CN101917172A

CN101917172A - System for automatically detecting signal sources

Info

Publication number: CN101917172A
Application number: CN2010102573743A
Authority: CN
Inventors: 杨炼
Original assignee: ZHONGSHAN MG AUDIO DEVELOPMENT Co Ltd
Current assignee: ZHONGSHAN MG AUDIO DEVELOPMENT Co Ltd
Priority date: 2010-08-19
Filing date: 2010-08-19
Publication date: 2010-12-15

Abstract

The invention relates to a system for a home theater amplifier to automatically detect signal sources. The system comprises a CPU 1, an input selector 2, a reverse adder 3, a controllable gain amplifier 4, a multichannel volume controller 6, a signal amplifier 7, a mute circuit 8 and a power amplifier 9. A circuit can automatically search the signal source without user intervention while in use, the amplifier configured with the system circuit can automatically search effective signals through correct wiring as long as the amplifier is powered on and any signal source such as DVD and the like is played; when powered on, the amplifier can automatically recover to the last playing state; and the amplifier can automatically find the signal sources once again as long as an automatic searching key is pressed after other input channels are switched to, so that a user can use the amplifier with high proficiency.

Description

The system in a kind of automatic detection signal source

Technical field

The present invention is a kind of device of detection signal, is specifically related to a kind of system that is used for the automatic detection signal source of home theater power amplifier.

Background technology

Continuous increase along with the home theater product function, the operation of power amplifier product becomes increasingly complex, often have only skilled the operating of professional person and fan ability, have many consumers and buy wiring energising back back home owing to can not operate, several hrs does not all have voice output, the product that has not only will be selected the input of corresponding wiring on panel, also to select numeral or analog input again, selecting Doby still is the DTS decoding, what have also will be the switch opens of loudspeaker, and these switches are all must be one by one corresponding, otherwise all can't operate as normal, this complicated operations all has suitable difficulty for young man in the family, more leisure opinion old man or child.

Summary of the invention

In order to overcome the deficiency of existing Related product, reduce the complexity of operation, improve degree easy to use, the invention provides and a kind ofly can need not the circuit that user intervention just can search signal source automatically, disposed the power amplifier of this circuit, through correct wiring, as long as opening power, any signal source such as DVD playing back, power amplifier just can search useful signal automatically, and Auto Power On returns to the state of playing last time, as long as press automatic search key after switching to other input channels, can find signal source once more automatically, it is handy that the user is used.

The product that has disposed this circuit has obtained user's favorable comment, and is greatly convenient for users to use, and the utility model is a kind of technological innovation in the industry.

The technical solution adopted for the present invention to solve the technical problems is:

The system in a kind of automatic detection signal source, it comprises:

One CPU is used for control and sends signal instruction, carries out signal selection and circuit control;

One mute circuit receives the MUTE instruction of CPU output, and input is quiet;

One reverse adder adds calculation process to the signal that receives;

One multichannel volume controller connects input selector, and is controlled by CPU;

One signal amplifier connects the multichannel volume controller, and amplifying signal is input to mute circuit;

One power amplifier connects mute circuit, and the signal from mute circuit is carried out power amplification handle, and final output;

One input selector receives the instruction of CPU, selects the signal input part terminal, and the signal of selecting is delivered to the multichannel volume controller, and signal is input to reverse adder;

One controllable gain amplifier, the reverse adder of reception process adds signal together, through reading by the A/D input port of CPU after the gain processing and amplifying.

Preferably, said system also comprises the VFD display screen, is used for the display channel title.

Preferably, will compare judgement, when the signal amplitude value surpasses threshold value, judge that current input has the signal input, otherwise think and no signal switch to next group input through data and the set point that read the A/D input port of CPU.

Preferably, with the deterministic process repetitive cycling, till judging that current input has the signal input, and carry out following steps:

Step 1, start;

Step 2, CPU sends instruction, and it is quiet to remove the power amplifier input by mute circuit;

Step 3 is faded in volume numerical value, prevents that sound from strengthening suddenly.

Preferably, have the following steps after above-mentioned steps one: the VFD display screen is lighted in control, the tunnel name that prompting inserts.

Compare with background technology, the present invention has following advantage:

(1) need not the circuit that user intervention just can search signal source automatically, disposed the power amplifier of this circuit, through correct wiring, as long as opening power, any signal source such as DVD playing back, power amplifier just can search useful signal automatically, and Auto Power On returns to the state of playing last time, as long as after switching to other input channels, press automatic search key, can find signal source once more automatically.

(2) detect the existence of signal source accurately and effectively, and insert, need not user intervention and can enter operating state.

Description of drawings

Fig. 1 is a principle of the invention block diagram;

Fig. 2 imports selection portion parallel circuit figure for the present invention;

Fig. 3 detects the control section circuit diagram for the present invention.

Reference numeral: 1-CPU; The 2-input selector; The reverse adder of 3-; The 4-controllable gain amplifier; The 5-A/D input port; 6-multichannel volume controller; The 7-signal amplifier; The 8-mute circuit; The 9-power amplifier.

Embodiment

Understand and enforcement the present invention for the ease of those of ordinary skills, the present invention is described in further detail below in conjunction with the drawings and the specific embodiments.

