JPH0983907A - Satellite broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily start a device when supplying power by reducing the time for discrimination. SOLUTION: A discriminating operation is started when the power is supplied and a power source for a converter is turned off at a step (1). Next, a channel for discrimination is read out at a step (2). Then a receiving state is discriminated concerning not for all the channels but for only stored and specified channels. Consequently channels 11, 7 and 5, for example, are successively turned at a step (3). Then each receiving state is judged at a step (4). When there is no broadcast and the receiving state is normal (NO), the power source for the converter is turned on at a step (7) and the channels 11, 7 and 5 are successively turned again at a step (8). Then each receiving state is judged at a step (9) and when there is a broadcast and the receiving state is normal (YES), the power source for the converter is judged to be necessary at a step (10).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving apparatus suitable for use when receiving satellite broadcasts alone or by co-listening.

[0002]

2. Description of the Related Art For example, broadcasting satellites (BS) and communication satellites (C)
In receiving satellite broadcasting from S), it is necessary to perform signal processing such as frequency band conversion by a converter provided near the receiving antenna. For this reason, in a satellite broadcast receiving apparatus that receives such satellite broadcast, a power supply circuit for the converter is built in the apparatus, and when receiving, the DC voltage from this power supply circuit is supplied to the converter through the antenna cable. Is being done.

However, for example, when a plurality of satellite broadcasting receiving devices are connected to one receiving antenna and a converter for co-listening, the connected one satellite broadcasting receiving device serves as a converter. If power is being supplied, it is not necessary to supply power from other devices. Also, for example, in a co-listening system such as an apartment house, if a booster or the like is provided in the middle stage, power is supplied from the booster for the converter, and it is necessary to supply power from each satellite broadcast receiving device. There is no.

Therefore, conventionally, a shutoff means is provided in a power supply circuit for a converter incorporated in a satellite broadcast receiving device,
For example, the power supply can be cut off by switching a switch provided on the rear panel. However, such switching of switches is inconvenient and often not performed. Further, when a plurality of devices are connected in a general household, it is necessary to switch each time the device is used. Note that the power supply for such a converter is usually about 4
It consumes watts of electricity.

On the other hand, for example, when the satellite broadcasting receiver is turned on, it is possible to determine whether or not it is necessary to supply the power for the converter, and automatically supply the power when necessary. it was thought. That is, in order to make this determination, it is determined whether the broadcast can be received with the power supply for the converter shut off, and if the broadcast is normally received in this state, the converter receives power from other sources. Is supplied, and it can be determined that it is not necessary to supply power from this device.

However, for example, in order to determine whether or not the reception state of the broadcast of one channel is normal in the satellite broadcast receiving device, for example, a time of 4V (vertical period) = 1/15 seconds is required. Therefore, it takes about 1 second to perform this determination twice for 8 channels of the broadcasting satellite, for example. Since the satellite broadcast receiving device cannot perform other processing during this time, the startup of the device when the power is turned on is delayed due to this determination.

[0007]

This application has been made in view of the above-mentioned problems, and the problem to be solved is to determine whether or not it is necessary to supply a power supply for a converter when the power is turned on. In the case where the device is discriminated and the power is automatically supplied, in the conventional device, the startup at the time of turning on the power is delayed.

[0008]

Therefore, according to the present invention, the reception / non-reception is determined only for the channel in which satellite broadcasting is being performed. According to this, It is possible to shorten the discrimination time and quickly start up the apparatus when the power is turned on.

[0009]

That is, according to the present invention, in a satellite broadcast receiving apparatus having a function of supplying an operating power to a converter when receiving a satellite broadcast, a power shutoff means for shutting off the operating power supply and a satellite broadcast. And a non-reception discriminating means for discriminating reception / non-reception is provided for the broadcasted channel, and when the non-reception is discriminated by the reception discriminating means in a state where the power is shut off by the power shut-off means, The control for canceling the interruption is performed.

