CN2907121Y

CN2907121Y - TV set with multi-channel voice and intelligent video selection switching circuit

Info

Publication number: CN2907121Y
Application number: CNU2006200804278U
Authority: CN
Inventors: 刘俊; 刘旭凤; 郭富新
Original assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Current assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Priority date: 2006-01-25
Filing date: 2006-01-25
Publication date: 2007-05-30
Anticipated expiration: 2016-01-25

Abstract

The utility model discloses a TV which has a multi-video-and-audio intelligently selecting and switching circuit, comprising a main high frequency head, a sub high frequency head, an AV interface, an S video frequency interface, a PC sound interface, a high definition sound interface, a USB sound interface, a master plug, a sound processing plug and a video-and-audio selecting and switching plug. The audio and video signal output from the high frequency head and the interfaces are input into the input ends of the sound processing plug and selecting and switching plug, which outputs the selected sound signal and video signal through the output end of the selecting and switching plug under the role of selecting and switching and the TV programs are broadcast normally through the rear-end functioning circuit and the image processing circuit. The utility model increases the TV interfaces and expands the functions with low cost, which not only meets the adaptability of the liquid crystal TV to the external equipment, but also provides a new way for the future development of TV and facilitates the free choice of the users.

Description

Television set with multichannel sound, video intelligent selection hand-off process circuit

Technical field

The utility model belongs to the TV set circuit technical field, specifically, relates to a kind of TV set circuit that is used for, and realizes multichannel sound, video intelligent selection switching processing circuit.

Background technology

Develop rapidly along with application electric technology, new technology, emerging in large numbers fast of new product, various medium display terminals constantly enlarge its function, picture DVD, EVD, HVD, the interface that set-top box etc. provided is more and more, AV, the S terminal, the SCART output interface is all in continuous increase, but continuous expansion along with these medium display terminal functions, the input interface of television set also will increase accordingly, the interface and the display requirement that can adapt to modern media equipment like this, particularly high-end liquid crystal TV set, complete interface and the design that can supply to expand become requisite Consideration.But the increase of interface will inevitably bring the problem on the circuit design on the television set, and for example: the treatment channel of the chip of use is not enough, does not have enough input interface to connect the problems such as sound, video input of multichannel.If increase treatment channel by increasing signal processing chip, will inevitably bring on the circuit and cost on waste, so, realize collecting a plurality of interfaces and look for another way with regard to necessity in the design of same television set.

Summary of the invention

The utility model is not enough in order to solve in the prior art treatment channel of TV set circuit, there are not enough input interfaces to connect multichannel sound, video input, and come the problem that the extension process passage can bring to be wasted on circuit and the cost by increasing signal processing chip, provide a kind of novel TV machine multichannel sound, video intelligent to select the hand-off process circuit, the increase and the function expansion of television set interface have been realized by simple circuit configuration, help freely selecting of user, satisfied the adaptability of television set external equipment.

For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:

A kind of television set with multichannel sound, video intelligent selection hand-off process circuit comprises main tuner, sub-tuner, AV interface, S video interface, PC sound accompaniment interface, high definition sound accompaniment interface, USB sound accompaniment interface and main control chip and sound accompaniment process chip; Described sound accompaniment process chip comprises switch unit and processing unit, the input of described switch unit connects PC sound accompaniment interface, high definition sound accompaniment interface, USB sound accompaniment interface and from the radio frequency TV audio signal of main tuner and the output of sub-tuner, its output connects the input of a selector switch chip; Other road inputs of described selector switch chip also link to each other with AV interface, S video interface and from the radio frequency TV vision signal of main tuner and the output of sub-tuner respectively, its VT connects the subsequent image processing circuit, its key frame audio output connects the input of processing unit in the described sound accompaniment process chip, sprite audio output connexon channel headphones power amplifier; The output of processing unit connects audio amplifier power amplifier and earphone power amplifier respectively in the described sound accompaniment process chip; The bus end of described sound accompaniment process chip and selector switch chip is respectively by bus end corresponding be connected of iic bus with main control chip.

As further qualification to technique scheme, described AV interface comprises AV1 interface and AV2 interface, all link to each other with vision signal from the audio signal of AV1 interface with the input of described selector switch chip with the output of AV2 interface, key frame VEDIO signal, the y/c signal exported from the VT of selector switch chip connect numeral process chip line by line through Video Decoder, and then link to each other with main control chip; Sprite VEDIO signal, the y/c signal of output directly link to each other with main control chip through Video Decoder.

As the further qualification again to technique scheme, the model of described sound accompaniment process chip is MSP3460, and the model of selector switch chip is TA8850 or TA8851; From the key frame accompanying sound intermediate frequency signal of main tuner output with from the sprite accompanying sound intermediate frequency signal of sub-tuner output, the input that analoging sound signal is connected described sound accompaniment process chip respectively, from the main picture video signal of main tuner output be connected the input of described selector switch chip respectively from the sprite vision signal of sub-tuner output.

