KR100512943B1 - Satellite Broadcast receiver and a method Satellite Broadcast receiving thereof - Google Patents

Abstract

Disclosed are a satellite broadcast receiver and a satellite broadcast receiving method thereof, which aims to reduce hardware and reduce power consumption of a channel decoder. The code division multiplexing satellite broadcasting receiver includes a demodulator for demodulating a predetermined channel among code division multiplexed channels, a deinterleaving unit for performing deinterleaving on a demodulated predetermined channel, and a deinterleaved predetermined channel. A channel switching unit for selectively switching a specific channel selected by the user, a channel decoding unit performing channel decoding on the switched specific channel, and a specific channel selected by the user among deinterleaved predetermined channels And a control unit for controlling the channel switching unit. Accordingly, hardware of the channel decoder can be reduced by performing channel decoding by selecting only a channel selected by an end user for a predetermined demodulated and deinterleaved channel, thereby reducing power consumption of the receiver.

Description

Satellite broadcast receiver and a method of receiving satellite broadcasts

The present invention relates to a satellite broadcast receiver, and more particularly, to a satellite broadcast receiver and a satellite broadcast receiving method for reducing hardware consumption and power consumption of a channel decoder by selectively decoding a minimum required channel among code division multiplexed channels. It is about.

FIG. 1 is a schematic block diagram of a satellite broadcasting receiver using a general code division multiplexing (CDM) method among satellite broadcasting methods.

The receiver has a demodulator 20, a deinterleaving unit 30, a channel decoding unit 50, a video audio synthesis unit 60, and an output unit 70.

The demodulator 20 demodulates a predetermined number of channels selected or selected by a user from among the multiplexed broadcast channels. The deinterleaving unit 30 performs deinterleaving on the demodulated predetermined channels, and the channel decoding unit 50 performs channel decoding on the deinterleaved predetermined channels.

The channel decoding unit 50 performs decoding in a predetermined manner corresponding to the encoding scheme of the transmitter. In general, Viterbi decoding, byte deinterleaving, and RS decoding are performed. The video speech synthesis unit 60 synthesizes the video signal, the audio signal, and the additional data of the channel selected by the user from among the decoded predetermined channels at an appropriate reproduction timing and outputs them to the output unit 70.

FIG. 2 is a diagram illustrating a reception process of satellite broadcast by the satellite broadcast receiver shown in FIG. 1.

As shown, the demodulator 20 demodulates m (m is an integer) channels selected or preselected by the user among the multiplexed channels.

The deinterleaving unit 30 has a deinterleaver memory corresponding to m channels, and the demodulated m channel data is stored in m deinterleaver memories to perform bit deinterleaving. Thereafter, m-deinterleaved m channels are subjected to channel decoding for each channel.

The channel decoding unit 50 has a Viterbit decoder, a byte deinterleaver, and an RS decoder corresponding to m channels, respectively. Accordingly, channel decoding is performed on data of the deinterleaved m channels through a Viterbit decoder, a byte deinterleaver, and an RS decoder corresponding to each channel.

In addition, the control data of the pilot channel is demodulated and then channel decoded through separate channel decoders (Viterbi Decoder, Byte Deinterleaver, Reed-Solomon Decoder) provided corresponding to the pilot channel.

As described above, the conventional satellite broadcasting receiver is provided such that the deinterleaving unit and the channel decoding unit (Viterbi decoder, byte deinterleaver, RS decoder, demux, video / audio decoder, etc.) are matched one-to-one on m channels. This performs all channel decoding on m channels.

Therefore, channel decoding is performed on channels other than the channel finally selected by the user. As a result, the conventional channel decoder has a large hardware size, and thus has a disadvantage in that power consumption is also large.

Accordingly, an object of the present invention is to provide a satellite broadcast receiver and a satellite broadcast receiving method thereof, which can reduce hardware and reduce power consumption by selectively channel decoding only a finally selected channel.

In addition, the present invention aims to achieve the above object by providing a satellite broadcast receiver having a channel decoder common to broadcast channels and pilot channels.

According to an aspect of the present invention, there is provided a satellite broadcast receiver including: a demodulator for demodulating a predetermined channel among code division multiplexed channels, and a deinterleaving unit for performing deinterleaving on the demodulated predetermined channel; A channel switching unit for selectively switching a specific channel selected by a user among the predetermined interleaved channels; A channel decoding unit performing channel decoding on the switched specific channel; And a control unit controlling the channel switching unit to switch the specific channel selected by the user among the predetermined interleaved channels.

Preferably, the channel decoding unit is commonly used to perform channel decoding on a broadcast channel for transmitting payload data and a pilot channel for transmitting control data.

The channel decoding unit has a channel decoder corresponding to the specific channel, and the channel decoder includes a Viterbi decoder, a byte deinterleaver, and an RS decoder (Reed-Solomon Decoder).

The specific channel includes a CAS (Conditional Access Service) channel for transmitting additional data, an EPG channel, a pilot channel, and at least one broadcast channel according to the user selection.

