1. An apparatus for driving a liquid crystal display (LCD) device comprising:
a liquid crystal display (LCD) panel that receives video signals, and displaying an image corresponding to the video signals;
a backlight for emitting light on the LCD panel;
a timing controller that controls the LCD panel and the backlight;
a driving system outputs a clock signal from an external part, a vertical and horizontal synchronous signals to the timing controller;
a signal generator which receives the clock signal and the horizontal signal applied to the timing controller, and modulates the received clock signal such that said signal generator generates a signal synchronized with the horizontal synchronous signal and which has the same frequency as that of the horizontal synchronous signal; and
an inverter which receives said signal from the signal generator, allows a driving frequency of the backlight to be the same as that of the horizontal synchronous signal, and allows the received signal to be synchronized with the horizontal synchronous signal.
2. The apparatus according to claim 1, wherein the signal generator is embedded in the timing controller.
3. The apparatus according to claim 1, wherein the signal generator is constructed separately from the timing controller.
4. A method for driving a liquid crystal display (LCD) device including a timing controller, which receives video signals and various control signals and drives a liquid crystal display (LCD) panel using the received signals, the method comprising:
supplying a clock signal from a driving system, and a vertical and horizontal synchronous signals to the timing controller,
receiving the clock signal and the horizontal synchronous signal applied to the timing controller, modulating the received clock signal, allowing the modulated clock signal to be synchronized with the horizontal synchronous signal, and generating a signal synchronized with the horizontal synchronous signal; and
allowing an inverter output frequency to have the same frequency as that of the horizontal synchronous signal by the modulated signal, allowing the inverter output signal to be synchronized with the horizontal synchronous signal, and driving a light source using the synchronized inverter output signal.
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. Apparatus for manipulating an audio signal comprising a transient event, comprising:
a signal processor configured for processing an audio signal comprising a first time portion of the audio signal, the first time portion comprising the transient event to acquire a processed audio signal;
a signal inserter configured for inserting a second time portion into the processed audio signal at a signal location where the transient event is located in the processed audio signal, so that a manipulated audio signal is acquired,
wherein the signal processor is configured to perform, in the processing of the audio signal, a stretching of the first time portion of the audio signal, the first time portion of the audio signal comprising the transient event, to obtain a stretched first time portion comprising a stretched transient event, wherein the stretched first time portion has a duration equal to a duration of the second time portion, the duration of the second time portion is longer in time than a duration of the first time portion, and
wherein the signal inserter is configured
to copy the first time portion of the audio signal comprising the transient event and a signal portion of the audio signal before the transient event or a signal portion of the audio signal after the transient event to obtain the second time portion of the audio signal,
wherein a length of the signal portion before the transient event or a length of the signal portion after the transient event is determined so that the length of the signal portion before the transient event or the length of the signal portion after the transient event added to a length of the first time portion is equal to the duration of the second time portion, and
wherein the signal inserter is configured to cut out the stretched first time portion from the processed audio signal and to insert the second time portion into the processed audio signal at a signal location where the stretched first time portion has been cut out.
2. Apparatus in accordance with claim 1, in which the signal inserter is configured to determine the second time portion so that the second time portion comprises an overlap with the processed audio signal at the beginning or at an end of the second time portion and in which the signal inserter is configured to perform a cross-fade at a border between the processed audio signal and the second time portion.
3. Apparatus in accordance with claim 1, in which the signal processor comprises a vocoder, a phase vocoder or an (P)SOLA processor.
4. Apparatus in accordance with claim 1, further comprising a signal conditioner for conditioning the manipulated audio signal by decimation or interpolation of a time-discrete version of the manipulated audio signal.
5. Apparatus in accordance with claim 1, in which the signal inserter is configured:
for determining a time length of the second time portion to be copied from the audio signal comprising the transient event,
for determining a start time instant of the second time portion or a stop time instant of the second time portion by finding a maximum of a cross correlation calculation, so that a border of the second time portion coincides with a corresponding border of the processed audio signal,
wherein a position in time of the transient event in the manipulated audio signal coincides with the position in time of the transient event in the audio signal or deviates from the position in time of the transient event in the audio signal by a time difference smaller than a pre-masking period or a post-masking period of the transient event.
6. Apparatus in accordance with claim 1, further comprising a transient detector for detecting the transient event in the audio signal, or
further comprising a side information extractor for extracting and interpreting a side information associated with the audio signal, the side information indicating a time position of the transient event or indicating a start time instant or a stop time instant of the first time portion or the second time portion.
7. Method of manipulating an audio signal comprising a transient event, comprising:
processing an audio signal comprising a first time portion of the audio signal, the first time portion comprising the transient event to acquire a processed audio signal;
inserting a second time portion into the processed audio signal at a signal location where the transient event is located in the processed audio signal, so that a manipulated audio signal is acquired,
wherein said processing comprises stretching of the first time portion of the audio signal, the first time portion of the audio signal comprising the transient event, to obtain a stretched first time portion comprising a stretched transient event, wherein the stretched first time portion has a duration equal to a duration of the second time portion, and wherein the duration of the second time portion is longer in time than a duration of the first time portion, and
wherein said inserting
copies the first time portion of the audio signal comprising the transient event and a signal portion of the audio signal before the transient event or a signal portion of the audio signal after the transient event to obtain the second time portion of the audio signal,
wherein a length of the signal portion before the transient event or a length of the signal portion after the transient event is determined so that the length of the signal portion before the transient event or the length of the signal portion after the transient event added to a length of the first time portion is equal to the duration of the second time portion, and
wherein the signal inserter is configured to cut out the stretched first time portion from the processed audio signal and to insert the second time portion into the processed audio signal at a signal location where the stretched first time portion has been cut out.
