Author: claimsbot

1. A driving apparatus for a liquid crystal display comprising:
a signal modification unit which modifies a signal based on a data signal input to the liquid crystal display,
wherein the signal modification unit determines whether the data signal corresponds to an image to be displayed with a quality deterioration and outputs at least one of a first signal and a second signal,
wherein the first signal is output which changes a duration of a gate-on signal relative to a time duration during which the data signal is input to be a first interval when the signal modification unit determines the data signal corresponds to the image to be displayed with the quality deterioration,
wherein the second signal is output which changes the duration of the gate-on signal relative to a time duration during which the data signal is input to be a second interval when the signal modification unit determines the data signal does not correspond to the image to be displayed with the quality deterioration, and
wherein the first interval is longer than the second interval.
2. The driving apparatus of claim 1, wherein
the first signal and the second signal are control signals of a gate signal, and
a duration of the gate-on signal corresponding to the first signal is greater than a duration of a gate-on signal corresponding to the second signal.
3. The driving apparatus of claim 2, wherein
the signal modification unit comprises a line memory which stores the data signal input to a first data line of the liquid crystal display.
4. The driving apparatus of claim 3, wherein
the signal modification unit compares the data signal stored in the line memory with the data signal input to a second data line of the liquid crystal display.
5. The driving apparatus of claim 2, further comprising
a frame memory which stores data signals input during a previous frame, and
wherein the signal modification unit compares the data signal stored in the frame memory with data signals input during a current frame.
6. The driving apparatus of claim 2, wherein
the signal modification unit comprises a comparator which compares a common voltage of the liquid crystal display and a predetermined reference value.
7. The driving apparatus of claim 1, wherein
the signal modification unit comprises a line memory which stores the data signal input to a first data line of the liquid crystal display.
8. The driving apparatus of claim 7, wherein
the signal modification unit compares the data signal stored in the line memory with the data signal input to a second data line of the liquid crystal display.
9. The driving apparatus of claim 1, further comprising
a frame memory which stores data signals input during a previous frame, and
wherein the signal modification unit compares the data signal stored in the frame memory with the data signal input during a previous frame.
10. The driving apparatus of claim 1, wherein
the signal modification unit comprises a comparator which compares a common voltage of the liquid crystal display and a predetermined reference value.
11. The driving apparatus of claim 1, wherein the signal modification unit determines whether the data signal corresponds to an image to be displayed with a quality deterioration and outputs at least one of a first signal and a second signal irrespective of whether the data signal input is for an odd or even pixel column.
12. A driving method of a liquid crystal display, the method comprising:
determining whether a data signal input to the liquid crystal display corresponds to an image to be displayed with a display quality deterioration based on an data signal input to the liquid crystal display; and
outputting at least one of a first signal and a second signal based on the determining whether the data signal corresponds to the image to be displayed with the display quality deterioration,
wherein the first signal is output which changes a duration of a gate-on signal relative to a time duration during which the data signal is input to be a first interval when the signal modification unit determines the data signal corresponds to the image to be displayed with the quality deterioration,
wherein the second signal is output which changes the duration of the gate-on signal relative to a time duration during which the data signal is input to be a second interval when the signal modification unit determines the data signal does not correspond to the image to be displayed with the quality deterioration, and
wherein the first interval is longer than the second interval.
13. The driving method of claim 12, wherein
the first signal and the second signal are control signals of a gate signal, and
a duration of the gate-on signal corresponding to the first signal is greater than a duration of a gate-on signal corresponding to the second signal.
14. The driving method of claim 13, wherein
the determining whether the data signal input to the liquid crystal display corresponds to the image to be displayed with the display quality deterioration comprises comparing a data signal input to a first data line and stored in a frame memory with a data signal input to a second data line.
15. The driving method of claim 13, wherein
the determining whether the data signal input to the liquid crystal display corresponds to the image to be displayed with the display quality deterioration comprises comparing data signals during a previous frame and stored in a frame memory with data signals currently input.
16. The driving method of claim 13, wherein
the determining whether the data signal input to the liquid crystal display corresponds to the image to be displayed with the display quality deterioration comprises comparing a common voltage of the liquid crystal display with a predetermined reference value.
17. The driving method of claim 12, wherein
the determining whether the data signal input to the liquid crystal display corresponds to the image to be displayed with the display quality deterioration comprises comparing a data signal input to a first data line and stored in a frame memory with a data signal input to a second data line.
18. The driving method of claim 12, wherein
the determining whether the data signal input to the liquid crystal display corresponds to the image to be displayed with the display quality deterioration comprises comparing data signals stored in a frame memory which stores data signals input during a previous frame with data signals input during a current frame.
19. The driving method of claim 12, wherein
the determining whether the data signal input to the liquid crystal display corresponds to the image to be displayed with the display quality deterioration comprises comparing a common voltage of the liquid crystal display with a predetermined reference value.
20. The driving method of claim 12, wherein the determining whether a data signal input to the liquid crystal display corresponds to an image to be displayed with a display quality deterioration based on an data signal input to the liquid crystal display is irrespective of whether the data signal input is for an odd or even pixel column.

