Separation and transmission circuit for audio signals in HDMI (High Definition Multimedia Interface) signals

Abstract

The utility model provides a separation transmission circuit for audio signals in HDMI (High Definition Multimedia Interface) signals, which comprises an audio signal separation circuit, an audio signal conversion circuit and a TDM (Time Division Multiplexing) digital signal conversion circuit, the output end of the audio signal separation circuit is connected with the input end of the audio signal conversion circuit, the output end of the audio signal conversion circuit is connected with the input end of the TDM digital signal conversion circuit, and the output end of the TDM digital signal conversion circuit can be connected with intelligent electronic equipment. The beneficial effects of the utility model are that complete audio signals in HDMI signals can be separated, converted into TDM digital signals and USB signals and finally stored in intelligent electronic equipment, the loss ratio of the audio signals is low, and the user experience is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a separation and transmission circuit for audio signals in HDMI signals. Background Art

[0002] HDMI refers to High Definition Multimedia Interface (HDMI), which is a digital video / audio interface technology and a dedicated digital interface suitable for image transmission. It can transmit audio and image signals at the same time, with a maximum data transmission speed of 2.25GB / s. At the same time, there is no need for digital / analog or analog / digital conversion before signal transmission. HDMI can be used with broadband digital content protection (HDCP) to prevent unauthorized copying of copyrighted audio and video content. The extra space of HDMI can be applied to audio and video formats upgraded in the future. Because a 1080p video and an 8-channel audio signal require less than 0.5GB / s, HDMI still has a large margin, which allows it to use one cable to connect DVD players, receivers and PRRs respectively.

[0003] At present, in the process of using smart electronic devices, it is sometimes necessary to save the audio signal in the HDMI signal separately, for example, to save the audio signal in the HDMI signal separately for amplification and playback by an amplifier, or to save it for other software to edit and process the audio data. This is widely used in the live broadcast industry. The traditional method is generally to record the audio signal in the HDMI signal and then perform multiple digital-to-analog conversions to obtain the complete audio signal in the HDMI signal. However, in this way, after recording and multiple digital-to-analog conversions, the audio signal will have a higher loss ratio, and new noise will be introduced into the audio signal, resulting in more serious distortion of the complete audio signal separated from the HDMI signal, which is a very bad user experience for users. Utility Model Content

[0004] In order to solve the problems in the prior art, the utility model provides a separation and transmission circuit for audio signals in HDMI signals. By arranging an audio signal separation circuit, an audio signal conversion circuit and a TDM digital signal conversion circuit that cooperate with each other in the separation and transmission circuit for audio signals in HDMI signals, the complete audio signal in the HDMI signal can be separated and then converted into a TDM digital signal and a USB signal and finally saved in an intelligent electronic device. The audio signal loss ratio is low, which greatly improves the user experience and solves the problem in the prior art that recording the audio signal in the HDMI signal separately will result in a high audio signal loss ratio and severe distortion.

[0005] The utility model provides a separation and transmission circuit for audio signals in HDMI signals, comprising an audio signal separation circuit, an audio signal conversion circuit and a TDM digital signal conversion circuit. The input end of the audio signal separation circuit can receive the HDMI signal of an intelligent electronic device, the output end of the audio signal separation circuit is connected to the input end of the audio signal conversion circuit, the output end of the audio signal conversion circuit is connected to the input end of the TDM digital signal conversion circuit, the output end of the TDM digital signal conversion circuit can be connected to the intelligent electronic device, the audio signal separation circuit can receive the HDMI signal of the intelligent electronic device and separate the audio signal therein, and then convert it into a TDM digital signal through the audio signal conversion circuit, and then convert it into a USB signal through the TDM digital signal conversion circuit, and then output it to the intelligent electronic device for storage.

[0006] The utility model is further improved. An audio signal separation chip U12 is provided in the audio signal separation circuit. The audio signal separation chip U12 is provided with 96 pins. Pins 11, 12, 14, 15, 18, 19, 20 and 21 of the audio signal separation chip U12 can receive HDMI signals of intelligent electronic devices. Pins 57, 58, 59 and 60 of the audio signal separation chip U12 are connected to the input end of the audio signal conversion circuit.

[0007] The utility model is further improved. An audio signal conversion chip U2 is provided in the audio signal conversion circuit. The audio signal conversion chip U2 is provided with 112 pins. The J3, K6, P4 and P10 pins of the audio signal conversion chip U2 are respectively connected to the 57th, 58th, 59th and 60th pins of the audio signal separation chip U12. The N15th and R11 pins of the audio signal conversion chip U2 are connected to the input end of the TDM digital signal conversion circuit.

