RU5481U1 - ADDITIONAL INFORMATION SIGNAL RECEIVER - Google Patents

Abstract

1. A device for receiving additional information signals, comprising a tuner, the input of which is the input of the device, and a detector unit, as well as a series-connected video processor and a decoder unit, characterized in that it contains a broadband filter whose bandwidth is in a range limited on one side spectrum of the full TV signal, and on the other hand the spectrum of the additional information signal, the input of the broadband filter is connected to the output of the tuner, and the output is connected to the input of the video processor. 3. The device according to claim 1, characterized in that the broadband filter is made with a bandwidth equal to the spectrum of additional information signals.

Description

Additional information receiving device

The utility model relates to the field of radio electronics, in particular to systems for transmitting and receiving digital information signals embedded in the structure of a television (TV) signal.

A device for receiving digital signals of additional information is known. Application PCT / RU92 / 00218 of 11/30/1992. MKI 5 H04N 5/66 7/08, containing a series-connected channel selector and a radio channel unit, respectively allocating an intermediate frequency signal and extracting the envelope of the signal, a video processor, a unit for determining the presence, processing and registration of additional information (decoder).

The disadvantage of this device is that despite the fact that it is proposed for use for receiving, processing additional information by a personal computer and does not involve use in a TV, the transmission bandwidth of the radio channel block corresponds to the spectrum of a full TV signal, which is not

allows you to provide increased sensitivity when receiving additional information signals.

Closest to the claimed is a device for decoding teletext given in the materials of the application PCT / GB 84/00271 of 08/06/1984 H04N 5/445, containing a tuner connected in series, a decoder unit containing an intermediate frequency amplifier and the detector itself, a video processor and a teletext decoder unit .

The disadvantage of this device is that, being intended for use as part of a TV, it contains a tuner with a bandwidth corresponding to the full TV signal, which does not provide additional sensitivity when receiving additional information signals. The utility model is based on the task of creating a device for receiving additional information signals, which is used to receive data for the subsequent processing of a standard computer, for example, a personal computer, and which provides an increase in the reliability of receiving additional information by improving the signal-to-noise ratio at the detector output and increasing sensitivity devices in general to additional information signals. The problem is solved in that the device containing the tuner, the input of which is the input of the device, and the detector unit, as well as connected in series

MShS6 7/08, 7/088

a video processor and a decoder unit, an additional broadband filter is introduced, the bandwidth of which is in the range limited on the one hand by the spectrum of the full TV signal, and on the other hand by the spectrum of the additional information signal, the input of the broadband filter is connected to the tuner output, and the output is connected to the video processor input .

When narrowing the bandwidth of the broadband filter to a width equal to the spectrum of the additional information signal, the signal-to-noise ratio at the detector output is optimal among the possible values for the bandwidth from the specified range.

FIG. illustrates a functional diagram of a device.

The device contains a tuner 1, the input of which is the input of the device, and the output is connected to the input of the broadband filter 2, its output is connected to the input of the detector unit 3, the output of which is connected to the input of the video processor 4, the group of outputs of the video processor 4 is connected to the group of inputs of the block of the decoder 5, group the outputs of which are the outputs of the device.

The device operates as follows. The input of the tuner 1 from an external source of the TV signal (for example, an on-air TV antenna or cable TV network) receives a full TV signal. Tuner 1 selects a given TV channel and converts the signal into an intermediate frequency signal, which, passing through a broadband filter 2, is converted into a signal with a spectrum width equal to the filter passband. The detector unit 3 selects the envelope of this signal and the low-frequency signal obtained in this way enters the video processor 4, which extracts synchronization and data signals from it. These signals are sent to the decoder unit 5, where they are converted into a digital code, which can be transmitted to an external data processing device, such as a personal computer. Due to the fact that the spectrum of the intermediate frequency signal entering the detector 4 is narrowed, the signal-to-noise ratio improves at the output of the latter, and thus the stability of the device as a whole to interference present in the TV signal is increased, and therefore the reliability of receiving additional information signals is increased.

Claims (2)

1. A device for receiving additional information signals, comprising a tuner, the input of which is the input of the device, and a detector unit, as well as a series-connected video processor and a decoder unit, characterized in that it contains a broadband filter whose bandwidth is in a range limited on one side the spectrum of the full TV signal, and on the other hand the spectrum of the additional information signal, the input of the broadband filter is connected to the output of the tuner, and the output is connected to the input of the video processor. 3. The device according to claim 1, characterized in that the broadband filter is made with a bandwidth equal to the spectrum of additional information signals.