1. A method for reducing audio noise in an audio signal acquisition, comprising: receiving an input audio signal; separating the input audio signal into a high-frequency portion and a low frequency portion based on a threshold frequency; synthesizing the low-frequency portion to at least reduce any audio noise therein to generate a new low-frequency portion, wherein synthesizing the low-frequency portion comprises: computing an energy level for each of a plurality of segments of the low-frequency portion; separating the plurality of segments of the low-frequency portion into a high-energy level group and a low-energy level group based on the energy levels of the plurality of segments of the low-frequency portion; randomly selecting the energy level for one segment in the low-energy level replacing the energy levels of all the segments in the high-energy level group with the selected energy level to at least reduce any noise therein; combining the high-energy level group having the selected energy levels for the segments therein with the low-energy level group to generate the new low-frequency portion; combining the high-frequency portion and the new low-frequency portion to form a new audio signal representing the input audio signal; and outputting the new audio signal for the audio signal acquisition.
2. The method of claim 1, further comprising:
providing a memory buffer for the input audio signal upon receiving.
3. The method of claim 1, further comprising:
transforming the input audio signal into a spectral representation; and
transforming the new audio signal into a temporal representation prior to outputting.
4. The method of claim 1, further comprising:
selecting a predetermined threshold frequency as the threshold frequency for separating the input audio signal.
5. The method of claim 1, wherein separating the input audio signal comprises:
performing a signal analysis of the input audio signal to adaptively select the threshold frequency.
6. The method of claim 5, wherein performing the signal analysis of the input audio signal comprises:
dividing the input audio signal into a plurality of time segments;
computing an energy level of each of the plurality of time segments;
computing an average energy level of the plurality of energy levels of the plurality of time segments;
comparing the computed energy level of each of the plurality of time segments with the computed average energy level;
identifying at least one of the time segments as having the energy level above the computed average energy level; and
adaptively selecting the threshold frequency based on the at least one identified time segment.
7. The method of claim 1, further comprising:
maintaining the high-frequency portion, as initially formed from separating the input audio signal, for the combining with the new-low frequency portion.
8. The method of claim 7, wherein synthesizing the low-frequency portion comprises:
determining a randomness of each of a plurality of frequency bands in the low-frequency portion; and
synthesizing at least one of the plurality of frequency bands based on its determined randomness.
9. The method of claim 8, wherein determining the randomness of each of the plurality of frequency bands in the low-frequency portion comprises:
comparing randomness value of each of the plurality of frequency bands in the low-frequency portion with a predetermined threshold randomness value.
10. The method of claim 9, wherein synthesizing the low-frequency portion comprises:
maintaining without synthesizing at least one of the plurality of frequency bands having the randomness value above the threshold randomness value.
11. A system for reducing audio noise in a recording audio signal comprising: a first conversion module operable to receive and transform an input audio signal into a spectral representation; a signal separator module coupled to the first conversion module to receive and separate the transformed recording audio signal into a first portion having a first frequency range and a second portion having a second frequency range; a synthesizer module coupled to the signal separator module to receive the first portion with a noise signal and to synthesize the first portion to remove the noise signal, wherein synthesizing the low-frequency portion comprises:
computing an energy level for each of a plurality of segments of the low-frequency portion;
separating the plurality of segments of the low-frequency portion into a high-energy level group and a low-energy level group based on the energy levels of the plurality of segments of the low-frequency portion;
randomly selecting the energy level for one segment in the low-energy level group;
replacing the energy levels of all the segments in the high-energy level group with the selected energy level to at least reduce any noise therein; combining the high-energy level group having the selected energy levels for the segments therein with the low-energy level group to generate the new low-frequency portion; a frequency combiner module coupled to the signal separator module to receive the second portion and coupled to the synthesizer module to receive the synthesized first portion, the frequency combiner is operable to combine the second portion and the synthesized first portion into a new recording audio signal; and a second conversion module coupled to the frequency combiner module to convert the new recording audio signal from its spectral representation to its temporal representation.
12. The system of claim 11, wherein the first conversion module includes an analog-to-digital converter to digitize the input audio signal so as to transform the digitized input audio signal into a spectral representation.
