Patent Application
20070253354
The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same reference numerals are used for designating the same elements in the accompanying drawings.
The automatic matching unit 180 has at least one capacitor bank, and the capacitor bank forms a structure in which a plurality (n) of capacitors are connected to one another.
The values of the capacitors (C) included in the capacitor bank are sequentially increased as values of C/2, C/4, C/8, . . . , C/2n, and each of the capacitors (C) is connected to a switch so as to have 1 or 0 when the switch is turned on/off. Further, the total sum value of the capacitors (C) when the switch is turned on is “Ctotal=0*C/2+1*C/4+0*C/8+ . . . +1*C/2n”. For example, if one capacitor bank forms a structure in which 8 capacitors (C) are connected to one another, the one capacitor bank may have 28, i.e., values of 256 capacitors (C). It will be recognized that operation of the switch(es) will allow for a plurality of other total sum capacitive values.
Therefore, the automatic matching unit 180 extracts the value of a capacitor (C) for resonating at a frequency band corresponding to each channel among the values of a plurality of capacitors (C) included in at least one capacitor bank under the control of a control unit 110 and then allows a switch to be turned on/off, so that the total sum value of the capacitors (C) is modified. The automatic matching unit 180 changes an electrical length of an antenna through the modified value of the capacitor (C) so that it functions to resonate at a frequency band corresponding to each channel.
A DMB reception unit 170 functions to output a DMB signal of a correspondent channel, which is received through the frequency band resonated by the automatic matching unit 180.
The DMB reception unit 170 comprises a tuner, a DMB processor and a codec. The tuner receives a DMB signal of a correspondent channel through the frequency band resonated by the automatic matching unit 180 under the control of the control unit 110 and functions to convert the frequency of the received DMB signal. The DMB processor demodulates the DMB signal received from the tuner under a control of the control unit 110 and separates audio and video signals from the demodulated DMB signal to perform the decoding. The codec decodes the audio and video signals separated and received from the DMB processor into an MPEG-standard signal under a control of the control unit 110 so as to control the decoded audio and video signals to be respectively output to a speaker through an audio processor and a display through a video processor.
The control unit 110 also functions to control the general operation of a wireless terminal. Further, if a channel is selected by a user in a DMB mode according to the present invention, the control unit 110 controls the automatic matching unit 180 to resonate at a frequency band corresponding to the selected channel.
Furthermore, the control unit 110 controls a DMB signal corresponding to the selected channel received through the frequency band resonated by the automatic matching unit 180 to be output through the DMB reception unit 170 according to the present invention.
An operation of receiving a DMB signal corresponding to each channel in a wireless terminal as described above will be described in detail with reference to
Referring to
An operation of the automatic matching unit 180 resonating at a frequency band corresponding to the selected channel will now be discussed. The automatic matching unit 180 the value for moving a resonance point to the frequency band corresponding to the selected channel among the values of a plurality of capacitors (C) included in the automatic matching unit 180 and allows the switch to be turned on/off so that the value of the capacitor (C) is modified at step 203.
The automatic matching unit 180 changes the electrical length of an antenna through the modified value of the capacitor (C) so that it resonates at the frequency band that corresponds to the selected channel at step 204.
If the automatic matching unit 180 resonates at the frequency band corresponding to the selected channel at step 204, the control unit 110 outputs a DMB signal corresponding to the selected channel received through the resonated frequency band to the DMB reception unit 170. The DMB reception unit 170 receives the DMB signal corresponding to the selected channel to demodulate, decode and then output it under a control of the control unit 110 at step 205.
For example, if channel 8 is selected in a DMB mode of the wireless terminal, the automatic matching unit 180 resonates at a frequency band of 180 to 186 MHz corresponding to channel 8 under a control of the control unit 110.
The control unit 110 controls a DMB signal corresponding to channel 8, which is received through the resonated frequency band to be output through the DMB reception unit 170, as shown in
Further, if channel 12 is selected in a DMB mode of the wireless terminal, the automatic matching unit 180 resonates at a frequency band of 204 to 210 MHz corresponding to channel 12 under a control of the control unit 110.
The control unit 110 controls a DMB signal corresponding to channel 12, which is received through the resonated frequency band to be output through the DMB reception unit 170, as shown in
In
As described above, the present invention has an advantage in that there is provided a device and a method for receiving a digital multimedia broadcasting signal in a wireless terminal, which can receive a DMB signal corresponding to each channel so that DMB signals of all the channels can be received to allow the mobile terminal user to see and hear a broader range of Broadcast Multimedia content.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2006-38723 | Apr 2006 | KR | national |
