CN1301007C - Digital broadcast receiver and digital broadcast receiving method thereof - Google Patents

Abstract

A digital broadcast receiver and a digital broadcast receiving method for reducing a hardware part and power consumption of a channel decoder are disclosed. A digital broadcasting receiver in a Code Division Multiple Access (CDMA) scheme includes: a demodulator for demodulating some of the CDMA channels; a deinterleaver for deinterleaving the demodulated channel; a channel switching unit for selectively switching on a specific channel selected by a user from the deinterleaved channels; a channel decoder for decoding the particular channel switched on; and a controller for controlling the channel switching unit to switch on a specific channel selected by a user from the deinterleaved channels. Accordingly, the present invention can select only a channel last selected by a user from among demodulated and deinterleaved channels and decode the selected channel, thereby reducing the number of hardware parts of a channel decoder and accordingly reducing power consumption of a receiver.

Description

Digital broadcast receiver and digital broadcast receiving method thereof

Cross References to Related Applications

This application claims the benefit of Korean Patent Application No. P2003-71338 filed with the Korean Intellectual Property Office on October 14, 2003, the disclosure of which is incorporated herein by reference.

technical field

The present invention relates to a digital broadcast receiver, and in particular to a digital broadcast receiver and a digital broadcast receiving method thereof, which selectively decodes the least channels from Code Division Multiple Access (CDMA) channels to reduce Number of hardware parts and power consumption of the channel decoder.

Background technique

FIG. 1 is a diagram schematically showing a digital broadcast receiver using a general code division multiple access (CDMA) scheme of the digital broadcast receiver.

The receiver has a demodulator 20 , a deinterleaver 30 , a channel decoder 50 , a video/audio mixer 60 and an output unit 70 .

The demodulator 20 demodulates certain channels selected or pre-selected by the user from the received CDMA broadcast channels. The deinterleaver 30 deinterleaves the demodulated channel, and the channel decoder 50 decodes the deinterleaved channel.

The channel decoder 50 performs decoding in a predetermined scheme corresponding to the coding scheme of the transmitter. Typically, channel decoder 50 performs Viterbi decoding, byte deinterleaving and RS decoding. The video/audio mixer 60 mixes the video signal, the audio signal, and the additional data of the channel last selected by the user from the decoded channels at an appropriate reproduction timing, and outputs the mixed signal to the output unit 70 .

FIG. 2 is a diagram explaining a digital broadcast receiving process for the digital broadcast receiver shown in FIG. 1. Referring to FIG.

As shown in FIG. 2, demodulator 20 demodulates m channels selected by a user or preselected from among CDMA channels, where m is an integer.

The deinterleaver 30 has deinterleaver memories corresponding to m channels, and data of m demodulated channels is stored in m deinterleaver memories for bit interleaving. Thereafter, the m deinterleaved channels are decoded one by one, channel by channel.

The channel decoder 50 has a Viterbi decoder corresponding to m channels, a byte deinterleaver, and an RS decoder. Therefore, the data of the m deinterleaved channels are decoded by the Viterbi decoder, the byte deinterleaver, and the RS decoder corresponding to each channel.

In addition, control data from the pilot channel is demodulated and passed through a channel decoder such as a Viterbi decoder, a byte deinterleaver and a Reed-Solomon decoder respectively provided, decode it.

As described above, a conventional digital broadcasting receiver has a deinterleaver and a channel decoder having functions such as Viterbi decoder, byte deinterleaver, RS decoder, DEMUX, video/audio decoding A decoder such as a decoder is provided in a form of one-to-one matching with m channels, thereby performing channel decoding for all m channels.

Therefore, the conventional digital broadcasting receiver decodes channels other than the channel last selected by the user, so the size of the conventional channel decoder becomes large and accordingly has a disadvantage of high power consumption.

Contents of the invention

Accordingly, an aspect of the present invention is to provide a digital broadcasting receiver and a digital broadcasting receiving method thereof that selectively decodes only a last selected channel to reduce the number of hardware parts and power consumption.

Another aspect of the present invention is to provide a digital broadcast receiver having a common channel decoder for a broadcast channel and a pilot channel.

In order to achieve the above aspects, the digital broadcast receiver according to the present invention includes: a demodulator, used to demodulate certain channels in CDMA channels; a deinterleaver, used to deinterleave demodulated channels; a channel switching unit, used to select Turn on the specific channel selected by the user from the deinterleaving channels; the channel decoder is used to decode the specific channel connected; and the controller is used to control the channel switching unit to turn on the channel selected by the user from the deinterleaving channels specific channel.

Preferably, the channel decoders are commonly used for decoding the broadcast channel for transmitting payload data and the pilot channel for transmitting control data.

The channel decoder has a channel decoder corresponding to a specific channel, and the channel decoder includes a Viterbi decoder, a byte deinterleaver, and a Reed-Solomon decoder.

The specific channels include a conditional access service (CAS) channel, an electronic program guide (EPG) channel, and a pilot channel, and at least one or more broadcast channels according to a user's selection.

