KR100772232B1 - Tunning method and apparatus - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a tuning apparatus and method capable of minimizing noise due to a mixed frequency for tuning of one channel by allowing one or more channels to be tuned in different ways in a tuning apparatus for tuning one or more channels. The purpose.

The tuning device according to the present invention includes a first tuner that receives a broadcast signal and tunes only a broadcast signal received through a first channel among the broadcast signals, and receives the broadcast signal and receives a second channel among the broadcast signals. The second tuner for tuning only the broadcast signal received through the control, according to the frequency interval between the first and second channels, a control unit for controlling the first tuner and the second tuner to tune in a different tuning scheme of the various tuning schemes It is characterized by including.

In particular, when the frequency interval between the first and second channels is within a predetermined range, the first tuner is tuned by a lower super heterodyne method or an upper super heterodyne method. The second tuner may be controlled to tune in an upper super heterodyne method or a lower super heterodyne method.

In addition, the tuning method according to the present invention, the first step of checking whether the tuning of one or more channels from a broadcast signal is requested, and if the tuning of the one or more channels is requested, whether the frequency interval of the tuning requested channels are within a predetermined range The second step of checking, If the frequency interval of the channels are within a predetermined range, characterized in that it comprises a third step of tuning the one or more channels in different ways.

Particularly, in the third step, if a frequency interval of the channels is within a predetermined range, one channel is tuned by a lower super heterodyne method or an upper super heterodyne method, and the other channel is upper It is characterized by tuning in a super heterodyne mode or a lower super heterodyne mode.

Tuner, Lower / Upper Super Heterodyne, Noise

Description

Tuning device and method {TUNNING METHOD AND APPARATUS}

1 is a block diagram of a conventional tuning device.

2 is a view showing an operation waveform diagram of a conventional tuning device.

3 is a block diagram of a tuning device according to a preferred embodiment of the present invention.

4 is a flowchart of a tuning method according to a preferred embodiment of the present invention.

5 is a view showing an operation waveform diagram of a tuning device according to a preferred embodiment of the present invention;

<Explanation of symbols for main parts of the drawings>

200: control unit

202: memory section

204: main tuner

206: First OSC

208: first frequency mixing section

210: first IF amplifier

212: subtuner

214: second OSC

216: second frequency mixing section

218: second IF amplifier

The present invention relates to a tuner, and more particularly, to a tuner apparatus and method capable of tuning two channels.

With the development of technology, the performance and functions of television broadcast receivers have also been improved, providing various services to users.

For example, a television broadcast receiver provides a picture in picture (PIP) function to satisfy various needs of a user by outputting broadcast signals from one or more channels or output signals from one or more input sources. It was.

As described above, in order to output broadcast signals from one or more channels, a television broadcast receiver must be equipped with a tuner capable of tuning one or more channels.

1 shows a configuration of a tuner capable of tuning one or more channels.

The tuner includes a main tuner 100 and a sub-tuner 102. The main tuner 100 tunes a predetermined channel among broadcast signals received through an antenna, etc. under control of a controller (not shown). The tuner 100 receives a broadcast signal through the main tuner 100 and tunes a predetermined channel among the tuners 100 under the control of the controller.

In general, the main tuner 100 and the sub-tuner 102 perform tuning in an upper super heterodyne or lower super heterodyne manner, and thus, the main tuner 100 and the sub-tuner 102 are tuned. ), Noise is generated in the tuned signal according to the interval between frequencies.

In more detail, when the main tuner 100 and the sub-tuner 102 tune channels having a frequency interval similar to the frequency band of the IF signal, noise is generated in a signal that the sub-tuner 102 tunes and outputs.

For example, when the frequency of the channel to be tuned by the main tuner 100 is 152.7 [MHz] and the frequency of the channel to be tuned by the sub-tuner 102 is 192 [MHz], The tuner 100 mixes a frequency of 191.65 [MHz] with a broadcast signal to move the 152.7 [MHz] broadcast signal to a 38.9 [MHz] band.

At this time, 191.65 [MHz], which is the mixing frequency of the first main tuner 100, affects 192 [MHz], which is the tuning frequency of the sub-tuner 102, causing noise in the 192 [MHz] band. This noise is because 191.65 [MHz], which is a mixed frequency of the first main tuner 100, is introduced into the broadcast signal through the ground of the OSC (Osillator) of the main tuner 100.

Accordingly, in the prior art, the development of a technology capable of minimizing noise caused by the mixing frequency of any one tuner in the tuning device composed of the main tuner 100 and the sub-tuner 102 is urgently desired.

SUMMARY OF THE INVENTION The present invention is to overcome the above-mentioned problems, and in the tuning device for tuning one or more channels, one or more channels are tuned in different ways, thereby minimizing noise due to the mixed frequency for tuning of any one channel. It is an object of the present invention to provide a tuning device and method.

A tuning device according to the present invention for achieving the above object and to solve the problems of the prior art, the first tuner for receiving only a broadcast signal, tuning only the broadcast signal received through a first channel of the broadcast signal, the broadcast signal A second tuner for tuning only a broadcast signal received through a second channel among the broadcast signals, and the first tuner and the second tuner among various tuning schemes according to a frequency interval between the first and second channels. It characterized in that it comprises a control unit for controlling to tune in different tuning schemes.

