[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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This paper carries the analysis of crosstalk from sub-channel to main-channel of the multiplex-sound television receivers by theoretically examining the relationships between the crosstalk components and the various characteristics of the receiver circuits and reveals the mechanism of development of this crosstalk.
The authors point out that the above crosstalk is produced mainly as the nonlinear phase and amplitude distortion products of the sub-channel signal and the buzz and buzz beat components in the sound signal.
It is confirmed that the experimental results agree qulitatively with the theoretical analysis and the means to reduce the crosstalk are proposed.

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This paper deals with the evaluation of the signal to noise ratios in two typical quadraphonic FM broadcast systems, one with three transmission channels and the other with four transmission channels.
The relative noise increase, for the case of comparatively low receiver input RF signal level to which the noise output due to RF white noise is inversely proportional, is theoretically calculated and the relative audio signal level down due to correlation is measured by using quadraphonic music programmes.
As a result, relative SN ratios in quadraphonic broadcasting to the present monophonic and stereophonic broadcasting are clarified.
For example, compared to the streophonic reproduction of the present stereophonic broadcasting, the signal to noise ratio in quadraphonic reproduction is about 5 dB lower for the three-channel system, about 10 dB lower for the four-channel system and the signal to noise ratio in stereophonic reproduction is about 4 dB lower for both quadraphonic transmission systems.

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A three-layered thin film EL display panel is endowed with inherent memory function when the doping content of Mn exceeds 0.5 wt% and the deposition of an active layer is controlled to a suitable thickness.
In this paper, the following new technique and characteristics of electrical writing and erasing on the above EL panel are described. (1) Basic writing and erasing technique (2) Characteristics of the electrical analog writing by use of the amplitude modulation method or the pulse width modulation method (The result indicate the capability of this panel to display one frame still picture of TV.) (3) Characteristics of the electrical analog erasing and the discussion of erasing mechanism by using simple equivalent circuit presentation of the EL panel (4) Experimental results of graphic and picture display using a matrix type thin film EL panel with 240×180 dot elements

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