8. A non-transitory storage medium having stored thereon a computer program comprising a program code for performing, when running on a computer, the method of manipulating an audio signal comprising a transient event, comprising:
processing an audio signal comprising a first time portion of the audio signal, the first time portion comprising the transient event to acquire a processed audio signal;
inserting a second time portion into the processed audio signal at a signal location, where the first time portion was removed or where the transient event is located in the processed audio signal, so that a manipulated audio signal is acquired,
wherein said processing comprises stretching of the first time portion of the audio signal, the first time portion of the audio signal comprising the transient event, to obtain a stretched first time portion comprising a stretched transient event, wherein the stretched first time portion has a duration equal to a duration of the second time portion, and wherein the duration of the second time portion is longer in time than a duration of the first time portion, and
wherein said inserting
copies the first time portion of the audio signal comprising the transient event and a signal portion of the audio signal before the transient event or a signal portion of the audio signal after the transient event to obtain the second time portion of the audio signal,
wherein a length of the signal portion before the transient event or a length of the signal portion after the transient event is determined so that the length of the signal portion before the transient event or the length of the signal portion after the transient event added to a length of the first time portion is equal to the duration of the second time portion, and
wherein the signal inserter is configured to cut out the stretched first time portion from the processed audio signal and to insert the second time portion into the processed audio signal at a signal location where the stretched first time portion has been cut out.
9. Apparatus for manipulating an audio signal comprising a transient event, comprising:
a signal processor configured for processing an audio signal comprising a first time portion of the audio signal, the first time portion comprising the transient event to acquire a processed audio signal;
a signal inserter configured for inserting a second time portion into the processed audio signal at a signal location, where the transient event is located in the processed audio signal, so that a manipulated audio signal is acquired,
wherein the signal processor is configured to perform, in the processing of the audio signal, a stretching of the first time portion of the audio signal, the first time portion of the audio signal comprising the transient event, to obtain a stretched first time portion comprising a stretched transient event, wherein the stretched first time portion has a duration equal to a duration of the second time portion, and wherein the duration of the second time portion is longer in time than a duration of the first time portion, and
wherein the signal inserter is configured
to establish the second time portion using a copy of the first time portion of the audio signal comprising the transient event, and using a start portion of the processed audio signal in the stretched first time portion before the stretched transient event or an end portion of the processed audio signal in the stretched first time portion subsequent to the stretched transient event, and
wherein a length of the start portion of the processed signal before the stretched transient event or a length of the end portion of the processed signal before the stretched transient event is determined so that the length of the start portion of the processed signal before the stretched transient event or the length of the end portion of the processed audio signal after the stretched transient event added to a length of the first time portion is equal to the duration of the second time portion, and
wherein the signal inserter is configured to cut out the stretched first time portion from the processed audio signal and to insert the second time portion into the processed audio signal at a signal location where the stretched first time portion has been cut out.
10. Method of manipulating an audio signal comprising a transient event, comprising:
processing an audio signal comprising a first time portion of the audio signal, the first time portion comprising the transient event to acquire a processed audio signal;
inserting a second time portion into the processed audio signal at a signal location, where the transient event is located in the processed audio signal, so that a manipulated audio signal is acquired,
wherein the processing comprises stretching of the first time portion of the audio signal, the first time portion of the audio signal comprising the transient event, to obtain a stretched first time portion comprising a stretched transient event, wherein the stretched first time portion has a duration equal to a duration of the second time portion, and wherein the duration of the second time portion is longer in time than a duration of the first time portion, and
wherein the inserting comprises
establishing the second time portion using a copy of the first time portion of the audio signal comprising the transient event, and using a start portion of the processed audio signal in the stretched first time portion before the stretched transient event or an end portion of the processed audio signal in the stretched first time portion subsequent to the stretched transient event, and
wherein a length of the start portion of the processed signal before the stretched transient event or a length of the end portion of the processed signal before the stretched transient event is determined so that the length of the start portion of the processed signal before the stretched transient event or the length of the end portion of the processed audio signal after the stretched transient event added to a length of the first time portion is equal to the duration of the second time portion, and
wherein the signal inserter is configured to cut out the stretched first time portion from the processed audio signal and to insert the second time portion into the processed audio signal at a signal location where the stretched first time portion has been cut out.
11. A non-transitory storage medium having stored thereon a computer program comprising a program code for performing, when running on a computer, the method of manipulating an audio signal comprising a transient event, comprising:
processing an audio signal comprising a first time portion of the audio signal, the first time portion comprising the transient event to acquire a processed audio signal;
inserting a second time portion into the processed audio signal at a signal location, where the transient event is located in the processed audio signal, so that a manipulated audio signal is acquired,
wherein the processing comprises stretching of the first time portion of the audio signal, the first time portion of the audio signal comprising the transient event, to obtain a stretched first time portion comprising a stretched transient event, wherein the stretched first time portion has a duration equal to a duration of the second time portion, and wherein the duration of the second time portion is longer in time than a duration of the first time portion, and
wherein the inserting comprises
establishing the second time portion using a copy of the first time portion of the audio signal comprising the transient event, and using a start portion of the processed audio signal in the stretched first time portion before the stretched transient event or an end portion of the processed audio signal in the stretched first time portion subsequent to the stretched transient event
wherein a length of the start portion of the processed signal before the stretched transient event or a length of the end portion of the processed signal before the stretched transient event is determined so that the length of the start portion of the processed signal before the stretched transient event or the length of the end portion of the processed audio signal after the stretched transient event added to a length of the first time portion is equal to the duration of the second time portion, and
wherein the signal inserter is configured to cut out the stretched first time portion from the processed audio signal and to insert the second time portion into the processed audio signal at a signal location where the stretched first time portion has been cut out.