CN211296940U

CN211296940U - Audio processing device

Info

Publication number: CN211296940U
Application number: CN201922276509.XU
Authority: CN
Inventors: 吴雷雷
Original assignee: iFlytek Co Ltd
Current assignee: iFlytek Co Ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-08-18
Anticipated expiration: 2029-12-17

Abstract

The utility model provides an audio processing device, include: the input interface is used for connecting an audio input device and receiving an audio signal to be processed from the audio input device; the processing circuit is connected with the input interface and used for converting the audio signal to be processed into a single-ended audio signal and processing the single-ended audio signal to output a first audio signal; the first output circuit is connected with the processing circuit, is used for being connected with the sound amplifying system and is used for transmitting the first audio signal to the sound amplifying system so as to enable the sound amplifying system to amplify the first audio signal; and the second output circuit is connected with the processing circuit, is used for connecting the transcription system and is used for transmitting the first audio signal to the transcription system so that the transcription system carries out character conversion processing on the first audio signal. Therefore, the integration of the functions of sound amplification and transcription of the intelligent conference system is realized.

Description

Audio processing device

Technical Field

The utility model relates to a conference system technical field especially relates to an audio processing device.

Background

With the advance of the construction of modern conference systems, conference records are required to be more intuitive, visualized and easy to retrieve and trace. Real-time voice transcription also gradually becomes an indispensable functional module of modern conference systems.

In the existing conference public address system in China, the output form outside the seat microphone is various, but the analog audio still occupies a large market space; for example, in a conference paperless office all-in-one machine, although a microphone rod capable of lifting is mostly arranged in a digital conference system, an analog capacitor microphone is also used, and electrets are mostly used. Most of them do not reserve a backup audio interface for each microphone; especially, in some conference sound amplification systems connected by hands in hand and daisy chain topology, the reconstruction of obtaining independent audio is particularly troublesome, and no mature similar products exist in the market.

SUMMERY OF THE UTILITY MODEL

The utility model provides an audio processing device for realize the public address of conference system and the integrated problem of transcribing.

In order to solve the above technical problem, the utility model provides a technical scheme does: there is provided an audio processing apparatus including: the input interface is used for connecting an audio input device and receiving an audio signal to be processed from the audio input device; the processing circuit is connected with the input interface and used for converting the audio signal to be processed into a single-ended audio signal and processing the single-ended audio signal to output a first audio signal; the first output circuit is connected with the processing circuit, is used for being connected with a sound amplifying system, and is used for transmitting the first audio signal to the sound amplifying system so that the sound amplifying system carries out sound amplifying processing on the first audio signal; and the second output circuit is connected with the processing circuit, is used for connecting a transcription system, and is used for transmitting the first audio signal to the transcription system so that the transcription system carries out character conversion processing on the first audio signal.

The input interface comprises a first input interface and a second input interface; the first input interface is used for connecting a microphone to receive a first audio signal to be processed; the second input interface is used for connecting the capacitor microphone to receive a second audio signal to be processed.

Wherein the processing circuit comprises: the pre-processing circuit comprises a first pre-processing circuit and a second pre-processing circuit, wherein the first pre-processing circuit is connected with the first input interface and is used for processing the first audio signal to be processed and outputting a first single-ended audio signal; the second pre-stage processing circuit is connected with the second input interface and is used for processing the second audio signal to be processed and outputting a second single-ended audio signal; and the arithmetic circuit is connected with the first preceding stage processing circuit and the second preceding stage processing circuit, and connected with the first output circuit and the second output circuit and used for adding the first single-ended audio signal and the second single-ended audio signal and outputting a first audio signal.

The first output circuit comprises a first isolation circuit and a first output interface, and the second output circuit comprises a second isolation circuit and a second output interface; the first isolation circuit is connected with the operational circuit and the first output interface, and the second isolation circuit is connected with the operational circuit and the second output interface; the first isolation circuit is used for processing the first audio signal and transmitting the first audio signal to the first output interface so that the first output interface outputs a second audio signal; the second isolation circuit is used for processing the first audio signal and transmitting the first audio signal to the second output interface so that the second output interface outputs a second audio signal; and the second audio signal output by the first output interface and the second audio signal output by the second output interface are not interfered with each other.

Wherein, still include: and the power supply is connected with the first preceding stage processing circuit and the second preceding stage processing circuit, and is used for providing direct-current voltage for the first preceding stage processing circuit and providing bias voltage for the second preceding stage processing circuit.

Wherein the first pre-stage processing circuit comprises: the phantom power supply circuit is connected with the power supply and used for receiving the direct-current voltage; the coupling circuit is connected with the phantom power supply circuit and the first input interface, and is used for receiving the first audio signal to be processed, isolating the direct-current voltage and outputting an alternating-current voltage; the differential-to-single-ended circuit is connected with the coupling circuit and the arithmetic circuit and is used for converting the first audio signal to be processed into a first single-ended audio signal according to the alternating voltage; the second pre-stage processing circuitry comprises: the bias power supply circuit is connected with the power supply and used for receiving the bias voltage; the first amplifying circuit is connected with the bias power supply circuit and the second input interface and is used for carrying out first-stage amplification processing on the second audio signal to be processed according to the bias voltage; and the second amplifying circuit is connected with the first amplifying circuit and the operational circuit and is used for carrying out second-stage amplification processing on the second audio signal to be processed after the first-stage amplification processing according to the bias voltage and outputting a second single-ended audio signal.