13. The system of claim 11, wherein the system is a part of a recording device.
14. The system of claim 11, wherein the synthesizer module includes a pseudo-random number generator to assist with the synthesis of the first portion of the input audio signal.
15. The system of claim 11, wherein the signal separator module includes a memory buffer to maintain a segment of the transformed input audio signal for separation into the first portion and the second portion.
16. The system of claim 11, further comprising:
a signal analysis module operable to receive and perform a signal analysis of the transformed recording audio signal to generate a threshold frequency for use by the signal separator module to separate the transformed recording audio signal into the first portion and the second portion.
17. The system of claim 11, wherein the signal analysis module is a part of one of the first conversion module and the signal separator module.
18. A non-transitory computer readable medium on which is encoded program code for reducing audio noise in an audio signal acquisition, the encoded program code comprising: program code for receiving an input audio signal;
program code for separating the input audio signal into a high-frequency portion and a low-frequency portion based on a threshold frequency; synthesizing the low-frequency portion to at least reduce any audio noise therein to generate a new low-frequency portion, wherein synthesizing the low-frequency portion comprises: computing an energy level for each of a plurality of segments of the low-frequency portion; separating the plurality of segments of the low-frequency portion into a high-energy level group and a low-energy level group based on the energy levels of the plurality of segments of the low-frequency portion; randomly selecting the energy level for one segment in the low-energy level replacing the energy levels of all the segments in the high-energy level group with the selected energy level to at least reduce any noise therein; combining the high-energy level group having the selected energy levels for the segments therein with the low-energy level group to generate the new low-frequency portion; combining the high-frequency portion and the new low-frequency portion to form a new audio signal representing the input audio signal; and outputting the new audio signal for the audio signal acquisition.
19. The non-transitory computer-readable medium of claim 18, further comprising:
program code for providing a memory buffer for the input audio signal upon receiving.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for measuring response time of liquid crystal, comprising:
generating a liquid crystal driving signal having a variable voltage level that is changed in accordance with a response property of a liquid crystal display panel and a target voltage level;
supplying the liquid crystal driving signal to the liquid crystal display panel;
detecting the response property of the liquid crystal display panel corresponding to the liquid crystal driving signal;
adjusting the variable voltage level until the response property reaches a desired level;
setting a modulated data substantially equal to the variable voltage level when the response property reaches the desired level; and
searching modulated data for different temperatures by changing the temperature of the liquid crystal display panel and by repeating the generating step, the supplying step, the detecting step, the adjusting step and the setting step;
wherein the modulated data comprises:
a high temperature modulation data for the liquid crystal display panel in high temperature;
a normal temperature modulation data for the liquid crystal display panel in normal temperature; and
a low temperature modulation data for the liquid crystal display panel in low temperature.
2. The method according to claim 1, wherein the detecting the response property comprises:
detecting a brightness of the liquid crystal display panel;
generating a voltage signal corresponding to the detected brightness;
delaying the voltage signal for one time frame;
detecting a difference between the delayed voltage signal and a non-delayed voltage signal; and
comparing the difference with a predetermined critical value to determine whether the response property reaches the desired level based on the comparison result.
3. A liquid crystal display device including the liquid crystal display panel measured by the method according to claim 1, wherein the liquid crystal display panel comprises first and second substrates bonded to each other with a predetermined space therebetween, and the predetermined space is filled with the liquid crystal.
4. An apparatus for measuring response time of liquid crystal, comprising:
a temperature controller controlling temperature of a liquid crystal display panel;
a signal generator generating a liquid crystal driving signal having a variable voltage level that is changed in accordance with a response property of the liquid crystal display panel and a target voltage level, and supplying the liquid crystal driving signal to the liquid crystal display panel;
a detector detecting the response property of the liquid crystal display panel corresponding to the liquid crystal driving signal; and
a level controller adjusting the variable voltage level until the response property reaches a desired level and setting a modulated data substantially equal to the variable voltage level when the response property reaches the desired level, the modulated data based on temperatures being determined by changing the temperature of the liquid crystal display panel through the temperature controller;
wherein the modulated data comprises:
a high temperature modulation data for the liquid crystal display panel in high temperature;
a normal temperature modulation data for the liquid crystal display panel in normal temperature; and
a low temperature modulation data for the liquid crystal display panel in low temperature.