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an example of a satellite broadcast receiving apparatus to which the present invention is applied. In FIG. 1, the satellite broadcast signal received by the receiving antenna 1 is converted by the converter 2
And is subjected to signal processing such as frequency band conversion. The signal converted by the converter 2 is supplied to the satellite broadcast receiving device 4 through the antenna cable 3.

In this satellite broadcast receiving device 4, the signal from the above-mentioned antenna cable 3 is used as a DC blocking capacitor 5.
Is supplied to the tuner 6 through. Further, a power supply circuit 7 for the converter is provided. Then, the converter power supply from the power supply circuit 7 is supplied to the antenna cable 3 through the switch 8 as a power cutoff unit and the backflow prevention diode 9, and is supplied to the converter 2 through the antenna cable 3.

Further, a microcomputer for selecting a channel (μ
-COM) 10 is provided. The signal from the microcomputer 10 is supplied to the tuner 6. In addition, various control information and the like relating to channel selection reception are stored in the non-volatile memory 11. Then, a signal from the microcomputer (μ-COM) 12 for main control is supplied to the microcomputer 10, and the tuner 6 receives the desired channel.

Further, the signal received by the tuner 6 is supplied to the demodulation circuit 13, and the received detection signal is converted into a standard television signal and the PCM audio signal is demodulated. The video signal and the audio signal demodulated by the demodulation circuit 13 are supplied to the audio / video output device 14 to reproduce the received satellite broadcast.

Further, in this device, whether or not the power supply for the converter from the power supply circuit 7 is cut off by the switch 8 is determined as described below. That is, FIG. 2 shows an example of a flowchart for the determination.

In FIG. 2, for example, when the satellite broadcasting receiver is powered on, the discrimination operation is started. Then, first, in step [1], the switch 8 for the converter power supply is turned off. Next, in step [2], the channel to be discriminated is read from the non-volatile memory 11.

That is, in this device, the above-mentioned reception state determination is not performed for all channels, but
This is performed only for a specific channel stored in the non-volatile memory 11. Therefore, in the non-volatile memory 11, for example, when determining the reception state of the broadcast from the broadcasting satellite (BS), only the channels 11, 7, and 5 currently being broadcast are stored.

Therefore, in step [3], these 11, 7,
Channels 5 are selected in sequence. Then, in step [4], the respective reception states are judged, and if there is a broadcast with a normal reception state (YES), step [5]
It is determined that the converter power supply is unnecessary, and in step [6] the converter power switch 8 remains off.
The last channel received last time is selected.

If there is no broadcast in a normal reception state in step [4] (NO), the converter power switch 8 is turned on in step [7], and step [8].
Then, channels 11, 7, and 5 are selected again sequentially.

And step

In [9], the reception status of each is judged, and when there is a broadcast in which the reception status is normal (Y
In ES), it is determined in step [10] that the converter power supply is necessary, and in step [11], the last received channel is selected while the converter power switch 8 is kept on.

Step again

If there is no broadcast in a normal reception state in [9] (NO), it is determined that there is no signal input in step [12], and in step [13] the switch 8 of the converter power supply is turned off and the previous reception is performed. The selected last channel is selected.

Further step [6] [11] or [1]
After the channel selection is performed in 3], the determination made in step [5] [10] or [12] is stored in the nonvolatile memory 11 in step [14], and the determination operation is ended. .

Therefore, in this device, in the satellite broadcast receiving device having the function of supplying the operating power to the converter for receiving the satellite broadcast, the power shutoff means for shutting off the supply of the operating power and the satellite broadcast are broadcast. Receiving discrimination means for discriminating reception / non-reception for the channel is provided, and when the reception discrimination means discriminates non-reception while the power is cut off by the power cutoff means, the power cutoff by the power cutoff means is released. Control can be performed.

