التفاصيل البيبلوغرافية
| العنوان: |
Noise reducing apparatus, method and program and sound pickup apparatus for electronic equipment |
| Document Number: |
20070058822 |
| تاريخ النشر: |
March 15, 2007 |
| Appl. No: |
11/518895 |
| Application Filed: |
September 12, 2006 |
| مستخلص: |
A noise reducing apparatus is disclosed, which includes: input means for inputting multiple audio signals from multiple audio channels; multiple band extracting means for extracting a predetermined band from the multiple audio signals; calculating means for averaging signals from the multiple band extracting means; multiple first level detecting means for detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting means; second level detecting means for detecting the signal level in a predetermined period of time of the signal from the calculating means; selecting means for selecting, for each of the predetermined period of times, the signal having the lowest level value of the level values detected by the multiple first level detecting means and the second level detecting means; band limiting means for limiting the band of the signal from the selecting means; and band synthesizing means for band-synthesizing the signal from the band limiting means and the signal in a band, which is not extracted by the multiple band extracting means, for each audio channel, wherein the output of the band synthesizing means is an audio channel output signal. |
| Inventors: |
Ozawa, Kazuhiko (Kanagawa, JP) |
| Assignees: |
Sony Corporation (Tokyo, JP) |
| Claim: |
1. A noise reducing apparatus comprising: input means for inputting multiple audio signals from multiple audio channels; multiple band extracting means for extracting a predetermined band from the multiple audio signals; calculating means for averaging signals from the multiple band extracting means; multiple first level detecting means for detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting means; second level detecting means for detecting the signal level in a predetermined period of time of the signal from the calculating means; selecting means for selecting, for each of the predetermined period of times, the signal having the lowest level value of the level values detected by the multiple first level detecting means and the second level detecting means; band limiting means for limiting the band of the signal from the selecting means; and band synthesizing means for band-synthesizing the signal from the band limiting means and the signal in a band, which is not extracted by the multiple band extracting means, for each audio channel, wherein the output of the band synthesizing means is an audio channel output signal. |
| Claim: |
2. A noise reducing apparatus comprising: input means for inputting multiple audio signals from multiple audio channels; multiple band extracting means for extracting a predetermined band from the multiple audio signals; calculating means for averaging signals from the multiple band extracting means; multiple first level detecting means for detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting means; second level detecting means for detecting the signal level in a predetermined period of time of the signal from the calculating means; selecting means for selecting, in each audio channel and for each of the predetermined period of times, the signal having a lower level value between the level values from the multiple first level detecting means and the level value from the second level detecting means; multiple band limiting means for limiting the bands of the signals from the selecting means; and band synthesizing means for band-synthesizing the signals from the multiple band limiting means and the signal in the band, which is not extracted by the multiple band extracting means, for each audio channel, wherein the output of the band synthesizing means is an audio channel output signal. |
| Claim: |
3. The noise reducing apparatus according to claim 1 or 2, wherein the band extracting means includes multiple filter means. |
| Claim: |
4. The noise reducing apparatus according to claim 1 or 2, wherein the band extracting means includes fast Fourier transform means (FFT). |
| Claim: |
5. The noise reducing apparatus according to claim 1 or 2, wherein the minimum unit of the predetermined period of time is a period for sampling a noise band. |
| Claim: |
6. The noise reducing apparatus according to claim 1 or 2, further comprising: control means for adjusting the mix ratio between the multiple input audio signals and each audio channel output signal. |
| Claim: |
7. The noise reducing apparatus according to claim 6, wherein the control means adjusts the mix ratio based on a noise level. |
| Claim: |
8. A noise reducing method comprising the steps of: inputting multiple audio signals from multiple audio channels; extracting a predetermined band from the multiple audio signals; averaging signals from the multiple band extracting steps; detecting a first signal level in a predetermined period of time of the signals from the multiple band extracting steps; detecting a second signal level in a predetermined period of time from the averaging step; selecting, for each of the predetermined period of times, the signal having the lowest level value of the level values detected by the first signal level detecting step and the second signal level detecting step; limiting the band of the signal from the selecting step; and band-synthesizing the signal from the band limiting step and the signal in a band, which is not extracted by the multiple band extracting steps, for each audio channel, wherein the output of the band synthesizing step is an audio channel output signal. |
| Claim: |
9. A noise reducing method comprising: inputting multiple audio signals from multiple audio channels; extracting a predetermined band from the multiple audio signals; averaging signals from the multiple band extracting steps; detecting a first signal level in a predetermined period of time of the signals from the multiple band extracting steps; detecting a second signal level in a predetermined period of time of the signal from the averaging step; selecting, in each audio channel and for each of the predetermined period of times, the signal having a lower level value between the level values from the first signal level detecting step and the level value from the second signal level detecting step; limiting the bands of the signals from the selecting step; and band-synthesizing the signals from the multiple band limiting steps and the signal in the band, which is not extracted by the multiple band extracting steps, for each audio channel, wherein the output of each of the band synthesizing steps is an audio channel output signal. |
| Claim: |