On the other hand, the satellite broadcast receiving method according to the present invention, a demodulation step for demodulating a predetermined channel of the code division multiplexed channel; A deinterleaving step of performing deinterleaving on the demodulated predetermined channels; A switching step of selectively switching a specific channel selected by a user among the predetermined interleaved channels; And a channel decoding step of performing channel decoding on the switched specific channel.

Preferably, the channel decoding step performs channel decoding on any one of a channel for transmitting payload data and a control channel for transmitting the control data.

Accordingly, hardware of the channel decoder can be reduced by performing channel decoding by selecting only a channel selected by an end user for a predetermined demodulated and deinterleaved channel, thereby reducing power consumption of the receiver.

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

3 is a schematic block diagram of a satellite broadcast receiver according to the present invention.

The satellite broadcasting receiver includes a demodulator 320, a deinterleaving unit 330, a channel switching unit 340, a channel decoding unit 350, a video voice synthesis unit 360, an output unit 370, and a controller 380. Has)

The demodulator 320 demodulates each channel for a predetermined channel, which is selected or preselected by a user from among code division multiplexed channels received from a receiver (not shown).

The deinterleaving unit 330 is a deinterleaver, and performs deinterleaving for each channel for a predetermined demodulated channel.

The channel switching unit 340 switches to select a specific channel corresponding to the user's selection from among the deinterleaved predetermined channels. That is, the controller 390 controls the channel switching unit 340 to select the channel selected by the user. The specific channel selected by the channel switching unit 340 is output to the channel decoding unit 350. Here, the specific channel is the most essential channel, and includes a CAS (Conditional Access Service) channel, an Electronic Program Guide (EPG) channel, a Pilot channel, and at least one broadcast channel according to a user selection. .

The channel decoder 350 performs channel decoding on a specific channel switched by the channel switcher 340. Channel decoding includes Viterbi decoding, byte deinterleaving, and RS decoding, wherein the channel decoding is performed channel by channel for a specific channel.

In addition, the channel decoding unit 350 performs channel decoding irrespective of a channel inputted in common for a broadcast channel and a pilot channel. In general, a channel of a satellite broadcast is classified into a broadcast channel for transmitting pay load data and a pilot channel for transmitting control data. Accordingly, a channel decoding method is applied differently. Therefore, the channel decoding unit 350 according to the present invention is shared for the broadcast channel and the pilot channel.

The video voice synthesis unit 360 synthesizes the video signal, the audio signal, and the additional data corresponding to the channel-decoded specific channel at an appropriate reproduction timing and outputs the result to the outside through the output unit 370.

The controller 380 controls overall system operation and controls channel selection. That is, the channel switching unit 340 is controlled to select a specific channel according to the user's selection for the code division multiplexed channel.

4 is a detailed block diagram of the satellite broadcast receiver shown in FIG. 3, and FIG. 5 is a flowchart illustrating a satellite broadcast reception method by the satellite broadcast receiver according to the present invention. 4 and 5, the satellite broadcast reception method according to the present invention will be described in more detail.

L (L is an integer) channels divided by a predetermined code (for example, Walsh code) at the transmitting side are received by the receiving unit 410 in parallel (S511).

For the received L channels, based on the information of the channels selected or preselected by the user, the controller 480 controls the receiver 410 so that M (M is an integer, L≥M) of L channels. Control to select two channels (S513).

The M channels selected by the receiver 410 are input to the demodulator 420. The demodulator 410 is provided with M demodulators corresponding to M channels. As a result, M demodulators demodulate M channels for each channel (S515).

The M channels demodulated through the demodulator 420 are input to the bit deinterleaving unit 430. The bit deinterleaving unit 430 has M deinterleaver memories corresponding to M channels, and the input M channels are stored in the corresponding deinterleaver memory.

After M channels are stored in the M deinterleaver memories, bit deinterleaving is performed and output (S517). Preferably, the pilot channel included in the M channels does not perform bit deinterleaving.

The M channels deinterleaved by the bit deinterleaving unit 430 are input to the channel switching unit 440. At this time, the channel switching unit 440 switches the N final channels selected by the user under the control of the control unit 480 and outputs them to the channel decoding unit 450 (S519). That is, only N channels to be finally received are delivered to the channel decoder 450.

The channel decoding unit 450 has N channel decoders corresponding to the last selected N channels, and the N channel decoders include a Viterbi decoder 451, a byte deinterleaver 453, and RS decoders (Reed-Solomon Decoders) 455 are included.

Accordingly, the N channel decoders 450 perform channel decoding on the last selected N channels (S521).

The video signal, the audio signal, and the additional data of the final reception channel decoded by the channel decoding unit 450 are synthesized at a predetermined reproduction timing and displayed externally through an output unit, that is, a display device (S523).

As such, by switching only the last necessary channel in the channel switching unit 440 to the channel decoding unit 450, the hardware of the channel decoding unit 450 may be minimized, thereby reducing power consumption of the system. .

In addition, the channel decoder 450 common to the broadcast channel and the pilot channel has an advantage of decoding another broadcast channel while the pilot channel is not transmitted.

