Method for improving privacy of conversation in vehicle

Abstract

The invention discloses a method for improving privacy of conversation in a vehicle, and relates to the field of privacy conversation in the vehicle. Comprising the following steps: (1) using a microphone at a back row seat to pick up back row human voice, and then implementing the following steps (2)-(4) at the same time; (2) a microphone, a headrest loudspeaker and a door loudspeaker at the main driving position are used for active noise control aiming at counteracting human voice in the back row; and (3) playing a masking sound source from the headrest loudspeaker and the door loudspeaker, or a distorted human voice signal generated by performing signal processing on the human voice in the back row, or a signal generated by superposing the masking sound source and the distorted human voice signal. And (4) using headrest loudspeakers and door loudspeakers of a plurality of seats in the vehicle to play the inverted sound signal and the masking sound signal in the active noise control in a bright and dark sound area. According to the invention, the discomfort of the main driver caused by the masking sound is reduced while the main driver cannot hear the voice needing to be protected clearly.

Description

Technical Field

[0001] The present invention relates to the field of private conversations in a car, and in particular to a method for improving the privacy of conversations in a car. Background Art

[0002] With the improvement of automobile NVH comfort and the enhancement of the public's awareness of personal privacy, passengers in smart cockpits have begun to have the need to protect the privacy of personal calls / conversations. With the increase in the demand for call privacy protection, people not only hope to prevent non-target users from hearing the conversation content transmitted from the speaker during the call, but also hope to prevent others from hearing the user's own words. At the same time, if two passengers are talking in the back seat, there is also a need not to let the main driver hear the content of the conversation clearly. The existing technology uses the method of playing masking sound to achieve the purpose of making non-target users unable to hear the content of the conversation, but it also causes obvious discomfort to non-target users.

[0003] Chinese patent 201910128230.9 discloses a method and system for private calls in a car, which includes three steps: A. Target user voice collection: collect the voice of the target user and locate the sound source of the target user, and process the collected sound according to the information of the sound source location to output the pure target user voice; B. Non-target user masking: focus the masking sound source according to the information of the sound source location to project it to the ears of the non-target user; C. Far-end call voice playback: focus the far-end call voice and drive the speaker array in the target user area to sound. This invention improves the privacy protection of the far-end voice content by projecting the far-end voice in the call only to the target user area. However, for the content of the target user's own speech, it only relies on sending masking sounds to non-target users to reduce the intelligibility of the sound heard by them. If you want to reduce the intelligibility of the sound to the extent that the non-target user can hardly understand the semantics, you need to play a larger masking sound, which will cause obvious discomfort to the non-target user.

[0004] In summary, the present invention provides a method for improving the privacy of in-vehicle conversations. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for improving the privacy of in-car conversations, while ensuring that the driver cannot hear the voice to be protected, reducing the discomfort caused to the driver by masking sound.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solution: a method for improving the privacy of conversation in a car, comprising the following steps:

[0007] (1) Use the microphone at the back seat to pick up the voices of the people in the back seat, and then implement the following steps (2)-(4) at the same time;

[0008] (2) Active noise control using a microphone in the driver's seat and speakers in the headrests and doors to cancel out the voices of people in the rear seats;

[0009] (3) Playing masking sound sources from the headrest speakers or door speakers, or generating distorted vocal signals by processing the rear-seat vocal signals, or a signal generated by superimposing the above two.

[0010] (4) Using the headrest speakers and door speakers of multiple seats in the vehicle, the anti-phase sound signal and masking sound signal in active noise control are played in light and dark sound zones.

[0011] The step (2) reduces the volume of the voices of people in the rear row heard by the driver, thereby making it possible to reduce the volume of the masking sound that can achieve the masking effect.

[0012] The masking sound source in step (3) is music or sounds in nature.

[0013] The step (3) is to superimpose relevant and / or irrelevant masking sound signals on the human voice signal heard by the driver at the driver's seat, thereby greatly reducing the intelligibility of the rear-seat voice at the driver's seat.

[0014] The step (4) uses the driver's seat as a bright area and the back row as a dark area. While ensuring that the driver's seat cannot hear the conversation in the back row clearly, it reduces the impact of the anti-phase sound signal and masking sound signal in the ANC on the back row passengers, providing a quieter call / conversation environment for the back row passengers.

[0015] The present invention has the following beneficial effects: the present invention reduces the volume of masking sound required to achieve a better privacy protection effect by actively controlling the human voice signal in the back row, thereby improving the comfort of the driver. At the same time, the present invention adopts light and dark partition playback, while ensuring that the driver cannot hear the back row speech clearly, reduces the impact of the reverse phase sound signal and masking sound signal in the ANC on the back row personnel, and provides a quieter call / conversation environment for the back row personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments;

[0017] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0019] Reference Figure 1 , this specific implementation adopts the following technical solution: A method for improving the privacy of in-vehicle conversations, comprising the following steps:

[0020] (1) Use the microphone at the back seat to pick up the voices of the people in the back seat, and then implement the following steps (2)-(4) simultaneously.

