CN2702557Y

CN2702557Y - Accompanying sound processing circuit for picture in picture television

Info

Publication number: CN2702557Y
Application number: CN 200420051909
Authority: CN
Inventors: 赵君财; 黄海华; 钟波
Original assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Current assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Priority date: 2004-06-26
Filing date: 2004-06-26
Publication date: 2005-05-25
Anticipated expiration: 2014-06-26

Abstract

Disclosed is an accompanying sound processing circuit for picture in picture television, which comprises an audio processing chip MSP34X0G. One path audio of the Tuner picture inputs into the audio processing chip in form of SIF. The other path audio of the Tuner inputs into the audio processing chip in manner of MONO, or the AV signal of the exterior of the SCART1 to the SCART4 inputs through the right and left channels. These two paths of inputs after respectively independently processed in the audio processing chip, via the internal register set selection, one path of which serving as primary output outputs to a loudspeaker and the other path outputs to an earphone. The DACM_L, the DACM_R and the DACM_C are the left channel output, the right channel output and the supper bass output of the main accompanying sound after processed. The DAC_L and the DAC_R are the right and left channels accompanying sounds of the son picture which are output into the PIP of the earphone. The accompanying sound between the main loudspeaker casing and the earphone can be freely exchanged. The utility model has the advantages of brief circuit, powerful function and capable effect of the audio processing, and can be widely applied to various picture in picture TV sets.

Description

The sound accompaniment treatment circuit of picture in picture TV set

Technical field

The utility model belongs to the TV set circuit technical field, more particularly relates to the improvement of the sound accompaniment treatment circuit of picture in picture TV set.

Background technology

General television set mostly is that sprite does not have audio frequency output when realizing picture-in-picture function.Even the television set sprite that has has output, circuit also is very loaded down with trivial details.And after key frame and sprite content exchange, the pairing audio frequency output of key frame and sprite also must correspondingly exchange, and circuit is therefore just more complicated.If add the corresponding input from audio signals such as YPBPR, RGB, DVI, complexity is just higher.

Summary of the invention

The purpose of this utility model, just be to overcome above-mentioned shortcoming and defect, make full use of the performance of acoustic processing chip MSP3450G, by this acoustic processing IC, receive the input signal of external various audio frequency terminals, corresponding selection and switching are carried out in pairing audio frequency input to key frame, sprite, and respectively the sound of key frame and sprite are carried out comparatively ideal audio and handle.

In order to achieve the above object, the utility model comprises the acoustic processing chip, and the acoustic processing chip is one of MSP34XOG chip series product.The sound of one road Tuner picture is with the form sound import process chip of SIF.The sound of another road Tuner is with the mode sound import process chip of MONO, or imports from SCART1 to SCART4 external AV signal left and right acoustic channels.The input of this two-way is at the acoustic processing chip internal respectively after the independent process, by its internal register selection is set and wherein one the tunnel exports loud speaker to as main, and another road then exports earphone to.

The acoustic processing chip is the MSP34XOG cake core.SIF_M and audio frequency _ P two paths of signals is respectively the form of SIF and the form of MONO, respectively through 67 pin and 60 pin that are capacitively coupled to MSP3450G.APC_L and APC_R are the left and right sound track signals of corresponding PC signal, import from 50,51 pin respectively.AV1_L and AV1_R are the left and right sound track signals corresponding to video AV1, import from 56,57 pin respectively.AV2_L and AV2_R are corresponding to the left and right sound track signals of video AV2 or high definition YPBPR input, import from 53,54 pin respectively.DACM_L, DACM_R and DACM_C are L channel, R channel and the supper bass output of main audio after treatment, and DAC_L and DAC_R are the left and right acoustic channels sound accompaniments of sprite when exporting the picture-in-picture of earphone to.

The utility model utilizes acoustic processing chip internal two independent sound processing path, to the sound accompaniment from key frame TUNER, adopts the output form of SIF; To sound accompaniment, then adopt the form of MONO output from sprite TUNER.Like this, can make full use of the MSP34XOG family chip can be handled another road MONO or SCART (dual track) input when handling one road SIF, second sound intermediate frequency characteristics, respectively main audio and sprite sound accompaniment be handled.And utilize the earphone output function of MSP34XOG, change the custom of generally earphone being followed the tracks of main audio output, the output of sprite when it is specifically designed to picture-in-picture.By such circuit, when we just can realize picture-in-picture state, what main sound box was exported was the sound accompaniment of key frame, and what earphone was exported is the sound accompaniment of sprite.And the sound accompaniment between main sound box and the earphone can freely be switched.