As a result, when the power supply for the converter is determined to be necessary or not when the power is turned on and the power is automatically supplied, conventionally, there is a problem that the startup of the apparatus is delayed. However, according to the present invention, the determination time is shortened by determining the reception / non-reception only for the channel in which the satellite broadcasting is being performed, and the apparatus is started up when the power is turned on. Can be done quickly.

In the above-mentioned device, the number of channels broadcast from, for example, a broadcasting satellite (BS) may increase in the future, but in order to determine whether or not it is necessary to supply a power source for the converter, for example, 3 channels are used. It is considered sufficient to determine the channel level. Also, increasing this leads to an increase in discrimination time.

However, it is conceivable that the channel broadcast in the future may change. Therefore, it is conceivable that the determination channel stored in the nonvolatile memory 11 is rewritable. In that case, rewriting of the channel can be performed by supplying rewriting data to the microcomputer 12 for main control using the remote control means 15 and transferring the data of the microcomputer 12 to the non-volatile memory 11. .

Further, rewriting of this channel can be performed for all three channels, for example, but if the capacity of the RAM for storing such data is not sufficient, it is considered that all channels will be changed. Since it is not possible, it is considered that there is no practical problem even if rewriting is possible only for one channel set to five channels.

Thus, according to the satellite broadcast receiving apparatus described above, in the satellite broadcast receiving apparatus having the function of supplying the operating power to the converter when receiving the satellite broadcast, the power cutoff means for cutting off the supply of the operating power, and the satellite. When a reception determination means for determining reception / non-reception is provided for a channel being broadcast, and when the reception determination means determines non-reception with the power supply cut off, the power cut-off means By performing the control to release the interruption of the power source, the discrimination time can be shortened and the apparatus can be started up quickly when the power source is turned on.

[0028]

According to the present invention, in a satellite broadcast receiving apparatus having a function of supplying operating power to a converter when receiving satellite broadcasting, a power cutoff means for cutting off the supply of operating power, and satellite broadcast broadcasting. When the reception discrimination means discriminates non-reception while the power is cut off by the power cut-off means, the power cut-off means cuts off the power supply. You can now control to release.

As a result, when the power supply for the converter is determined to be necessary or not when the power is turned on and the power is automatically supplied, conventionally, the startup of the apparatus is delayed. However, according to the present invention, the determination time is shortened by determining the reception / non-reception only for the channel in which the satellite broadcasting is being performed, and the apparatus is started up when the power is turned on. Is something that can be done quickly.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of a satellite broadcast receiving device to which the present invention is applied.

FIG. 2 is a diagram for explaining the operation.

[Explanation of symbols]

 1 Reception Antenna 2 Converter 3 Antenna Cable 4 Satellite Broadcasting Receiver 5 Capacitor 6 Tuner 7 Converter Power Supply Circuit 8 Switch 9 Diode 10 Tuning Microcomputer (μ-COM) 11 Nonvolatile Memory 12 Microcomputer for Main Control (Μ-COM) 13 Demodulation circuit 14 Audio / video output device 15 Remote operation means

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area H04N 7/20 H04N 7/20

Claims (4)

[Claims] 1. A satellite broadcast receiving apparatus having a function of supplying an operating power supply to a converter when receiving a satellite broadcast, in a satellite power receiving means for cutting off the supply of the operating power supply, and a channel broadcasting the satellite broadcast. And a reception discriminating means for discriminating reception / non-reception, and when the reception discriminating means discriminates non-reception in a state where the power is cut off by the power cutoff means, the power cutoff by the power cutoff means A satellite broadcast receiving device characterized by performing control for canceling. 2. The satellite broadcast receiving device according to claim 1, wherein a nonvolatile memory is provided, and the channel in which the satellite broadcast is being broadcast is stored in the nonvolatile memory. 3. The satellite broadcast receiving device according to claim 2, wherein the nonvolatile memory is a rewritable memory. 4. The satellite broadcast receiving device according to claim 2, wherein the non-volatile memory broadcasts the satellite broadcast.
A satellite broadcast receiving device that stores channels and at least one of the channels is composed of a rewritable memory.