5. The apparatus according to claim 4, further comprising:
a temperature control chamber into which the liquid crystal display panel is loaded;
a temperature sensor detecting the temperature of the liquid crystal display panel; and
a coolingheating unit changing or maintaining the temperature within the temperature control chamber under control of the temperature controller.
6. The apparatus according to claim 5, further comprising:
a controller controlling the signal generator and the level controller and controlling the temperature controller in response to a temperature signal detected by the temperature sensor.
7. The apparatus according to claim 6,
wherein the detector comprises a photodetector detecting a brightness of the liquid crystal display panel, and generates a voltage signal corresponding to the detected brightness, and
wherein the level controller receives a first voltage signal of a previous time frame and a second voltage signal of a current time frame, detects a difference between the voltage signals, and compares the difference with a predetermined critical value to determine whether or not the response property reaches the desired level based on the comparison result.
8. The apparatus according to claim 6, wherein the liquid crystal driving signal comprises the target voltage level and the variable voltage level, and has a voltage level of at least 3.
9. A method for driving a liquid crystal display device, comprising:
storing modulation data corresponding to a plurality of temperature settings of a liquid crystal display panel;
detecting a current temperature of the liquid crystal display panel;
selecting the modulation data in accordance with the detected current temperature of the liquid crystal display panel; and
modulating source data to be applied to the liquid crystal display panel using the selected modulation data;
wherein the modulation data comprises:
a high temperature modulation data for the liquid crystal display panel in high temperature;
a normal temperature modulation data for the liquid crystal display panel in normal temperature; and
a low temperature modulation data for the liquid crystal display panel in low temperature.
10. The method according to claim 9, further comprising determining the modulation data corresponding to the temperature settings,
wherein the step of determining the modulation data corresponding to the temperature settings includes:
driving the liquid crystal display panel with a liquid crystal driving signal having a variable voltage level that is changed in accordance with a response property of the liquid crystal display panel and a target voltage level;
detecting a brightness of the liquid crystal display panel corresponding to the liquid crystal driving signal; and
setting the modulation data substantially equal to the variable voltage level of the liquid crystal driving data when the response property of the liquid crystal display panel reaches a desired level at a particular temperature.
11. The method according to claim 9, wherein the high temperature is about 40\xb0 C.\u02dc70\xb0 C., the normal temperature is about 15\xb0 C.\u02dc35\xb0 C., and the low temperature is about \u221220\xb0 C.\u02dc10\xb0 C.
12. The method according to claim 9, wherein one of the high temperature modulation data, the normal temperature modulation data and the low temperature modulation data is selected in accordance with the detected current temperature of the liquid crystal display panel for the selecting of the modulation data.
13. A driving apparatus of a liquid crystal display device, comprising:
a temperature sensor detecting a current temperature of a liquid crystal display panel; and
a modulator storing modulation data corresponding to a plurality of temperature settings of the liquid crystal display panel, selecting the modulation data based on the detected current temperature of the liquid crystal display panel, and modulating source data to be applied to the liquid crystal display panel using the selected modulation data;
wherein the modulation data comprises:
a high temperature modulation data for the liquid crystal display panel in high temperature;
a normal temperature modulation data for the liquid crystal display panel in normal temperature; and
a low temperature modulation data for the liquid crystal display panel in low temperature.
14. The apparatus according to claim 13, wherein the modulator includes:
a frame memory storing the source data from an input line;
a first look-up table having the high temperature modulation data;
a second look-up table having the normal temperature modulation data;
a third look-up table having the low temperature modulation data; and
a selector supplying source data from the input line and source data from the frame memory to any one of the first, second and third look-up tables based on the detected current temperature.
15. The apparatus according to claim 14, wherein the high temperature is about 40\xb0 C.\u02dc70\xb0 C., the normal temperature is about 15\xb0 C.\u02dc35\xb0 C., and the low temperature is about \u221220\xb0 C.\u02dc10\xb0 C.