In particular, when the frequency interval between the first and second channels is within a predetermined range, the first tuner is tuned by a lower super heterodyne method or an upper super heterodyne method. The second tuner may be controlled to tune in an upper super heterodyne method or a lower super heterodyne method.

In addition, the tuning method according to the present invention, the first step of checking whether the tuning of one or more channels from a broadcast signal is requested, and if the tuning of the one or more channels is requested, whether the frequency interval of the tuning requested channels are within a predetermined range The second step of checking, If the frequency interval of the channels are within a predetermined range, characterized in that it comprises a third step of tuning the one or more channels in different ways.

Particularly, in the third step, if a frequency interval of the channels is within a predetermined range, one channel is tuned by a lower super heterodyne method or an upper super heterodyne method, and the other channel is upper It is characterized by tuning in a super heterodyne mode or a lower super heterodyne mode.

The present invention allows the main tuner and the sub tuner to perform tuning in a different manner if the tuning frequency interval between the main tuner and the sub tuner is a predetermined frequency interval in the tuning device consisting of the main tuner and the sub tuner. As such, the present invention minimizes noise due to the mixing frequency of either tuner.

The configuration of the tuning apparatus according to the preferred embodiment of the present invention will be described with reference to FIG.

The tuning device includes a main tuner 204 and a sub-tuner 212, and the control unit 200 controls the main tuner 204 and the sub-tuner 212 according to an exemplary embodiment of the present invention.

The main tuner 204 tunes the tuning channel according to the control of the control unit 200, and in particular, according to the preferred embodiment of the present invention, the upper super super according to the frequency interval of the tuning channels of the main tuner 204 and the sub-tuner 212. Tuning is performed in a super super heterodyne or a lower super heterodyne manner.

The main tuner 202 receives a broadcast signal received through an antenna, not shown, and mixes the mixed frequency from the first OSC 206 according to a tuning method under the control of the controller 200 to output the IF signal. From the first frequency mixing unit 208 and the first OSC 206 and the first frequency mixing unit 208 to generate a mixing frequency under the control of the control unit 200 to provide to the first frequency mixing unit 208 And a first IF amplifier 210 for amplifying and outputting the output IF signal.

The sub-tuner 212 tunes a tuning channel according to the control of the controller 200, and in particular, the sub-tuner 212 according to the preferred embodiment of the present invention, the upper tuner according to the frequency interval of the tuning channels of the main tuner 204 and the sub-tuner 212. Tuning is performed in a super super heterodyne or a lower super heterodyne manner.

The sub-tuner 212 receives the broadcast signal through the main tuner 202, mixes the mixed frequency from the first OSC 206 according to the tuning method under the control of the control unit 200 and outputs it as an IF signal. The second frequency mixer 216 and the second frequency mixer 216 to generate a mixed frequency under the control of the control unit 200 and provide it to the second frequency mixer 216, the output from the second frequency mixer 216 And a second IF amplifier 218 for amplifying and outputting the IF signal.

The operation of the above-described tuning device will be described with reference to the flowchart of FIG. 4.

The controller 200 checks whether it is in a PIC (PICTURE IN PICTURE) mode for displaying two images (step 300). In the PIP mode, the control unit 200 checks whether it is a TV / TV PIP mode in which two television broadcasting channels should be tuned (step 302).

In the TV / TV PIP mode, the control unit 200 determines that the tuning frequency of the main tuner 204 is the subtuner among the frequencies of the two television broadcasting channels, that is, the tuning channels of the main tuner 204 and the subtuner 212. It is checked whether it is smaller than the tuning frequency of 212 (step 304).

If the tuning frequency of the main tuner 204 is less than the tuning frequency of the sub-tuner 212, the control unit 200 determines that the frequency interval between the tuning channels of the main tuner 204 and the sub-tuner 212 is a predetermined frequency range, In other words, it is checked whether the signal belongs to the frequency range obtained by adding the predetermined frequency to the frequency of the IF signal (step 306). The predetermined frequency range may be determined as 39 [MHz] + 8 [MHz].

If the frequency intervals of the tuning channels belong to a predetermined frequency range, the controller 200 controls the main tuner 204 and the subtuner 212 to perform tuning in different tuning methods (step 308).

More specifically, the control unit 200 outputs a frequency obtained by subtracting the IF frequency from the frequency of the channel to be tuned as a mixed frequency so that the main tuner 204 can be tuned according to the lower super heterodyne scheme. And control the first frequency mixer 208 to subtract the mixed frequency from the broadcast signal.

The control unit 200 controls the second OSC 214 to generate a mixed frequency of the frequency of the channel to be tuned plus the IF frequency so that the sub-tuner 212 can be tuned according to the upper super heterodyne scheme. The first frequency mixer 208 controls the broadcast signal to be subtracted from the mixed frequency.

A tuning example according to the present invention described above will be described with reference to FIG.