Task of the present utility model comes to this and finishes.

The utility model is by this picture-in-picture sound accompaniment processing mode, and available audio input interface is many, and the circuit of employing is simple, no longer needs the input of special audio frequency to switch chip, no longer needs to carry out separately the processing controls to the sprite sound accompaniment.Circuit is succinctly effective, and powerful, and the treatment effect of sound is good.It can be widely used in the various picture in picture TV sets.

Description of drawings

Fig. 1 is a functional-block diagram of the present utility model.

Fig. 2 is its circuit theory diagrams.

Embodiment

Embodiment 1.A kind of sound accompaniment treatment circuit of picture in picture TV set, as shown in Figure 1.Its acoustic processing chip is MSP34XOG chip (1).The sound of one road Tuner picture is with the form sound import process chip of SIF.The sound of another road Tuner is with the mode sound import process chip of MONO, or imports from SCART1 to SCART4 external AV signal left and right acoustic channels.The input of this two-way is at the acoustic processing chip internal respectively after the independent process, by its internal register selection is set and wherein one the tunnel exports loud speaker (2) to as main, and another road then exports earphone (3) to.

As shown in Figure 2.SIF_M and audio frequency _ P two paths of signals is respectively the form of SIF and the form of MONO, is coupled to 67 pin and 60 pin of MSP3450G (1) respectively through an electric capacity (4) and (5).APC_L and APC_R are the left and right sound track signals of corresponding PC signal, import from 50,51 pin respectively.AV1_L and AV1_R are the left and right sound track signals corresponding to video AV1, import from 56,57 pin respectively.AV2_L and AV2_R are corresponding to the left and right sound track signals of video AV2 or high definition YPBPR input, import from 53,54 pin respectively.DACM_L, DACM_R and DACM_C are L channel, R channel and the supper bass output of main audio after treatment, and DAC_L and DAC_R are the left and right acoustic channels sound accompaniments of sprite when exporting the picture-in-picture of earphone (3) to.

Embodiment 1 makes full use of the advantage of acoustic processing chip MSP3450G, and available audio input interface is many, and the circuit of employing is simple, no longer needs the input of special audio frequency to switch chip, no longer needs to carry out separately the processing controls to the sprite sound accompaniment.Circuit is succinctly effective, and powerful, and the treatment effect of sound is good.It can be widely used in the various picture in picture TV sets.

Claims

1. the sound accompaniment treatment circuit of a picture in picture TV set, it comprises the acoustic processing chip, it is characterized in that said acoustic processing chip is one of MSP34X0G chip series product, the sound of one road Tuner picture is with the form sound import process chip of SIF; The sound of another road Tuner is with the mode sound import process chip of MONO, or from the external AV signal left and right acoustic channels sound import process chip of SCART1 to SCART4; The input of this two-way is at the acoustic processing chip internal respectively after the independent process, by its internal register selection is set and wherein one the tunnel exports loud speaker to as main, and another road then exports earphone to.

2. according to the sound accompaniment treatment circuit of the described picture in picture TV set of claim 1, it is characterized in that said acoustic processing chip is the MSP34X0G chip, SIF_M and audio frequency P two paths of signals are respectively the form of SIF and the form of MONO, respectively through 67 pin and 60 pin that are capacitively coupled to MSP3450G, APC_L and APC_R are that the left and right sound track signals of corresponding PC signal is respectively from 50, the input of 51 pin, AV1_L and AV1_R are that left and right sound track signals corresponding to video AV1 is respectively from 56, the input of 57 pin, AV2_L and AV2_R are that left and right sound track signals corresponding to video AV2 or high definition YPBPR input is respectively from 53, the input of 54 pin, DACM_L, DACM_R and DACM_C are the L channels of main audio after treatment, the output of R channel and supper bass, DAC_L and DAC_R are the left and right acoustic channels sound accompaniments of sprite when exporting the picture-in-picture of earphone to.