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Signal transmitting system having spurious radiation preventing function
| Details |
Inventors: Nakagawa, Katsuya; Yamato, Satoshi;
Assignee: Nintendo Co., Ltd. (Osaka, JP)
Primary Examiner: Pellinen; A. D.
Assistant Examiner: Jennings; Derek S.
Attorney, Agent or Firm: Fasse; W. G., Kane, Jr.; D. H.
A signal transmitting system including a spurious radiation preventing circuit which comprises a differentiating circuit coupled to a signal line connected to a signal source for differentiating an original signal for emphasizing high frequency components of the signal, an adder circuit for adding the output from the differentiating circuit and the original signal, and a current booster for boosting the output from the adder circuit. The output from the current booster is applied to an output device through a high cut filter, so that spurious radiation from the signal line connecting the signal source with the output device is reduced. |
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DETAILED DESCRIPTION Accordingly, a principal object of the present invention is to provide an improved signal transmitting system capable of effectively preventing spurious radiation without causing any decrease of work efficiency or adversely affecting mass production requirements and also without causing any deterioration of the quality of a required signal.
Briefly stated, the present invention is directed to a signal transmitting system wherein high frequency components of a signal to be transmitted are emphasized in advance prior to transmittal and a high frequency component in the emphasized signal is attenuated, so that a spurious radiation component, that is, a spurious high frequency component is largely attenuated.
In accordance with the present invention, the quality of the original signal is not reduced and spurious radiation can be effectively prevented since high frequency components are emphasized in advance of their transmittal and thereafter the emphasized high frequency components are attenuated by high frequency attenuating means, together with the spurious components.
In an embodiment of the present invention, signal lines for transmitting an ON/OFF signal, such as a switching signal, to or from a signal processing circuit comprising a high frequency signal source, are always coupled to a reference potential, such as ground in terms of alternating current, irrespective of the ON or OFF state of a signal.
In accordance with the embodiment, a spurious signal component from a signal processing circuit is never radiated from a signal line since the ON/OFF signal is supplied to a signal processing circuit including a high frequency signal source or a signal line for withdrawing therefrom is connected to a reference voltage in terms of alternating current, irrespective of the ON or OFF state of a signal.
In addition to this, the structure is simplified and any decreases in mass productivity and work efficiency can be avoided.
In another embodiment of the present invention, a shielded casing and a printed circuit board covering an opening of the shielded casing are included and a circuit for preventing spurious radiation is wired and mounted on or attached to the printed board
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I/O Systems 
