JP2000115661A - Cs digital reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption at reception of standby of a CD digital receiver. SOLUTION: A tuner 1 is switched over to a channel for guidance by data from a memory part 6 by a reception standby operation and the power supply to parts other than the part A is turned off. A CD digital transmitter transmits guide signals by a guide channel before reporting information transmission and then transmits reporting information through a required channel. A receiver discriminates guide signal reception in a discrimination part 7, based on AGC signals from a demodulation part 2, turns on the power source of a demultiplex part 3 and an MPEG decoder 4, switches over the tuner to a reporting information channel, inputs the signals from the demodulation part to the demultiplex part 3, separates the reporting information, performs an expansion processing in the MPEG decoder, writes it in the memory part and turns off the power supply to the part other than the part A. Thereafter, the power supply to the device is turned on, the reporting information is read from the memory part 6, NTSC conversion or the like is performed in an encoder 5 and then it is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CS (communication satellite) digital receiving system, and more particularly to a system for reducing power consumption of a CS digital receiving device (hereinafter abbreviated as "receiving device") in a standby state.

[0002]

2. Description of the Related Art CS digital broadcasting has a notification function for notifying a receiver of a pay broadcast of charging information, and the like. (A part surrounded by a dotted line in the block diagram shown in FIG. 2) must always be operated, and power consumption cannot be reduced.

[0003]

SUMMARY OF THE INVENTION In view of the above, according to the present invention, a guide signal is transmitted from a CS digital broadcaster before transmission of notification information. By operating only the minimum circuit for receiving, operating other circuits by receiving the guide signal, receiving and processing notification information, etc.,
An object is to reduce power consumption during reception standby.

[0004]

In order to achieve the above object, a CS digital receiving system according to the present invention provides a guide signal for notifying the transmission of notification information before transmitting the notification information to a receiver. A CS digital transmitting device that transmits on the guide channel set in the above, and then transmits notification information on a required channel, a tuner that receives a signal from the CS digital transmitting device, and a signal from the tuner A demodulator for demodulating, a demultiplexer for separating each program and information from the signal from the demodulator, an MPEG decoder for expanding the program or information from the demultiplexer, and an An encoder for converting a signal into an NTSC signal; a determination unit for determining the guide signal; A memory section for storing notification information and the like from the coder, and during reception standby, while stopping power supply to the demultiplex section, MPEG decoder and encoder, switching the tuner to the guide channel, A guide signal is determined by the determination unit based on a signal from the demodulation unit, and the tuner is switched to the channel for receiving the notification information based on the signal from the determination unit.
A power supply is supplied to the EG decoder, and the receiving device is configured to store the notification information separated by the demultiplex unit and decompressed by the MPEG decoder in the memory unit.

[0005] In the reception standby state, after receiving the notification information, the receiving device switches the tuner to a guide channel and stops supplying power to the demultiplex unit, the MPEG decoder and the encoder.

It is assumed that the guide signal transmits a carrier signal of a guide channel without modulation.

[0007] The discriminating section includes an AG output from the demodulating section.
The guide signal is determined based on the C voltage.

In addition, for the emergency broadcast, a guide signal for notifying the emergency broadcast is transmitted from the CS digital transmitting apparatus on a guide channel set for the emergency broadcast, and thereafter, the emergency broadcast is performed on a required channel. The receiving apparatus, when waiting for reception, a demultiplex unit, an MPEG
The power supply to the decoder and the encoder is stopped, the tuner is switched to the guide channel, the guide signal is determined by the determination unit based on the signal from the demodulation unit, and the tuner is used for emergency broadcast reception based on the signal from the determination unit. In addition to switching to the channel, power may be supplied to the demultiplex unit, the MPEG decoder and the encoder, and the emergency broadcast separated by the demultiplex unit and decompressed by the MPEG decoder may be processed by the encoder and output.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a block diagram of a main part of an embodiment of a receiving device of a CS digital receiving system according to the present invention. In the figure, 1 is a tuner for receiving CS digital broadcasts, 2 is a demodulator for demodulating a signal received by the tuner 1, and 3 is a demultiplexer for separating a program (plural) and notification information data from a signal from the demodulator 2. The multiplex section 4 and the MPEG (M
MPEG decoder for expanding a program or information information data compressed by the otion Picture Image Coding Experts Group (moving picture coding standard) method, an encoder for converting a signal from the MPEG decoder 4 into an NTSC signal,
Is a memory unit for storing the information of the tuner 1 at the time of reception standby, the channel of the tuner 1 at the time of receiving the guide signal from the CS digital transmission device, and the like, while storing the notification information processed by the MPEG decoder 4. A determination unit that determines reception of a guide signal based on the AGC signal (voltage) from the demodulation unit 2 during standby, and a CPU 8 that controls each unit of the receiving device.

