power supply process and noise generated on the receiver board There was a problem that was not used at all because it did not solve the problem.

Accordingly, the present invention solves the noise that may occur in the power supply process to the active antenna while using the active antenna to solve the above problems, and removes the noise generated in the receiver board by increasing the ground area on the receiver board At the same time, the purpose of the antenna is to improve the reception sensitivity even when using an active antenna.

In addition, by using the active antenna to compactly configure the size of the DMB receiver is another object to make it easy to carry and not to be affected by space or the surrounding environment during installation.

In addition, by installing the active antenna to fold and unfold on the receiver board or the built-in case is another object to minimize the size when not in use to facilitate portability.

In order to achieve the above object, the present invention provides a DMB receiver comprising: an active antenna having a power supply unit having power noise canceling means; An RF tuner tuned to a channel from the signal received from the active antenna and having a large ground, an A / D converter for digital conversion of the broadcast signal tuned by the RF tuner, and an output of the A / D converter. A demodulator for demodulation, a decoder for decoding the output of the demodulator, and can be attached / removed directly or through a separate connector with an external device, and transmits the output of the decoder to match the data transmission format, It provides a DMB receiver using an active antenna comprising an interface unit for receiving a user command and a control unit for controlling the entire configuration according to the user command input through the interface unit.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 shows a configuration of a DMB receiver using an active antenna according to the present invention, comprising: an active antenna 30 having a power supply unit 31 having power noise removing means; An RF tuner 41 which tunes a channel from the DMB signal received from the active antenna 30 and has a large area of ground, and an A / D converter for digital conversion of the broadcast signal tuned by the RF tuner 41. (42), a demodulator 43 for demodulating the output of the A / D converter 42, a decoder 44 for decoding the output of the demodulator 43, and an external device directly or A user input through the interface unit 45 and the interface unit 45 for attaching / detaching through a separate connector and transmitting the output of the decoder to match the data transmission format and receiving a user command from an external device. The control unit 46 for controlling the entire configuration in accordance with the command is composed of a DMB receiving board 40 mounted.

The active antenna 30 typically has a length of about 8.5 cm, a power supply unit 31 is installed to receive power, and an amplifier for amplifying the received signal.

As shown in FIG. 4, the power supply unit 31 is typically supplied with 3.3 V of power, and means for removing power noise generated by the power supplied from the power supply source is connected in series with beads (b, Bead). ) And an EMI filter (f), and tantalum (t) connected in parallel with the bead (b) and grounded, and the power passing through the EMI filter (f) is supplied to the active antenna. The beads are used for EMI high frequency attenuation as ferrite beads, and are mounted on a substrate in a mountable chip type. In addition, the EMI filter is composed of three terminals, the middle terminal is a common GND terminal, and most of them are composed of L, C, L filter to filter the band of a certain section such as high frequency or low frequency. In addition, the tantalum represents a tantalum condenser, and the tantalum electrolytic capacitor is superior to the aluminum electrolytic capacitor in all respects including electrical characteristics. Therefore, the power noise generated from the power supplied to drive the active antenna is removed by the beads (b), the EMI filter (f) and tantalum (t).

In addition, a DMB on which an RF tuner, an A / D converter, a demodulator, a decoder, an interface unit, and a controller are mounted to demodulate the amplified DMB signal received by the active antenna so that the DMB broadcast can be viewed through a PC or a notebook. The receiver board uses a four-layer PCB. The PCB substrate of the four-layer structure is divided into an RF tuner unit for installing an RF tuner and a digital unit B for installing the remaining A / D converter, demodulator, decoder, interface unit, and control unit. The components mounted in the digital part B can be minimized by mounting a plurality of components in a small area by using the entire four-layer structure. However, although the RF tuner unit A is a four-layer PCB, the RF tuner and all data lines are installed only on the upper layer of the RF tuner unit A, and the remaining layers are used as grounds of the RF tuner. Have it. At this time, the area of the ground is designed to be a large area in consideration of the installation position of the components in the design process of the PCB substrate, and accordingly to have a large area of ground by manufacturing the PCB substrate. In addition, shielding is performed for each data line to remove noise generated from the data lines connecting each component.

As described above, the area of the ground is increased by applying the entire board to the total ground using the double-sided board design to the position of the RF tuner on the DMB receiver board, thereby reducing the noise generated on the board. In addition, it is possible to replace the function of the antenna according to the characteristics of the 200MHz band, the frequency allocated for the DMB can significantly improve the reception sensitivity.

Next, Figure 5 shows an embodiment of a DMB receiver using an active antenna according to the present invention, the case 50 is provided with an interface that can be connected to a USB terminal of a PC or laptop on one side and a built-in DMB receiver board And, provided on the other side of the case 50 is composed of an active antenna 30 that can be folded and unfolded by the rotation means 51, such as a hinge. In addition, depending on the type of interface of the DMB receiver, it may be directly connected to a PC or a notebook, or connected using a separate data cable.

When the DMB receiver configured as described above is connected to a PC or a notebook, the active antenna stands up, and when not in use, the DMB receiver can be formed in a compact size by folding the active antenna into close contact with the case.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but it is only for the purpose of illustrating the invention, and those skilled in the art to which the present invention pertains various modifications or equivalents from the detailed description of the invention. It will be appreciated that one embodiment is possible. Therefore, the true scope of the present invention should be determined by the technical spirit of the claims.

As described above, according to the present invention, the DMB receiver can be free from the influence of the surrounding environment when using the active antenna, and can prevent the antenna from being damaged by the surrounding environment, and can be easily carried by compactly configuring the size. have.

In addition, the reception sensitivity of the active antenna can be greatly improved by removing power noise and noise on the receiver board generated by using the active antenna, thereby enabling the active antenna to be used in a DMB receiver.

In addition, the size of the active antenna can be minimized during installation and portability by allowing the receiver antenna to be installed and folded on one side of the case in which the receiver board is built.

Claims (6)

In the DMB receiver, An active antenna having a power supply having power noise canceling means; An RF tuner tuned to a channel from the signal received from the active antenna and having a large ground, an A / D converter for digital conversion of the broadcast signal tuned by the RF tuner, and an output of the A / D converter. A demodulator for demodulating, a decoder for decoding the output of the demodulator, and a removable device, directly or separately from an external device, and transmitting the output of the decoder so as to conform to the data transmission format. Interface unit for receiving a user command and the control unit for controlling the entire configuration according to the user command input through the interface unit using an active antenna, characterized in that it comprises a DMB receiving board mounted on a four-layer PCB board DMB receiver The method of claim 1, The power supply unit, Bead and EMI filters in series with the power source, And a tantalum connected in parallel with the bead and grounded. delete The method of claim 1, The PCB substrate, An RF tuner unit in which the RF tuner is mounted; The A / D converter, the decoder, the demodulator, the interface, and the controller are formed by dividing the digital unit, The RF tuner unit has an RF tuner and a data line mounted on the upper layer, and the remaining layer is used as a ground to form a two-layer structure having a large area of ground. The digital unit is a DMB receiver using an active antenna, characterized in that for mounting the components using the entire four-layer structure. The method of claim 1, DMB receiver using an active antenna, characterized in that the data line connecting the components of the DMB receiving board is shielded. A case having a built-in DMB receiving board of claim 1; DMB receiver using an active antenna, characterized in that consisting of an active antenna installed to be folded by the rotating means on one side of the case.

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