[0021] (2) Active noise control (ANC) is used to cancel the voices of people in the back row by using a microphone in the driver's seat and multiple speakers such as headrest speakers and door speakers. Its main function is to reduce the volume of the voices of people in the back row heard in the driver's seat, thereby making it possible to reduce the volume of the masking sound that can achieve the masking effect.

[0022] (3) Playing masking sound sources from headrest speakers, door speakers, etc. The masking sound sources are non-related sound sources such as music / sounds in nature (such as running water), or distorted human voice signals (related sound sources) generated by signal processing of the rear-seat human voices, or signals generated by superposition of the above two. Its main function is to superimpose relevant and / or irrelevant masking sound signals on the human voice signals heard by the driver at the driver's seat, thereby greatly reducing the intelligibility of the rear-seat voices at the driver's seat.

[0023] (4) Use the headrest speakers and door speakers of multiple seats in the car to play the anti-phase sound signals and masking sound signals in active noise control in light and dark sound zones. Specifically, the driver's seat is used as the light zone (the ideal goal of the light zone is to restore the original sound source without distortion), and the back row is used as the dark zone (the ideal goal of the dark zone is to have zero sound energy transmitted to the back row). Its main function is to ensure that the driver's seat cannot hear the back row's conversation clearly, while reducing the impact of the anti-phase sound signals and masking sound signals in ANC on the back row passengers, providing a quieter call / conversation environment for the back row passengers.

[0024] This specific implementation has the following advantages:

[0025] 1. Improve privacy: Through the combination of active noise control (ANC) and masking sound sources, the intelligibility of the driver's seat to the rear-seat voice can be effectively reduced, thereby improving the privacy of the rear-seat passengers' conversations.

[0026] 2. Reduce interference: Through the light and dark sound zone playback technology, the driver's seat is used as the bright area and the back row as the dark area. While ensuring that the driver's seat has difficulty hearing what is being said in the back row, it can reduce interference to the back row passengers and provide a quieter call / conversation environment.

[0027] 3. High flexibility: The masking sound source can be selected from non-related sound sources such as music, sounds in nature (such as flowing water), or distorted vocal signals (related sound sources) generated by signal processing of the back row human voices, or the signal generated by superimposing the above two. It has high flexibility and can be adjusted according to different scenarios and needs.

[0028] 4. Advanced technology: Utilizing modern acoustic technology and signal processing technology, through devices such as headrest speakers and door speakers, precise control and management of sound is achieved, reflecting a high level of technology.

[0029] 5. Good user experience: By reducing the intelligibility of the voices in the back row, the sense of privacy of the rear passengers is improved. At the same time, the light and dark sound zone playback technology is used to reduce interference to the rear passengers, thereby improving the overall user experience.

[0030] In summary, the method of this specific implementation achieves precise control of the sound environment inside the car by comprehensively utilizing modern acoustic technology and signal processing technology, effectively improving the privacy of conversations inside the car while reducing interference to rear passengers, and has high practical value and market prospects.

[0031] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for improving the privacy of in-vehicle conversations, characterized in that: The following steps are involved: (1) Use the microphone at the back seat to pick up the voices of the people in the back seat, and then implement the following steps (2)-(4) at the same time; (2) Active noise control using a microphone in the driver's seat and speakers in the headrests and doors to cancel out the voices of people in the rear seats; (3) Playing masking sound sources from headrest speakers or door speakers, or distorted vocal signals generated by signal processing of rear-seat vocals, or the signal generated by the superposition of the above two; (4) Using the headrest speakers and door speakers of multiple seats in the vehicle, the anti-phase sound signal and masking sound signal in active noise control are played in light and dark sound zones.

2. A method for improving the privacy of in-vehicle conversations according to claim 1, characterized in that: The step (2) reduces the volume of the voices of people in the rear row heard by the driver, thereby making it possible to reduce the volume of the masking sound that can achieve the masking effect.

3. The method for improving the privacy of in-vehicle conversation according to claim 1, characterized in that: The masking sound source in step (3) is music or sounds in nature.

4. The method for improving the privacy of in-vehicle conversation according to claim 1, characterized in that: The step (3) is to superimpose relevant and / or irrelevant masking sound signals on the human voice signal heard by the driver at the driver's seat, thereby greatly reducing the intelligibility of the rear-seat voice at the driver's seat.

5. The method for improving the privacy of in-vehicle conversation according to claim 1, characterized in that: The step (4) uses the driver's seat as a bright area and the back row as a dark area. While ensuring that the driver's seat cannot hear the conversation in the back row clearly, it reduces the impact of the anti-phase sound signal and masking sound signal in the ANC on the back row passengers, providing a quieter call / conversation environment for the back row passengers.

Images