Be illustrated in figure 1 as theory diagram of the present invention, this system is constituted, and between CPU1 and controllable gain amplifier 4 A/D input port 5 is arranged by CPU 1, input selector 2, reverse adder 3, controllable gain amplifier 4, multichannel volume controller 6, signal amplifier 7, mute circuit 8, power amplifier 9.CPU 1 is used for control and sends signal instruction, carries out signal selection and circuit control; Input selector 2 receives the instruction of CPU1, selects the signal input part terminal, and the signal of selecting is delivered to multichannel volume controller 6, and signal is input to reverse adder 3; Oppositely adder 3 adds calculation process to the signal that receives; Controllable gain amplifier 4, the reverse adder 3 of reception process adds signal together, through reading by the A/D input port 5 of CPU1 after the gain processing and amplifying; Multichannel volume controller 6 connects input selector 2, and is controlled by CPU1; Signal amplifier 7 connects multichannel volume controller 6, and amplifying signal is input to mute circuit 8; Mute circuit 8 receives the MUTE instruction of CPU1 output, and input is quiet; Power amplifier 9 connects mute circuit 8, and the signal from mute circuit 8 is carried out power amplification handle, and final output.This system also comprises VFD display screen (not shown), has connected useful signal on passage, and system controls immediately and lights the VFD display screen, the tunnel name that prompting inserts.

When enforcement is of the present invention, following process is arranged: after the start that powers on, CPU1 at first sends the MUTE instruction, by mute circuit 8 that the input of power amplifier is quiet, send commands for controlling input selector 1 again and select a certain group of signal terminal, deliver to multichannel volume controller 6 through the signal of selecting and carry out the integrated treatment of multichannel volume, add together through anti-phase adder 3 simultaneously, delivering to the A/D line through may command gain amplifier 4 backs by the A/D input port of CPU1 reads, and with read value and set point contrast, in the present embodiment, as long as signal amplitude thinks promptly that greater than 50mV current input has signal input (can prevent from like this to disturb), promptly do not think and no signal switch to next group input again if reach this amplitude, so analogize, till finding signal start, find the signal start after, remove the quiet of power amplifier input, again volume numerical value is faded in, prevent that sound from strengthening suddenly.

As shown in Figure 2, many group signal input terminals are connected to integrated circuit U1 R2S15205, this integrated circuit is integrated 8 sound channel electronic sound volumes and many group selections switch, carry out anti-phase mixing through the signal after selecting by U2, mixed signal returns U1 again and selects the back from PIN4 output (LEV_O), PIN42, PIN43 are the communication port lines of U1, accept the instruction from CPU; The amplifier that LEV_O delivers to the controllable gain of being made up of U3, Q1 among Fig. 3 amplifies back generation AD_0 signal, the PIN14 A/D mouth line that is connected to U4 CPU reads amplitude, if signal amplitude is less than 50mV, then think no signal input, promptly switch to next input port, repeat above process to have judged whether the signal input, so repeatedly; Promptly think greater than 50mV when amplitude to have connected useful signal on the prepass, the VFD display screen is lighted in control immediately, and the tunnel name that prompting inserts is decontroled the mute signal of power amplifier input, and volume numerical value fades in, and music is sounded gradually.

The used integrated circuit of the utility model, triode, capacitance resistance ware, CPU etc. are normal component, according to the given technology connectivity scenario of this specification can be complete be processed into the present invention.

The above, only be in order to concrete case study on implementation of the present invention to be described, but be not in order to limit practical range of the present invention, such as those skilled in the art must be covered by the scope of claim of the present invention not breaking away from all equivalence changes of being finished under indicated spirit of the present invention and the principle or modifying.

Claims

1. the system in an automatic detection signal source, it is characterized in that: it comprises:

One CPU (1) is used for control and sends signal instruction, carries out signal selection and circuit control;

One mute circuit (8) receives CPU(1) the MUTE instruction of output, input is quiet;

One reverse adder (3) adds calculation process to the signal that receives;

One multichannel volume controller (6) connects input selector (2), and by CPU(1) control;

One signal amplifier (7) connects multichannel volume controller (6), and amplifying signal is input to mute circuit (8);

One power amplifier (9) connects mute circuit (8), and the signal from mute circuit (8) is carried out power amplification handle, and final output;

One input selector (2) receives CPU(1) instruction, select the signal input part terminal, and the signal of selecting delivered to multichannel volume controller (6), and signal is input to reverse adder (3);

One controllable gain amplifier (4) receives through reverse adder (3) and adds together signal, through passing through CPU(1 after the gain processing and amplifying) A/D input port (5) read.

2. the system in automatic detection signal according to claim 1 source is characterized in that: described system also comprises the VFD display screen, is used for the display channel title.

3. the system in automatic detection signal according to claim 1 and 2 source, it is characterized in that: will be through CPU(1) A/D input port (5) data and the set point that read compare judgement, when the signal amplitude value surpasses threshold value, judge that current input has the signal input, otherwise think and no signal switch to next group input.

4. the system in automatic detection signal according to claim 3 source is characterized in that: with described deterministic process repetitive cycling, till judging that current input has the signal input, and carry out following steps:

Step 1, start;

Step 2, described CPU(1) send instruction, it is quiet to remove the power amplifier input by described mute circuit (8);

5. the system in automatic detection signal according to claim 4 source is characterized in that: have the following steps after described step 1: the VFD display screen is lighted in control, the tunnel name that prompting inserts.