Wherein the phantom power supply circuit comprises: the circuit comprises a first capacitor, a first resistor, a second capacitor and a third capacitor; the first end of the first capacitor is connected with the power supply, and the second end of the first capacitor is grounded; the first end of the first resistor is connected with the first end of the first capacitor; the first end of the second resistor is connected with the first end of the first resistor; the first end of the second capacitor is connected with the second end of the second resistor; the first end of the third capacitor is connected with the second end of the second capacitor and grounded; the second end of the third capacitor is connected with the second end of the first resistor; the coupling circuit includes: a fourth capacitor and a fifth capacitor; the first end of the fourth capacitor is connected with the first end of the first input interface and the second end of the second resistor; a first end of the fifth capacitor is connected with a second end of the first input interface and a second end of the first resistor; the differential-to-single-ended circuit comprises: the third resistor, the fourth resistor, the fifth resistor, the sixth capacitor, the seventh capacitor and the first operational amplifier; the first end of the third resistor is connected with the second end of the fourth capacitor; the first end of the fourth resistor is connected with the second end of the fifth capacitor; a first input end of the first operational amplifier is connected with a second end of the third resistor, a second input end of the first operational amplifier is connected with a second end of the fourth resistor, and an output end of the first operational amplifier is connected with the operational circuit; first ends of the fifth resistor and the sixth capacitor are connected with a second input end of the first operational amplifier, and second ends of the fifth resistor and the sixth capacitor are grounded; first ends of the sixth resistor and the seventh capacitor are connected with a first input end of the first operational amplifier, and second ends of the sixth resistor and the seventh capacitor are connected with an output end of the first operational amplifier.

Wherein the bias supply circuit comprises: the first end and the second end of the seventh resistor are both connected with the power supply; the first amplification circuit includes: the eighth capacitor, the eighth resistor, the ninth resistor, the tenth resistor and the second operational amplifier; a first end of the eighth capacitor is connected with a first end of the second input interface; the first end of the eighth resistor is connected with the second end of the eighth capacitor; the first end of the ninth resistor is connected with the second end of the second input interface and grounded; a first input end of the second operational amplifier is connected with a second end of the eighth resistor, a second input end of the second operational amplifier is connected with a second end of the ninth resistor, and an output end of the second operational amplifier is connected with the second amplifying circuit; a first end of the tenth resistor is connected with a first input end of the second operational amplifier, and a second end of the tenth resistor is connected with an output end of the second operational amplifier; the second amplification circuit includes: an eleventh resistor, a twelfth resistor, a thirteenth resistor and a third operational amplifier; a first end of the eleventh resistor is connected with an output end of the second operational amplifier; a first end of the thirteenth resistor is grounded; a first input end of the third operational amplifier is connected with a second end of the eleventh resistor, a second input end of the third operational amplifier is connected with a second end of the thirteenth resistor, and an output end of the third operational amplifier is connected with the operational circuit; and a first end of the twelfth resistor is connected with a first input end of the third operational amplifier, and a second end of the twelfth resistor is connected with an output end of the third operational amplifier.

Wherein the arithmetic circuit comprises: a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a fourth operational amplifier; a first end of the fourteenth resistor is connected with an output end of the first operational amplifier; a first end of the sixteenth resistor is connected with an output end of the third operational amplifier; a first input end of the fourth operational amplifier is grounded, a second input end of the fourth operational amplifier is connected with a second end of the fourteenth resistor and a second end of the sixteenth resistor, and an output end of the fourth operational amplifier is connected with the first isolation circuit and the second isolation circuit; a first end of the fifteenth resistor is connected to the second input end of the fourth operational amplifier, and a second end of the fifteenth resistor is connected to the output end of the fourth operational amplifier.

Wherein the first isolation circuit and the second isolation circuit comprise: a seventeenth resistor, a fifth operational amplifier, an eighteenth resistor, a diode, a transformer, and a nineteenth resistor; the first end of the seventeen resistor is connected with the output end of the fourth operational amplifier; a first input end of the fifth operational amplifier is connected with a second end of the seventeenth resistor, and a second input end of the fifth operational amplifier is connected with an output end of the fifth operational amplifier; a first end of the eighteenth resistor is connected with the output end of the fifth operational amplifier; the first end of the diode is connected with the second end of the eighteenth resistor, and the second end of the diode is connected with the third end of the eighteenth resistor and grounded; the first end of the transformer is connected with the first end of the diode, and the second end of the transformer is connected with the second end of the diode; a first end of the nineteenth resistor is connected with a third end of the transformer, and a second end of the nineteenth resistor is connected with a fourth end of the transformer; the first output interface and the second output interface have first ends connected to the first end of the nineteenth resistor, and second ends connected to the second end of the nineteenth resistor.

