KR100856263B1 - Multi broadcasting reciever - Google Patents

Abstract

A multi-broadcasting receiver is provided to reduce a volume of a product and a cost by receiving a plurality of broadcasting signals with different broadcasting formats through a simple receiver without additional receivers by broadcasting types. A multi-broadcasting receiver includes an IF signal processor(110), a filter(120), an amplifier(130), and a demodulator(140). The IF signal processor processes a plurality of broadcasting signals to an IF signal with different broadcasting types. The filter passes the IF signal through a set frequency band. The amplifier amplifies the IF signal from the filter by a set gain, and transfers an IF signal among the amplified IF signals corresponding to a broadcasting type selected according to a control signal. The demodulator demodulates the IF signals from the amplifier by broadcasting types according to a broadcasting selection signal. The demodulator includes a digital terrestrial broadcasting demodulator demodulating an IF signal corresponding to a digital terrestrial broadcasting signal according to the broadcasting selection signal and a cable broadcasting demodulator demodulating an IF signal corresponding to a cable broadcasting signal according to the broadcasting selection signal.

Description

Composite broadcast receiver {MULTI BROADCASTING RECIEVER}

1 is a structure of a receiving device of the present invention.

<Detailed Description of Major Symbols in Drawing>

100 ... Broadcast receiver 110 ... IF signal processor

111 ... band processor 111a ... UHF handler

111b ... VHF-L Processor 111c ... VHF-L Processor

112 ... down converter 112a ... first mixer

112b ... 2nd mixer 112c ... 3rd mixer

112d ... 1st Oscillator 112e ... 2nd Oscillator

112f ... 3rd oscillator 113 ... IF filter

114.First Amplifier 115 ... Auto Gain Detector

116 Controller 120 Filter Unit

121 ... digital SAW filter 122 ... analog SAW filter

130 ... amplifier 131 ... second amplifier

132 selector 140 demodulator

141 terrestrial digital demodulator 142 cable demodulator

143 terrestrial analog broadcast demodulator 144 oscillator

A ... MOPLL IC

The present invention relates to a composite broadcast receiver, and more particularly, to a composite broadcast receiver for receiving and demodulating a plurality of broadcast signals having different transmission schemes, in particular, a terrestrial broadcast signal and a cable broadcast signal.

As digital broadcasts are currently being broadcast through terrestrial waves, terrestrial analog broadcasts, terrestrial digital broadcasts, and cable broadcasts having different broadcast methods are mixed and broadcast.

Conventionally, when receiving and watching such a broadcast signal, a separate receiver for each scheme is required. That is, for example, when receiving and watching terrestrial digital broadcasting and cable broadcasting, the broadcasting apparatus is provided with a receiving apparatus suitable for terrestrial digital broadcasting and a receiving apparatus suitable for cable broadcasting.

As described above, in order to receive and demodulate broadcast signals having different broadcast methods, the conventional broadcast receiving apparatus must separately purchase a suitable receiving apparatus or have a plurality of tuners suitable for each broadcast to watch various broadcasts. There is a problem that the volume to occupy becomes large and additional costs are generated.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a complex broadcast receiver for receiving and demodulating a plurality of broadcast signals having different broadcast methods, in particular, a terrestrial broadcast signal and a cable broadcast signal by a single receiver.

In order to achieve the above object, the broadcast receiving apparatus of the present invention includes an IF signal processor for processing a plurality of broadcast signals having different broadcast schemes as IF signals according to channel selection signals, and an IF signal from the IF signal processor in advance. A filter unit for passing a predetermined frequency band, an amplifier unit amplifying the IF signal from the filter unit with a preset gain, and delivering an IF signal corresponding to a broadcasting method selected according to a control signal among the amplified IF signals; And a demodulator for demodulating the IF signal from the amplifier according to the broadcast method according to the broadcast selection signal.

According to an embodiment of the present invention, the broadcast signal may include a terrestrial digital broadcast signal and a cable broadcast signal, wherein the demodulator corresponds to terrestrial digital broadcast among IF signals from the filter unit according to the broadcast selection signal. And a terrestrial digital broadcast demodulator for demodulating an IF signal, and a cable broadcast demodulator for demodulating an IF signal corresponding to cable broadcasting among IF signals from the filter unit according to the broadcast selection signal.

According to an embodiment of the present invention, the demodulator may further include an oscillator for providing a preset reference frequency to the terrestrial digital broadcast demodulator and the cable broadcast demodulator.

According to an embodiment of the present invention, the broadcast signal may further include a terrestrial analog broadcast signal, and the demodulator further demodulates a terrestrial analog broadcast demodulator for demodulating an IF signal corresponding to the terrestrial analog broadcast signal from the filter unit. It may include.

According to an embodiment of the present invention, the filter unit includes a digital SAW filter for passing an IF signal corresponding to terrestrial digital broadcasting and cable broadcasting among the IF signals from the IF signal processing unit in a preset frequency band, and the IF signal processing unit. It may include an analog SAW filter for passing the IF signal corresponding to the terrestrial analog broadcast from the IF signal from the predetermined frequency band.

