一种音频控制电路
Technical field The present invention relates to an audio control circuit, in particular to a power supply and the computer system can accept auxiliary power supply of the computer audio frequency compiling chip ( Codec Audio), power off the computer system can continue to work independently, the audio control circuit of the playing and processing, belongs to the field of electronic technology. Background technology The personal computer function of the speed of the hardware requirements for the promotion, and increasingly rich multimedia software application, therefore, for an audio system relative to the quality are also required to be improved. Information of the computer to a digital (Digital), but we hear sound for the simulation (Analog), therefore in the sound processing, must be converted into analog and digital to analog conversion into a digital signal processing, the sound card on the assembly of the charge of this work is the audio compiler ( Codec Audio). The formulation of a set of Intel (INTEL) the standard of an audio system, the audio system is Codec Audio ' 97, the most significant feature of the system lies in the audio system of the analogue circuit is on a single chip, can be reduced by using such a structure of the analog signal the interference of the digital signal, in order to improve the personal computer of the audio signal-to-noise ratio (SNR, Signal-to-Noise Ratio) (the commercial products can be achieved in 90db SNR), and then become a personal computer is currently the mainstream of the audio system constructor deployed. On the other hand, the operating system of the personal computer, has proposed a set of standard PC power management (Power Management), wherein with a special set of specifications, in the state of the computer for the is not opened, allows the computer within an auxiliary power supply to support the function of the wake-up (Wake-Up) system. By means of the function, all multimedia developer to obtain a greater diversity of application. The power supply system as described above, as a result, some computer manufacturers has developed a kind of power supply is turned off can be still the function of playing music CD, known as the system power supply is turned off can be playing function of the CD ( CD Off Power), that is, the computer system under the non-activated conditions, to provide an auxiliary power supply is connected to the CD-ROM drive (CD-ROM), the users still can be used for playing music CD CD-ROM drive. However because Codec Audio ' 97 standard specification is simple audio application, therefore were usually in the audio frequency compiling chip the use of external additional switch and power amplifier to match audio frequency compiling chip, to reach under the system power supply is turned off can be playing function CD. Please refer to fig. 1, in the prior use of the external power amplifier to match audio frequency compiling chip in order to reach the system power supply is turned off can be CD playing function of the audio control circuit. As shown in fig. 1, audio control circuit includes an audio compiler 3 and an audio frequency power supply control circuit 2, audio compiler 3 is mainly audio frequency compiling chip 30 a by the, audio-frequency power supply control circuit 2 mainly comprises two switch circuit 23, 24, a voltage-dividing circuit 25 and two power amplifier circuit 21, 22 formed by, two amplifier circuit is respectively connected to amplifying circuit 1st 21 and 2nd amplifying circuit 22, 1st amplifying circuit 21 to the left channel ( Channel Left) audio be amplified and via a 1st switch circuit 23 to control its conduction, 2nd amplifying circuit 22 for the right channel ( Channel Right) audio be amplified and by a 2nd switch circuit 24 to control its conduction, 1st switch circuit 23 (PWOFFCD_L) is connected to the output end of a left channel loudspeaker 26, 2nd switch circuit 24 (PWOFFCD_R) is connected to the output end of a right-channel loudspeaker 27. Furthermore, audio frequency compiling chip 30 CD-L the signal pin, 1st CD-R are respectively connected to the amplifying circuit 21 and 2nd amplifying circuit 22 of an input terminal, audio frequency compiling chip 30 signal pin of the other two only OUT-L, left loudspeaker OUT-R are respectively connected to the loudspeaker 26 and 27. In addition there are several power supply signal pin is respectively 3.3Vdigital, 5Vaux, 5Vaudio, and so on, an audio frequency coding circuit 3 and audio-frequency power supply control circuit 2 sharing 3.3Vdigital and 5Vaudio two power supply signal pin. But the use of the above-mentioned circuit structure, because it can only get cdroms left channel and right channel output, it is unable to prevent the noise produced by the rotation of the CD-ROM drive (Noise). Furthermore, due to audio power supply control circuit is applied, therefore an audio system with a relatively large number of components, cost is comparatively expensive to use, and this invention is in the two shortcomings