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 comprising:
determining a beamforming matrix for a transmitting device to use to precode data for transmission to a receiving device via a multicarrier MIMO channel, wherein determining is performed in said receiving device;
transmitting information, from said receiving device to said transmitting device, that identifies said beamforming matrix;
receiving dedicated pilot signals and data signals from said transmitting device, via said multicarrier MIMO channel, that were supposed to have been precoded by said transmitting device using said beamforming matrix, said dedicated pilot signals carrying known information; and
processing said dedicated pilots to validate whether said transmitting device actually used said beamforming matrix to precode said dedicated pilot signals and said data signals.
2. The method of claim 1, further comprising:
when processing said dedicated pilots determines that said transmitting device did not use said beamforming matrix to precode said dedicated pilot signals and said data signals but, instead, used another beamforming matrix to precode said dedicated pilot signals and said data signals, demodulating said data signals using said another beamforming matrix.
3. The method of claim 1, wherein:
processing said dedicated pilots to validate whether said transmitting device actually used said beamforming matrix to precode said dedicated pilot signals and said data signals includes using maximum likelihood detection to process said dedicated pilots.
4. The method of claim 3, wherein:
using maximum likelihood detection to process said dedicated pilots includes evaluating:
V
*

=
arg
\ue89e
\ue89e
min
V
i

\u2208
Codebook
\ue89e
\uf605

Y
–
HV
i

\ue89e
P
\uf606

2
where V* is the estimate of the beamforming matrix actually used by the transmitting device, Y is the received dedicated pilot signal, H is the channel matrix, P is the matrix transmitted within a dedicated pilot, and codebook is the codebook of possible beamforming matrices, wherein processing said dedicated pilots includes comparing V* to said beamforming matrix.
5. The method of claim 3, wherein:
using maximum likelihood detection to process said dedicated pilots includes performing a reduced complexity codebook search that includes a column wise search as follows:
v
i
*

=
arg
\ue89e
\ue89e
min
V
i

\u2208
Codebook
\ue89e
\uf605
Y
i

–

Hv
i
\uf606

2
2

\ue89e
\ue89e
i

=
1
,
\u2026
,

N
s
where vi* is the estimate of the ith column of the beamforming matrix actually used by the transmitting device, Yi is the ith column of the received dedicated pilot signal Y, H is the channel matrix, and codebook is the codebook of possible beamforming matrices.
6. The method of claim 4, wherein:
using maximum likelihood detection to process said dedicated pilots includes performing no validation when \u2225Y\u2212HViP\u2225 is less than a threshold value that is related to signal-to-noise ratio (SNR).
7. The method of claim 6, wherein:
said threshold value is equal to 7\u03c3n2\u22120.5 log10 (pe), where \u03c3n2 is the noise power and pe is the uplink bit error rate (BER).
8. A method comprising:
transmitting dedicated pilot signals from a transmitting device to a receiving device via a multicarrier MIMO channel, said dedicated pilot signals for use by said receiving device to validate whether said transmitting device utilized a specific beamforming matrix identified by said receiving device, wherein said dedicated pilot signals are distributed in time and frequency within a downlink (DL) physical resource block of said transmitting device that is directed to said receiving device, said DL physical resource block including a number of subcarriers within a number of consecutive multicarrier symbols.
9. The method of claim 8, wherein:
said dedicated pilot signals are approximately uniformly spaced in time and frequency within said DL resource allocation, with random offsets to avoid interference from neighbor cells.
10. The method of claim 8, wherein:
said dedicated pilot signals are spaced within said DL physical resource block as follows:
f
i

