 Method and apparatus for calibrating a display using an array of cameras |
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| Dual disc adapter with downward sloping outside corner wedges |
| The inventors have found that these two diverse sets of needs can be met by a single adapter insert ... |
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| Digital data storage assembly with particular hub adaptor |
| OF THE INVENTION Referring now to FIG. 1 of the drawing figures, there is shown an exploded ... |
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| CMOS to ECL output buffer |
| FIG. 1 illustrates an overall view of a circuit which includes conversion of CMOS voltage levels ... |
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| Processing system with delta-based video data encoding |
| The present invention involves apparatus and methods for providing video, audio, graphics, input/... |
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| Folded bag handle |
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| Method and apparatus for determining AM modulation factor |
| OF THE INVENTION As shown in FIG. 1, an AM signal (which is referenced to ground, as it will be ... |
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| Sampled differential analyzer |
| OF THE PREFERRED EMBODIMENTS FIG. 1 is a functional block diagram of the analyzer. The image ... |
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| Tube clarifier method for monitoring and/or controlling clarification processes |
| OF THE INVENTION The instant invention relates to a method for on-line monitoring and/or control ... |
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Modulator-demodulator apparatus and system
| Details |
Inventors: Kojima, Yasuyuki; Yokosuka, Yasushi; Shimanuki, Takeshi; Takaoka, Kazuhiko; Ishihara, Yukihito;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Chin; Stephen
Assistant Examiner:
Attorney, Agent or Firm: Antonelli, Terry, Stout & Kraus
In a MODEM having modulation and demodulation circuits and a circuit for controlling the modulation and demodulation, a modulator-demodulator apparatus includes a register for accepting a macro-instruction from an external source; a circuit for interpreting and executing the macro-instruction; and a circuit for outputting a response to the macro-instruction, whereby the MODEM is controlled in response to the macro-instruction accepted from the outside source. The modulator-demodulator apparatus is suitably integrated over a single semiconductor substrate. |
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DETAILED DESCRIPTION An object of the present invention is to provide an economical MODEM control system of high performance, which is suitable for a one-chip device for a general-purpose MODEM.
Another object of the present invention is to provide a function which enables an external device to know the internal state of a MODEM and to alter the content of the memory or register in the MODEM if it is so intended.
Still another object of the present invention is to provide a function which makes it possible to alter the signal processing parameters or the like in the MODEM before the start of the signal processing of the MODEM.
A further object of the present invention is to provide a function which makes it impossible to alter the modes or parameters with ease with ordinary commands after the signal processing state.
A further object of the present invention is to provide a function which can initialize the processing only with the modes or parameters to be altered.
A further object of the present invention is to provide both a MODEM VLSI capable of being applied to a high-speed MODEM and the MODEM.
A further object of the present invention is to provide a MODEM which is equipped with highly efficient hard and soft means.
The object of the present invention is achieved by providing a MODEM which comprises: modulating and de-modulating means; and means for controlling the first-named means, wherein the improvement comprises: means made receptive of a macro-instruction; means for interpreting and executing said macro-instruction; and means for outputting a response to said macro-instruction, whereby said MODEM is controlled by the macro-instruction received from the outside.
Moreover, another object of the present invention is achieved by setting a direct memory access (i.
e.
, DMA) instruction, which can refer to or alter the memories or registers in the MODEM, as the macro-instruction.
Moreover, still another object of the present invention is achieved by setting a set up (i.
e.
, STP) instruction, on which the operation modes or processing parameters of the MODEM are initialized in the memories or registers, before the start of the operations of the MODEM
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