KR20050067877A - A mobile terminal capable of reproducing a television signal or a fm radio signal - Google Patents

Abstract

The present invention relates to a mobile communication terminal capable of watching TV and receiving FM radio.

The mobile communication terminal according to the present invention first demodulates a TV signal or an FM radio signal received from an antenna in a common RF terminal, and then selectively processes the TV signal or the FM intermediate frequency processor according to the selection control of the system controller. And a broadcast receiver for outputting demodulated video and audio signals, and a signal processor for processing the video signal output from the broadcast receiver and outputting the video signal to a display.

Description

A mobile terminal capable of reproducing a television signal or a FM radio signal

The present invention relates to a mobile communication terminal, and more particularly to a mobile communication terminal capable of receiving TV and FM radio.

With the expansion of mobile communication terminals, technology in this field is developing. Due to consumer demand and competition among companies, various functions are being added every day.

Terminals equipped with cameras have become popular enough to occupy a large part of terminals that are newly introduced in recent years. In addition, recently, a mobile communication terminal with a TV viewing function has been released. Along with the increase in memory capacity, this trend is accelerating the personalization of multimedia devices.

It is generally known that the TV signal and the FM radio signal have similar frequency bands, so that the TV receiver can listen to the FM radio signal. However, there is a problem that only the antenna is shared, so that the switching of signals is performed at the RF stage, thereby reducing the reception sensitivity by the loss of the RF switch.

On the other hand, in a terminal with emphasis on portability, implementing such a large number of functions requires not only a physical problem of securing a necessary space in the terminal but also an efficient architecture for proper control between systems. Moreover, designing a new system architecture every time has been very inefficient in terms of cost and time due to the frequently added features.

The present invention is derived from this background, and aims to improve the sensitivity in a mobile communication terminal capable of receiving a TV signal and an FM radio signal.

Furthermore, an object of the present invention is to reduce the number of parts in a mobile communication terminal capable of receiving a TV signal and an FM radio signal, thereby saving space and lowering manufacturing costs.

Furthermore, an object of the present invention is to propose a compact system architecture that enables unified and systematic control between modules in a terminal.

It is further an object of the present invention to present a system architecture that is easy to design upon addition of new functional modules.

According to an aspect of the present invention, a mobile terminal according to an aspect of the present invention first demodulates a TV signal or an FM radio signal received from an antenna in a common RF stage, and then, according to a user's selection command, the TV intermediate frequency processor or the FM intermediate. The frequency processing unit may selectively process the output demodulated video signal and audio signal.

According to this aspect of the present invention, the mobile terminal according to the present invention demodulates the received broadcast signal using the same circuit in the RF stage, and switches the reception sensitivity by switching in the intermediate frequency processing stage having a low influence on the sensitivity. There is an advantage not to drop. Furthermore, the mobile communication terminal according to the present invention has the advantage of saving the space and reducing the manufacturing cost by reducing the number of components by common to the RF circuit stage.

Furthermore, the mobile communication terminal according to an additional aspect of the present invention is characterized in that the internal signal processing unit controls various functions of the broadcast receiving module by the serial bus, and the video signal of the broadcast receiving module is input to the signal processing unit through the media interface. do.

According to this aspect of the present invention, the mobile communication terminal according to the present invention is capable of uniform control of the modules constituting the entire system, and furthermore, simply by incorporating another module such as a camera module into the bus. As a result, the hardware design becomes very simple, and in addition, it is possible to present a standard basic structure in software design.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

1 is a block diagram schematically showing the configuration of a mobile communication terminal according to an embodiment of the present invention. As shown, the mobile communication terminal according to the present embodiment includes a phone control unit 100 and its subcircuits, a broadcast receiving unit 700 and a signal processing unit 300, which are largely common to existing mobile communication terminals. It is composed.

The accessory circuits include a keypad 250, a display unit 270 for displaying a menu and an operation state, a wireless communication unit 230 for extracting voice and data signals from a wireless signal transmitted and received through an antenna, and a voice call signal from the wireless communication unit. It includes a voice input and output circuit 210 for inputting and outputting through a microphone and a speaker.

The keypad 250 and the display unit 270, for example, a liquid crystal display, may be one of well-known configurations. In addition, the wireless communication unit 230 is configured to include an antenna and RF circuit for communication with the base station. In the present specification, the wireless communication unit is interpreted to cover not only various versions of CDMA but also existing methods such as cellular, GSM, and W-CDMA, as well as mobile communication. The voice input / output circuit 210 processes a conversion of digital voice data into an analog voice signal or vice versa, and has a known configuration including an additional circuit such as an audio amplification circuit or a filter.