=

mod
\ue8a0

(
i
*

\u230a
N
c
N
d
\u230b
+

O
f
,

N
c
)
,
for
\ue89e
\ue89e
i

=
0

,
1
,
\u2026
,
N
d

–
1
t
i

=

mod
\ue8a0

(
i
*

\u230a
N
o
N
d
\u230b
+

O
t
,

N
o
)
,
for
\ue89e
\ue89e
i

=
0

,
1
,
\u2026
,
N
d

–
1
where the DL physical resource block consists of subcarriers indexed from 0 through Nc-1 and OFDM symbols indexed from 0 through Ns-1,fi and ti are the subcarrier and symbol indices of the dedicated pilots, Nd is the number of dedicated pilots in a physical resource block, mod( ) is the modulo operation; and Of and Ot are random offsets in frequency and time determined by the transmitting device.
11. The method of claim 8, wherein:
said dedicated pilot signals each carry a matrix P which is an Ns\xd7Nd matrix, where Ns is the number of active spatial streams in the multicarrier MIMO channel, Nd is the number of dedicatd pilots in a physical resource block, and each column of P is a vector in the form 0, 0, . . . 1, . . . 0 with all entries being zero except the ith entry, where i is the stream index assigned to the vector.
12. The method of claim 11, wherein:
said dedicated pilots are assigned to the spatial streams of the beamformed multicarrier MIMO channel in a round-robin fashion.
13. An apparatus comprising:
a wireless transceiver to facilitate communication with a remote wireless entity through a multicarrier MIMO channel; and
a controller to receive dedicated pilots signals and data signals from a remote wireless entity, via said wireless transceiver, and to process said dedicated pilot signals to determine whether said remote wireless entity used a predetermined beamforming matrix to precode said dedicated pilot signals and said data signals.
14. The apparatus of claim 13, wherein:
said dedicated pilot signals and data signals are received as part of a downlink (DL) physical resource block within a downlink subframe, said DL physical resource block including a number of subcarriers within a number of consecutive multicarrier symbols, wherein said dedicated pilot signals are uniformly spaced in time and frequency within said DL resource allocation, with random offsets to avoid interference from neighbor cells.
15. The apparatus of claim 14, wherein:
said dedicated pilot signals are spaced within said DL physical resource block as follows:
f
i

=

mod
\ue8a0

(
i
*

\u230a
N
c
N
d
\u230b
+

O
f
,

N
c
)
,
for
\ue89e
\ue89e
i

=
0

,
1
,
\u2026
,
N
d

–
1
t
i

=

mod
\ue8a0

(
i
*

\u230a
N
o
N
d
\u230b
+

O
t
,

N
o
)
,
for
\ue89e
\ue89e
i

=
0

,
1
,
\u2026
,
N
d

–
1
where the DL physical resource block consists of subcarriers indexed from 0 through Nc-1 and OFDM symbols indexed from 0 through Ns-1,fi and ti are the subcarrier and symbol indices of the dedicated pilots, Nd is the number of dedicated pilots in a physical resource block, mod( ) is the modulo operation; and Of and Ot are random offsets in frequency and time determined by the transmitting device.
16. The apparatus of claim 13, wherein:
said dedicated pilot signals each carry a matrix P which is an Nt\xd7Nd matrix, where Nd is the number of active spatial streams in the multicarrier MIMO channel, Nt is the number of transmit antennas of the transmitting device, and each column of P is a vector in the form 0, 0, . . . 1, . . . 0 with all entries being zero except the ith entry, where i is the stream index assigned to the vector.
17. The apparatus of claim 13, wherein:
said controller uses maximum likelihood detection to process said dedicated pilots to determine whether said remote wireless entity used a predetermined beamforming matrix to precode said dedicated pilot signals and said data signals.
18. The apparatus of claim 17, wherein:
said controller includes logic to evaluate:
V
*