According to an embodiment of the present invention, the amplifying unit selects an amplifier for amplifying an IF signal from the digital SAW filter and an IF signal from the amplifier to the terrestrial digital broadcast demodulator or the cable broadcast demodulator according to the control signal. It may include a selector for transmitting to.

According to an embodiment of the present invention, the IF signal processor includes a band processor for filtering and amplifying the broadcast signal for each of the UHF band, VHF-L band, and VHF-H band, and the filtered broadcast for each band from the band processor. A down converter for mixing the signal with a frequency signal, an IF filter for passing the IF signal from the down converter to a preset frequency band, an amplifier for amplifying the IF signal from the IF filter, and an IF from the amplifier. An automatic gain detector for detecting a signal level of a signal, controlling an amplification ratio of the band processor according to the signal level from the automatic gain detector, and controlling a frequency of the frequency signal of the down converter according to the channel selection signal It may include a controller.

According to one embodiment of the invention, the controller and the down converter may be formed of at least one programmable IC.

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

1 is a block diagram showing the structure of a broadcast receiving apparatus of the present invention.

Referring to FIG. 1, the broadcast receiving apparatus 100 of the present invention may include an IF signal processor 110, a filter unit 120, an amplifier 130, and a demodulator 140.

The IF signal processor 110 receives a plurality of broadcast signals having different broadcast schemes through a signal input terminal. The broadcast signal may include a terrestrial digital broadcast signal, a cable broadcast signal, and a terrestrial analog broadcast signal. The received broadcast signal is amplified and filtered and down converted to an IF (Immediate Frequendy) signal.

Accordingly, the IF signal processor 110 may include a band processor 111 for amplifying and filtering the received broadcast signal for each preset frequency band, and amplified and filtered signals from the band processor 111 with the frequency signal. A down converter 112 for mixing and converting the IF signal, and an IF filter 113 for filtering the IF signal from the down converter 112 to a predetermined frequency band, and the filtered IF signal from the IF filter 113. And an amplifier 114 that amplifies with a preset gain.

The band processor 111 may include a UHF processor 111a, a VHF-H processor 111b, and a VHF-L processor 111c to amplify and filter the received broadcast signal for each frequency band used. The processors 111a, 111b, and 111c may each include a filter for filtering the received broadcast signal for each preset frequency band and an amplifier for amplifying the preset gain. Here, the frequency bands of the processors 111a, 111b, and 111c may be set in advance. For example, the UHF band may be set to 474 MHz to 860 MHz, and the VHF-H band may be set to 171 MHz to 466 MHz. The VHF-L band can be set from 50MHz to 170MHz.

The down converter 112 converts the broadcast signal from the band processor 111 into an IF signal for each band. Accordingly, the down converter 112 mixes the first and third mixers 112a, 112b and 112c and the first to third mixers 112a, 112b and 112c for mixing the broadcast signals from the band processor 111 for each band. ) May include first to third oscillators 112d, 112e, and 112f respectively providing frequency signals having frequencies.

The IF signal from the down converter 112 is bandpassed through an IF filter 113 having a preset frequency band and amplified by the first amplifier 114.

Meanwhile, the IF signal processor 110 converts a broadcast signal of a corresponding channel into an IF signal according to the channel selection signal. Accordingly, the IF signal processing unit 110 includes an automatic gain detector 115 that detects a signal level of the IF signal amplified by the first amplifier 114, an amplification factor of the IF signal, and the IF signal processing unit 110. The controller 116 may control the frequencies of the first to third oscillators 112d, 112e, and 112f.

The automatic gain detector 115 detects a signal level of the IF signal from the first amplifier 114 of the IF signal processor 110 and transmits the signal level to the controller 116. The controller 116 controls the amplification ratios of the band processors 111a, 111b, and 111c of the band processor 111 in accordance with the level of the detection signal of the automatic gain detector 115. In addition, the frequencies of the first to third oscillators 112d, 112e, and 112f are controlled according to the channel selection signal. Accordingly, the controller 116 may perform a phase locked loop (PLL) function.

The down converter 112 and the controller 116 described above may be configured with at least one programmable IC (A), which may be a mixer oscillator phase-locked loop (MOPLL) IC.

The filter unit 120 filters the IF signal from the IF signal processing unit 110 to a preset frequency band. Accordingly, the filter unit 120 may pass a digital surface acoustic wave (SAW) filter 121 that passes an IF signal corresponding to terrestrial digital broadcasting and cable broadcasting among the IF signals from the IF signal processing unit 110 in a preset frequency band. ) And an analog SAW filter 122 for passing an IF signal corresponding to terrestrial analog broadcasting among the IF signals from the IF signal processing unit 110 in a preset frequency band.

Here, the frequency band of the digital SAW filter 121 may be set to 36.125MHz as the center frequency to 7MHz or 8MHz as the frequency bandwidth, the frequency band of the analog SAW filter 122 is set to 38.9MHz to the center frequency 6MHz You can set 5MHz as the frequency bandwidth at.

