CN2610588Y

CN2610588Y - Multi-tuning TV tuning demodulator

Info

Publication number: CN2610588Y
Application number: CNU032506252U
Authority: CN
Inventors: 余志勇; 柯发敏; 洪钧
Original assignee: YONGXIN TONGFANG INFORMATION E
Current assignee: YONGXIN TONGFANG INFORMATION E
Priority date: 2003-04-24
Filing date: 2003-04-24
Publication date: 2004-04-07
Anticipated expiration: 2013-04-24

Abstract

The utility model belongs to the technical field of television monitoring network, and relates to a multi-channel television tuning demodulator which comprises a plurality of tuners connected in parallel, a power divider, a multi-channel switch, a single chip computer and an RS232 driver, wherein the input end of the power divider is connected with a radio frequency output opening of a cable television, and the output end of the power divider is connected with the tuners connected in parallel. The multi-channel switch is respectively connected with the single chip computer and the tuners connected in parallel, and the single chip computer is connected with the RS232 driver and connected with the tuners connected in parallel through an IIC bus. The utility model can be applied to monitoring points of a monitoring network of a cable television, and demodulates the cable television radio frequency signals for frequency division multiplex (FDM) at the monitoring points into multi-channel video and audio signals. A provided RS232 interface can be connected with a PC so as to realize remote control and program control.

Description

The multi-channel television tuning demodulator

Technical field the utility model belongs to television monitoring network technical field, be particularly related to and separate the mediation detection to multichannel (16 tunnel) cable TV signal simultaneously, thereby the multi-channel television tuning demodulator of separating mediation monitoring in real time of having realized multichannel wired TV signal designs.

Background technology is along with the fast development of cable TV nerve of a covering, and the broadcast television monitoring network that adapts with it is with very fast formation.It is to improving broadcast television transmissions and broadcast quality, verify the broadcast television coverage effect, provide scientific basis for drafting, revise the nerve of a covering technical plan, being the judging basis of carrying out program making, transmission and broadcast system technical quality comparation and assessment contest, is the state-of-the-art technology means that radio and television administration authorities at different levels and TV station at different levels, wired TV station carry out scientific management.

The main task of wined tv monitoring network is to monitor video quality and the content of TV program that broadcasts in the whole cable TV network in real time.Because the TV programme in the cable TV network is tens covers nearly, if the past is wanted TV programme is monitored in real time, be necessary for each road program and prepare a receiver, and channel need be set by hand at the scene, artificial surveillance television content, this has brought very big inconvenience for the monitoring of cable TV.

The summary of the invention the purpose of this utility model is for overcoming existing weak point to the wined tv monitoring means, a kind of multi-channel television tuning demodulator is provided, can receiving multichannel wired TV signal simultaneously and can carry out Long-distance Control.

A kind of multi-channel television tuning demodulator of the utility model design comprises tuner, power divider, variable connector, single-chip microcomputer and the RS232 driver of a plurality of parallel connections; Its annexation is: the input of said power divider connects cable TV (CATV) radio frequency delivery outlet, and its output links to each other with the tuner of said a plurality of parallel connections; Said variable connector links to each other with the tuner of said single-chip microcomputer and a plurality of parallel connections respectively; This single-chip microcomputer links to each other with said RS232 driver, also links to each other with the tuner of a plurality of parallel connections by iic bus.

Operation principle of the present utility model is to utilize chip microcontroller RS232 communication protocol, obtains standard RS232C interface level by the RS232 drive circuit, thereby has realized the PC RCI; Single-chip Controlling 16 selects 1 switch to select the tuner that will operate, by the iic bus interface be provided with tuner receive frequency, obtain tuner operating state (locking carrier wave or losing lock), thereby realize the program control of No. 16 tuners.

Characteristics of the present utility model and technique effect:

The utility model utilizes 16 electric tuning television high frequencies of Single-chip Controlling head (TUNER), 16 tunnel TV signal of demodulation have simultaneously been realized, with the detection of video carrier, can utilize PC control setting receive frequency and detect no video carrier wave alarm by the RS232 interface.

Because this equipment adopts the serial port communicating protocol that is simple and easy to usefulness, can in software, realize being provided with frequency and detected carrier status function easily.

