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CN-224233732-U - Noise reducer for telephone call of relatives in prisons

CN224233732UCN 224233732 UCN224233732 UCN 224233732UCN-224233732-U

Abstract

The utility model discloses a noise reducer for a prison family telephone call, which comprises an earphone connected with a fixed telephone host and a noise reduction assembly arranged on the earphone, wherein the noise reduction assembly comprises a cover body, a flexible circuit board, a microphone array, a sound absorption material layer and a noise reduction loudspeaker, wherein the cover body is covered on the earphone, the flexible circuit board is arranged on the inner wall of the cover body and comprises a power interface and a noise reduction control circuit, the microphone array is arranged on the cover body at a position opposite to the front end and the rear end of the earphone, the sound absorption material layer is arranged on the inner wall of the cover body at a position opposite to the front end of the earphone, a sound insulation cavity is arranged on the sound absorption material layer close to the earphone, and the noise reduction loudspeaker is arranged in the sound insulation cavity. In the utility model, firstly, the feedforward and feedback microphones are combined to improve the recognition accuracy and response speed of noise in different directions and frequencies, and secondly, the noise reduction loudspeaker is arranged in the sound insulation cavity to avoid direct contact with the earphone loudspeaker and reduce the problem of sound interference or resonance.

Inventors

  • DAI ZHIPENG
  • JIN XIAODONG
  • ZHANG FURUI
  • SHI ZHENG
  • ZHANG ZIQUAN

Assignees

  • 杭州华亭科技有限公司

Dates

Publication Date
20260512
Application Date
20250619

Claims (7)

  1. 1. Prison family telephone conversation noise reducer, including earphone (1) that is connected with fixed telephone host computer to and lay on earphone (1) and fall noise subassembly (3), its characterized in that, fall noise subassembly (3) include: A cover body (31) which is covered on the earphone (1); The flexible circuit board (34) is arranged on the inner wall of the cover body (31), and the flexible circuit board (34) comprises a power interface and a noise reduction control circuit; The microphone array is arranged on the cover body (31) at a position opposite to the front end and the rear end of the receiver (1), and is electrically connected with the input end of the noise reduction control circuit; The sound-absorbing material layer (35) is arranged on the inner wall of the cover body (31) at a position opposite to the front end of the receiver (1), a sound-insulating cavity (3501) and a plurality of sound-emitting holes (3502) communicated with the sound-insulating cavity (3501) are arranged on the sound-absorbing material layer (35) at a position close to the receiver (1); the noise reduction loudspeaker (36) is arranged in the sound insulation cavity (3501), and the noise reduction loudspeaker (36) is connected with the output end of the noise reduction control circuit; and the two-in-one patch cord (2) is electrically connected between the earphone (1) and the flexible circuit board (34) and the fixed telephone host.
  2. 2. The prison affinity phone call noise reducer of claim 1, wherein the microphone array comprises: a feedforward microphone (32) which is arranged at the outer side of the cover body (31) and at the position opposite to the rear end of the receiver (1); A feedback microphone (33) installed at a position opposite to the front end of the receiver (1) inside the cover body (31); The feedforward microphone (32) and the feedback microphone (33) are electrically connected with the input end of the noise reduction control circuit through FPC flexible flat cables.
  3. 3. The prison affinity phone call noise reducer of claim 2, wherein the feed-forward microphones (32) are provided in two numbers.
  4. 4. The prison affinity phone call noise reducer according to claim 1, wherein the sound absorbing material layer (35) is made of one of EVA foam, sponge or porous sound absorbing material.
  5. 5. The prison affinity phone call noise reducer according to claim 1, wherein the one-to-two patch cord (2) comprises: the first RJ12 terminal is electrically connected with the receiver interface of the fixed telephone host; A second RJ12 terminal electrically connected with the earphone (1); and the power connection terminal is electrically connected with a power interface of the flexible circuit board (34).
  6. 6. The prison affinity phone call noise reducer according to claim 1, wherein the cover body (31) is a hollow cup-shaped structure which is made of silica gel or TPU soft material and imitates the shape of the receiver (1).
  7. 7. The prison affinity phone call noise reducer according to claim 6, wherein the cover (31) is open at the bottom and closed at the top, and the inner wall of the cover (31) is provided with a clamping groove for accommodating a flexible circuit board (34).