Meanwhile, the digital broadcast receiving method according to the present invention includes the steps of: demodulating some of the CDMA channels; deinterleaving and demodulating the channels; selecting and turning on a specific channel selected by the user from the deinterleaving channels; and decoding the turned on specific channel.

Preferably, the channel decoding step decodes a channel for transmitting payload data or decodes a control channel for transmitting control data.

Therefore, the receiver according to the present invention can select and decode only the channel last selected by the user from the demodulated and deinterleaved channels, and thus can reduce the number of hardware parts and the receiver can reduce power consumption accordingly.

Description of drawings

The invention is described in detail with reference to the following drawings in which like reference numerals indicate like elements, wherein:

FIG. 1 is a block diagram schematically showing a conventional digital broadcast receiver;

FIG. 2 is a diagram explaining a process of receiving a signal for the digital broadcast receiver shown in FIG. 1;

3 is a block diagram schematically showing a digital broadcast receiver according to an embodiment of the present invention;

FIG. 4 is a detailed block diagram for explaining a digital broadcast receiving process for the digital broadcast receiver shown in FIG. 3;

5 is a flowchart showing a digital broadcast receiving method for the digital broadcast receiver shown in FIG. 3; and

6A to 6C are diagrams illustrating a digital broadcast receiving process according to various embodiments of the present invention.

Detailed ways

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

FIG. 3 is a block diagram schematically showing a digital broadcast receiver according to an embodiment of the present invention.

The digital broadcasting receiver has a demodulation unit 320 , a deinterleaver 330 , a channel switching unit 340 , a channel decoder 350 , a video/audio mixer 360 , an output unit 370 and a controller 380 .

The demodulation unit 320 demodulates channels channel by channel, which is selected by the user or preselected from CDMA channels received from a receiver (not shown).

The deinterleaver 330 is a deinterleaver such as a bit deinterleaver, and it deinterleaves demodulated channels channel by channel.

The channel switching unit 340 performs switching to select a specific channel from de-interleaved channels according to a user's selection. That is, the controller 390 controls the channel switching unit 340 to select a channel selected by the user. The specific channel selected from channel switching unit 340 is output to channel decoder 350 . Here, the specific channel is the most important channel, including a conditional access service (CAS) channel, an electronic program guide (EPG) channel, a pilot channel, and at least one or more broadcast channels according to user's selection.

The channel decoder 350 decodes a specific channel switched on by the channel switching unit 340 . Channel decoding includes Viterbi decoding, byte decoding, and RS decoding, and channel decoding is performed on a specific channel channel by channel.

In addition, for the broadcast channel and the pilot channel, the channel decoder 350 is commonly used to decode the channel regardless of the input channel. Generally, digital broadcast channels are classified into broadcast channels for transmitting payload data and pilot channels for transmitting control data, and accordingly, different channel decoding schemes are applied to different channels. Therefore, the channel decoder 350 according to the present invention is common to the broadcast channel and the pilot channel.

The video/audio mixer 360 mixes a video signal, an audio signal, and additional data corresponding to a specific decoding channel at an appropriate reproduction timing, and externally outputs the mixed signal through the output unit 370 .

Controller 380 controls the operation of the overall system and controls channel selection. That is, the controller 380 controls the channel switching unit 340 to select a specific channel from the CDMA channels according to the user's selection.

FIG. 4 is a detailed block diagram showing the digital broadcast receiver shown in FIG. 3, and FIG. 5 is a flowchart showing a digital broadcast receiving method for the digital broadcast receiver according to the present invention. 4 and 5, the digital broadcast receiving method according to the present invention will be described in more detail.

The receiver 410 receives in parallel L channels divided by a predetermined code such as Walsh code (S511) at the transmission side (S511), where L is an integer.

The controller 480 controls the receiver 410 to select M channels among the L channels based on information on user-selected or pre-selected channels (S513), where M is an integer and L≧M.

The M channels selected by the receiver 410 are input into the demodulator 420 . The demodulator 420 has M demodulators corresponding to M channels. Accordingly, the M demodulators demodulate the M channels channel by channel (S515).

The M channels demodulated by the demodulator 420 are input into the bit deinterleaver 430 . The bit deinterleaver 430 has M deinterleaver memories corresponding to M channels, and the input M channels are respectively stored in the corresponding deinterleaver memories.

After storing the M channels in the M deinterleaver memory, the bit deinterleaver 430 performs bit deinterleaving on the stored M channels for output (S517). Preferably, no bit deinterleaving is performed for the pilot channels contained in the M channels.

The M channels deinterleaved in the bit deinterleaver 430 are input to the channel switching unit 440 . At this time, the channel switching unit 440 turns on the N channels last selected by the user according to the control of the controller 480, and outputs the N channels to the channel decoder 450 (S519). That is, only the N channels to be received last are sent to the channel decoder 450 .

The channel decoder 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 an RS decoder device 455.

Therefore, the N channel decoder 450 decodes the last selected N channels (S521).

Using specific reproduction timing, the video signal, audio signal and additional data from the last received channel decoded in the channel decoder 450 are mixed and then externally displayed through the output unit 370, ie, the display unit (S523).

