JP4551876B2 - Analog / digital television receiver - Google Patents

Description

  The present invention relates to a receiver capable of viewing analog broadcasting and digital broadcasting, and more particularly to a receiver capable of displaying two screens.

  Some television receivers include an analog tuner and a digital tuner. As shown in FIG. 5, such a television receiver X includes an antenna 101, an analog input 103a, a through-out 103b, a digital input 107a, an analog tuner 103, a digital tuner 107, and an analog signal. The processing unit 105, the digital signal processing unit 111, the video signal processing unit 115, the image display unit 117, the audio reproduction unit 121, and the control unit 123 are included.

Currently, it is a transition period from analog broadcasting to digital broadcasting, and television receivers that can view analog broadcasting and digital broadcasting on, for example, two screens are provided. In general, in order to realize a two-screen display with a broadcast wave even after an analog broadcast is stopped, as shown in FIG. 5, it can be handled by having two digital broadcast receiving circuits. As a related technique, a technique for providing an in-vehicle communication device capable of preventing communication failure in either narrow area communication or wide area communication has been proposed (see Patent Document 1).
JP 2004-248140 A

  However, in the method having two digital broadcast receiving circuits, the analog broadcast cannot be viewed after the analog broadcast wave is stopped. Therefore, when the television receiver displays two channels of digital broadcast and analog broadcast on two screens, analog broadcast cannot be displayed. Also, when analog broadcast is output from the recording output terminal, no video is output because the analog broadcast is not broadcast. As a television, there is a problem that a function that has been conventionally used such as a two-screen display and a recording output cannot be used, which is a great disadvantage for a user.

  FIG. 6 is a diagram showing a two-screen display before and after the analog broadcast wave is stopped in the apparatus shown in FIG. As shown in FIG. 6A, an analog broadcast display 133 and a digital broadcast display 135 are displayed on the screen 131. After the analog broadcast wave is stopped, the digital broadcast display 135a is displayed, but the analog broadcast display 133a is not displayed. In addition, as shown in FIG. 6B, with respect to the recording output, any analog broadcast output is possible during analog broadcast viewing, and any analog broadcast output is possible during digital broadcast viewing. After the analog broadcast wave is stopped, only the digital broadcast viewing program can be output, and the analog broadcast becomes impossible.

  An object of the present invention is to provide a technique that enables two-screen display and recording output even after an analog broadcast wave is stopped.

  According to the present invention, after the analog broadcast is stopped in the television set, the function of converting the received digital broadcast wave to the analog broadcast wave, and means for inputting the broadcast wave separately from the broadcast wave input from the conventional antenna line; An analog broadcast tuner having broadcast wave switching means is provided at the front stage of the broadcast wave input.

  According to one aspect of the present invention, there is provided an analog / digital television receiver including an analog tuner and an analog signal processing unit, a digital tuner and a digital signal processing unit, and capable of displaying at least two screens of analog and digital. A waveform / frequency conversion unit for converting a waveform and frequency of a digital input, and an analog input is directly input to the analog tuner and output to the analog signal processing unit, or the waveform / frequency conversion There is provided an analog / digital television receiver having a changeover switch for switching whether to output to the analog signal processing unit via the unit.

  The change-over switch switches whether to perform conventional processing or to output an analog signal to the analog signal processing unit via the waveform / frequency conversion unit.

  The waveform / frequency conversion unit preferably performs processing for converting a digital broadcast wave into an analog broadcast wave and converting the analog broadcast wave into a conventional frequency. A waveform / frequency converter converts a digital broadcast wave into an analog broadcast wave, and converts the analog broadcast wave into a conventional frequency. By generating an analog broadcast wave from a digital broadcast wave and inputting it to an analog tuner from the outside, it can be handled in the same way as a conventional analog broadcast wave even though it is a digital broadcast. Can be converted to analog and displayed on the screen.