Compared with prior art, advantage of the present utility model and good effect are: the utility model is under the situation that the television set interface increases, the increase and the function expansion of interface have been realized with minimum cost, not only satisfied the adaptability of liquid crystal TV set to external equipment, help freely selecting of user, and, particularly needing the European machine of more interfaces for follow-up television set exploitation provides a kind of new thinking, this scheme is undoubtedly the higher selection of cost performance.The user needn't be again be that the television set interface is not enough worried, and how many costs of using liquid crystal TV set of the present utility model do not increase, and is suitable for the common consumer group, for it provides more interface, more function and more the enjoyment.

Description of drawings

Fig. 1 is the schematic diagram that multichannel sound in the utility model, video are selected commutation circuit;

Fig. 2 is the schematic diagram of rear end imaging signal processing circuit.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.

Several for video and audio signal no matter the port of front end input has, all be consistent in follow-up processing.And the signal processing circuit of television set rear end at most only need be handled two-path video signal and audio signal simultaneously.Based on this, the utility model has designed the switching circuit of a kind of sound, video intelligent selection, be used for television set multichannel sound, the vision signal of input are carried out the Intelligence Selection switching, make and have only the Voice ﹠ Video signal under current key frame and the sprite resource to be selected, enter the rear end passage and handle.Like this, just in the scheme before having avoided all input signals all are connected to the not enough problem of the passage that input interface caused of back-end processing chip.Using LCD TV circuitry of the present utility model forms by two ones: image signal processing section and Audio Signal Processing part.The picture signal that image signal processing section is mainly handled CVBS signal, y/c signal and imported from VGA, DVI interface; The main audio signal of handling each road interface input of Audio Signal Processing part.And the utility model was at first selected to handle to sound, vision signal before picture signal and Audio Signal Processing, and its annexation of selecting commutation circuit is referring to shown in Figure 1.

Among Fig. 1, the centralized control that is subjected to CPU in the main control chip is switched in the sound of key frame and sprite, the selection of vision signal, in being the selector switch chip N508 of TA8851, model includes variable connector, the signal that needs are selected to switch is connected to the input of selector switch chip N508 and selects output, thereby make output channel reduce, greatly reduce the processing burden of back-end circuit.In the utility model, can realize more multichannel input in order to make the color liquid crystal television set, be provided with radio frequency TV interface, AV1/AV2 interface, S video terminal and PC, high definition, USB sound accompaniment interface on television set, the sound of each interface output, the concrete annexation of vision signal are:

1, radio frequency TV audio signal

Owing to will realize the radio frequency picture-in-picture function, so used double high-frequency head, the accompanying sound intermediate frequency signal SIF_M of main tuner output key frame, the accompanying sound intermediate frequency signal SIF_P and the analoging sound signal MONO_P of sub-tuner output sprite are that the sound accompaniment process chip N506 of MSP3460 links to each other with model all.In described sound accompaniment process chip N506, include switch unit and processing unit, the input of described accompanying sound intermediate frequency signal SIF_M, SIF_P and analoging sound signal MONO_P connection switching unit, after decoding, pre-processing and amplifying, under the control action of main control chip, after selecting with PC, high definition, USB audio signal, enter the input of diverter switch chip N508, select output with other sounds, vision signal.

2, PC, high definition, USB audio signal

PC audio signal VGA_L/R, high definition audio signal YCBCR_L/R and USB audio signal DMP_L/R all are directly connected to the input of switch unit among the sound accompaniment process chip N506, carry out A/D conversion, pre-processing and amplifying and signal by sound accompaniment process chip N506 and select.Main control chip is selected signal by iic bus to sound accompaniment process chip N506 output, each the road audio signal that is input among the sound accompaniment process chip N506 is selected output, and then after the D/A conversion, export the input that two-way voice signal TVM_L/R, TVP_L/R enter selector switch chip N508.

3, AV1, AV2 vision signal and audio signal

From AV1, the audio signal SC1_AINL/R of AV2 interface output, SC2_AINL/R directly enters the input of selector switch chip N508, with the two-way voice signal TVM_L/R after the above-mentioned process sound accompaniment process chip N506 selection processing, TVP_L/R selects in selector switch chip N508, output two-way audio signal S8850_L/R, PIP_L/R, wherein, audio signal S8850_L/R is input to the input of processing unit among the sound accompaniment process chip N506, it is carried out the A/D conversion, the pre-amplification, input is selected, high bass is handled, balance is selected, volume control, the D/A conversion, the audio signal AOUT_L/R of output main channel enters audio amplifier power amplifier TDA7266 respectively and earphone power amplifier TDA2822M carries out processing and amplifying, at last by audio amplifier and earphone output sound signal.Another road audio signal PIP_L/R carries out processing and amplifying directly for subchannel earphone power amplifier TDA7053, outputs to the sprite earphone at last.Enter the input of selector switch chip N508 respectively from the vision signal S_VEDIO of vision signal AV1_VEDIO, the AV2_VEDIO of the output of AV1, AV2 interface and the output of S terminal, select to switch with other sound, vision signal.