As mentioned above, the present invention only connects the last required channels in the channel switching unit 440, and sends these channels to the channel decoder 450, thereby minimizing the hardware part of the channel decoder 450, so reducing the number of channels in the system. power consumption.

In addition, the present invention has an advantage that the channel decoder 450 common to the broadcast channel and the pilot channel can decode other broadcast channels while not transmitting the pilot channel.

6A to 6C are diagrams illustrating a digital broadcast receiving process according to various embodiments of the present invention, in which the receiver 410 selects 6 channels from the CDMA channels, and stores the selected channels in the deinterleaver memory, respectively. 441, 442, 443, 444, 445 and 446 and deinterleave them, and in channel decoders 451, 452, 453, 454 and 455 the last 5 channels selected by the user are decoded.

FIG. 6A is a diagram showing the following situation: the user selects channels #0, #1, #2, #3, #4, and Channels #0, #1, #2, #3 and #4 are finally selected in #5. As shown in Figure 6A, the channel switching unit 440 turns on the channels #0, #1, #2, #3 and #4 in the deinterleaving channel according to the user's final selection, and switches the channels #0, #1, #2 , #3, and #4 are output to five channel decoders 451, 452, 453, 454, and 455 of the channel decoder 450, respectively. Accordingly, the channel decoder 450 decodes each of the last selected channels #0, #1, #2, #3, and #4.

Simultaneously, in the case that channel #0, #1, #3, #4 and #5 are finally selected as shown in Figure 6B, the channel switching unit 440 turns on channel #0, #1, #3, #4 and #5, and output it to the channel decoder 450. Accordingly, the channel decoder 450 decodes each of the last selected channels #0, #1, #3, #4, and #5.

Simultaneously, in the case of finally selecting channels #1, #2, #3, #4 and #5 as shown in Figure 6C, the channel switching unit 440 turns on channels #1, #2, #3, #4 and #5, and output it to the channel decoder 450. Accordingly, the channel decoder 450 decodes each of the last selected channels #1, #2, #3, #4 and #5.

As described above, the channel decoder 450 requires only specific channel decoders such as a Viterbi decoder, a byte deinterleaver, and an RS decoder in order to decode a specific channel required for final signal reception.

Therefore, the present invention can not only reduce the number of hardware parts of the system, but also reduce power consumption accordingly.

The present invention selects and decodes only the last channel selected by the user from the demodulated and deinterleaved channels, thereby reducing the hardware part of the channel decoder and correspondingly reducing the power consumption of the receiver.

In addition, the present invention has advantages that a channel decoder can be commonly used for a broadcast channel and a pilot channel to reduce hardware parts, and decode a broadcast channel while not transmitting a pilot channel.

Although the preferred embodiment of the present invention has been described, those skilled in the art should understand that the present invention is not limited to the described preferred embodiment, but can be implemented within the spirit and scope of the invention defined by the appended claims. Various changes and modifications are made.

Claims (8)

1. one kind is inserted the digital broadcasting transmitter of receiving digital broadcast in the CDMA scheme at code division multiple access, comprising:

Demodulator is used for some channel of demodulation CDMA Channel;

Deinterleaver is used to the demodulated channel that deinterleaves;

The channel switch unit is used for connecting selectively the particular channel of being selected by the channel of user after deinterleave;

Channel decoder is used to decipher the particular channel of being connected; With

Controller is used for controlling this channel switch unit and connects the particular channel of being selected by the channel of user after deinterleave.

2. digital broadcasting transmitter as claimed in claim 1, wherein, channel decoder is common to the pilot channel that decoding sends the broadcast channel of load data and sends control data.

3. digital broadcasting transmitter as claimed in claim 1, wherein, channel decoder has and the corresponding channel decoder of particular channel, and this channel decoder comprises viterbi decoder, byte deinterleaver and Reed-Solomon decoder.

4. digital broadcasting transmitter as claimed in claim 1, wherein, this particular channel comprises condition access service CAS channel, electronic program guide (EPG) channel and pilot channel, and according at least one or a plurality of broadcast channel of user's selection.

5. one kind is inserted the digital broadcast receiving method of receiving digital broadcast in the CDMA scheme at code division multiple access, comprises step:

Some channel in the demodulation CDMA Channel;

Demodulated channel deinterleaves;

Connect the particular channel of selecting by the channel of user after deinterleaving selectively; With

The particular channel that decoding is connected.

6. digital broadcast receiving method as claimed in claim 5, wherein, this channel decoding step or decoding are used to send the channel of load data, and perhaps decoding is used to send the pilot channel of control data.

7. digital broadcast receiving method as claimed in claim 5, wherein, each of this channel decoding step decoding particular channel, and this channel decoding comprises that Viterbi decoding, byte deinterleave and Reed-Solomon decoding.

8. digital broadcast receiving method as claimed in claim 5, wherein, this particular channel comprises condition access service CAS channel, electronic program guide (EPG) channel and the pilot channel that is used to send additional data, and according at least one or a plurality of broadcast channel of user's selection.

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