  The waveform / frequency conversion unit preferably includes a digital broadcast wave demodulation processing unit, a decoding unit, an analog broadcast wave modulation processing unit, and a frequency conversion unit in order from the input side. Digital broadcast waves are converted to analog broadcast waves, and analog broadcast waves are converted to conventional frequencies. By generating an analog broadcast wave from a digital broadcast wave and inputting it to an analog tuner from the outside, it can be handled in the same way as a conventional analog broadcast wave even though it is a digital broadcast. Can be converted to analog and displayed on the screen. It is preferable that switching control of the switch is performed when the analog broadcasting is stopped.

  It is preferable to provide a channel conversion unit that performs conversion so that the current digital channel is assigned to the same channel as the original analog broadcast after the analog stoppage. Thereby, even after analog stoppage, user confusion regarding the channel can be prevented in advance.

  Further, as an output to another device, the digital broadcast obtained by converting the digital broadcast wave of the back program into an analog broadcast wave after the analog broadcast is stopped by switching with the changeover switch before and after the analog broadcast stop is sent to the other device. Control for output can also be performed. Before the analog broadcast is stopped, the viewing program can be output. When viewing the analog broadcast, any digital broadcast can be output. When viewing the digital broadcast, any analog broadcast can be output.

  According to the present invention, by generating an analog broadcast wave from a digital broadcast wave and inputting it from the front stage of the analog tuner, there is no need for an external device, the antenna wiring remains as it is, and after the analog broadcast is stopped, two screens are maintained as before. Display and recording output are possible. Accordingly, the commercial value as a television receiver can be maintained and used.

  An analog / digital broadcast receiver according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram showing a configuration example of an analog / digital broadcast receiver according to the present embodiment. FIG. 2 is a functional block diagram illustrating a configuration example of the waveform / frequency conversion unit in FIG. FIG. 3 is an image diagram of display and recording output according to the present embodiment, and shows an example before and after analog broadcasting is stopped. FIG. 4 is a diagram showing how channels are converted before and after analog broadcasting stops.

  As shown in FIG. 1, the television receiver A according to the present embodiment includes an antenna 1, an analog input 3a, a through-out 3b, a digital input 7a, an analog tuner 3, a digital tuner 7, An analog signal processing unit 5, a digital signal processing unit 11, a video signal processing unit 15, an image display unit 17, an audio reproduction unit 21, and a control unit 23 are included. This configuration is the same as the configuration shown in FIG. However, the television receiver A according to the present embodiment is characterized in that the analog tuner 3 includes a changeover switch 2 and a waveform / frequency converter 3c.

  The changeover switch 2 performs the conventional processing shown in FIG. 5 (processing for outputting an analog signal to the analog signal processing unit 5) or converts the digital signal into the analog signal processing unit 5 via the waveform / frequency conversion unit 3c. Switch whether to output to.

  As shown in FIG. 2, the waveform / frequency conversion unit 3 c includes a digital broadcast wave demodulation processing unit 31, a decoding unit 33, an analog broadcast wave modulation processing unit 35, and a frequency conversion unit 37. The digital signal acquired from the antenna 1 is demodulated by the digital broadcast wave demodulation processing unit 31, the demodulated digital signal is decoded by the decoding unit 33, and the decoded digital signal is converted into an analog broadcast wave. The modulation processing unit 35 performs waveform modulation processing on an analog wave, and the frequency conversion unit 37 performs channel selection processing on the analog wave at the same frequency as that used in the conventional processing by the analog tuner 3. Frequency conversion is performed.

  FIG. 3 corresponds to FIG. As shown in FIG. 3A, the analog broadcast display 43 and the digital broadcast display 45 are displayed on the display screen 41 in the same manner as before, before the analog broadcast is stopped. After the analog broadcasting is stopped, the display screen 41 is changed to an analog signal having an analog waveform and a tuning frequency similar to the conventional one by the conversion performed by the waveform / frequency conversion unit 3c in FIG. It is possible to display the broadcast program as if it were converted and analog broadcasting was performed. Thereby, the analog broadcast display 43a based on the digital broadcast and the digital broadcast display 45a can be displayed in two screens.