=
arg
\ue89e
\ue89e
min
V
i

\u2208
Codebook
\ue89e
\uf605

Y
–
HV
i

\ue89e
P
\uf606

2
where V* is the estimate of the beamforming matrix actually used by the transmitting device, Y is the received dedicated pilot signal, H is the channel matrix, P is the matrix transmitted within the dedicated pilot signal, and codebook is the codebook of possible beamforming matrices.
19. The apparatus of claim 18, wherein:
said controller includes logic to determine which beamforming matrix was actually used by said transmitting device to precode said data and said dedicated pilot signals and logic to compare said beamforming matrix that was actually used by said transmitting device to said predetermined beamforming matrix.
20. An article comprising a storage medium having instructions stored thereon that, when executed by a computing platform, operate to:
determine a beamforming matrix for a transmitting device to use to precode data for transmission to a receiving device via a multicarrier MIMO channel, wherein determining is performed in said receiving device;
transmit information that identifies said beamforming matrix from said receiving device to said transmitting device;
receive dedicated pilot signals and data signals from said transmitting device, via said multicarrier MIMO channel, that were supposed to have been precoded by said transmitting device using said beamforming matrix, said dedicated pilot signals carrying known information; and
process said dedicated pilots to validate whether said transmitting device actually used said beamforming matrix to precode said dedicated pilot signals and said data signals.
21. The article of claim 20, wherein:
operation to process said dedicated pilots includes operation to use maximum likelihood detection to process said dedicated pilots.
22. The article of claim 21, wherein:
operation to use maximum likelihood detection to process said dedicated pilots includes operation to evaluate:
V
*

=
arg
\ue89e
\ue89e
min
V
i

\u2208
Codebook
\ue89e
\uf605

Y
–
HV
i

\ue89e
P
\uf606

2
where V* is the estimate of the beamforming matrix actually used by the transmitting device, Y is the received dedicated pilot signal, H is the channel matrix, P is the matrix transmitted within a dedicated pilot, and codebook is the codebook of possible beamforming matrices, wherein processing said dedicated pilots includes comparing V* to said beamforming matrix.
23. The article of claim 21, wherein:
operation to use maximum likelihood detection to process said dedicated pilots includes operation to perform a reduced complexity codebook search that includes a column wise search as follows:
v
i
*

=
arg
\ue89e
\ue89e
min
v
i

\u2208
Codebook
\ue89e
\uf605
Y
i

–

Hv
i
\uf606

2
2

\ue89e
\ue89e
i

=
1
,
\u2026
,

N
d
where vi* is the estimate of the ith column of the beamforming matrix actually used by the transmitting device, Yi is the ith column of the received dedicated pilot signal Y, H is the channel matrix, and codebook is the codebook of possible beamforming matrices.
24. The article of claim 21, wherein:
operation to use maximum likelihood detection to process said dedicated pilots includes operation to perform no validation when \u2225Y\u2212HViP\u2225 is less than a threshold value that is related to signal-to-noise ratio (SNR).
25. A system comprising:
multiple dipole antennas;
a wireless transceiver, coupled to said multiple dipole antennas, to facilitate communication with a remote wireless entity through a multicarrier MIMO channel; and
a controller to receive dedicated pilots signals and data signals from a remote wireless entity, via said wireless transceiver, and to process said dedicated pilot signals to determine whether said remote wireless entity used a predetermined beamforming matrix to precode said dedicated pilot signals and said data signals.
26. The system of claim 25, wherein:
said dedicated pilot signals and data signals are received as part of a downlink (DL) physical resource block within a downlink subframe, said DL physical resource block including a number of subcarriers within a number of consecutive multicarrier symbols, wherein said dedicated pilot signals are uniformly spaced in time and frequency within said DL resource allocation, with random offsets to avoid interference from neighbor cells.
27. The system of claim 25, wherein:
said dedicated pilot signals each carry a matrix P which is an Ns\xd7Nd matrix, where Ns is the number of active spatial streams in the multicarrier MIMO channel, Nd is the number of dedicated pilots in a physical resource block, and each column of P is a vector in the form 0, 0, . . . 1, . . . 0 with all entries being zero except the ith entry, where i is the stream index assigned to the vector.
28. The system of claim 25, wherein:
said controller uses maximum likelihood detection to process said dedicated pilots to determine whether said remote wireless entity used a predetermined beamforming matrix to precode said dedicated pilot signals and said data signals.
29. The system of claim 28, wherein:
said controller includes logic to evaluate:
V
*

=
arg
\ue89e
\ue89e
min
V
i

\u2208
Codebook
\ue89e
\uf605

Y
–
HV
i

\ue89e
P
\uf606

2
where V* is the estimate of the beamforming matrix actually used by the transmitting device, Y is the received dedicated pilot signal, H is the channel matrix, P is the matrix transmitted within the dedicated pilot signal, and codebook is the codebook of possible beamforming matrices.
30. The system of claim 25, wherein:
said controller includes logic to determine which beamforming matrix was actually used by said transmitting device to precode said data and said dedicated pilot signals and logic to compare said beamforming matrix that was actually used by said transmitting device to said predetermined beamforming matrix.