If the frequency of the channel to be tuned by the main tuner 204 is 152.75, and the frequency of the channel to be tuned by the sub-tuner 212 is 192 [MHz], the frequency interval of the two channels belongs to 47 [MHz]. In this case, the main tuner 204 performs tuning at a mixed frequency of 152.75 [MHz] according to the lower super heterodyne scheme, and the subtuner 212 at a mixed frequency of 231 [MHz] according to the upper super heterodyne scheme. Since the tuning is performed, the mixed frequencies of the main tuner 204 and the subtuner 212 do not affect the frequencies of the channels to which the main tuner 204 and the subtuner 212 attempt to tune. Accordingly, the noise introduced into the broadcast signal of the channels to be tuned by the main tuner 204 and the sub tuner 212 is minimized by the mixed frequencies of the main tuner 204 and the sub tuner 212.

As described above, the present invention allows the main tuner and the sub-tuner to perform tuning in a different manner if the tuning frequency interval between the main tuner and the sub tuner is a predetermined frequency interval in the tuning device consisting of the main tuner and the sub tuner.

In the above-described preferred embodiment of the present invention, when the tuning frequency of the main tuner is smaller than the tuning frequency of the sub-tuner and the difference between the two frequencies falls within the frequency range obtained by adding a predetermined frequency to the frequency of the IF signal, the main tuner is a lower super heterodyne. Tuning was performed according to the method, and the sub-tuner was tuned according to the upper super heterodyne method.

However, unlike the above, even if the tuning frequency of the main tuner is larger than the tuning frequency of the sub-tuner and the difference between the two frequencies falls within the frequency range obtained by adding a predetermined frequency to the frequency of the IF signal, noise due to the mixed frequency may be caused. In this case, the main tuner may perform tuning according to the upper super heterodyne scheme, and the subtuner may be tuned according to the lower super heterodyne scheme, which will be apparent to those skilled in the art by the preferred embodiment of the present invention. The description of the embodiment is omitted.

As described above, the present invention has the effect of minimizing noise due to the mixed frequency of any one tuner by performing the tuning in a different manner in the tuning device composed of the main tuner and the sub tuner. .

In addition, the present invention, if the tuning frequency interval of the main tuner and the sub-tuner in the tuning device consisting of the main tuner and the sub-tuner is a predetermined frequency interval, the main tuner and the sub-tuner to perform the tuning in a different manner, mixing any one tuner There is an effect that can minimize the noise caused by the frequency.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible.

Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

Claims (7)

A tuning device for tuning one or more channels from a broadcast signal, A first tuner that receives the broadcast signal and tunes only a broadcast signal received through a first channel among the broadcast signals A second tuner that receives the broadcast signal and tunes only a broadcast signal received through a second channel among the broadcast signals A control unit for controlling the first tuner and the second tuner to tune to different tuning schemes among various tuning schemes according to the frequency interval between the first and second channels Tuning device comprising a. The method of claim 1, wherein the control unit, If the frequency interval between the first and second channels is in the frequency range of the frequency of the IF signal plus a predetermined frequency, the first tuner is a lower super heterodyne (LOWER SUPER HETERODYNE) scheme or upper super heterodyne (UPPER SUPER HETERODYNE) The second tuner is controlled to tune in the upper super heterodyne method or the lower super heterodyne method. The method of claim 1, The first tuner, A first OSC generating a first mixed frequency according to a control signal of the controller; A first frequency mixer configured to receive the broadcast signal and mix the mixed frequency generated from the first OSC according to a corresponding tuning method to tune the broadcast signal and the first channel, The second tuner, A second OSC generating a second mixed frequency according to a control signal of the controller; And a second frequency mixer configured to receive the broadcast signal and mix the mixed frequency generated from the second OSC according to a corresponding tuning method to tune the broadcast signal and the second channel. The method of claim 2, The lower super heterodyne scheme subtracts a first mixed frequency from the broadcast signal to move a broadcast signal received through the first channel to an IF frequency region. And the upper super heterodyne scheme subtracts the broadcast signal at a second mixed frequency to move the broadcast signal received through the second channel to an IF frequency domain. In the tuning method of the tuner device for tuning one or more channels from the broadcast signal, Checking whether at least one channel tuning is requested from the broadcast signal; A second step of checking frequency intervals of the tune-requested channels when the one or more channel tuning is requested A third step of tuning the one or more channels in different tuning schemes according to the frequency intervals of the checked channels; Tuning method comprising a. The method of claim 5, wherein the third step If the frequency interval of the tune-requested channels is within a frequency range obtained by adding a predetermined frequency to the frequency band of the IF signal, one channel is in a lower super heterodyne method or an upper super heterodyne method. And the other channel is tuned in the upper super heterodyne or lower super heterodyne manner. The method of claim 6, The lower super heterodyne scheme subtracts a first mixed frequency from the broadcast signal to move a broadcast signal received on a first channel to an IF frequency region. And wherein the upper super heterodyne scheme subtracts the broadcast signal from the second mixed frequency and moves the broadcast signal received through the second channel to the IF frequency domain.

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