4, radio frequency TV signal

The multi-modulation scheme integral high frequency head is adopted in the reception of radio frequency TV signal and processing, the CVBS signal of these two tuner outputs is respectively as the CVBS signal TVM_CVBS of master, sprite, the input that TVP_CVBS enters selector switch chip N508, with other vision signal, under the iic bus control of main control chip, main picture video signal V_M, Y_M, C_M and sprite vision signal V_P, Y_P, C_P after selecting are outputed in the image output circuit of rear end.

The imaging signal processing circuit of rear end and existing scheme are similar substantially, as shown in Figure 2.Switch because carried out the selection of sound, video at front end, therefore reduced the input signal of rear end integrated circuit, make signal processing more convenient, peripheral circuit also had its corresponding simplified.Specifically, the main picture video signal V_M that exports from selector switch chip N508 is connected numeral process chip N015 line by line with bright signal Y_M, C_M through decoder N006, and then exports main picture image by liquid crystal display screen under the control of controller N012.And directly be connected controller N012 with bright signal Y_P, C_P through decoder N010, and then by liquid crystal display screen output sub-screen image from the sprite vision signal V_P of selector switch chip N508 output.In addition, high-definition video signal Y1, PB1/CB1, PR2/CR2 and under a road selected vision signal Y of output under the switching effect of selecting chip N004, PB/CB, PR/CR and the effect of selecting chip N003 from the vision signal of VGA interface, switch output from vision signal Y21, the PB2/CB2 of multimedia player, PR2/CR2, and then under the control of controller N012, pass through the liquid crystal display screen outputting video signal.

The utility model rationally utilizes integrated chip TA8851 and MSP3460, and described chip has the iic bus interface, receives the control command that main control chip sends by iic bus.When the user is switched television set to current data resource, main control chip can be discerned user's operation under the control of software, obtain current master, sprite resource information, thereby send corresponding instruction, selected switch chip TA8851 receives by iic bus, selector switch chip TA8851 opens inner corresponding switch, realizes the selection of multichannel sound, vision signal is switched with this.

The utility model has taken into full account the expansion of circuit design in circuit design, also reserved the usefulness of multichannel interface for the subsequent conditioning circuit improvement in selector switch chip TA8851.In the delivery outlet of selector switch chip TA8851, designed the corresponding driving circuit strengthening load capacity, thereby realized perfect on the circuit.

Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.

Claims

1. one kind has the multichannel sound, video intelligent is selected the television set of hand-off process circuit, comprise main tuner, sub-tuner, the AV interface, the S video interface, PC sound accompaniment interface, high definition sound accompaniment interface, USB sound accompaniment interface and main control chip and sound accompaniment process chip, it is characterized in that: described sound accompaniment process chip comprises switch unit and processing unit, the input of described switch unit connects PC sound accompaniment interface, high definition sound accompaniment interface, USB sound accompaniment interface and from the radio frequency TV audio signal of main tuner and sub-tuner output, its output connects the input of a selector switch chip; Other road inputs of described selector switch chip also link to each other with AV interface, S video interface and from the radio frequency TV vision signal of main tuner and the output of sub-tuner respectively, its VT connects the subsequent image processing circuit, its key frame audio output connects the input of processing unit in the described sound accompaniment process chip, sprite audio output connexon channel headphones power amplifier; The output of processing unit connects audio amplifier power amplifier and earphone power amplifier respectively in the described sound accompaniment process chip; The bus end of described sound accompaniment process chip and selector switch chip is respectively by bus end corresponding be connected of iic bus with main control chip.

2. the television set with multichannel sound, video intelligent selection hand-off process circuit according to claim 1, it is characterized in that: described AV interface comprises AV1 interface and AV2 interface, all link to each other with the input of described selector switch chip with vision signal from the audio signal of AV1 interface with the output of AV2 interface, the VT output key frame VEDIO signal of selector switch chip, y/c signal are connected the subsequent image processing circuit with sprite VEDIO signal, y/c signal.

3. the television set with multichannel sound, video intelligent selection hand-off process circuit according to claim 2, it is characterized in that: key frame VEDIO signal, the y/c signal exported from the VT of described selector switch chip connect numeral process chip line by line through Video Decoder, and then link to each other with main control chip; Sprite VEDIO signal, y/c signal directly link to each other with main control chip through Video Decoder.

4. according to claim 2 or 3 described television sets with multichannel sound, video intelligent selection hand-off process circuit, it is characterized in that: described main tuner output key frame accompanying sound intermediate frequency signal and main picture video signal, sub-tuner output sprite accompanying sound intermediate frequency signal, analoging sound signal and sprite vision signal; The vision signal of key frame and sprite is connected the input of described selector switch chip respectively, and its accompanying sound intermediate frequency signal and analoging sound signal are connected the input of described sound accompaniment process chip respectively.

5. the television set with multichannel sound, video intelligent selection hand-off process circuit according to claim 4, it is characterized in that: the model of described sound accompaniment process chip is MSP3460, the model of selector switch chip is TA8850 or TA8851.