of the design and the further improved. The content of the invention The main purpose of this invention is to provide an audio control circuit, the external switch circuit can be used to integrate a number of the audio frequency compiling chip design ( Codec Audio) internal, to design a integrated power supply selection control function, the power supply is turned off in order to achieve system playing function of independently. Another purpose of this invention is to provide an audio control circuit, the system power supply and the auxiliary power supply input, the audio frequency compiling chip, the power supply is turned off the system, can still processing an audio signal. Another purpose of this invention is to provide an audio control circuit, from the input end of the output of the player-CD-ROM containing a reference of the optical drive signal to ground, and with the left-channel audio signal of the right channel audio signal with design, can effectively inhibit player-the noise produced by the CD-ROM drive, can be obtained in this way a better audio output effect. Another purpose of this invention is to provide an audio control circuit, save the number of components, simplify circuit design complexity in order to reach the relatively reduce the expenditure of cost. In order to achieve the above object, in the 1st preferred embodiment, the structure of this invention comprises a power supply circuit and a audio compiler control chip. Audio compiler control chip includes a audio compiling circuit and a control amplifier circuit. Wherein the power supply circuit provides audio compiler control chip power supply; control amplifying circuit, receiving an audio signal, and an audio translation circuit is connected with the power supply circuit, and amplifying the output of the audio signal. The oil, the power supply circuit includes a power supply circuit and a switch circuit, the power supply isolation circuit can provide different power supply isolation, and is composed of a plurality of Schottky diode, the switch circuit provides a power selection, by at least one of a metal oxide semiconductor field effect transistor. Wherein the power supply circuit includes a 1st and 2nd Schottky diode, a Schottky diode, the 1st 2nd Schottky diode connected in series with the Schottky diode, its string contact is connected to the audio coding/control circuit, the 2nd Schottky diode is connected to one end of the MOS transistor. The oil, the audio translation circuit is a audio compiler ( Codec Audio) circuit. The oil, the control amplification circuit includes a 1st amplifying circuit, a 2nd amplifying circuit, an amplifying circuit and a 3rd 4th amplifying circuit, wherein the 1st and 2nd amplifying circuit is connected in series with the amplifying circuit, and processing the audio signal of the channel signal 1st; the 3rd and 4th amplifying circuit is connected in series with the amplifying circuit, and processing the audio signal of the channel signal 2nd. In order to achieve the above-mentioned purpose, in another preferred embodiment, the invention can be integrated in a chip, the chip includes a power supply selection circuit and an audio translation/control circuit, the power supply selection circuit that is, the 1st preferred embodiment of the power supply circuit is integrated in one chip, audio frequency compiling/control circuit if better 1st audio frequency compiling the embodiment of the internal circuit of the control chip, comprises a audio compiling circuit and a control amplifier circuit. According to the above-mentioned technical scheme analysis, the invention has the following advantages: it will be a number of external switch circuit design can be used to integrate the audio translation chip ( Codec Audio) internal, the audio control circuit is usually of more than one integrated the power supply selection control function, so as to realize the power supply is turned off the system, can still be the purpose of processing an audio signal. At the same time, the signal connection mode of the present invention can effectively inhibit the noise generated by the player, an audio output effect is excellent. Furthermore, the circuit of this invention the structure is simplified, the cost is low. Figure description Figure 1 is a circuit chart of the existing audio system. Figure 2 for this invention is in the audio frequency compiling chip during the use of the external power supply circuit of a preferred embodiment. Figure 3 to the invention is in the audio frequency compiling the chip has a power supply control circuit for a preferred embodiment. Figure 4 is a power control state diagram of the present invention has a power supply control circuit table a preferred embodiment. Figure 5 is a power amplifier of the present invention using selective power supply of a preferred embodiment. Figure 6 according to the audio signal for this invention using selective power supply output path of a preferred embodiment of the. By proper Figure number: 1-an audio