(12) United States Patent
(10) Patent N0.: US 6,947,893 B1
Iwaki et al. (45) Date of Patent: Sep. 20, 2005 (54) ACOUSTIC SIGNAL TRANSMISSION WITH 6,574,349 B1 * 6/2003 Linnartz et al. .......... .. 382/100 INSERTION SIGNAL FOR MACHINE 6,650,761 B1 * 11/2003 Rodriguez et al. ........ .. 382/100 CQNTRQL 6,748,362 B1 * 6/2004 Meyer et al. ............. .. 704/500 6,779,112 B1 * 8/2004 Guthery . . . . . . . . . . . . . . . . . .. 713/172
(75) Inventors: Satoshi Iwaki, Iruma (JP); Akira gZ:il1;yet~aI.~~~.~.~
Nakayama, Hachioji (JP); Tamotsu
Machino, Tokorozawa (JP); Ikuo
Kitagishi, Hachioji (JP); Yukihiro
Nakamura, Higashiyamato (JP)
JP 62—145697 9/1987
JP 62—183894 11/1987
JP 8—37511 2/1996
JP 11—327872 11/1999
(Continued)
KitaWaki, “Speech Communication Technology—Speech and Acoustic Technologies for Multimedia Services”, Corona Publishing Co., Ltd. (1996) (With abstract).
Primary Examiner—Martin Lerner
(74) Attorney, Agent, 0r Firm—Thelen Reid & Priest, LLP
The acoustic signal transmission includes electrically synthesizing an audible sound signal and an insertion signal to generate a synthesized sound electrical signal at the sending side, transmitting the synthesized sound electrical signal, and extracting the insertion signal form the synthesized sound electrical signal at the receiving side. The extracted signal may be used for controlling machines or for transmitting information. The acoustic signal represented by the synthesized sound electrical signal can be heard by human ears in the same Way as the audible sound signal, While the synthesized insertion signal cannot be detected by human ears. The synthesized sound electrical signal can be transmitted as a sound Wave in air space, as electrical signals through a transmission line or as radio signals such as infrared and electromagnetic Waves. The synthesized sounds may also be transported or distributed by recording on recording media such as compact disc and DVD.
10 Claims, 54 Drawing Sheets
)5 7; SYNTHESIZED SOUND
/ E
Page 2 FOREIGN PATENT DOCUMENTS Nikkei Electronics, “Digital Signal Processing, Data hiding technique to support electronic Watermark (part one)”, pp. JP 2000820744 1/2000 149-162, NO. 683 (Feb. 24, 1997) (With abstract). QTHER PUBLICATIQNS Nikkei Electronics, “Digital Signal Processing, Data hiding
. . . . . . . I ll i t t l t i t k It ”, . Nikkei Electronics, “Special Issue—Digital Signal Process- ec mque O Suppor 6 ec romc Wa ermar (par W0) pp
_ _ _ _ 1153-168, No. 684 (Mar. 10, 1997) (With abstract).
ing, ‘Electronic Watermark’ protects multimedia age”, pp.
149-162, No. 683 (Feb. 24, 1997) (With abstract). * cited by examiner
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