CN201039325Y - A digital signal receiving device for computer - Google Patents

Abstract

The utility model provides a digital signal receiving device used for computer, comprising an antenna, a high frequency head, an AD converter, a demodulator and a USB controller, wherein, the antenna is used for receiving DMB-T television signals sent by a television station; the high frequency head tunes the received signals; the high frequency head outputs analog signals which is converted to digital signals by the AD converter; the demodulator outputs TS flow to the USB controller which is connected with a computer through a USB interface; and the utility model is provided with a mass storage with an integrated transcribing and playing software. Once carrying the digital signal receiving device, users can realize the functions of transcribing and playing through a PC at the place where DMB-T television signals reach, thus being very convenient to use and realizing that once being plugged in, the portable equipment can be used.

Description

A digital signal receiving device for computer

technical field

The utility model relates to the technical field of DMB-T digital television, in particular to a digital signal receiving device with a USB interface for a computer.

Background technique

Today, the Chinese digital TV standard of DMB-T has been formulated, and the digital TV programs based on the DMB-T standard of major TV stations have started trial broadcasting one after another. At present, various forms of DMB-T national standard digital TV receivers have appeared. However, these fixed Advanced digital TV receivers can no longer meet people's ever-increasing pace of life, especially mobile receivers. On the other hand, since computers have gradually penetrated into all aspects of people's lives, there are also many products that realize the function of PCs receiving and playing TV signals; there are mainly two methods for the realization of such products, one is to equip the PC with an RF signal TV receiving card, the signal received by this TV receiving card is RF signal, it does not have the function of receiving DMB-T digital TV signal, and it is very inconvenient to use; another way is to watch TV through the Internet, this kind of product is The program is watched according to the resource of the network, but the cost is expensive, and common people cannot accept this program source to watch TV, and watching this program source is easily affected by the network environment. Products need to be improved and developed.

Contents of the invention

The purpose of this utility model is to provide a portable plug-and-play digital signal receiving device with a USB interface for the defects of the above-mentioned prior art.

The technical scheme of the utility model is as follows:

A kind of digital signal receiving device that is used for computer, comprises antenna, tuner, AD analog-to-digital converter, demodulator, and described antenna is used for receiving the DMB-T television signal that TV station sends, is paired by described tuner The received signal is tuned, the tuner outputs an analog signal, the analog signal is converted into a digital signal through the analog-to-digital converter, and then the demodulator demodulates and outputs the TS stream, which is characterized in that: it also includes a USB control device, the USB controller and the antenna, the tuner, the AD analog-to-digital converter and the demodulator are integrated on a PCB circuit board, placed externally on the computer, and connected to the computer through a USB interface connected to the above computer.

Wherein, the USB controller includes a control chip for managing and coordinating the work of various components inside the system.

Wherein, a storage chip is also included, and the storage chip is signal-connected with the USB controller for data storage.

Wherein, recording and playing software are integrated in the storage chip, and the TS stream is input to the computer through the USB controller for recording and calling of data.

Wherein, a transcoding chip is also included, and the two ends of the transcoding chip are respectively connected with the demodulator and the memory, and the transcoded TS stream data packets are stored in the transcoding chip through the transcoding chip. The above-mentioned memory is used to store received video, audio and other data.

The utility model provides a digital signal receiving device for a computer, which is placed outside the computer and connected to the computer through a USB interface. The digital signal receiving device is equipped with a large-capacity memory integrated with recording and playing software. As long as the receiving device is carried, the functions of recording and playing can be realized through a PC in a place where there is a DMB-T TV signal, which is very convenient to use and realizes portable plug and play.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the recording mode diagram of the present utility model;

Fig. 3 is a diagram of another recording method of the present invention.

Detailed ways

Preferred embodiments of the present utility model are described in detail below.

