JPS5943009B2 - signal receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A tuner used in a receiving device such as a television receiver is known as an electronically tuned tuner.

This electronic tuning tuner has a variable capacitance diode in a tuning circuit such as a high frequency amplifier circuit or a local oscillation circuit, and the voltage applied to this variable capacitance diode is changed by a tuning operation to change the tuning frequency, local oscillation frequency, etc. This allows the broadcast signal of the selected channel to be received.

In this case, the voltage to be applied is preset in advance according to the channel by each preset volume, and the preset voltage is selected by pressing the channel selection button. The present invention relates to a signal receiving device having a plurality of electronic tuners and capable of receiving broadcast signals of two or more different channels at the same time. By simply using a preset voltage setting circuit having a volume, a preset voltage corresponding to a channel selection can be output from each of a plurality of electronic tuners.

Hereinafter, an example in which the signal receiving device according to the present invention is applied to a receiving device of a so-called television device that combines a television receiver and a video recorder (VTR) will be explained.
Let me explain with reference to the diagram.

That is, in the figure, 1 is an electronic tuning tuner for a television receiver, 11 is its channel selector, 12 is its channel memory, 13 is a switch circuit, and the channel selector 11 has channel selection buttons 51, 52, . . .・・・
An SN is provided, which is arranged on the operation panel surface.

2 is an electronic tuning tuner for VTR, 21 is its channel selector, 22 is its channel memory, 23 is a switch circuit, and the channel selector 21 has a selection button T.
i, T2...TN are provided, which are also arranged on the operation panel surface.

3 is a preset voltage supply circuit, which has N preset volumes VRI, VR2, etc. corresponding to the number of channel selection buttons.
・Has a VRN.

Then, for example, the channel selection buttons 51, 52, . . . SN and the channel selection buttons Ti, T2, . When making the preset volume VRI correspond to a channel, the preset volume VRI is preset so that a voltage Ecl is obtained on its slider so that the local oscillation frequency is the frequency at which the broadcast wave of the first channel is received. The set polyurethane VR2 is preset so as to obtain a voltage on its slider whose local oscillation frequency is the frequency at which the broadcast waves of the second channel are received. The slider is preset so as to obtain a voltage ECN at which the local oscillation frequency is the frequency at which the Nth channel broadcast waves are received. When, for example, the channel selection button S1 of the channel selector 11 for the television receiver is pressed, the fact that the channel selection button S1 was pressed is stored in the channel memory 12, and the N outputs Al,
For example, a voltage is obtained only at the output A1 of A2...AN, and a signal CL indicating that it is a low channel of VHF is obtained as a band selection signal BA.

Then, with the voltage obtained at the output A1 of the channel memory 12, the output VCA of the switch circuit 13 is as follows.
Voltage E obtained on the slider of preset polyurethane VRl
Cl is obtained.

Then, the signal CL from the channel memory 12 and the voltage ECl from the switch circuit 13 are applied to the electronic tuning tuner 1.
The signal CL switches the inductance of each tuning circuit for VHF low channel, and the voltage ECl is applied to the variable capacitance diode of each tuning circuit to change its capacitance, so that in this tuner 1, A broadcast wave signal of the first channel is selected and received from the received signal from the antenna 4, and this tuner 1 converts it into a video intermediate frequency signal.

This video intermediate frequency signal is supplied to the video intermediate frequency amplification circuit of the television receiver unit 5, and the broadcast program of the first channel is displayed on the screen of the cathode ray tube. Next, when you press, for example, the channel selection button T4 of the VTR channel selector 21, the fact that this button was pressed is stored in the channel memory 22, and the N outputs Bl, B2, . . . BN Of these, a voltage is obtained only at the output B4, and a signal CH indicating that the VHF Haiti channel is present is obtained as the band selection signal BB.

Then, the voltage obtained at the output B4 of the channel memory 22 is used as the output VCB of the switch circuit 23 to select the preset polygon VR. Voltage E obtained on slider 4
C4 is obtained.

Then, the signal CH from the channel memory 22 and the voltage Ec47) from the switch circuit 13 are supplied to the electronic tuning tuner 2, and the inductance of each tuning circuit is switched to the VHF high channel by the signal CL.
Voltage EC4 is applied to the variable capacitance diode of each tuning circuit to change its capacitance, and in this tuner 2,
The broadcast wave signal of the fourth channel is selected and received from the received signal from the antenna 4, and a signal obtained by converting the fourth channel signal into a video intermediate frequency signal is obtained.

Then, this video intermediate frequency signal is supplied to the video intermediate frequency amplification circuit of the VTR section 6, and the VTR is brought into a state in which the signal of the fourth channel can be recorded. In this way, the preset voltage for the television receiver and the preset voltage for the VTR can be obtained using only the single preset voltage setting circuit 3. Moreover, since the preset voltages can be obtained at the same time, when you are watching a broadcast program on a channel on a television receiver, you can
It is possible to record so-called counter programs of other channels. As described above, according to the device of the present invention, a single preset voltage setting circuit can be shared by a plurality of electronically tuned tuners.

Therefore, as in the case where a preset voltage setting circuit is provided for each electronic tuning tuner, the tuning voltages ECl, EC2, . . .
...Compared to the case of setting ECN, setting the preset voltage is much easier because it is only necessary to adjust the preset polygon of a single preset voltage setting circuit.

Moreover, since only one set of expensive preset polyurethanes is required depending on the number of selected channels, there is an advantage that the manufacturing cost is reduced. In particular, as shown in the example in the figure, if the present invention is used in the receiving device of a television device that combines a television receiver and a VTR, the advantage is that a television device that can record so-called alternate programs can be manufactured at a low cost. There is.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a system diagram showing an embodiment of the device of the present invention. 1 and 2 are electronic tuning tuners, respectively, 3 is a preset voltage setting circuit, 11 and 21 are channel selectors, respectively, and 12 and 22 are channel memories 1 and 1, respectively.
3 and 23 are the same circuits, VRl, VR2...
- VRN is a set polyume.

Claims (1)

[Claims] 1 A plurality of electronic tuning tuners, a preset voltage setting circuit having a plurality of preset volumes common to the plurality of electronic tuning tuners and having one set of preset volumes corresponding to the number of selected channels, and a channel provided for each of the plurality of electronic tuning tuners. A preset voltage is obtained from the preset voltage setting circuit according to the channel selection in each of the channel selection circuits, and each of the obtained preset voltages is supplied to each electronic tuning tuner. , a signal receiving device capable of receiving signals of different channels using the plurality of electronic tuning tuners.