6A to 6C illustrate various embodiments of a satellite broadcast reception method according to the present invention, wherein six channels are selected at a receiver for a code division multiplexed channel and stored in the deinterleaver memories 441 to 446, respectively. After the deinterleaving is performed, an example of channel decoding by the channel decoders 451 to 455 for the last five channels selected by the user is shown.

FIG. 6A illustrates a channel # 0, # 1, # 2, # 3, # 4, and # 5 de-interleaved by the user from the deinterleaver memory 441 to 446. , # 3, # 4. As illustrated, the channel switcher 440 switches channels # 0, # 1, # 2, # 3, and # 4 of the deinterleaved channels in response to the user's final selection, so that 5 of the channel decoder 450 Output to the four channel decoders 451 to 455, respectively. As a result, the channel decoding unit 450 performs channel decoding on the last selected channels # 0, # 1, # 2, # 3, and # 4, respectively.

On the other hand, as shown in Figure 6b, when the last selected channel is # 0, # 1, # 3, # 4, # 5, the channel switching unit 440 corresponding to the channel # 0, # 1, # 3 , # 4, # 5 are switched and output to the channel decoding unit 450. As a result, the channel decoding unit 450 performs channel decoding on the channels # 0, # 1, # 3, # 4, and # 5 finally selected.

On the other hand, as shown in Figure 6c, when the last selected channel is # 1, # 2, # 3, # 4, # 5, the channel switching unit 440 corresponding to the channel # 1, # 2, # 3 , # 4, # 5 are switched and output to the channel decoding unit 450. As a result, the channel decoding unit 450 performs channel decoding on the channels # 1, # 2, # 3, # 4, and # 5 finally selected.

As described above, the channel decoding unit 450 only needs a specific channel decoder (Viterbi decoder, byte deinterleaver, RS decoder) for decoding the specific channel required for the final reception.

Therefore, hardware reduction of the system and power consumption accordingly can be reduced.

According to the present invention, hardware of a channel decoder can be reduced by performing channel decoding by selecting only a channel selected by an end user for a predetermined demodulated and deinterleaved channel, thereby reducing power consumption of a receiver.

In addition, the channel decoder is shared with the broadcast channel and the pilot channel for hardware reduction, and the channel decoding can be performed for the broadcast channel while the pilot channel is not transmitted.

Although the present invention has been described in detail through the representative embodiments, those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention with respect to the embodiments described above. Will understand. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a schematic block diagram of a conventional satellite broadcast receiver;

FIG. 2 is a view for explaining a received signal processing procedure of the satellite broadcast receiver shown in FIG. 1;

3 is a schematic block diagram of a satellite broadcast receiver according to the present invention;

4 is a detailed block diagram illustrating a satellite broadcast reception process by the satellite broadcast receiver shown in FIG. 3;

5 is a flowchart illustrating a satellite broadcast reception method by the satellite broadcast receiver shown in FIG. 3;

6A to 6C illustrate various examples of a satellite broadcast reception process according to the present invention.

Explanation of symbols on main parts of drawing

320,420: demodulation unit 330,430: deinterleaving unit

340,440: channel switching unit 350,450: channel decoding unit

360: video and voice synthesis unit 370: output unit

380: control unit 410: receiving unit

451: Viterbi decoder 453: byte deinterleaver

455: RS decoder

Claims (8)

In the satellite broadcasting receiver of the code division multiplexing method, A demodulator for demodulating a predetermined channel among code division multiplexed channels; A deinterleaving unit performing deinterleaving on the demodulated predetermined channels; A channel switching unit for selectively switching a specific channel selected by a user among the predetermined interleaved channels; A channel decoding unit performing channel decoding on the switched specific channel; And And a controller configured to control the channel switching unit to switch the specific channel selected by the user among the predetermined interleaved channels. The method of claim 1, The channel decoding unit, And a common channel for performing channel decoding on a broadcast channel for transmitting payload data and a pilot channel for transmitting control data. The method of claim 1, The channel decoding unit, A channel decoder corresponding to the specific channel; The channel decoder includes a Viterbi Decoder, a byte deinterleaver, and an RS decoder (Reed-Solomon Decoder). The method of claim 1, The specific channel, And a conditional access service (CAS) channel for transmitting additional data, an electronic program guide (EPG) channel and a pilot channel, and at least one broadcast channel according to the user selection. In the satellite broadcasting reception method of the code division multiplexing method, A demodulation step of performing demodulation on a predetermined channel among code division multiplexed channels; A deinterleaving step of performing deinterleaving on the demodulated predetermined channels; A switching step of selectively switching a specific channel selected by a user among the predetermined interleaved channels; And And a channel decoding step of performing channel decoding on the switched specific channels. The method of claim 5, The channel decoding step, And performing channel decoding on any one of a channel for transmitting payload data and a control channel for transmitting the control data. The method of claim 5, The channel decoding step, Performing channel decoding on each of the specific channels, Wherein each channel decoding comprises Viterbi decoding, byte deinterleaving, and RS decoding. The method of claim 5, The specific channel, A CAS (Conditional Access Service) channel for transmitting additional data, an EPG channel, a pilot channel, and at least one broadcast channel according to the user's selection .