circuit 2-audio power supply control circuit The amplifying circuit 21-1st 22-2nd amplifying circuit The switch circuit 23-1st The switch circuit 24-2nd 25-a voltage dividing circuit 3-audio compiler 30-audio control chip 4-audio control circuit The horn circuit 40-1st The horn circuit 41-2nd 5-power supply circuit 50-power isolation circuit 500,501-Schottky diode 51-switch circuit 510-MOSFET transistor 6-audio coding/control chip 60-audio coding circuit 61-control amplifying circuit Amplifying circuit 610-1st 611-2nd amplifying circuit 612-3rd amplifying circuit 613-4th amplifying circuit 614,615,616, 617-mute switch 7-power supply control circuit 70, 71, 72, 78, 79-resistance 73, 74, 75, 76, 77-MOSFET transistor 700,701,702-power amplifier 8-audio frequency compiling/control chip 80-audio control circuit 9-audio encoding control circuit Specific embodiments The Figures and in particular with the embodiment of the present invention is used as described further in detail. In the present invention 1st preferred embodiment, lies in the original location in the audio frequency compiling outside of chip can be used to integrate the switch circuit of the new design of the internal part of the audio frequency compiling chip audio system forms a new compile chip, may retain the original audio to compile all the functions of the chip, and at the same time still can reach system of the power supply is turned off can be playing function CD ( CD Off Power), and keeps a power supply circuit to remain in the new compiled chip external audio system. Please refer to fig. 2, for this invention is in the audio frequency compiling chip using a external power supply circuit of a preferred embodiment. The inventive audio control circuit 4 includes a power management device (, in other words the power supply circuit 5) and an audio translation/control chip 6, the power supply circuit 5 can be input 5Vaux power supply, 5Vaudio power supply and 3.3Vdigital power supply, and selected to provide 5Vaux power supply or 5Vaudio power to the audio frequency compiling/control chip 6. Audio frequency compiling/control chip 6 includes an audio frequency coding circuit 60 and control amplifying circuit 61, the power supply circuit 5 for providing the audio frequency compiling/control chip 6 various types of power supply. The audio coding circuit 60 can in the prior an audio translation chip ( Codec Audio) circuit. Control amplifying circuit 61, the CD-ROM drive from CD-L, CD-R, CD-GND and other audio signal, and is connected with the power source circuit 5, and amplifying the audio signal can be controlled and the output. The better the design of the embodiment can form a audio frequency compiling/control chip or audio frequency compiling/control IC, the audio translation/control IC includes the existing audio frequency compiling chip ( Codec Audio) power supply circuit and the circuit of the 5 input part. Furthermore, control amplifying circuit 61 Out-L audio signal can be output, the horn circuit Out-R to a 1st 2nd 40 and a horn circuit 41. On the power supply circuit 5 part, comprises a power supply circuit 50 and a switching circuit 51, power supply circuit 50 includes a 2 a Schottky diode (Schottky Diode Barrier) 500,501 can provide 5Vaux power supply and 5Vaudio isolation of the power supply, the switching circuit 51 includes a metal oxide semiconductor field effect transistor (MOS FET) 510. The Schottky diode 1st 500 with the 2nd the cathode of the Schottky diode 501 is connected with the cathode of, Schottky diode 500 a is connected with the anode of 5Vaudio power supply, Schottky diode 1st 500 with the 2nd the cathode of the Schottky diode 501 is connected to the connection point of the audio frequency compiling/control chip 6, MOS transistor 510 to N channel, at the same time drain electrode is connected to the 2nd Schottky diode 501 of the anode. Furthermore, on the part of the power supply pins, are respectively provided with 3.3Vdigital, 5Vaux and 5Vaudio three power supply input, wherein 3.3Vdigital of the audio and digital circuit working power supply of the chip, 5Vaux an auxiliary power supply, 5Vaudio working power supply to an analog circuit, 3.3Vdigital is connected to the audio frequency compiling/control chip 6 and MOS transistor 510 gate, 5Vaudio 1st Schottky diode to the input 500 of the anode, 5Vaux is connected to the MOS transistor 510 and the source of input to the audio frequency compiling/control chip 6. 