The phone controller 100 includes a communication processor 110 for controlling voice and data communication, and a system controller 130 for controlling the entire system according to an operation signal or an operation state input from a keypad. The baseband processing portions of the phone control unit 100 and the wireless communication unit 230 are commercially provided as a single integrated circuit, for example, in the case of the CDMA method, such as the Qualcomm MSM series chip. These integrated circuits include dedicated hardware for processing communications, digital signal processors and core firmware for processing video compression, Bluetooth communications, GPS, etc., which are basically provided for the signal processors, and further, microcontrollers for system control. The processor is built in. The system controller 130 supports a convenient application environment such as a virtual machine, and can process various controls according to a characteristic aspect of the present invention by a program.

The system controller 130 may interface with and control external ICs through a serial bus such as an I ² C bus. When an operation command is input from the user through the operation unit or an event such as a call reception occurs, the system controller 130 issues a necessary control command.

The mobile communication terminal according to an embodiment processes a broadcast receiver 700 for extracting and outputting an audio signal and a video signal from a TV signal or an FM radio signal received over the air, and processes the video signal output from the broadcast receiver 700. A signal processor 300 outputs the display unit 270 and an audio output unit 220 outputs an audio signal output from the broadcast receiver.

According to a characteristic aspect of the present invention, the broadcast receiving unit 700 first demodulates a TV signal or an FM radio signal received from an antenna in a common RF stage, and then the TV intermediate frequency processor or the FM intermediate frequency processor according to the selection control of the system controller. Selectively outputs the demodulated image signal to the signal processor 300 and outputs the demodulated TV or radio audio signal to the audio output unit 220. The video signal is decoded and output in a digital form, and the audio signal is output as an analog signal and amplified by the audio output unit. The audio output unit 220 selectively outputs various reproduction sounds such as a ring tone reproduction circuit in the terminal under the control of the system controller 130.

In the present embodiment, the broadcast receiving unit 700 and the signal processing unit 300 are also provided in a single package. The broadcast receiving unit 700 is configured as a package including several IC modules therein. The signal processor 300 includes a single IC package or a digital signal processor, internal memories, interface modules, and a microprocessor.

Hereinafter, a mobile communication terminal according to an embodiment will be described in more detail with reference to FIG. 2. 2 is a block diagram illustrating the embodiment of FIG. 1 in more detail. As shown, the broadcast receiver includes a tuner 710 and a decoder 730 for decoding a video signal output from the tuner 710 and outputting the video signal in a reference format.

In one embodiment, the broadcast receiving unit 700 includes a tuner unit 710 for demodulating the radio broadcast signal received from the antenna, a decoder unit 730 for decoding the demodulated broadcast signal and outputting the digital data, and from the outside. The reception control unit 750 for controlling the operation according to the control command signal of the. The broadcast receiving unit 700 includes an antenna for receiving an air wave signal. This antenna may exist separately from the antenna for mobile communication, or in the case of a strip patch antenna type, may be physically shared as one antenna.

According to a characteristic aspect of the present invention, the mobile communication terminal further includes an audio output unit 220 for outputting an audio signal output from the broadcast receiving unit 700 as an audible sound, and the broadcast receiving unit 700 at the tuner unit 710. The apparatus may further include an audio processor 790 which processes the output audio data and outputs the audio data to the audio output unit 220. At this time, the audio signal of the television signal demodulated by the tuner unit 710 is directly supplied to the audio output unit 220 in analog form. The image data may be processed by the signal processor 300 to be transmitted to an external device, and the audio output unit 220 may include a delay circuit for delaying the output audio signal in consideration of a delay required for playback on the external device.

The tuner unit 710 may be one of the existing analog broadcast tuners such as NTSC and PAL, or a common tuner that supports all of them. In another embodiment, the tuner 710 may be a multimedia broadcasting for mobile communication, such as a satellite based digital multimedia broadcasting (DMB) scheme or a wireless LAN based multimedia broadcasting.

As shown, the signal processor 300 may include a media interface 353 that receives an image signal from the broadcast receiver 700, an image processor 321 that processes a Youngshin signal input from the media interface 353. Converting the image signal processed by the image processor 321 into display data and outputting the image signal to the display unit 270; and converting the image signal processed by the image processor 321 into a digital image data format. The external device interface unit 357 outputs to the interface port 240.

The signal processing unit 300 was originally developed by the present applicant for signal processing of a camera phone, and according to the characteristic structure of the present invention, the signal processing unit 300 was also adopted as it is without any special structural change. In addition, it is a characteristic advantage of the present invention that the existing signal processing unit 300 for the camera unit 500 can be used in common without adding a separate signal processing module for the broadcast receiving unit 700.