[0008] The utility model is further improved. A TDM digital signal conversion chip U1 is provided in the TDM digital signal conversion circuit. The TDM digital signal conversion chip U1 is provided with 65 pins. The 64th and 63rd pins of the TDM digital signal conversion chip U1 are respectively connected to the N15th and R11th pins of the audio signal conversion chip U2. The 12th and 13th pins of the TDM digital signal conversion chip U1 can be connected to an intelligent electronic device.

[0009] The utility model is further improved, and the model of the audio signal separation chip U12 is GSV2002.

[0010] The utility model is further improved, and the model of the audio signal conversion chip U2 is CM7120-WLCSP113.

[0011] The utility model is further improved, and the model of the TDM digital signal conversion chip U1 is CM6212.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: a separation and transmission circuit for audio signals in HDMI signals is provided, and by arranging an audio signal separation circuit, an audio signal conversion circuit and a TDM digital signal conversion circuit that cooperate with each other in the separation and transmission circuit for audio signals in HDMI signals, the audio signal separation circuit can receive the HDMI signal of the intelligent electronic device and separate the audio signal therein, and then convert it into a TDM digital signal through the audio signal conversion circuit, and then convert it into a USB signal through the TDM digital signal conversion circuit, and then output it to the intelligent electronic device for storage, so that the complete audio signal in the HDMI signal can be separated and then converted into a TDM digital signal and a USB signal, and finally stored in the intelligent electronic device, the audio signal loss ratio is low, and the complete audio signal separated from the HDMI signal is of high quality without obvious distortion, which greatly improves the user experience, and solves the problem in the prior art that recording the audio signal in the HDMI signal separately will result in a high audio signal loss ratio and serious distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a principle block diagram of a circuit for separating and transmitting audio signals in HDMI signals according to the utility model;

[0015] Figure 2 A circuit diagram of an audio signal separation circuit of the utility model;

[0016] Figure 3 A circuit diagram of an audio signal conversion circuit of the utility model;

[0017] Figure 4 The utility model is a circuit diagram of a TDM digital signal conversion circuit. DETAILED DESCRIPTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present utility model; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0019] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0021] like Figure 1-4As shown, the utility model provides a separation and transmission circuit for audio signals in HDMI signals, including an audio signal separation circuit, an audio signal conversion circuit and a TDM digital signal conversion circuit, the input end of the audio signal separation circuit can receive the HDMI signal of an intelligent electronic device, the output end of the audio signal separation circuit is connected to the input end of the audio signal conversion circuit, the output end of the audio signal conversion circuit is connected to the input end of the TDM digital signal conversion circuit, and the output end of the TDM digital signal conversion circuit can be connected to the intelligent electronic device. In this embodiment, the audio signal separation circuit can receive the HDMI signal of the intelligent electronic device and separate the audio signal therein, and then convert it into a TDM digital signal through the audio signal conversion circuit, and the TDM digital signal conversion circuit converts it into a USB signal and then outputs it to the intelligent electronic device for storage, which can separate the complete audio signal in the HDMI signal and then convert it into a TDM digital signal and a USB signal and finally save it in the intelligent electronic device, the audio signal loss ratio is low, the complete audio signal separated from the HDMI signal is of high quality, there will be no obvious distortion, and the user experience is greatly improved. Among them, the audio signal is a 7.1CH audio signal, which is an audio format in Audio sound effects and belongs to a high-quality audio format, so it is easy to be distorted through traditional recording methods. TDM digital signal is a time division multiplexing mode digital signal. Time division multiplexing refers to a technology that transmits multiple digital data, voice and video signals on the same communication medium through interleaved bit pulses in different channels or time slots. USB, which is the abbreviation of Universal Serial Bus, is an external bus standard used to regulate the connection and communication between computers and external devices. It is an interface technology used in the PC field. The USB interface supports the plug-and-play and hot-swap functions of devices.

[0022] like Figure 2 As shown, an audio signal separation chip U12 is provided in the audio signal separation circuit, the model of the audio signal separation chip U12 is GSV2002, and the audio signal separation chip U12 is provided with 96 pins. The 11th, 12th, 14th, 15th, 18th, 19th, 20th, and 21st pins of the audio signal separation chip U12 can receive HDMI signals of intelligent electronic devices, and the 57th, 58th, 59th, and 60th pins of the audio signal separation chip U12 are connected to the input end of the audio signal conversion circuit. In this embodiment, the audio signal separation circuit is used to separate the audio signal from the HDMI signal and send it to the audio signal conversion circuit.

[0023] like Figure 3As shown, the audio signal conversion circuit is provided with an audio signal conversion chip U2, the model of the audio signal conversion chip U2 is CM7120-WLCSP113, and the audio signal conversion chip U2 is provided with 112 pins. The J3, K6, P4, and P10 pins of the audio signal conversion chip U2 are respectively connected to the 57th, 58th, 59th, and 60th pins of the audio signal separation chip U12, and the N15th and R11 pins of the audio signal conversion chip U2 are connected to the input end of the TDM digital signal conversion circuit. In this embodiment, the audio signal conversion circuit is used to convert the audio signal into a TDM digital signal and send it to the TDM digital signal conversion circuit.