5Vaux power supply is power off the computer system can continue to provide control amplifying circuit 61 of the power supply. On control amplifying circuit 61 part, by the power amplifier as the main form the assembly, which comprises a 1st amplifying circuit 610, a 2nd amplifying circuit 611, the amplifying circuit 3rd 4th amplifying circuit a 612 and 613. Wherein the 1st amplifying circuit 610 and the 2nd amplifying circuit 611 via a mute switch 614 are connected in series, and processing from the CD-ROM (CD-ROM drive is not in Figure 2 for displaying) the audio signal of the channel signal 1st (CD-L), (CD-L) connected to the 1st 1st-channel signal amplifying circuit 610 of the input end of the 1st, 2nd and the amplifying circuit 611 is connected with the output end of a mute switch 615, via the mute switch 615 after (Out-L) an audio signal can be output, and is connected with the 1st horn circuit 40. The amplifying circuit 3rd 4th amplifying circuit the 612 and 613 via a mute switch 616 are connected in series, and processing from an audio signal transmitted from the CD-ROM drive of the channel signal (CD-R) 2nd, 2nd-channel signal is connected to the amplifying circuit 3rd (CD-R) 612 of the input end of the 1st, 4th and the amplifying circuit 613 is connected to the output end of a mute switch 6 17, via the mute switch 617 later, in other words (Out-R) an audio signal can be output, and is connected to the 2nd horn circuit 41. Wherein from the CD-ROM by a grounding signal amplifying circuit 1st (CD-GND) are respectively connected to the amplifying circuit 610 and 3rd 612 of the input end of the 2nd. The other and in the present invention a preferred embodiment of the invention, as a preferred embodiment, audio system circuit of the present invention the structure is characterized in that a number of the external switch to the original circuit design can be used to integrate a audio frequency compiling chip ( Codec Audio) the internal part of the audio form a new compile chip, Audio Codec entirely consistent with ' 97 standard, and at the same time still can reach system power supply is turned off can be playing function of the CD, different the same, no additional power supply circuit is connected with the new audio frequency compiling chip external, power supply circuit has been built-in in the audio system in the circuit structure, a plurality of power supply control conditions by the design in order to achieve the purpose of the connection of the auxiliary power supply. New audio system compiling chip still comprises a the original audio frequency compiling chip, in order to form an audio system of the present invention the internal circuitry of the circuit structure. Please refer to fig. 3, for this invention is in the audio frequency compiling chip built-in power supply circuit of a preferred embodiment. As shown in Figure 3, the power supply circuit built-in in the present invention can be implemented by an audio frequency compile/control chip 8 in, wherein the audio encoding control circuit 9 and the working principle of the structure substantially as shown in Figure 2 is shown in the audio coding/control chip 6, power supply control circuit 7 that is, the Figure 2 in the power supply circuit 5 further design, the integration in fig. 3 shown in the audio frequency compiling/control chip 8 in, also can be in the production of the chip in the semiconductor device manufacturing process to be made at the same time, without-like Figure 1 or Figure 2 in the outside of the chip shall be stated still is connected with a plurality of the electronic component. Please refer to fig. 4, for this invention is in the audio frequency compiling chip has an internal power source circuit diagram of a power control state of a preferred embodiment. The power supply control circuit 7 will be designed of 5Vaux and 5Vaudio be selective for controlling a power source state, as shown in Figure 4, power supply 5Vaudio via a resistor 70 to ground, power supply 5Vaux via a resistor 71 ground, and 5Vaudio connected to a MOS transistor 73 of the gate, 5Vaux via a resistor 72 connected to the MOS transistor 73 to draw, the MOS transistor and 73 to draw a signal VC, VC can recognize whether the state of using the auxiliary power supply, the power supply control state may be used by a right power control state table display. If the power control state table, when the 5Vaux and 5Vaudio are logic low potential "0 the when [...] , and has no system power supply to said auxiliary power supply, the power supply state is not turned on (OFF), VC low potential for the logic signal is" 0 the [...]. When the 5Vaudio to logic low potential "the 0 [...] , but 5Vaux to a logical high potential" 1 the when [...] , said auxiliary power supply used at that time, that is, of the computer power supply and is not opened the main system, for universal auxiliary power supply, signal VC to a logical high potential " the 1 [...]. When the 5Vaudio to a logical high potential "1 the when [...] , that is the input power state to a normal state (NORMAL), CD-ROM drive that at this moment the computer system power supply is started up, the signal VC to logic low potential" the 0 [...]