The media interface unit 355 receives 8-bit image data in YUV format and buffers it in the internal memory. The image processor 321 converts the progressive scan type TV signals into a sequential scan method, and scales them by interpolation and / or decimation processing to match the resolution of the display device. A codec is included for storing or decompressing image data. In one embodiment, the codec includes an MPEG encoder / decoder and a JPEG encoder / decoder for compressing, storing and reading the captured image frame as a still image. These are implemented by the DSP and the core. In addition, the image processor 321 may include a sharpness enhancement circuit for improving image quality, and a contrast and contrast control function. You can even include some simple filter functions to give you graphical effects.

In an exemplary embodiment, the image output unit 323 outputs the image data output directly from the media interface unit 355 or from the image processing unit 321 to the display unit 270 in a 16-bit RGB data format. In the present exemplary embodiment, the image received by the broadcast receiving unit 700 may be compressed by the image processing unit 321 in an MPEG manner and stored in an internal mass memory (not shown).

According to a characteristic aspect of the present invention, the signal processor 300 controls the operation of the TV receiver 700 by using a serial bus. In one embodiment, the serial bus is an I ² C bus. Also called Inter-IC, I ² C is a two-wire, bidirectional serial bus that provides a communication link between integrated circuits. Philips introduced the I ² C bus 20 years ago for mass production products such as TVs, VCRs and audio equipment.

In the present invention, the video signal inside the terminal is distributed on the bus in a single format, which in one embodiment is the YUV format. Therefore, each image processing module converts the internal output into YUV format and outputs the internal input.

Hereinafter, a control configuration of the broadcast receiving unit 700 of the signal processing unit 300 serving as a host in media signal processing will be described in detail. According to a characteristic aspect of the present invention, the broadcast receiving unit 700 operates according to a bus interface unit 773 for receiving a serial bus control signal from the signal processing unit 300 and a control signal received from the bus interface unit 773. It includes a reception control unit 750 for controlling.

According to a characteristic aspect of the present invention, the signal processor 300 may include a media interface 355 that receives an image signal from the broadcast receiver 700, and a bus interface 353 that controls an operation of the broadcast receiver 700. And a controller 310 for controlling an external module through the bus interface 353. The signal processor 300 selectively activates the broadcast receiver 700 by known chip select logic.

At this time, according to an additional aspect, the control unit 310 of the signal processing unit 300 may separately access the tuner unit 710 and the decoder unit 730 of the broadcast receiving unit 700 by assigning a plurality of addresses to the bus interface unit 353. To control.

Once a module is selected by the chip select logic, the control unit 310 of the signal processing unit 300 sets the operating environment of these modules through the bus interface unit 353 or maintains the bus interface unit 353 even during operation. Control the operation of each module. In one embodiment, the communication interface of the bus interface portions 353, 573, 773 is an I ² C bus. In the broadcast receiving unit 700, one address may be allocated to each of TV / FM radio selection, channel selection, audio output level, and decoder operation. The control unit 310 records control commands to these addresses through the bus interface unit 353 to select TV viewing and listening to FM radio, to change TV channels or radio channels, to adjust the volume, or to output the output image. You can control the behavior of changing formats.

However, the present invention is not limited thereto. For example, when the I ² C bus control is supported in the phone control unit 100, the phone control unit 100 controls the various operations of the broadcast receiving unit and the operation of the signal processing unit 300. You may. In this case, the phone controller 100 operates as an I ² C bus host, and the bus interface 353 of the signal processor 300 and the bus interface 773 of the broadcast receiver 700 operate as an I ² C slave. .

The signal processor 300 according to the present invention includes a chip select logic and a bus interface 353 and has a very flexible design scheme. Therefore, for example, by simply adding a camera module designed to output image data in YUV format supported by the media interface unit 355, the camera can be expanded to a phone capable of simultaneously shooting and watching TV.

3 illustrates one embodiment of a tuner portion 710 according to a characteristic aspect of the present invention. In the illustrated embodiment, the wireless broadcast signal received from the antenna is separated into signals of the UHF band and signals of the VHF band, respectively, through the UHF filter 711 and the VHF filter 712. Signals in each band are filtered through their respective Low Noise Amplifiers (713, 714). The filtered signal is supplied to the PLL IC 717 to select a signal for each channel according to a channel tuning command, mixed with a local oscillator, and demodulated into an intermediate frequency signal. At this time, the local oscillation frequency for each signal is supplied from a voltage controlled oscillator (715, 716) for each band. The oscillation frequencies of these oscillators are controlled by the TV control unit 750 of FIG. 2 which controls channel tuning.