The utility model has the advantages that: compared with the prior art, the utility model receives the audio signal to be processed from the audio input device by arranging the input interface; the processing circuit is connected with the input interface and used for converting the audio signal to be processed into a single-ended audio signal and processing the single-ended audio signal to output a first audio signal; the first output circuit is connected with the processing circuit and used for transmitting the first audio signal to the public address system so that the public address system can conduct public address processing on the first audio signal; and the second output circuit is connected with the processing circuit, is used for connecting the transcription system and is used for transmitting the first audio signal to the transcription system so that the transcription system carries out character conversion processing on the first audio signal. And then realize the integration of public address and transcription of intelligent conference system.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of an audio processing apparatus according to the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of the audio processing apparatus of the present invention;

fig. 3 is a schematic structural diagram of a third embodiment of the audio processing apparatus of the present invention;

fig. 4 is a schematic structural diagram of a first pre-stage processing circuit in the audio processing apparatus of the present invention;

fig. 5 is a schematic structural diagram of a second preceding stage processing circuit in the audio processing apparatus of the present invention;

fig. 6 is a schematic structural diagram of a fourth embodiment of the audio processing circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the existing conference system transcription product, voice data of each seat needs to be acquired, and role characteristic information is respectively extracted from voice signals to realize role separation and role switching, or further voice comparison characteristics are extracted according to product design to realize role separation; and extracting the seat voice which needs to be transcribed currently from the multi-path voice data, sending the seat voice to a transcription system for character transcription, and finally realizing real-time effective recording of the conference in the modes of character separation, character transcription, audio backup and the like.

The common conference room with the sound reinforcement system has the advantages that the intelligent conference transcription function is subjected to several choices, and audio equipment of the sound reinforcement system with a specific model can be directly selected according to the recommendation of an intelligent conference transcription system manufacturer; thus, the loss of direct or partial scrapping of the original sound amplifying system can be brought; most conference hosts can acquire information such as ID (identity) and key switches of seats through serial ports and also can acquire audio signals finally used for sound amplification, but practical difficulties exist, for example, role information depends on keys, and audio depends on an algorithm of the conference hosts, so that the limitation that only one path of audio transcription can be allowed at each time can be caused, and bad experience is brought to deployment, experience and product application of a conference system.

The utility model provides an audio processing device to the realization carries out the purpose that role separation, characters reprint, backup audio frequency with input audio frequency, and then realizes conference system's public address and the integration of reprinting. The present invention will be described in detail with reference to the accompanying drawings and examples.

Please refer to fig. 1, which is a diagram illustrating a result of a first embodiment of the audio processing apparatus according to the present invention. The method comprises the following steps: input interface 1, processing circuit 2, first output circuit 3 and second output circuit 4. The processing circuit 2 is connected to the input interface 1, and the first output circuit 3 and the second output circuit 4 are connected to the processing circuit 2.

Specifically, the input interface 1 is used to connect an audio input device and receive an audio signal to be processed from the audio input device. In one embodiment, the audio input device is a microphone, a capacitor microphone, or the like capable of receiving audio. The processing circuit 2 receives the audio signal to be processed from the input interface 1, converts the audio signal to be processed into a single-ended audio signal, and processes the single-ended audio signal to output a first audio signal. The first output circuit 3 is connected to an external sound amplifying system, and is configured to receive the first audio signal from the processing circuit 2 and transmit the first audio signal to the sound amplifying system, so that the sound amplifying system performs sound amplifying processing on the first audio signal. Specifically, the public address process is to amplify an input audio signal to be diffused into a wide-range space in a conference room application scene. The second output circuit 4 is connected to the external transcription system, and is configured to receive the first audio signal from the processing circuit 2 and transmit the first audio signal to the transcription system, so that the transcription system performs word conversion processing on the first audio signal. Specifically, the text-to-text processing includes converting an input audio signal into a text form and outputting it.

The utility model provides an audio processing device includes an input interface and two output circuit, and one of them output circuit connects public address system for carry out public address processing to the audio frequency, another output circuit connection transcription system, be used for truning into the audio frequency into characters and record. Therefore, the multi-channel output of the conference system is realized, and the integration of sound amplification and transcription of the intelligent conference system is realized.

To further explain the structure of the audio processing device of the present invention, please refer to fig. 2, which is a schematic structural diagram of a second embodiment of the audio processing device of the present invention. The input interface 1 includes a first input interface 11 and a second input interface 12. The processing circuit 2 includes a pre-stage processing circuit 21 and an arithmetic circuit 22. The pre-processing circuit 21 includes a first pre-processing circuit 211 and a second pre-processing circuit 212. The first output circuit 3 includes a first isolation circuit 31 and a first output interface 32. The second output circuit 4 includes a second isolation circuit 41 and a second output circuit 42.

