http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-111134956-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61F11-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61F11-08 |
| filingDate | 2019-12-24^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-02-19^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-02-19^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-111134956-B |
| titleOfInvention | Noise reduction earplug |
| abstract | The invention provides a noise-reducing earplug, which comprises a silica gel earmuff, a filter screen I, an earplug front cover, a microphone II, a phase inverter II, a loudspeaker, a phase inverter I, a microphone I, an earplug rear cover, a filter screen II, an earplug wire and a filter cavity cover, wherein the filter screen I is arranged on the silica gel earmuff; the filter cavity cover and the earplug rear cover form a physical structure filter cavity body for filtering environmental high-frequency noise, the medium-low frequency environmental noise forms pipeline type filtering by a phase inverter I and a phase inverter II for filtering residual high frequency and most intermediate-frequency noise, and the low-frequency noise finishes 180-degree phase inversion; the middle and low frequency environmental noise signal picked up by the first microphone is amplified and inverted by the first circuit to push the loudspeaker to send out a signal which is inverted with the external noise, so as to reduce and eliminate the middle and low frequency noise, and meanwhile, the sound signal picked up by the second microphone, overlapped and denoised, is amplified by the B circuit and is compared and sampled with the signal of the first microphone to control the phase of the A circuit inverted noise amplifier, so that the middle and low frequency noise signal sent into the loudspeaker to produce sound and the environmental middle and low frequency environmental noise are suppressed and eliminated in 180-degree inverted mode. |
| priorityDate | 2019-12-24^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID457707758 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID24261 |
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