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Patent Searching and Data


Title:
COMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JP3798516
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a communication equipment that conducts an AM broadcast, AM stereo broadcast, and AM data multiplex broadcast and then receives them.
SOLUTION: In the case of transmitting a stereo signal modulation output, a changeover circuit 16 selects an output from an AM stereo modulator 13, and in the case of transmitting an AM data multiplex modulation output, the changeover circuit 16 selects an output from an AM data multiplex modulator 15 and transmits the selected output. When an AM stereo modulation output is received, an AM stereo signal demodulator 22 demodulates the AM stereo modulation output, a matrix circuit 23 separates demodulated sum and difference signals into left/light audio signals, and the operation of an AM data multiplex signal demodulator 24 is stopped by a pilot signal. On the other hand, when a monaural modulation output is received, the AM stereo signal demodulator 22 demodulates the monaural modulation output, sends it to the matrix circuit 23, and activates the AM data multiplex signal demodulator 24 to transmit demodulated digital data.


Inventors:
Ryuichi Okazaki
Kenichi Shiraishi
Application Number:
JP20103597A
Publication Date:
July 19, 2006
Filing Date:
July 11, 1997
Export Citation:
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Assignee:
Kenwood Corporation
International Classes:
H04H20/36; H04H40/36; H04H1/00; (IPC1-7): H04H5/00
Domestic Patent References:
JP8149166A
JP5145498A
JP1168132A
Other References:
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窪田登司,小野功,海老沢政良,ラジオの誕生からAMステレオ放送まで,エレクトロニクスライフ,日本放送出版協会,1992年 6月 1日,第718号,p.12-34
Dan Strassberg,DIGITAL-AUDIO BROADCASTING TAKES TO THE AIR,EDN THE DESIGN MAGAZINE OF THE ELECTRONICS INDUSTRY,米国,1996年 2月15日,p.67-68,70,72,74-75
Dion Messer Funderburk,A DIGITAL RECEIVER DESIGN FOR AM STEREO SIGNALS USING A GENERAL PURPOSE DIGITAL SIGNAL PROCESSOR,IEEE Transactions on Consumer Electronics,1994年 2月,第40巻, 第1号,p.64-74
坂井康朗,門脇覚,DAB in the USA,放送技術,兼六館出版株式会社,1992年 1月 1日,第45巻,第1号,80-85
社団法人電子情報通信学会 編,電子情報通信ハンドブック 第1分冊,株式会社オーム社,1988年 3月30日,第1版,p.1394-1395,1461