1. An image display apparatus comprising:
a display;
a shooting mode configured to display, on the display, a first image of an object currently being captured by an imaging unit;
a reproducing mode configured to display, on the display, at least one previously captured second image; and
a shooting and reproducing co-existent mode configured to display, on the display, at least part of the first image and at least part of the second image, the part of the second image displayed having a size different from a size of the part of the first image displayed,
wherein a transition from the shooting mode to the reproducing mode is intermediated by the shooting and reproducing co-existent mode or a transition from the reproducing mode to the shooting mode is configured to be intermediated by the shooting and reproducing co-existent mode.
2. The image display apparatus according to claim 1, wherein the first image and the at least one second image are displayed on a time axis in the shooting and reproducing co-existent mode.
3. The image display apparatus according to claim 2, further comprising:
an input device configured to receive a user input,
wherein the first image and the at least one second image are scrolled along the time axis in response to the user input.
4. The image display apparatus according to claim 3, wherein transition from the shooting mode to the reproducing mode and transition from the reproducing mode to the shooting mode are initiated in response to receipt of user input by the input device.
5. The image display apparatus according to claim 4, wherein the transition from the reproducing mode to the shooting mode is intermediated by a momentary stop.
6. The image display apparatus according to claim 3, wherein the input device is a rotary dial.
7. The image display apparatus according to claim 3, wherein the input device is a touch screen.
8. A method of causing an image display apparatus to display at least one image, comprising:
displaying, on a display, a first image of an object currently being captured by an imaging unit, when a shooting mode is active;
displaying, on the display, at least one previously captured second image, when a reproducing mode is active;
displaying, on the display, at least part of the first image and at least part of the second image, when a shooting and reproducing mode is active, the part of the second image displayed having a size different from a size of the part of the first image displayed;
intermediating, on the display, a transition from the shooting mode to the reproducing mode with the shooting and reproducing co-existent mode; and
intermediating, on the display, a transition from the reproducing mode to the shooting mode with the shooting and reproducing co-existent mode.
9. The method according to claim 8, wherein the first image and the at least one second image are displayed on a time axis in the shooting and reproducing co-existent mode.
10. The method according to claim 9, further comprising:
scrolling the first image and the at least one second image along the time axis in response to receipt of a user input at an input device, when the shooting and reproducing co-existent mode is active.
11. A non-transitory computer-readable medium encoded with computer-readable instructions thereon, the computer readable instructions when executed by a processor cause the processor to perform a method comprising:
displaying a first image of an object currently being captured by an imaging unit, when a shooting mode is active;
displaying at least one previously captured second image, when a reproducing mode is active;
displaying at least part of the first image and at least part of the second image, when a shooting and reproducing mode is active, the part of the second image displayed having a size different from a size of the part of the first image displayed;
intermediating a transition from the shooting mode to the reproducing mode with the shooting and reproducing co-existent mode; and
intermediating a transition from the reproducing mode to the shooting mode with the shooting and reproducing co-existent mode.
12. The non-transitory computer-readable medium according to claim 11, wherein the first image and the at least one second image are displayed on a time axis in the shooting and reproducing co-existent mode.
13. The non-transitory computer-readable medium according to claim 11, further comprising:
scrolling the first image and the at least one second image along the time axis in response to receipt of a user input at an input device, when the shooting and reproducing co-existent mode is active.
14. An image display apparatus comprising:
a display; and
a control unit configured to control the display to display a current image of an object currently being captured by an imaging unit and a previously captured image simultaneously,
wherein the control unit is configured to control, responsive to an instruction, the imaging unit to capture the current image as a new previously captured image, and
the control unit is configured to control, responsive to the instruction, the display to animate a gradual decrease in size of the new previously captured image, the gradual decrease including at least a two-step decrease.
15. The image display apparatus according to claim 14, further comprising:
an input device configured to generate the instruction in response to an external input.
16. The image display apparatus according to claim 15, wherein the input device is a shutter button.
17. A method of causing an image display apparatus to display at least one image, comprising:
displaying, on a display, a current image of an object currently being captured by an imaging unit and a previously captured image simultaneously;
capturing, in the imaging unit and responsive to an instruction, the current image as a new previously captured image; and
animating, on the display, a gradual decrease in size of the new previously captured image,
wherein the gradual decrease including at least a two-step decrease.
18. The method according to claim 17, wherein the instruction is generated in response to depression of a shutter button.
19. A non-transitory computer-readable medium encoded with computer-readable instructions thereon that when executed by a processor cause the processor to perform a method comprising:
displaying a current image of an object currently being captured by an imaging unit and a previously captured image simultaneously;
capturing, responsive to an instruction, the current image as a new previously captured image; and
animating a gradual decrease in size of the new previously captured image,
wherein the gradual decrease including at least a two-step decrease.
20. The non-transitory computer-readable medium according to claim 19, wherein the instruction is generated in response to depression of a shutter button.