. Please refer to Figure 5 and Figure 6, the power amplifier of the present invention using selective power supply of a preferred embodiment. As shown in Figure 5, the power amplifier 7 00 means using chart 3 when the preferred implementation, because the power supply state 5Vaudio and 5Vaux the logic of the switching between high and low potential, so the power amplifier 700 can be using the power supply of the Figure 5 design, utilize MOSFET74, 75 is connected to the power amplifier 700 a power supply input terminal, using 5Vaudio, VC signal in order to control the potential state of MOSFET74, 75 on or not, that is, can selectively change the power amplifier 700 for the using power 5Vaudio or 5Vaux. Please refer to fig. 6, of the invention in accordance with the use the selective power sound intermediate frequency signal output path of a preferred embodiment of the. As shown in Figure 6, the audio signal (or CD-R) CD-L output path of the alternative the power to the normal power supply of the computer system power supply 5Vaudio or the use of auxiliary power supply 5Vaux different to some extent, if the auxiliary power supply 5Vaux, CD-L the audio signal (or CD-R) signal from the power amplifier 701 output after the resistance 78, MOS FET transistor 76 via a power amplifier 702 Out-L amplifying output an audio signal (or Out-R). If the system power supply 5Vaudio, CD-L the audio signal (or CD-R) signal from the power amplifier 701 output after an audio control circuit 80, resistor 79, MOS FET transistor 77 via a power amplifier 702 Out-L amplifying output an audio signal (or Out-R), wherein, the volume control circuit 80 to the system power supply in use (5Vaudio and 3Vdigital) will be activated under a volume frequency control function, because the circuit of the computer system itself by volume control software control, therefore, in use, when the auxiliary power supply can not use this function. The MOS FET transistor 76 is connected with the gate signal VC, when the VC logic high potential of the MOS FET will only when the transistor 76 is turned on, and when the logic high potential VC only one kind of (please refer to Figure 4 of the power supply control in the state table), the MOS FET transistor 76 and the MOS FET transistor 77 is turned on at the same time will not be the case, that is, the two kind of route will not interfere with each other. Since the embodiment of the, several external the present invention can be used to integrate the switch circuit of the audio frequency of the original design compiling chip the inside of the ( Codec Audio), can be integrated in order to design the power supply selection control, can reach under the system power supply is turned off can be playing function CD ( CD Off Power). And utilize in the output of the CD-ROM drive is taken from a reference ground signal, an audio signal of the left channel and right channel audio signal with the design, can effectively inhibit the noise generated by the CD-ROM drive, can get a better audio output effect. In this it is emphasized that the change of the relevant power supply selection control also can have several kinds of changes, such as, the above-mentioned preferred embodiment an example will better one embodiment, the relevant Figure 2 in the power supply circuit 5 or Figure 3 the power supply selecting circuit 7 design, can be regarded as a power management device or power supply management unit, so that the chip circuit Codec Audio and for controlling the selection of the power supply is integrated in the same chip, the change of the implement, should be considered as in the technology of the present invention reveals the guidelines, that is, the change of this invention is similar to the implementation of what has been foreseen by the invention which can be easily derived. The invention discloses a audio control circuit comprising a power supply circuit and a control amplifying circuit, wherein the power supply circuit provides the power for the audio control circuit, audio compiling circuit for receiving the power supply from the power supply circuit and processing the audio signal, and the control amplifying circuit is used to process the output of the audio signal, wherein the power supply circuit, the control amplifying circuit and the audio compiling circuit can be integrated into one chip. The invention realizes the independent playback function of the player when the system power supply system is off. 1, an audio control circuit, characterized in that it comprises: A power management device, a power supply input to a 1st and 2nd power supply, and selected to provide a circuit power supply; and a control circuit, receiving an audio signal, and is connected with the power source of the device for managing the power supply of the circuit, and amplifying the output of the audio signal; wherein the control amplification circuit is a chip (chip). 2, an audio control circuit according to Claim 1, characterized in that in the 1st power supply has not been activated, by the 2nd power supply can be set up in order to activate the control amplifying circuit. 