Description

Noise reducer for telephone call of relatives in prisons Technical Field The utility model relates to the technical field of fixed telephones, in particular to a noise reducer for telephone conversation in a prison family. Background The application of noise reduction technology is particularly important in the field of landline telephone technology, particularly in environments where high privacy and security are required, such as in prison-line telephone conversations. At present, the prior Chinese patent publication No. CN210053456U discloses a noise reduction accessory with an active noise reduction function, which comprises a cover body, a circuit board, a microphone and a noise reduction loudspeaker, wherein the cover body is used for being sleeved on the outer side of a receiver, the circuit board comprises a power interface and a noise reduction control circuit which are electrically connected, the microphone is fixedly arranged on the outer side of the cover body and is electrically connected with the input end of the noise reduction control circuit and used for receiving noise in the environment, and the noise reduction loudspeaker is fixedly arranged on one side, close to the human ear, of the cover body and is electrically connected with the output end of the noise reduction control circuit and used for emitting sound with the opposite phase of sound waves of the noise. " However, the prior art has the defects that firstly, a single feedforward structure is adopted, noise information is collected only by means of one external microphone, the noise reduction effect is extremely easy to be influenced by the directivity and the distance of a noise source, the omnidirectional effective noise reduction is difficult to realize, and secondly, the noise reduction loudspeaker is directly attached to the outside of the earphone loudspeaker, so that the problem of sound interference or resonance is easily caused, and the conversation quality is influenced. Disclosure of utility model The utility model aims to solve the technical problems in the background art and provides a noise reducer for a telephone call of a prison family. In order to achieve the above purpose, the present utility model adopts the following technical scheme: Prison family telephone conversation noise reducer, including the earphone of being connected with the fixed telephone host computer to and lay the subassembly of making an uproar that falls on the earphone, the subassembly of making an uproar that falls includes: the cover body is covered on the earphone; the flexible circuit board is arranged on the inner wall of the cover body and comprises a power interface and a noise reduction control circuit; The microphone array is arranged at a position opposite to the front end and the rear end of the receiver on the cover body and is electrically connected with the input end of the noise reduction control circuit; The sound-absorbing material layer is arranged on the inner wall of the cover body at a position opposite to the front end of the receiver, and a sound-insulating cavity and a plurality of sound-emitting holes communicated with the sound-insulating cavity are arranged on the sound-absorbing material layer at a position close to the receiver; The noise reduction loudspeaker is arranged in the sound insulation cavity and is connected with the output end of the noise reduction control circuit; And the two-in-one switching wire is electrically connected between the earphone and the flexible circuit board and between the fixed telephone host. As a further description of the above technical solution: The microphone array includes: the feedforward microphone is arranged at the position opposite to the rear end of the receiver on the outer side of the cover body; the feedback microphone is arranged at the position opposite to the front end of the receiver on the inner side of the cover body; and the feedforward microphone and the feedback microphone are electrically connected with the input end of the noise reduction control circuit through FPC flexible flat cables. As a further description of the above technical solution: the feed-forward microphones are arranged in two numbers. As a further description of the above technical solution: the sound absorbing material layer is made of one of EVA foam, sponge or porous sound absorbing material. As a further description of the above technical solution: the one-to-two patch cord includes: the first RJ12 terminal is electrically connected with the receiver interface of the fixed telephone host; a second RJ12 terminal electrically connected to the earpiece; And the power connection terminal is electrically connected with a power interface of the flexible circuit board. As a further description of the above technical solution: the cover body is a hollow cup-shaped structure which is made of silica gel or TPU soft materials and imitates the shape of the earphone. As a further description of the