A kind of digital signal receiving device with USB interface, as shown in accompanying drawing 1, comprises antenna, tuner chip, AD analog-to-digital converter chip, demodulator chip, USB controller chip and memory chip, described chip And the interface circuit is integrated on the PCB circuit board, and connected with the computer through the USB interface. The digital signal receiving device receives the DMB-T television signal sent by the TV station through the antenna, and the signal is tuned by the tuner, and the analog signal output by the tuner is changed after passing through the analog-to-digital converter. It is a digital signal, and then demodulated by the demodulator, wherein the demodulation chip is responsible for demodulating the received DMB-T digital signal, demodulating the TV program information and outputting the TS stream (transport data stream), Through the USB controller, the TS data stream is made into a data packet and output to the USB interface for transmission to the computer, wherein the USB controller is the MCU of the entire system, responsible for managing and coordinating the work of each chip. In addition, a large-capacity memory chip is selected for the memory, and recording and playback software are integrated in the memory chip to realize data storage and reading.

The software used by the recordable digital signal receiving device of the utility model includes: device driver software, decoding technology software disclosed by the PC, transcoding technology software disclosed by the PC and USB transmission control protocol. First, when a digital signal receiving device with a USB interface is connected to a computer, the computer system decodes and transcodes the received TS stream data through software, and is controlled by the CPU of the computer to set the user's planned recording time and the video that the user wants to save. The audio format, according to the USB transmission control protocol, realizes the access to the data.

The utility model has two recording methods, as shown in Figure 2, recording method 1, after the system receives the digital TV signal of DMB-T, through the application software built in the memory, the TS stream data input by the USB controller is sent by The PC controls the transcoding and converts it into an MPEG-2 file and stores it in the designated location of the computer hard disk. The first method of recording is to use a computer to achieve transcoding, and then store the converted data in the hard disk of the computer. Users can record while watching TV programs or plan to start recording at a specified time.

As shown in accompanying drawing 2, it is the second recording method. After the system receives the digital TV signal of DMB-T, the program information in the TS stream data analyzed is input to the computer through the USB controller, and there is a transcoding chip in it. The code chip converts the TS stream data sent by the demodulator into specified recording video and audio coding formats, and then stores the received video, audio and other data into the memory. The computer described here is used to call the built-in software of the utility model system to set the video format, audio format, and recording start time and end time of the recording file.

The difference between recording method two and recording method one is that it is transcoded by the transcoding chip hardware used in the utility model, and the computer is only an environment for software use; and the storage location of recording method two is the utility model. described memory.

Since the utility model adds a large-capacity memory chip to the digital signal receiving device with a USB interface, two very practical recording methods are designed, and the application software is integrated into the memory chip, which is easy to carry and realizes Plug and play for portable devices.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

Claims (5)

1. digital signal processing apparatus that is used for computer, comprise antenna, tuner, the AD analog to digital converter, demodulator, described antenna is used to receive the DMB-T TV signal that TV station sends, carry out tuning by described tuner to the signal that receives, described tuner output analog signal, transfer analog signal to digital signal through described analog to digital converter, then by demodulator demodulation output TS stream, it is characterized in that: also comprise a USB controller, described USB controller and described antenna, described tuner, described AD analog to digital converter and described demodulator are integrated on the PCB circuit board, are placed on described computer, link to each other with described computer by USB interface.

2. digital signal processing apparatus according to claim 1 is characterized in that, described USB controller comprises a control chip, is used to manage the work with each parts of coherent system inside.

3. digital signal processing apparatus according to claim 1 is characterized in that, also comprises a storage chip, and described storage chip is connected with described USB controller signals, is used for the access of data.

4. digital signal processing apparatus according to claim 3 is characterized in that, integrated recording and playout software inputs to described computer by described USB controller with TS stream in the described storage chip, is used to realize the storage of data and read.

5. according to claim 1 or 4 described digital signal processing apparatus, it is characterized in that, also comprise a transcoding chip, the two ends of described transcoding chip link to each other with described memory with described demodulator respectively, the TS flow data that described transcoding chip is used for that described demodulator is sent into is converted to specifies video and the audio coding form of recording, and deposits video, audio frequency and other data that received in described memory.

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