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 compound having the formula
in which:
R1 is a member selected from the group consisting of \u2014OCH3, \u2014SCH3, \u2014N(CH3)2, \u2014NHCH3, \u2014CHO, \u2014COCH3 and \u2014CHOHCH3;
R2 is a member selected from the group consisting of halogen, alkyl, acyl, hydroxy, alkoxy, acyloxy, alkylcarbonate, cypionyloxy, S-alkyl and S-acyl;
R3 is a member selected from the group consisting of alkyl, hydroxy, alkoxy and acyloxy;
R4 is a member selected from the group consisting of hydrogen and alkyl; and
X is a member selected from the group consisting of \u2550O and \u2550N\u2014OR5, wherein R5 is a member selected from the group consisting of hydrogen and alkyl.
2. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2.
3. A compound in accordance with claim 1 in which:
R2 is halogen.
4. A compound in accordance with claim 1 in which:
R2 is alkoxy.
5. A compound in accordance with claim 1 in which:
R3 is acyloxy.
6. A compound in accordance with claim 1 in which:
R4 is alkyl.
7. A compound in accordance with claim 1 in which:
X is \u2550O.
8. A compound in accordance with claim 1 in which:
X is \u2550N\u2014OR5.
9. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 is halogen;
R3 is acyloxy;
R4 is alkyl; and
X is \u2550O.
10. A compound in accordance with claim 9 in which:
R2 is F.
11. A compound in accordance with claim 9 in which:
R2 is Br.
12. A compound in accordance with claim 9 in which:
R2 is Cl.
13. A compound in accordance with claim 9 in which:
R4 is methyl.
14. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 is alkyl;
R3 is acyloxy;
R4 is alkyl; and
X is \u2550O.
15. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 is alkoxy;
R3 is acyloxy;
R4 is alkyl; and
X is \u2550O.
16. A compound in accordance with claim 15 in which:
R2 is methoxy.
17. A compound in accordance with claim 15 in which:
R2 is ethoxy.
18. A compound in accordance with claim 15 in which:
R3 is acetoxy.
19. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 is hydroxy;
R3 is acyloxy;
R4 is alkyl; and
X is \u2550O.
20. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 and R3 are both acyloxy;
R4 is alkyl; and
X is \u2550O.
21. A compound in accordance with claim 20 in which:
R2 and R3 are both acetoxy.
22. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 is S-acyl;
R3 is a member selected from the group consisting of hydroxy and acyloxy;
R4 is alkyl; and
X is \u2550O.
23. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 is cypionyloxy;
R3 is acetoxy;
R4 is alkyl; and
X is \u2550O.
24. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 is methoxy;
R3 is acetoxy;
R4 is alkyl; and
X is \u2550N\u2014OR5.
25. A compound in accordance with claim 1 in which:
R1 is \u2014N(CH3)2;
R2 and R3 are both acetoxy;
R4 is alkyl; and
X is \u2550N\u2014OR5.
26. A pharmaceutical composition comprising an effective amount of a compound of claim 1 and a pharmaceutically acceptable excipient.
27. A method of producing an antiprogestational effect in a patient, said method comprising administering to said patient an effective amount of a compound of claim 1.
28. A method of inducing menses in a patient, said method comprising administering to said patient an effective amount of a compound of claim 1.
29. A method of treating endometriosis, said method comprising administering to said patient an effective amount of a compound of claim 1.
30. A method of treating dysmenorrhea, said method comprising administering to said patient an effective amount of a compound of claim 1.
31. A method of treating endocrine hormone-dependent tumors, said method comprising administering to said patient an effective amount of a compound of claim 1.
32. A method of treating uterine fibroids in a patient, said method comprising administering to said patient an effective amount of a compound of claim 1.
33. A method of inhibiting uterine endometrial proliferation in a patient, said method comprising administering to said patient an effective amount of a compound of claim 1.
34. A method of inducing labor, said method comprising administering to a patient an effective amount of a compound of claim 1.
35. A method of contraception, said method comprising administering to a patient an effective amount of a compound of claim 1.
36. A method of postcoital contraception, said method comprising administering to a patient an effective amount of a compound of claim 1.