3, an audio control circuit according to Claim 1, characterized in that the power supply circuit includes a power supply circuit and a switch circuit, the power supply isolation circuit provides the power source and the 1st 2nd isolation of the power supply, and is composed of a plurality of Schottky diode, the switch circuit provides a power selection, by the at least one metal oxide semiconductor field effect transistor (MOS FET) form. 4, an audio control circuit according to Claim 3, characterized in that the power supply isolation circuit comprises a 1st and 2nd Schottky diode, a Schottky diode, the 1st 2nd Schottky diode connected in series with the Schottky diode, its string contact is connected to the audio coding/control circuit, the 2nd Schottky diode is connected to one end of the MOS transistor. 5, an audio control circuit according to Claim 1, characterized in that the control amplification circuit can be integrated in a audio compiler ( Codec Audio) in the circuit. 6, an audio control circuit according to Claim 1, characterized in that the audio signal output from the player, wherein the player can be a CD-ROM. 7, an audio control circuit according to Claim 1, characterized in that the control amplification circuit includes a 1st amplifying circuit, a 2nd amplifying circuit, an amplifying circuit and a 3rd 4th amplifying circuit, wherein the 1st and 2nd amplifying circuit is connected in series with the amplifying circuit, and processing the audio signal of the channel signal 1st; the 3rd and 4th amplifying circuit is connected in series with the amplifying circuit, and processing the audio signal of the channel signal 2nd. 8, an audio control circuit according to Claim 7, characterized in that the amplifying circuit of the 1st and 3rd amplifying circuit from a CD-ROM is connected with a grounding signal. 9, an audio control circuit according to Claim 7, characterized in that the 2nd output of the amplifying circuit of the horn circuit is connected to a 1st, the 4th the output of the amplifying circuit is connected to a 2nd horn circuit. 10, an audio control circuit, characterized in that it comprises: a power management device, a power supply input to a 1st and 2nd power supply, and selected to provide a circuit power supply; and a control circuit, receiving an audio signal, and is connected with the power source of the device for managing the power supply of the circuit, and amplifying the output of the audio signal; wherein the audio control circuit is a chip (chip). 11, an audio control circuit according to Claim 10, characterized in that in the 1st power supply not yet activated, can be via the 2nd power supply in order to activate the control amplification circuit. 12, an audio control circuit according to Claim 10, characterized in that the audio control circuit is a audio compiler ( Codec Audio) circuit. 13, an audio control circuit according to Claim 10, characterized in that the audio signal is output by a player, wherein the player can be a CD-ROM. 14, an audio control circuit according to Claim 10, characterized in that the control amplification circuit includes a 1st amplifying circuit, a 2nd amplifying circuit, an amplifying circuit and a 3rd 4th amplifying circuit, wherein the 1st and 2nd amplifying circuit is connected in series with the amplifying circuit, and processing the audio signal of the channel signal 1st; the 3rd and 4th amplifying circuit is connected in series with the amplifying circuit, and processing the audio signal of the channel signal 2nd. 15, an audio control circuit according to Claim 13 or 14, characterized in that the amplifying circuit of the 1st and 3rd amplifying circuit from a player are connected together to a ground signal. 16, a can input a primary power source and an auxiliary power supply of the audio frequency compiling chip, characterized in that the audio frequency compiling chip includes a power management unit, when only the auxiliary power supply input, the power management unit activates the corresponding 1st circuit, processing a pre-determined audio signal input port. 17, an audio translation chip according to Claim 16, characterized in that the input port have been pre-determined for the audio player of the audio signal of the left, right output and its grounding audio signal, wherein the player can be a CD-ROM. 18, an audio translation chip according to Claim 16, characterized in that when the main power source is input, the power management unit activates all the circuits. 19, a power management device, characterized in that it is able to be used for compiling an audio frequency ( Codec Audio) inside the chip, the power management device according to a power control signal, selectively providing power to a power supply and a 2nd 1st alternative power supply, wherein the power supply control signal corresponding to the 1st power supply. 20, a power management device according to Claim 19, characterized in that 1st power supply is a system power supply, the above-mentioned 2nd power supply is an auxiliary power supply. 21, a power management device according to Claim 19, characterized in that when the 1st power supply has not been activated, the power supply control signal will control the above-mentioned power management device is selected that provides the above-mentioned 2nd power supply.