The first input interface 11 is configured to be connected to a microphone to receive a first audio signal to be processed from the microphone, and the second input interface 12 is configured to be connected to a condenser microphone to receive a second audio signal to be processed from the condenser microphone. The first pre-processing circuit 211 is connected to the first input interface 11 and configured to process the first to-be-processed audio signal input from the first input interface 11 and output a first single-ended audio signal, and the second pre-processing circuit 212 is connected to the second input interface 12 and configured to process the second to-be-processed audio signal input from the second input interface 12 and output a second single-ended audio signal. The arithmetic circuit 22 is connected to the first pre-processing circuit 211 and the second pre-processing circuit 212, and is configured to receive the first single-ended audio signal and the second single-ended audio signal from the first pre-processing circuit 211 and the second pre-processing circuit 212 and add them together to output the first audio signal. The operation circuit 22 is further connected to the first isolation circuit 31 and the second isolation circuit 41, the first isolation circuit 31 and the second isolation circuit 41 receive the first audio signal from the operation circuit 22, isolate the first audio signal to obtain a second audio signal, and transmit the second audio signal to the first output interface 32 and the second output interface 42, so that the first output interface 32 and the second output interface 42 output the second audio signal. It will be appreciated that the first output interface 32 is connected to the first isolation circuit 31 and the second output interface 42 is connected to the second isolation circuit 41.

Specifically, in the present embodiment, after the first audio signal is processed by the first isolation circuit 31 and the second isolation circuit 41, the first output interface 32 and the second output interface 42 output the second audio signal, because the first isolation circuit 31 and the second isolation circuit 41 perform isolation processing on the first audio signal, the second audio signals output by the first output interface 32 and the second output interface 42 are independent from each other and do not interfere with each other.

Fig. 3 is a schematic structural diagram of a third embodiment of the audio processing device according to the present invention. Compared with the second embodiment shown in fig. 2, the difference is that the audio processing apparatus shown in the present embodiment further includes a power supply 5. The power supply 5 is connected to the first pre-processing circuit 211 and the second pre-processing circuit 212. Specifically, the power supply 5 supplies a dc voltage to the first pre-processing circuit 211, and the power supply 5 supplies a bias voltage to the second pre-processing circuit 212.

Specifically, the power supply 5 supplies dc voltage to the first pre-stage processing circuit 211 in a phantom power supply manner, which has the outstanding advantages of wide frequency band, flat response curve, high output, small nonlinear distortion, good transient response, and the like. And since the first input interface 11 is typically connected to a microphone, the input of the microphone supports standard phantom power. Whereas the input of the condenser microphone supports an adjustable bias voltage, since the second input interface 12 is typically connected to a condenser microphone.

Fig. 4 is a schematic structural diagram of a first pre-stage processing circuit of the audio processing apparatus according to the present invention. That is, the first pre-processing circuit 211 includes a phantom supply circuit 2111, a coupling circuit 2112 and a differential-to-single-ended circuit 2113. The phantom power supply circuit 2111 is connected to the power supply 5 and configured to receive a dc voltage from the power supply 5, the coupling circuit 2112 is connected to the phantom power supply circuit 2111 and the first input interface 11 and configured to receive a first audio signal to be processed from the first input interface 11 and receive a dc voltage from the phantom power supply circuit 2111, and the coupling circuit 2112 isolates the received dc voltage to output an ac voltage. The differential-to-single-ended circuit 2113 is connected to the coupling circuit 2112 and the arithmetic circuit 22, and is configured to convert the first to-be-processed audio signal into a first single-ended audio signal according to the ac voltage output by the coupling circuit 2112 and transmit the first single-ended audio signal to the arithmetic circuit 22.

Fig. 5 is a schematic structural diagram of a second pre-stage processing circuit of the audio processing apparatus according to the present invention. That is, the second pre-processing circuit 212 includes a bias power supply circuit 2121, a first amplifier circuit 2122, and a second amplifier circuit 2123. The bias power supply circuit 2121 is connected to the power supply 5 and configured to receive a bias voltage from the power supply 5, the first amplifying circuit 2122 is connected to the bias power supply circuit 2121 and the second input interface 12 and configured to receive a second audio signal to be processed from the second input interface 12 and receive the bias voltage from the bias power supply circuit 2121, the first amplifying circuit 2122 is configured to perform a first-stage amplification process on the second audio signal to be processed according to the bias voltage, and the second amplifying circuit 2123 is configured to perform a second-stage amplification process on the second audio signal to be processed that is subjected to the first-stage amplification process according to the bias voltage and output a second single-ended audio signal to the operation circuit 22.

Fig. 6 is a schematic structural diagram of a fourth embodiment of an audio processing device according to the present invention. The first input interface 11 is a cannon interface, and may also be other interfaces as long as a microphone can be connected to receive the first audio signal to be processed from the microphone, and the first audio signal to be processed is not limited herein. Specifically, if the first input interface 11 is a cannon interface, the first end and the second end thereof are connected to the first pre-processing circuit, and the third end and the fourth end thereof are grounded. Specifically, the first pre-processing circuit 211 includes a phantom supply circuit 2111, a coupling circuit 2112, and a differential-to-single-ended circuit 2113.