The amplifier 130 amplifies the IF signal from the filter unit 120 with a preset gain, selects an IF signal corresponding to a terrestrial digital broadcast signal or a cable broadcast signal from among the IF signals amplified according to the control signal, and restores the IF signal. The grandfather 140 to deliver.

Accordingly, the amplifier 130 amplifies the IF signal from the filter unit 120 with a preset gain and amplified IF from the second amplifier 131 according to the control signal. The selector 132 may select an IF signal corresponding to terrestrial digital broadcasting or cable broadcasting from the signal and transmit the selected IF signal to the demodulator 140.

The control signal may be transmitted from the demodulator 140, and may be received from the outside of the reception device 100.

The demodulator 140 demodulates the IF signal from the amplifying unit 130 for each transmission scheme, and thus may include a plurality of transmission scheme demodulators. As described above, when the broadcast signal is a terrestrial digital broadcast signal or a cable broadcast signal, the broadcast signal may include a terrestrial digital broadcast demodulator 141 and a cable broadcast demodulator 142. The broadcast signal may further include a terrestrial analog broadcast signal. If so, the demodulator may further include a terrestrial analog broadcast demodulator 143.

Each demodulator 141, 142, or 143 of the demodulator 140 may perform a demodulation operation according to broadcast selection signals Bs1, Bs2, and Bs3 from the outside of the reception apparatus 100. In addition, the demodulator 140 may further include an oscillator 144 to provide a frequency signal having a preset reference frequency to the terrestrial digital broadcast demodulator 141 and the cable broadcast demodulator 142, thereby terrestrial digital broadcast. When the demodulator 141 and the cable broadcast demodulator 142 are each configured with one IC, the same frequency converter may adopt the same IC to use the oscillator 144 in common.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, but is defined by the claims below, and the configuration of the present invention may be modified in various ways without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art that the present invention may be changed and modified.

As described above, according to the present invention, a plurality of broadcast signals having different broadcast methods may be received through a single receiver without using a separate broadcast method receiver, thereby reducing the volume of a product and reducing the cost. It works.

Claims (8)

An IF signal processor for processing a plurality of broadcast signals having different broadcast schemes as IF signals according to channel selection signals; A filter unit which passes the IF signal from the IF signal processor in a preset frequency band; An amplifier for amplifying the IF signal from the filter unit with a preset gain and delivering an IF signal corresponding to a broadcasting method selected according to a control signal among the amplified IF signals; And A demodulator for demodulating the IF signal from the amplifier according to the broadcast method according to a broadcast selection signal; The broadcast signal includes a terrestrial digital broadcast signal and a cable broadcast signal. The demodulator comprises a terrestrial digital broadcast demodulator for demodulating an IF signal corresponding to terrestrial digital broadcasting among IF signals from the filter unit according to the broadcast selection signal, and a cable broadcast among IF signals from the filter unit according to the broadcast selection signal. A cable broadcast demodulator for demodulating an IF signal corresponding to The demodulator further comprises an oscillator for providing a preset reference frequency to the terrestrial digital broadcast demodulator and the cable broadcast demodulator. delete delete The method of claim 1, The broadcast signal further includes a terrestrial analog broadcast signal, The demodulation unit further comprises a terrestrial analog broadcast demodulator for demodulating an IF signal corresponding to the terrestrial analog broadcast signal from the filter unit. The method of claim 4, wherein the filter unit A digital SAW filter for passing IF signals corresponding to terrestrial digital broadcasting and cable broadcasting among the IF signals from the IF signal processor in a preset frequency band; And Analog SAW filter which passes IF signal corresponding to terrestrial analog broadcasting among IF signals from the IF signal processor in a preset frequency band Composite broadcast receiving apparatus comprising a. The method of claim 5, wherein the amplification unit An amplifier amplifying the IF signal from the digital SAW filter; And A selector for selectively transmitting an IF signal from the amplifier to the terrestrial digital broadcast demodulator or the cable broadcast demodulator according to the control signal Composite broadcast receiving apparatus comprising a. An IF signal processor for processing a plurality of broadcast signals having different broadcast schemes as IF signals according to channel selection signals; A filter unit which passes the IF signal from the IF signal processor in a preset frequency band; An amplifier for amplifying the IF signal from the filter unit with a preset gain and delivering an IF signal corresponding to a broadcasting method selected according to a control signal among the amplified IF signals; And A demodulator for demodulating the IF signal from the amplifier according to the broadcast method according to a broadcast selection signal; The IF signal processor A band processor for filtering and amplifying the broadcast signal by UHF band, VHF-L band, and VHF-H band; A down converter for mixing the broadcast signal filtered for each band from the band processor with a frequency signal, respectively; An IF filter for passing the IF signal from the down converter in a preset frequency band; And Amplifier for amplifying the IF signal from the IF filter An automatic gain detector for detecting a signal level of an IF signal from the amplifier; And A controller for controlling the amplification ratio of the band processor according to the signal level from the automatic gain detector and controlling the frequency of the frequency signal of the down converter according to the channel selection signal Composite broadcast receiving apparatus comprising a. The method of claim 7, wherein And the controller and the down converter are formed of at least one programmable IC.

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