Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1988-05-16
1989-09-05
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
455214, 329316, 370 11, 381 2, H04B 116
Patent
active
048646377
ABSTRACT:
An improved FMX sterophonic broadcast receiver provided with countermeasures against transient noises, which includes a level detection circuit for detecting level of a detected stereo difference signal, and a level control circuit for controlling level of an expanded stereo difference signal according to an output signal of the level detection circuit. By the above arrangement of the present invention, since it is so arranged to cause the level control circuit to function when the degree of modulation becomes large so as to control the level of the stereo difference signal to be low, a level difference is produced between the stereo sum signal and the stereo difference signal for deterioration of the stereo separation degree upon matrixing at a matrix circuit for reduction of noises accordingly.
REFERENCES:
patent: 4079204 (1978-03-01), Takahashi et al.
patent: 4356567 (1982-10-01), Eguchi et al.
patent: 4472830 (1984-09-01), Nagai
patent: 4476581 (1984-10-01), Bragas
patent: 4486897 (1984-12-01), Nagai
patent: 4539697 (1985-09-01), Ishida et al.
patent: 4660193 (1987-04-01), Young et al.
Arai Masashi
Ishiguro Kazuhisa
Ishikawa Tsutomu
Ogawa Ryuichi
Tanaka Kanji
Griffin Robert L.
Kuntz Curtis
Sanyo Electric Co, Ltd.
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