The utility model can be applied on the monitoring point in the wined tv monitoring network, the cable TV radiofrequency signal of the frequency division multiplexing of monitoring point (FDM) is demodulated to multichannel is looked, audio signal.The RS232 interface that provides can be connected with PC, thereby realizes long-range and program control.

Description of drawings

Fig. 1 is multi-channel television tuning demodulator structure of the present utility model and operation principle schematic diagram;

Fig. 2 is that multi-channel television tuning demodulator of the present utility model is used schematic diagram.

Embodiment is described in detail as follows with accompanying drawing in conjunction with the embodiments at multi-channel television tuning demodulator of the present utility model:

Structure of the present utility model comprises tuner, power divider, variable connector, single-chip microcomputer and the RS232 driver of a plurality of parallel connections as shown in Figure 1; Its annexation is: the input of said power divider connects cable TV (CATV) radio frequency delivery outlet, and its output links to each other with the tuner of said a plurality of parallel connections; Said variable connector links to each other with the tuner of said single-chip microcomputer and a plurality of parallel connections respectively; This single-chip microcomputer links to each other with said RS232 driver, also links to each other with the tuner of a plurality of parallel connections by iic bus.

The tuner of a plurality of parallel connections of present embodiment adopts rising sun light JS-6B111 tuner, single-chip microcomputer adopts PHILIPS87LPC764, variable connector adopts TI CD4067B16 to select 1 switch, 232 drive to adopt MAX232, power divider to adopt 2 of 1 of western shellfish board No. 2 power divider and No. 8 power dividers.

Wherein, the P1.0/P1.1 of single-chip microcomputer 87LPC764 configuration is UART (serial port), connects the T1IN/R10UT of MAX232; P1.2 is the clock (SCL) of IIC interface, connects the SCL of 16 JS-6B111; P1.3 is the data wire (SDA) of IIC interface, connects the input of CD4067B; The P0.0/P0.3 of configuration is an address selection line, connects the A/B/C/D address input of CD4067B, connects the SDA end (data wire of IIC) of CH0-CH15 to 16 JS-6B111 of CD4067 respectively.Like this, just can realize select the single channel tuner, frequency/read the carrier lock state is set,, just produce the carrierfree alarm signal, can pass through RS232 interface real-time report if the carrier lock state is losing lock (UNLOCK) by iic bus by programming.

The utility model is mainly used in as shown in Figure 2 the wined tv monitoring system.Among the figure, PC and multi-channel television tuning demodulator of the present utility model constitute a cover monitoring equipment, and this equipment can be installed in the place, arbitrfary point of cable TV network, comprises any node in wired TV station machine room, the distribution network, is used to receive the cable TV radiofrequency signal; This equipment links to each other with a data network (monitoring net) of realizing monitoring, administrative purposes by network interface simultaneously, thereby reaches the remote monitoring purpose.

If the local frequency of the tuner that the utility model adopts has covered 87.25MHz-903.25MHz (as the rising sun light JS-6B111 tuner of present embodiment), as long as above-mentioned monitoring equipment is passed through receiver, receive the TV RF signals of wireless transmission, equally also can be applied in the radiovision monitoring system.

Claims

1, a kind of multi-channel television tuning demodulator is characterized in that, comprises tuner, power divider, variable connector, single-chip microcomputer and the RS232 driver of a plurality of parallel connections; Its annexation is: the input of said power divider connects cable TV (CATV) radio frequency delivery outlet, and its output links to each other with the tuner of said a plurality of parallel connections; Said variable connector links to each other with the tuner of said single-chip microcomputer and a plurality of parallel connections respectively; This single-chip microcomputer links to each other with said RS232 driver, also links to each other with the tuner of a plurality of parallel connections by iic bus.

2, multi-channel television tuning demodulator as claimed in claim 1, it is characterized in that, said tuner adopts rising sun light JS-6B111 tuner, said single-chip microcomputer adopts PHILIPS 87LPC764, said variable connector adopts TI CD4067B16 to select 1 switch, said 232 drive to adopt MAX232, said power divider to adopt 2 of 1 of western shellfish board No. 2 power divider and No. 8 power dividers.

3, multi-channel television tuning demodulator as claimed in claim 1 is characterized in that, said iic bus is provided for the frequency of carrierfree alarm signal/read the carrier lock state, and this alarm signal is by RS232 interface real-time report.