10. A noise reducing program comprising: input means for inputting multiple audio signals from multiple audio channels; multiple band extracting means for extracting a predetermined band from the multiple audio signals; calculating means for averaging signals from the multiple band extracting means; multiple first level detecting means for detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting means; second level detecting means for detecting the signal level in a predetermined period of time of the signal from the calculating means; selecting means for selecting, for each of the predetermined period of times, the signal having the lowest level value of the level values detected by the multiple first level detecting means and the second level detecting means; band limiting means for limiting the band of the signal from the selecting means; and band synthesizing means for band-synthesizing the signal from the band limiting means and the signal in a band, which is not extracted by the multiple band extracting means, for each audio channel, wherein the output of the band synthesizing means is an audio channel output signal. |
| Claim: |
11. A noise reducing program comprising: input means for inputting multiple audio signals from multiple audio channels; multiple band extracting means for extracting a predetermined band from the multiple audio signals; calculating means for averaging signals from the multiple band extracting means; multiple first level detecting means for detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting means; second level detecting means for detecting the signal level in a predetermined period of time of the signal from the calculating means; selecting means for selecting, in each audio channel and for each of the predetermined period of times, the signal having a lower level value between the level values from the multiple first level detecting means and the level value from the second level detecting means; multiple band limiting means for limiting the band of the signals from the selecting means; and band synthesizing means for band-synthesizing the signal from the multiple band limiting means and the signal in the band, which is not extracted by the multiple band extracting means, for each audio channel, wherein the output of the band synthesizing means is an audio channel output signal. |
| Claim: |
12. A sound pickup apparatus for electronic equipment that picks up multiple audio signals from multiple audio channels, the apparatus comprising: multiple band extracting means for extracting a predetermined band from multiple audio signals; calculating means for averaging signals from the multiple band extracting means; multiple first level detecting means for detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting means; second level detecting means for detecting the signal level in a predetermined period of time of the signal from the calculating means; selecting means for selecting, for each of the predetermined period of times, the signal having the lowest level value of the level values detected by the multiple first level detecting means and the second level detecting means; band limiting means for limiting the band of the signal from the selecting means; and band synthesizing means for band-synthesizing the signal from the band limiting means and the signal in a band, which is not extracted by the multiple band extracting means, for each audio channel, wherein the output of the band synthesizing means is an audio channel output signal. |
| Claim: |
13. A sound pickup apparatus for electronic equipment that picks up multiple audio signals from multiple audio channels, the apparatus comprising: multiple band extracting means for extracting a predetermined band from the multiple audio signals; calculating means for averaging signals from the multiple band extracting means; multiple first level detecting means for detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting means; second level detecting means for detecting the signal level in a predetermined period of time of the signal from the calculating means; selecting means for selecting, in each audio channel and for each of the predetermined period of times, the signal having a lower level value between the level values from the multiple first level detecting means and the level value from the second level detecting means; multiple band limiting means for limiting the bands of the signals from the selecting means; and band synthesizing means for band-synthesizing the signals from the multiple band limiting means and the signal in the band, which is not extracted by the multiple band extracting means, for each audio channel, wherein the output of the band synthesizing means is an audio channel output signal. |
| Claim: |
14. A noise reducing apparatus comprising: an input section inputting multiple audio signals from multiple audio channels; multiple band extracting sections extracting a predetermined band from the multiple audio signals; a calculating section averaging signals from the multiple band extracting sections; multiple first level detecting sections detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting sections; a second level detecting section detecting the signal levels in a predetermined period of time of the signal from the calculating section; a selecting section selecting, for each of the predetermined period of times, the signal having the lowest level value of the level values detected by the multiple first level detecting sections and the second level detecting section; a band limiting section limiting the band of the signal from the selecting section; and a band synthesizing section band-synthesizing the signal from the band limiting section and the signal in a band, which is not extracted by the multiple band extracting sections, for each audio channel, wherein the output of the band synthesizing section is an audio channel output signal. |
| Claim: |
15. A noise reducing apparatus comprising: an input section inputting multiple audio signals from multiple audio channels; multiple band extracting sections extracting a predetermined band from the multiple audio signals; a calculating section averaging signals from the multiple band extracting sections; multiple first level detecting sections detecting the signal levels in a predetermined period of time of the signals from the multiple band extracting sections; a second level detecting section detecting the signal level in a predetermined period of time of the signal from the calculating section; a selecting section selecting, in each audio channel and for each of the predetermined period of times, the signal having a lower level value between the level values from the multiple first level detecting sections and the level value from the second level detecting section; multiple band limiting sections limiting the bands of the signals from the selecting section; and a band synthesizing section band-synthesizing the signals from the multiple band limiting sections and the signal in the band, which is not extracted by the multiple band extracting sections, for each audio channel, wherein the output of the band synthesizing section is an audio channel output signal. |
| Current U.S. Class: |
381094/100 |
| Current International Class: |
04 |
| رقم الانضمام: |
edspap.20070058822 |
| قاعدة البيانات: |
USPTO Patent Applications |