According to a characteristic aspect of the present invention, the tuner unit 710 selectively supplies a TV intermediate frequency (IF) signal and an FM intermediate frequency signal output from the RF demodulation unit 800 to the intermediate frequency signal processor 725. A frequency (IF) switch 721.

In addition, an image intermediate frequency (VIF) amplifier for amplifying the TV intermediate frequency signal of the intermediate frequency switch 721, an image intermediate frequency filter for filtering the output of the image intermediate frequency amplifier and supplying the intermediate frequency signal processing unit; And an FM intermediate frequency (AIF) amplifier for amplifying the FM intermediate frequency signal of the intermediate frequency switch, and an FM intermediate frequency filter for filtering the output of the FM intermediate frequency amplifier and supplying the intermediate frequency (IF) signal processor.

The first demodulated intermediate frequency signal is supplied to an intermediate frequency (IF) switch 721. The IF switch 721 switches the input intermediate frequency signal to the VIF amplifier 722 in the TV broadcast reception mode under the control of the reception control unit 750 of FIG. 2, and inputs the intermediate frequency signal in the FM broadcast reception mode. Is switched to the AIF amplifier 723 and supplied. These are supplied to the IF signal processing unit 725 through the respective intermediate frequency amplifiers 722 and 723 and the intermediate frequency filters 724 and 725.

The supplied intermediate frequency signal is second demodulated by the IF signal processor 725 and output to the video output unit 726 and the audio output unit 727 as analog video signals and audio signals, respectively. In this case, the TV voice output and the radio voice output are mixed in the IF signal processor 725 and output to the voice output unit 727. In this case, the IF signal processor is controlled by the TV controller 750 of FIG. 2 to control channel tuning. In addition, the output level, ie, volume, of the audio output unit 727 is controlled by the TV control unit 750 of FIG. 2.

In one embodiment, the decoder 730 generates and outputs a digital YUV signal from the analog video output of the video output unit 726. The operation of the decoder unit is controlled by the reception controller 750.

4 is a block diagram illustrating in more detail the configuration of the IF signal processor 725 of FIG. 3. As shown, the IF signal processor 725 is a TV intermediate frequency signal processor for outputting an image signal and an audio signal by intermediate frequency demodulation of the TV intermediate frequency (IF) signal output from the RF demodulator 800, and the RF demodulation. FM intermediate frequency signal processing unit for demodulating the FM intermediate frequency signal output from the grandfather to output a voice signal, and a voice output unit for outputting the output of the audio signal of the TV intermediate frequency signal processing unit or FM intermediate frequency signal processing unit 990 ).

The TV intermediate frequency signal processor includes an image preamplifier 910 for preamplifying and receiving an image IF signal, a VIF phase locked loop (PLL) unit 930 for demodulating the preamplified image IF signal into a baseband signal, and demodulation. And a voice trap unit 970 which extracts a voice signal from the received signal and supplies the extracted voice signal to the voice output unit 990. The VIF PLL 930 outputs a control signal to the FM IF AGC (Automatic Gain Controller) 950 that automatically adjusts the gain of the preamplifier.

The FM intermediate frequency signal processor includes an FM preamplifier 920 for preamplifying and receiving an FM IF signal, a FM IF phase locked loop (940) for demodulating the preamplified FM IF signal into a baseband signal, The FM narrowband demodulator 980 extracts a speech signal from the baseband signal through FM demodulation and supplies the extracted speech signal to the speech output unit 990. The FM IF PLL 940 outputs a control signal to an FM IF AGC (Automatic Gain Controller) 940 that automatically adjusts the gain of the preamplifier 920.

As described in detail above, the mobile communication terminal according to the present invention has a merit of adopting a single antenna and an RF band circuit, which enables TV signal reception and FM radio reception, thereby saving space and reducing manufacturing costs.

Furthermore, the mobile communication terminal according to the present invention has a better sensitivity than the conventional scheme by switching the TV IF signal and the FM IF signal in the intermediate frequency stage without switching the TV signal and the FM signal in the RF stage.

Furthermore, the terminal according to the present invention has a bus for controlling operation separately from the image processing path, and thus can control the complicated modules uniformly, so that the system design, the function addition, and the design change can be easily performed.

The present invention has been described above with reference to preferred embodiments, but is not limited thereto, and is interpreted by the appended claims, which are intended to cover many variations that will be apparent to those skilled in the art without departing from the scope of the present invention. Should be done.

1 is a block diagram schematically showing the configuration of a mobile communication terminal according to an embodiment of the present invention.

2 is a block diagram illustrating the embodiment of FIG. 1 in more detail.