The phantom power supply circuit 2111 includes a first capacitor C1, a first resistor R1, a second resistor R2, a second capacitor C2, and a third capacitor C3. The first capacitor C1 includes a first terminal and a second terminal, the first terminal of the first capacitor C1 is connected to the power supply 5, receives the dc voltage V1 from the power supply 5, and the second terminal is grounded. The first resistor R1 includes a first terminal and a second terminal, the first terminal of the first resistor R1 is connected to the first terminal of the first capacitor C1, and the second terminal is connected to the third capacitor C3. The second resistor R2 includes a first terminal and a second terminal, the first terminal of the second resistor R2 is connected to the first terminal of the first resistor R1, and the second terminal is connected to the second capacitor C2. The second capacitor C2 includes a first terminal and a second terminal, the first terminal of the second capacitor C2 is connected to the second terminal of the second resistor R2, and the second terminal is connected to the third capacitor C3. The third capacitor C3 includes a first terminal and a second terminal, the first terminal of the third capacitor C3 is connected to the second terminal of the second capacitor C2 and to ground, and the second terminal of the third capacitor C3 is connected to the second terminal of the first resistor R1.

The coupling circuit 2112 includes a fourth capacitor C4 and a fifth capacitor C5. The fourth capacitor C4 includes a first terminal and a second terminal, and the first terminal of the fourth capacitor C4 is connected to the first terminal of the first input interface 11 and the second terminal of the second resistor R2. The fifth capacitor C5 includes a first terminal and a second terminal, and the first terminal of the fifth capacitor C5 is connected to the second terminal of the first input interface 11 and the second terminal of the first resistor R1.

The differential-to-single-ended circuit 2113 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a sixth capacitor C6, a seventh capacitor C7 and a first operational amplifier U1. The third resistor R3 includes a first end and a second end, the first end of the third resistor R3 is connected to the second end of the fourth capacitor C4, the fourth resistor R4 includes a first end and a second end, and the first end of the fourth resistor R4 is connected to the second end of the fifth capacitor C5. The first operational amplifier U1 includes a first input terminal, a second input terminal, and an output terminal, the first input terminal of the first operational amplifier U1 is connected to the second terminal of the third resistor R3, the second input terminal of the first operational amplifier U1 is connected to the second terminal of the fourth resistor R4, and the output terminal of the first operational amplifier U1 is connected to the operational circuit 22. First ends of a fifth resistor R5 and a sixth capacitor C6 are connected with a second input end of the first operational amplifier U1, and second ends of the fifth resistor R5 and the sixth capacitor C6 are grounded; first ends of a sixth resistor R6 and a seventh capacitor C7 are connected to a first input end of the first operational amplifier U1, and second ends of the sixth resistor R6 and the seventh capacitor C7 are connected to an output end of the first operational amplifier U1.

The second pre-processing circuit 212 includes a bias supply circuit 2121, a first amplifier circuit 2122, and a second amplifier circuit 2123. The bias power supply circuit 2121 includes: a seventh resistor R7. The seventh resistor R7 includes a first end and a second end, and the first end and the second end of the seventh resistor R7 are both connected to the power supply 5 to receive the bias voltage V2 from the power supply 5; specifically, the seventh resistor R7 is an adjustable resistor, which can be adjusted according to the required magnitude of the bias voltage V2.

The first amplification circuit 2122 includes: an eighth capacitor C8, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a second operational amplifier U2. The eighth capacitor C8 includes a first end and a second end, and the first end of the eighth capacitor R8 is connected to the first end of the second input interface 12; the eighth resistor R8 includes a first end and a second end, and the first end of the eighth resistor R8 is connected to the second end of the eighth capacitor C8; the ninth resistor R9 includes a first end and a second end, the first end of the ninth resistor R9 is connected to the second end of the second input interface 12 and grounded; the second operational amplifier U2 includes a first input terminal, a second input terminal and an output terminal, the first input terminal of the second operational amplifier U2 is connected to the second terminal of the eighth resistor R8, the second input terminal of the second operational amplifier U2 is connected to the second terminal of the ninth resistor R9, and the output terminal of the second operational amplifier U2 is connected to the second amplifying circuit; the tenth resistor R10 includes a first end and a second end, the first end of the tenth resistor R10 is connected to the first input terminal of the second operational amplifier U2, and the second end of the tenth resistor R10 is connected to the output terminal of the second operational amplifier U2.

The second amplification circuit 2123 includes: an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a third op-amp U3. The eleventh resistor R11 includes a first end and a second end, and the first end of the eleventh resistor R11 is connected to the output end of the second operational amplifier U2. The thirteenth resistor R13 comprises a first end and a second end, and the first end of the thirteenth resistor R13 is grounded; the third operational amplifier U3 includes a first input terminal, a second input terminal and an output terminal, the first input terminal of the third operational amplifier U3 is connected to the second terminal of the eleventh resistor R11, the second input terminal of the third operational amplifier U3 is connected to the second terminal of the thirteenth resistor R13, and the output terminal of the third operational amplifier U3 is connected to the arithmetic circuit 22; the twelfth resistor R12 includes a first end and a second end, the first end of the twelfth resistor R12 is connected to the first input terminal of the third operational amplifier U3, and the second end of the twelfth resistor R12 is connected to the output terminal of the third operational amplifier U3.