  Also, as shown in FIG. 3B, the recording output from the TV 51 to the VCR / HDD recorder 53 or the like can output a viewing program before the analog broadcast is stopped. Digital broadcast output is possible. When viewing digital broadcast, any analog broadcast output is possible. After the analog broadcast is stopped, the recorded output can be output as a viewing program. For example, a digital broadcast TV 51a obtained by converting a digital broadcast wave of a back program into an analog broadcast wave can be output from a TV 51a to a VCR / HDD recorder 53a or the like. It becomes possible.

  In this way, after an analog broadcast is stopped, an analog broadcast wave is generated from the digital broadcast wave and input to the analog tuner from the outside, so that it can be handled in the same way as a conventional analog broadcast wave even though it is a digital broadcast. There is an advantage that two-screen display and recording output are possible.

  FIG. 4A shows a channel plan of analog in the current metropolitan area, and an upper diagram of FIG. 4B shows a current digital channel plan. After the analog stop, it is preferable to convert so that the current digital channel is assigned to the same channel as the original analog broadcast (FIG. 4A) as indicated by an arrow. As a result, there is an advantage that it is difficult to prevent user confusion regarding the channel even after the analog stoppage.

  In the above embodiment, a television receiver capable of two screens of analog and digital has been described as an example. However, in the present invention, N screen display (N is an integer of 2 or more) is possible. It goes without saying that a television receiver is also included.

  The present invention can be used for a television device capable of analog / digital two-screen display.

It is a functional block diagram which shows the example of 1 structure of the analog / digital broadcast receiver by one embodiment of this invention. FIG. 2 is a functional block diagram illustrating a configuration example of a waveform / frequency conversion unit in FIG. 1. It is an image figure of the display by this Embodiment, and a video recording output, and is a figure which shows the example before and after the analog broadcast stops. It is a figure which shows the mode of the conversion of the channel before and after analog broadcasting stops. It is a functional block diagram which shows one structural example of a general analog / digital broadcast receiver. It is an image figure of the display and recording output by the analog / digital broadcast receiver shown in FIG. 5, and is a figure which shows the example before and after the analog broadcast stops.

Explanation of symbols

A ... TV receiver, 1 ... antenna, 3 ... analog tuner, 3a ... analog input, 3b ... through-out, 3c ... waveform / frequency converter, 5 ... analog signal processor, 7 ... digital tuner, 7a ... digital 11 ... Digital signal processing unit, 15 ... Video signal processing unit, 17 ... Image display unit, 21 ... Audio reproduction unit, 23 ... Control unit, 31 ... Digital broadcast wave demodulation processing unit, 33 ... Decoding unit, 35 ... Analog broadcast wave modulation processing unit, 37... Frequency conversion unit.

Claims (5)

An analog / digital television receiver comprising an analog tuner and an analog signal processing unit, a digital tuner and a digital signal processing unit, and capable of at least two-screen display of analog and digital,
A waveform / frequency converter for converting the waveform and frequency of the digital input into the waveform and frequency of an analog broadcast wave ;
A change-over switch for switching whether analog input is directly input to the analog tuner and output to the analog signal processing unit or output to the analog signal processing unit via the waveform / frequency conversion unit; An analog / digital television receiver. The waveform / frequency conversion unit includes a digital broadcast wave demodulation processing unit, a decoding unit, an analog broadcast wave modulation processing unit, and a frequency conversion unit in order from the input side. Item 2. An analog / digital television receiver according to item 1 . 3. The analog / digital television receiver according to claim 1, wherein switching control of the switch is performed when the analog broadcasting is stopped. After termination of analogue broadcasting, analogue according to any one of claims 1 to 3 in which the channel of the current digital is characterized in that it comprises a channel converter for converting to be assigned to the same channel as the original analog broadcasting / Digital television receiver. Furthermore, as an output to other devices, by switching with the changeover switch before and after the analog broadcast stoppage,
After analog broadcasting wave-stopping, the digital broadcast wave counterprogram to any one of claims 1, wherein the performing control to output the digital broadcast into an analog broadcast wave to another device until 4 Analog / digital television receiver as described.

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