3 shows an embodiment of the tuner portion 710 in detail.

4 illustrates an embodiment of the intermediate frequency signal processor of FIG. 3 in detail.

<Description of the symbols for the main parts of the drawings>

100: phone control unit 110: communication control unit

130: system control unit 210: voice input and output circuit

220: audio output unit 230: wireless communication unit

250: keypad 270: display unit

300: signal processor 310: controller

321: image processing unit 323: image output unit

353: bus interface unit 355: media interface unit

700: broadcast receiving unit 710: tuner unit

750: reception control unit 773: bus interface unit

790: audio processing unit

800: RF demodulator 717: PLL

725: IF signal processor

Claims (13)

A keypad; A display unit for displaying a menu and an operation state; A wireless communication unit for extracting a voice and data signal from a wireless signal transmitted and received through an antenna; A voice input / output circuit for inputting and outputting a voice call signal from the wireless communication unit through a microphone and a speaker; A phone control unit including a communication processing unit for controlling voice and data communication, and a system control unit for controlling the entire system according to an operation signal or an operation state input from the keypad; First demodulation of the TV signal or FM radio signal received from the antenna in a common RF stage, and then selectively processed by the TV intermediate frequency processor or the FM intermediate frequency processor according to the selection control of the system controller to demodulate the video and audio signals. A broadcast receiver for outputting, A signal processor which processes an image signal output from the broadcast receiver and outputs the image signal to the display unit; Mobile communication terminal comprising a. The apparatus of claim 1, wherein the broadcast receiving unit comprises a tuner unit and a decoder unit for decoding a video signal output from the tuner unit and outputting the decoded video signal in a reference format. The tuner unit: An RF demodulator for demodulating the radio broadcast signal received from the antenna into a TV intermediate frequency signal or an FM intermediate frequency signal according to selection control of the system controller; The TV intermediate frequency signal processor outputs the video signal and the audio signal by demodulating the intermediate TV frequency signal output from the RF demodulator and the FM intermediate frequency signal output from the RF demodulator. And an intermediate frequency signal processor including an FM intermediate frequency signal processor for outputting a voice signal and a voice output unit for outputting a voice signal of the TV intermediate frequency signal processor or the FM intermediate frequency signal processor. The method of claim 2, wherein the tuner portion: And an intermediate frequency switch for selectively supplying a TV intermediate frequency (IF) signal and an FM intermediate frequency signal output from the RF demodulator to the intermediate frequency signal processor. 4. The apparatus of claim 3, wherein the tuner portion is: An image intermediate frequency (VIF) amplifier for amplifying the TV intermediate frequency signal of the intermediate frequency switch, an image intermediate frequency filter for filtering an output of the image intermediate frequency amplifier, and supplying the intermediate frequency signal to the intermediate frequency signal processor; And an FM intermediate frequency amplifier for amplifying an FM intermediate frequency signal, and an FM intermediate frequency filter for filtering an output of the FM intermediate frequency amplifier and supplying the intermediate frequency (IF) signal processor. The signal processor of claim 1, wherein the signal processor comprises: A media interface for receiving an image signal from the broadcast receiving unit, an image processing unit for processing a Youngshin signal input from the media interface unit, and an image for converting the image signal processed by the image processing unit into display data and outputting it to a display unit. A mobile communication terminal comprising an output unit. The method of claim 5, wherein the signal processing unit: And a bus interface unit for outputting a serial bus control signal for controlling an operation of the broadcast receiving unit. The method of claim 6, wherein the broadcast receiver: And a bus interface unit for receiving a serial bus control signal from a system controller of the signal processor or the phone controller, and a reception controller for controlling the overall operation of the broadcast receiver according to the control signal received from the bus interface unit. Characterized in a mobile communication terminal. 8. The mobile communication terminal of claim 7, wherein the serial bus control signal received by the bus interface unit from the system control unit comprises a TV / FM broadcast selection command. 9. A mobile communication terminal according to any one of claims 6, 7, and 8, wherein the serial bus is an I ² C bus. The mobile communication terminal according to any one of claims 1 to 4, wherein the broadcast receiver supports either of the NTSC and PAL schemes or both. The mobile communication terminal according to any one of claims 1 to 4, wherein the broadcast receiving unit is a DMB system. The mobile communication terminal of claim 7, wherein the control unit of the signal processing unit controls the bus interface unit to individually access the tuner unit and the decoder unit of the broadcast receiving unit by a plurality of address assignments. The mobile communication terminal of claim 2, wherein the terminal further comprises an audio output unit configured to output an audio signal output from the voice output unit of the broadcast receiver as an audible sound.