The arithmetic circuit 22 includes: a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16 and a fourth op-amp U4. The fourteenth resistor R14 includes a first end and a second end, and the first end of the fourteenth resistor R14 is connected to the output end of the first operational amplifier U1; the sixteenth resistor R16 comprises a first end and a second end, and the first end of the sixteenth resistor R16 is connected with the output end of the third operational amplifier U3; the fourth operational amplifier U4 includes a first input terminal, a second input terminal, and an output terminal, the first input terminal of the fourth operational amplifier U4 is grounded, the second input terminal of the fourth operational amplifier U4 is connected to the second terminal of the fourteenth resistor R14 and the second terminal of the sixteenth resistor R16, and the output terminal of the fourth operational amplifier U4 is connected to the first isolation circuit 34 and the second isolation circuit 41; the fifteenth resistor R15 includes a first end and a second end, the first end of the fifteenth resistor R15 is connected to the second input terminal of the fourth operational amplifier U4, and the second end of the fifteenth resistor R15 is connected to the output terminal of the fourth operational amplifier U4.

The first isolation circuit 31 is the same as the second isolation circuit 41, that is, the first isolation circuit 31 and the second isolation circuit 41 include: a seventeenth resistor R17, a fifth operational amplifier U5, an eighteenth resistor R18, a diode D, a transformer L, and a nineteenth resistor R19. The seventeenth resistor R17 comprises a first end and a second end, and the first end of the seventeenth resistor R17 is connected with the output end of the fourth operational amplifier U4; the fifth operational amplifier U5 includes a first input terminal, a second input terminal, and an output terminal, the first input terminal of the fifth operational amplifier U5 is connected to the second terminal of the seventeenth resistor R17, and the second input terminal of the fifth operational amplifier U5 is connected to the output terminal of the fifth operational amplifier U5. The eighteenth resistor R18 includes a first end and a second end, and the first end of the eighteenth resistor R18 is connected to the output terminal of the fifth op amp U5. The diode D comprises a first end and a second end, the first end of the diode D is connected with the second end of the eighteenth resistor R18, and the second end of the diode D is connected with the third end of the eighteenth resistor R18 and is grounded; the transformer L comprises a first end, a second end, a third end and a fourth end, the first end of the transformer L is connected with the first end of the diode D, and the second end of the transformer L is connected with the second end of the diode D. The nineteenth resistor R19 includes a first terminal and a second terminal, the first terminal of the nineteenth resistor R19 is connected to the third terminal of the transformer L, and the second terminal of the nineteenth resistor R19 is connected to the fourth terminal of the transformer L.

The first output interface 32 and the second output interface 42 are cannon interfaces, first ends of the first output interface 32 and the second output interface 42 are connected with a first end of a nineteenth resistor R19, and second ends of the first output interface 32 and the second output interface 42 are connected with a second end of a nineteenth resistor R19.

Specifically, the first output interface 32 is used for connecting a public address system, so that the public address system performs public address processing on the second audio signal output by the first output interface 32; the second output interface 42 is used for connecting the transcription system, so that the transcription system performs the text-to-word processing on the second audio signal output by the second output interface 42.

The utility model provides an audio processing circuit, its power supply 5 provide the illusion power supply to the microphone that first input interface 11 is connected according to the concrete power supply mode, provide DC voltage V1 promptly, provide bias voltage V2 to the condenser microphone that second input interface 12 is connected, and bias voltage V2 can be adjusted according to the type of the condenser microphone who connects. The power supply 5 can also provide the required power for the processing circuit 2, the first output circuit 3 and the second output circuit 4.

The first pre-processing circuit 211 is connected to the first input interface 11, and is configured to receive the first audio signal from the microphone and process the first audio signal to output a first single-ended audio signal Vo 1. Specifically, since the microphone input is generally a balanced input, the values of the fourth capacitor C4 and the fifth capacitor C5 in the coupling circuit 2112 connected to the first input interface 11 are the same, that is, C4 is equal to C5, and the coupling circuit 2112 performs ac coupling to isolate a dc signal. In a specific embodiment, a resistance of the third resistor R3 in the differential-to-single-ended circuit 2113 is equal to a resistance of the fourth resistor R4, that is, R3 is equal to R4; the resistance of a sixth resistor R6 in the differential-to-single-ended circuit is equal to the resistance of a fifth resistor R5, that is, R6 is equal to R5; the sixth capacitor C6 in the differential-to-single-ended circuit 2112 is equal to the seventh capacitor C7, i.e., C6 is equal to C7.

The second pre-processing circuit 212 is connected to the second input interface 12, and is configured to receive the second audio signal from the condenser microphone and process the second audio signal to output the second single-ended audio signal Vo2, specifically, the second pre-processing circuit 212 needs to perform amplification processing on the audio signal to be processed twice, that is, the second pre-processing circuit 212 further includes a first amplifying circuit 2122 and a second amplifying circuit 2123 in addition to the bias power supply circuit 2121. The tenth resistor R10 and the eighth resistor R8 of the first amplifying circuit 2122 are used for controlling the amplification factor of the first amplifying circuit 2122, the twelfth resistor R12 and the eleventh resistor R11 of the second amplifying circuit 2123 are used for controlling the amplification factor of the second amplifying circuit 2123, and the ninth resistor R9 of the first amplifying circuit 2122 and the thirteenth resistor R13 of the second amplifying circuit 2123 are used for adjusting the circuit balance.