Next, the operation of the CS digital receiving system according to the present invention will be described. The receiving apparatus supplies power only to each of the sections A (the tuner 1, the demodulator 2, the memory 6, the discriminator 7, and the CPU 8) surrounded by a dotted line in a reception standby operation (power off) to operate the memory. The tuner 1 is switched to a preset guide channel (a radio wave is not transmitted except when transmitting notification information) via the CPU 8 based on the data read from the unit 6. The CS digital transmission device transmits a guide signal for notifying the transmission of the notification information before transmitting the notification information on the guide channel when transmitting the notification information such as the charging of the pay broadcast to the receiver, and thereafter, Send notification information on the required channel. The receiving device receives the guide signal from the CS digital transmitting device by the tuner 1, demodulates the demodulated signal by the demodulator 2, and outputs the AGC signal (voltage). This AGC signal is input to the determination unit 7 via the CPU 8, and it is determined that the guide signal has been received.
Demultiplexer 3 and MPEG decoder 4
The tuner 1 is switched to the channel containing the notification information by the CPU 8 based on the data read from the memory 6 at the same time. As a result, the notification information from the CS digital transmission device is received by the tuner 1, demodulated by the demodulation unit 2, separated by the demultiplex unit 3, decompressed by the MPEG decoder 4, and transmitted to the data of the memory unit 6 via the CPU 8. After receiving the notification information stored in the recording area, the tuner 1 is switched to the guide channel based on the data read from the memory unit 6, and the power supply to parts other than the unit A is stopped.

Then, later, the power supply of the receiving device is turned on,
The notification information written in the memory unit 6 is read, and the CPU
The video signal is input to the encoder 5 via the PC 8, converted into an NTSC signal and output, and the pay TV broadcast information and the like are viewed by a subsequent TV receiver or the like. As described above, only the portion A surrounded by the dotted line is operated during the standby for reception, so that the power consumption during the standby for reception can be reduced. The guidance signal is
For example, a guide channel (usually an empty channel)
May be transmitted without modulation. In addition, an emergency broadcast such as a natural disaster can be received by the receiving device that is waiting for reception. That is, after transmitting a guide signal for notifying an emergency broadcast from the CS digital transmission device on a guide channel set for the emergency broadcast, the emergency broadcast is performed on a required channel. The power supply to the demultiplex unit 3, the MPEG decoder 4, and the encoder 5 is stopped, the tuner 1 is switched to the guide channel, and the discriminating unit 7 discriminates the guide signal based on the signal from the demodulation unit 2 and the tuner. 1 is switched to a channel for receiving an emergency broadcast, and power is supplied to the demultiplex unit 3, the MPEG decoder 4 and the encoder 5, and the emergency broadcast separated by the demultiplex unit 3 and decompressed by the MPEG decoder 4 is encoded. 5 to process and output, and at the same time, switch the subsequent TV receiver to the operating state,
Emergency broadcasts are output as video and audio.

[0012]

As described above, according to the present invention, C
According to the S digital receiving system, a guide signal is transmitted from the CS digital broadcaster before transmission of notification information and the like, and the receiving device operates only a minimum circuit for receiving the guide signal when waiting for reception. In this case, the other circuits are operated by receiving the guide signal to receive the notification information and the like, so that the power consumption during the reception standby can be reduced.

[Brief description of the drawings]

FIG. 1 is a main block diagram of an embodiment of a receiving device of a CS digital receiving system according to the present invention.

FIG. 2 is a main block diagram of an example of a conventional receiving apparatus.

[Description of Signs] 1 Tuner 2 Demodulation unit 3 Demultiplex unit 4 MPEG decoder 5 Encoder 6 Memory unit 7 Discrimination unit 8 CPU

Claims (5)

[Claims] 1. Before transmitting the notification information to the receiver, a guidance signal for notifying the transmission of the notification information is transmitted on a guidance channel set for guidance, and thereafter, the notification information is transmitted on a required channel. A CS digital transmitting device adapted to transmit, a tuner for receiving a signal from the CS digital transmitting device, a demodulating unit for demodulating a signal from the tuner, and separating each program and information from the signal from the demodulating unit. A demultiplexing section, an MPEG decoder for decompressing a program or notice information from the demultiplexing section, an encoder for converting a signal from the MPEG decoder into an NTSC signal, and a discriminating section for discriminating the guide signal, A memory unit for storing notification information and the like from the MPEG decoder. The power supply to the plex unit, the MPEG decoder and the encoder is stopped, and the tuner is switched to the guide channel. The discriminating unit discriminates the guide signal based on the signal from the demodulating unit. Switching the tuner to the channel for receiving the notification information based on, and supplying power to the demultiplex unit and the MPEG decoder,
A CS digital receiving system comprising: a CS digital receiving device configured to store, in the memory, notification information separated by a demultiplex unit and decompressed by an MPEG decoder. 2. The CS digital receiving device switches the tuner to a guide channel after receiving the notification information in a standby state, and supplies power to the demultiplex unit, the MPEG decoder and the encoder. 2. The CS digital receiving system according to claim 1, wherein said system is stopped. 3. The CS digital receiving system according to claim 1, wherein the guide signal transmits a carrier signal of the guide channel without modulation. 4. The CS digital receiving system according to claim 1, wherein said discriminating section discriminates a guide signal based on an AGC voltage output from said demodulating section. 5. For an emergency broadcast, a guide signal for announcing the emergency broadcast is transmitted from the CS digital transmitting apparatus on a guide channel set for the emergency broadcast, and thereafter,
Emergency broadcasting is performed on the required channel, and the CS
The digital receiving apparatus stops power supply to the demultiplex unit, the MPEG decoder and the encoder during reception standby, switches the tuner to the guide channel, and receives a signal from the demodulation unit by the discrimination unit. The guide signal is discriminated, the tuner is switched to the emergency broadcast receiving channel based on the signal from the discriminating unit, and power is supplied to the demultiplex unit, the MPEG decoder and the encoder, and separated by the demultiplex unit. 5. The CS digital receiving system according to claim 1, wherein the emergency broadcast decompressed by the MPEG decoder is processed by an encoder and output.