However, we should also remember that beauty is not the only criterion to measure a person or a woman.
When communication technology based on CDMA began to enter public life, the scientific community remembered Heidi Lamar, the 83-year-old mother of CDMA. The non-profit, unofficial EFF (Electronic Frontier Foundation) has long awarded Heidi Lamar the honor she deserves, but at this time her patent has expired and she will never benefit from it.
In addition, this beautiful woman died on June 65438+1October 19, 2000, which is a very long life for both an actress and a scientist. I am very happy.
She is the most incredible woman in the last century, and her value far exceeds Garbo, such as the mystery of the Sphinx.
Her beauty is amazing, she is free and easy. She was married eight times in her life, and she was the first actress to perform in a movie. Even a sexy goddess like Marilyn Monroe is ashamed of her romance.
But she has such a rigorous scientific mind and contributed such valuable inventions to the world.
Rama in light and shadow, a mysterious woman!
While Qualcomm was sitting at home counting money for CDMA patents, the core foundation of spread spectrum theory, the jewel in the crown of CDMA, lay in the file of "Secure Communication System" with the patent number of "2292387", and the application time was1941June 10. It was not until 1997 that hedy lamarr, the first applicant of this patent, was awarded the honorary technical medal by the American Electronic Frontier Foundation that she really came into our sight.
At the beginning of World War II, with the help of a powerful U-submarine, the Germans had obvious advantages in the North Atlantic. In order to strengthen this advantage, they began to try to use radio waves to remotely control the torpedo control system. This technology was later applied to wireless communication, interwoven with a technology called CDMA, whether WCDMA, CDMA2000 or TDSCDMA. By holding the patent of CDMA, this Fortune 500 company still maintains a double-digit annual growth, and will become a tax collector for 2 billion 3G users in the future.
Before that, Heidi was a symbol of "Hollywood vase". Because she is considered a vase, most people ignore her wisdom. "She has a very amazing patent. People usually don't think that a movie star has any brains, but she does. " Antonio Franklin, co-founder of Qualcomm, said. 1997, 3G technology based on CDMA began to enter people's field of vision, and the scientific community remembered the 83-year-old "mother of spread spectrum".
Heidi19141Kloc-0/.9 was born in a Jewish banker's family in Vienna. As a teenager, she soon fell in love with acting, gave up her optional communication major and went to Berlin to study acting. /kloc-Heidi, 0/6 years old, ushered in her first film "Money on the Street" with her unparalleled appearance and desire to perform. 1932, a film company in Czechoslovakia invited Heidi, aged 18, to be the heroine of ecstasy. Heidi became the first naked star in the world.
In this film, her beautiful face and graceful posture running in the Woods not only shocked the audience, but also brought overwhelming criticism. But Heidi doesn't think there's anything wrong with nudity. She said, "If you use your imagination, you can see any actress naked." Fritz Mandl, an Austrian arms tycoon, quickly turned his imaginary wish into action and married Heidi. Then he spent a lot of money to collect copies of movies and didn't allow anyone to have any "imagination" about his Miss Heidi.
Mandel was also a Jew, but he supported the Nazis and even became a supplier of the main Nazi armament, the Austrian army. He attaches great importance to radio signal remote control torpedo and wireless communication jamming technology. Although wireless communication technology was the top military secret of the country at that time, Mandel allowed Heidi to monitor and even record when talking with weapons experts about related technologies. He didn't expect Heidi, who was born in communication major, to basically master this technology in a few months. However, Mandel doesn't want his wife to show her face outside. She once mentioned that she wanted to continue making movies, but Mandel rudely refused. "I don't even have the freedom to swim and go to the streets." This made Miss Heidi give up Mandel completely. During World War II, all parties involved in the war wanted to improve the torpedo hit rate. They usually use wireless signals to guide torpedoes. But the enemy can also make the torpedo deviate from the target by interfering with the radio signal. Early communications were transmitted simultaneously on a single channel. When the enemy detects the pilot channel, it can effectively interfere with the signal. Heidi thinks she can solve the technical bottleneck of wireless signal channel separation. She imagined that several narrow-frequency channels were used to spread information simultaneously at the transmitting and receiving ends of torpedoes. These signals are transmitted in a random channel sequence, and the receiver combines the discrete signals in the same order. In this way, the received signal is noise for the receiver who does not know the channel sequence. At the same time, because the receiver only needs to be sensitive to specific sequence signals in several special frequency bands, it has strong immunity to general noise. And it is impossible for the enemy to achieve full-band interference. But how do we do this?
At this time, she met the legendary musician George Antell. Antle was one of the top avant-garde composers at that time. He wrote and played many works, such as "Aircraft Sonata", "Jazz Sonata" and "Death of a Machine", which made him famous for a while. From 65438 to 0933, antle began to compose movie music for Hollywood and began to study human endocrine.
At first, Heidi just regarded Antell as a gland expert and asked him how to make her breasts bigger. Later, the dialogue between them changed from glands to weapons. Antle suggested that the idea of "frequency hopping" could be realized by learning from the practice of automatic piano. The automatic piano is much like an old computer. It is played by reading the coded perforated paper tape. 1940, 19 In February, they sent a note to the National Committee of Inventors. In August, 1942, this invention was granted an American patent.
The patent specification describes a communication mode of guided torpedo: in a fixed period of time, the transmitter and receiver use synchronous communication mode between carrier frequencies. The number of carrier frequency synchronizations used by transmitter (airplane) and receiver (torpedo) is controlled by a device similar to an automatic piano music box, which has a unique sequence of 88 possible steps. By sending only a small part of the total information on each frequency, the torpedo can be operated. The attempt to interfere with communication can only be that one channel fails once, and the information on other channels is enough to ensure that the torpedo makes the necessary direction correction and hits the target. At that time, not many people thought that music devices could be put into torpedoes. Antle laughed at himself for this: "The mistake we made was to quote the principle of automatic piano in order to let the audience better understand this technology." Soon, Heidi and antle returned to their respective art circles. Frequency hopping technology sank into the old paper pile.
In World War II, Americans never used frequency hopping technology to attack Nazi warships. As far as people know, it was first realized in the mid-1950s. It involves two-way communication between aircraft and equipment called sonar buoys. At that time, the US Navy granted Hoffman Radio a patent to produce sonar buoys and radios accompanying aircraft. However, the name of the inventor was deleted from the document, and the information provided was extremely confidential. Hoffman's technicians had no idea that the patent was made by an actress and a musician.
Finally, Hoffman Radio Company completed the frequency hopping mechanical equipment. On this basis, the military has developed many products, including a remote-controlled drone used in the Vietnam War. During the Cuban missile crisis, "frequency hopping" constituted a maritime blockade between warships in the form of covert communication.
After the cold war, the US military deregulated frequency hopping technology and allowed it to be commercialized. At the same time, the development of electronic transistors makes it easier to realize the "frequency hopping" technology. The transformation of frequency synchronization method from mechanical to electronic has promoted its universal realization. Electronic communication and wireless technology have made great progress, and technologies such as mobile phone, satellite communication and wireless network have led the information age. On the basis of "frequency hopping" technology,/kloc-0 established a little-known American company in San Diego in 1985, and quietly developed a CDMA wireless digital communication system. This company is Qualcomm. Qualcomm has become one of the top 500 enterprises in the world, but Heidi, the inventor of its theoretical origin, has almost been forgotten.