One of the digital modulation systems which are used with the radio and the like.

After being converted, amplitude of the wave and using the both of phase, in order to express information, it is possible to transfer the data efficiently at the bandwidth which is limited. If states of amplitude 4 states of 4 and phase can be identified, with the transfer of 1 times it can send the information of 16 sorts with the 4×4.

We are adopted are widely utilized in the modem 2400 - 4800bps as modulation technique of standard after standard V.22bis regarding the modem of ITU-TS.

QCIF

Reading: Queue/cue sea eye f
Full spelling: Quarter Common Intermediate Format
Field:
Multimedia > animated picture > QCIF

ITU (the International Telecommunication Union) at one of standard of the image signal format which is decided, the 176×144 pixel, per second it corresponds to the image of 30 frames. Picture prime of CIF standard similarity ratio 1/2 (area ratio 1/4) it is the standard which reduces.

It is used with H.261 and H.263 of the image coded standard which ITU decides, H.320 and H.323 etc of video conference standard.

QCIF is used even in video photographing function and the like of the portable telephone.

QDOS

Reading: Queue/cue DOS
Full spelling: Quick and Dirty Operating System
Field:
OS > MS-DOS > QDOS

OS which was developed at the Seattle Computer Products corporation, has the operation system of the UNIX wind. Those which were bought at the Microsoft corporation, were rewritten in the one for PC/AT compatible machine by the same company are MS-DOS (PC-DOS). MS-DOS spread widely as a standard OS for the personal computer.

QFI

Reading: Queue/cue f eye
Full spelling: Quad Flat I-leaded package
Field:
Semiconductor > basis technology > QFI

One of package methods of IC tip/chip. Those which allot the pin for external input/output to the all around of the package. It has been similar to QFP, but form of the pin has become I letter type.

QFJ LCC

Reading: Queue/cue f Shea
Full spelling: Quad Flat J-leaded package
Alias:
Leaded Chip Carrier
Field:
Semiconductor > basis technology > QFJ

One of package methods of IC tip/chip. Those which allot the pin for external input/output to the all around of the package. It has been similar to QFP, but form of the pin has become the letter type of J.

Those which used the ceramics are many in the package, but those which designate the package as the plastic call PLCC (PQFJ) with.

QFN

Reading: Queue/cue f n
Full spelling: Quad Flat Non-leaded package
Field:
Semiconductor > basis technology > QFN

One of package methods of IC tip/chip. It has been similar to QFP, but the pin for external input/output has not come out.