[0024] like Figure 4 As shown, a TDM digital signal conversion chip U1 is provided in the TDM digital signal conversion circuit, the model of the TDM digital signal conversion chip U1 is CM6212, and the TDM digital signal conversion chip U1 is provided with 65 pins. The 64th and 63rd pins of the TDM digital signal conversion chip U1 are respectively connected to the N15th and R11th pins of the audio signal conversion chip U2, and the 12th and 13th pins of the TDM digital signal conversion chip U1 can be connected to an intelligent electronic device. In this embodiment, the TDM digital signal conversion circuit is used to convert the TDM digital signal into a USB signal and transmit it to the intelligent electronic device for storage and use.

[0025] As can be seen from the above, the utility model provides a separation and transmission circuit for audio signals in HDMI signals. By arranging an audio signal separation circuit, an audio signal conversion circuit and a TDM digital signal conversion circuit that cooperate with each other in the separation and transmission circuit for audio signals in HDMI signals, the audio signal separation circuit can receive the HDMI signal of the intelligent electronic device and separate the audio signal therein, and then convert it into a TDM digital signal through the audio signal conversion circuit, and then convert it into a USB signal through the TDM digital signal conversion circuit and then output it to the intelligent electronic device for storage. It can separate the complete audio signal in the HDMI signal and then convert it into a TDM digital signal and a USB signal and finally save it in the intelligent electronic device. The audio signal loss ratio is low, and the complete audio signal separated from the HDMI signal is of high quality without obvious distortion, which greatly improves the user experience and solves the problem in the prior art that the audio signal in the HDMI signal is recorded separately, which leads to a high audio signal loss ratio and serious distortion.

[0026] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A separation and transmission circuit for audio signals in HDMI signals, characterized in that: It comprises an audio signal separation circuit, an audio signal conversion circuit and a TDM digital signal conversion circuit. The input end of the audio signal separation circuit can receive an HDMI signal of an intelligent electronic device, the output end of the audio signal separation circuit is connected to the input end of the audio signal conversion circuit, the output end of the audio signal conversion circuit is connected to the input end of the TDM digital signal conversion circuit, the output end of the TDM digital signal conversion circuit can be connected to an intelligent electronic device, the audio signal separation circuit can receive an HDMI signal of an intelligent electronic device and separate the audio signal therein, which is then converted into a TDM digital signal by the audio signal conversion circuit and into a USB signal by the TDM digital signal conversion circuit, and then output to the intelligent electronic device for storage.

2. The circuit for separating and transmitting audio signals in HDMI signals according to claim 1, characterized in that: An audio signal separation chip U12 is provided in the audio signal separation circuit. The audio signal separation chip U12 has 96 pins. Pins 11, 12, 14, 15, 18, 19, 20 and 21 of the audio signal separation chip U12 can receive HDMI signals of smart electronic devices. Pins 57, 58, 59 and 60 of the audio signal separation chip U12 are connected to the input end of the audio signal conversion circuit.

3. The circuit for separating and transmitting audio signals in HDMI signals according to claim 2, characterized in that: An audio signal conversion chip U2 is provided in the audio signal conversion circuit. The audio signal conversion chip U2 is provided with 112 pins. The J3, K6, P4, and P10 pins of the audio signal conversion chip U2 are respectively connected to the 57th, 58th, 59th, and 60th pins of the audio signal separation chip U12. The N15th and R11 pins of the audio signal conversion chip U2 are connected to the input end of the TDM digital signal conversion circuit.

4. The circuit for separating and transmitting audio signals in HDMI signals according to claim 3, characterized in that: The TDM digital signal conversion circuit is provided with a TDM digital signal conversion chip U1, and the TDM digital signal conversion chip U1 is provided with 65 pins. The 64th and 63rd pins of the TDM digital signal conversion chip U1 are respectively connected to the N15th and R11th pins of the audio signal conversion chip U2, and the 12th and 13th pins of the TDM digital signal conversion chip U1 can be connected to an intelligent electronic device.

5. The circuit for separating and transmitting audio signals from HDMI signals according to claim 4, characterized in that: The model of the audio signal separation chip U12 is GSV2002.

6. The circuit for separating and transmitting audio signals from HDMI signals according to claim 5, characterized in that: The model of the audio signal conversion chip U2 is CM7120-WLCSP113.

7. The circuit for separating and transmitting audio signals in HDMI signals according to claim 6, characterized in that: The model of the TDM digital signal conversion chip U1 is CM6212.

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