The operational circuit 22 is configured to add the first single-ended audio signal Vo1 and the second single-ended audio signal Vo2 and output the first audio signal to the first isolation circuit 31 and the second isolation circuit 41, and the first isolation circuit 31 processes the first audio signal and outputs the processed first audio signal to the first output interface 32, so that the first output interface 32 outputs a second audio signal OUT 1; the second isolation circuit 41 processes the first audio signal and outputs the processed first audio signal to the second output interface 42, so that the second output interface 42 outputs a second audio signal OUT 2. Specifically, the second audio signal OUT1 is the same as the second audio signal OUT2, and after being processed by the first isolation circuit 31 and the second isolation circuit 41, OUT1 and OUT2 are not interfered with each other and are independent of each other. Specifically, the specific values of the second audio signal OUT1 and the second audio signal OUT2 depend on the sizes of the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 in the operational circuit 22, i.e., the values of the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are determined by the values of the first audio signal OUT1 and the second audio signal OUT2

In practical application, only one path of input can be selected from the microphone input and the condenser microphone input under a certain condition, and the other path is 0. Specifically, if only microphone input is currently available, then

If only the input of the condenser microphone is present, then

In the embodiment, the isolation circuit has a large input impedance and a small output impedance, so that the second audio signal OUT1 and the second audio signal OUT2 output by the first output interface 32 and the second output interface 42 are isolated from each other and do not interfere with each other. Wherein the first output interface 32 is connected to a public address system so that the output second audio signal OUT1 is used for public address, and the second output interface 42 is connected to a transcription system so that the output second audio signal OUT2 is used for voice transcription. Therefore, the integration of sound amplification and transcription in the intelligent conference system is realized.

In the present invention, the audio processing apparatus only describes some related functional structures, and other functional structures are the same as the functional structures of the audio processing apparatus in the prior art and are not repeated herein.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An audio processing apparatus, comprising:

the input interface is used for connecting an audio input device and receiving an audio signal to be processed from the audio input device;

the processing circuit is connected with the input interface and used for converting the audio signal to be processed into a single-ended audio signal and processing the single-ended audio signal to output a first audio signal;

the first output circuit is connected with the processing circuit, is used for being connected with a sound amplifying system, and is used for transmitting the first audio signal to the sound amplifying system so that the sound amplifying system carries out sound amplifying processing on the first audio signal;

and the second output circuit is connected with the processing circuit, is used for connecting a transcription system, and is used for transmitting the first audio signal to the transcription system so that the transcription system carries out character conversion processing on the first audio signal.

2. The audio processing device of claim 1, wherein the input interface comprises a first input interface and a second input interface;

the first input interface is used for connecting a microphone to receive a first audio signal to be processed; the second input interface is used for connecting the capacitor microphone to receive a second audio signal to be processed.

3. The audio processing apparatus according to claim 2, wherein the processing circuit comprises:

the pre-processing circuit comprises a first pre-processing circuit and a second pre-processing circuit, wherein the first pre-processing circuit is connected with the first input interface and is used for processing the first audio signal to be processed and outputting a first single-ended audio signal; the second pre-stage processing circuit is connected with the second input interface and is used for processing the second audio signal to be processed and outputting a second single-ended audio signal;

and the arithmetic circuit is connected with the first preceding stage processing circuit and the second preceding stage processing circuit, and connected with the first output circuit and the second output circuit and used for adding the first single-ended audio signal and the second single-ended audio signal and outputting a first audio signal.

4. The audio processing device of claim 3, wherein the first output circuit comprises a first isolation circuit and a first output interface, and the second output circuit comprises a second isolation circuit and a second output interface;

the first isolation circuit is connected with the operational circuit and the first output interface, and the second isolation circuit is connected with the operational circuit and the second output interface;

the first isolation circuit is used for processing the first audio signal and transmitting the first audio signal to the first output interface so that the first output interface outputs a second audio signal;

the second isolation circuit is used for processing the first audio signal and transmitting the first audio signal to the second output interface so that the second output interface outputs a second audio signal;

and the second audio signal output by the first output interface and the second audio signal output by the second output interface are not interfered with each other.

5. The audio processing apparatus according to claim 3, further comprising: and the power supply is connected with the first preceding stage processing circuit and the second preceding stage processing circuit, and is used for providing direct-current voltage for the first preceding stage processing circuit and providing bias voltage for the second preceding stage processing circuit.

6. The audio processing apparatus according to claim 5, wherein the first pre-stage processing circuit comprises:

the phantom power supply circuit is connected with the power supply and used for receiving the direct-current voltage;

the coupling circuit is connected with the phantom power supply circuit and the first input interface, and is used for receiving the first audio signal to be processed, isolating the direct-current voltage and outputting an alternating-current voltage;

the differential-to-single-ended circuit is connected with the coupling circuit and the arithmetic circuit and is used for converting the first audio signal to be processed into a first single-ended audio signal according to the alternating voltage;

the second pre-stage processing circuitry comprises:

the bias power supply circuit is connected with the power supply and used for receiving the bias voltage;

the first amplifying circuit is connected with the bias power supply circuit and the second input interface and is used for carrying out first-stage amplification processing on the second audio signal to be processed according to the bias voltage;

and the second amplifying circuit is connected with the first amplifying circuit and the operational circuit and is used for carrying out second-stage amplification processing on the second audio signal to be processed after the first-stage amplification processing according to the bias voltage and outputting a second single-ended audio signal.

7. The audio processing apparatus according to claim 6, wherein the phantom power circuit comprises: the circuit comprises a first capacitor, a first resistor, a second capacitor and a third capacitor;

the first end of the first capacitor is connected with the power supply, and the second end of the first capacitor is grounded; the first end of the first resistor is connected with the first end of the first capacitor; the first end of the second resistor is connected with the first end of the first resistor; the first end of the second capacitor is connected with the second end of the second resistor; the first end of the third capacitor is connected with the second end of the second capacitor and grounded; the second end of the third capacitor is connected with the second end of the first resistor;

the coupling circuit includes: a fourth capacitor and a fifth capacitor;

the first end of the fourth capacitor is connected with the first end of the first input interface and the second end of the second resistor; a first end of the fifth capacitor is connected with a second end of the first input interface and a second end of the first resistor;

the differential-to-single-ended circuit comprises: the third resistor, the fourth resistor, the fifth resistor, the sixth capacitor, the seventh capacitor and the first operational amplifier;

the first end of the third resistor is connected with the second end of the fourth capacitor; the first end of the fourth resistor is connected with the second end of the fifth capacitor; a first input end of the first operational amplifier is connected with a second end of the third resistor, a second input end of the first operational amplifier is connected with a second end of the fourth resistor, and an output end of the first operational amplifier is connected with the operational circuit; first ends of the fifth resistor and the sixth capacitor are connected with a second input end of the first operational amplifier, and second ends of the fifth resistor and the sixth capacitor are grounded; first ends of the sixth resistor and the seventh capacitor are connected with a first input end of the first operational amplifier, and second ends of the sixth resistor and the seventh capacitor are connected with an output end of the first operational amplifier.

8. The audio processing device of claim 6, wherein the bias supply circuit comprises: the first end and the second end of the seventh resistor are both connected with the power supply;

the first amplification circuit includes: the eighth capacitor, the eighth resistor, the ninth resistor, the tenth resistor and the second operational amplifier; a first end of the eighth capacitor is connected with a first end of the second input interface; the first end of the eighth resistor is connected with the second end of the eighth capacitor; the first end of the ninth resistor is connected with the second end of the second input interface and grounded; a first input end of the second operational amplifier is connected with a second end of the eighth resistor, a second input end of the second operational amplifier is connected with a second end of the ninth resistor, and an output end of the second operational amplifier is connected with the second amplifying circuit; a first end of the tenth resistor is connected with a first input end of the second operational amplifier, and a second end of the tenth resistor is connected with an output end of the second operational amplifier;

the second amplification circuit includes: an eleventh resistor, a twelfth resistor, a thirteenth resistor and a third operational amplifier; a first end of the eleventh resistor is connected with an output end of the second operational amplifier; a first end of the thirteenth resistor is grounded; a first input end of the third operational amplifier is connected with a second end of the eleventh resistor, a second input end of the third operational amplifier is connected with a second end of the thirteenth resistor, and an output end of the third operational amplifier is connected with the operational circuit; and a first end of the twelfth resistor is connected with a first input end of the third operational amplifier, and a second end of the twelfth resistor is connected with an output end of the third operational amplifier.

9. The audio processing apparatus according to claim 7 or 8, wherein the arithmetic circuit comprises: a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a fourth operational amplifier; a first end of the fourteenth resistor is connected with an output end of the first operational amplifier; a first end of the sixteenth resistor is connected with an output end of the third operational amplifier; a first input end of the fourth operational amplifier is grounded, a second input end of the fourth operational amplifier is connected with a second end of the fourteenth resistor and a second end of the sixteenth resistor, and an output end of the fourth operational amplifier is connected with the first isolation circuit and the second isolation circuit; a first end of the fifteenth resistor is connected to the second input end of the fourth operational amplifier, and a second end of the fifteenth resistor is connected to the output end of the fourth operational amplifier.

10. The audio processing device of claim 9, wherein the first isolation circuit and the second isolation circuit comprise: a seventeenth resistor, a fifth operational amplifier, an eighteenth resistor, a diode, a transformer, and a nineteenth resistor; the first end of the seventeen resistor is connected with the output end of the fourth operational amplifier; a first input end of the fifth operational amplifier is connected with a second end of the seventeenth resistor, and a second input end of the fifth operational amplifier is connected with an output end of the fifth operational amplifier; a first end of the eighteenth resistor is connected with the output end of the fifth operational amplifier; the first end of the diode is connected with the second end of the eighteenth resistor, and the second end of the diode is connected with the third end of the eighteenth resistor and grounded; the first end of the transformer is connected with the first end of the diode, and the second end of the transformer is connected with the second end of the diode; a first end of the nineteenth resistor is connected with a third end of the transformer, and a second end of the nineteenth resistor is connected with a fourth end of the transformer;

the first output interface and the second output interface have first ends connected to the first end of the nineteenth resistor, and second ends connected to the second end of the nineteenth resistor.