Source: http://www.google.com/patents/US7729449?dq=5166694
Timestamp: 2014-07-29 22:03:41
Document Index: 634518841

Matched Legal Cases: ['art 16', 'art 16', 'art 18', 'art 18', 'art 42', 'art 42', 'art 44', 'art 44', 'art 16', 'art 42', 'art 16', 'art 42', 'art 18', 'art 44', 'art 74', 'art 80', 'art 74', 'Application No. 038181762']

Patent US7729449 - Digital signal processing and receiving apparatus and method - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA DSP tuner, which is equipped with an A/D converter and a digital signal processing part, is provided to the receiving parts of an in-vehicle equipment and a portable equipment that constitute an in-vehicle equipment remote control system. The A/D converter quantizes analog input signals received by...http://www.google.com/patents/US7729449?utm_source=gb-gplus-sharePatent US7729449 - Digital signal processing and receiving apparatus and methodAdvanced Patent SearchPublication numberUS7729449 B2Publication typeGrantApplication numberUS 11/023,694Publication dateJun 1, 2010Filing dateDec 29, 2004Priority dateJul 30, 2002Fee statusPaidAlso published asCN1672398A, CN100341304C, EP1553751A1, EP1553751A4, EP1553751B1, EP2290616A2, EP2290616A3, US20050123071, WO2004012441A1Publication number023694, 11023694, US 7729449 B2, US 7729449B2, US-B2-7729449, US7729449 B2, US7729449B2InventorsHiroki Okada, Yuichi MurakamiOriginal AssigneeToyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (24), Non-Patent Citations (3), Classifications (19), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetDigital signal processing and receiving apparatus and methodUS 7729449 B2Abstract A DSP tuner, which is equipped with an A/D converter and a digital signal processing part, is provided to the receiving parts of an in-vehicle equipment and a portable equipment that constitute an in-vehicle equipment remote control system. The A/D converter quantizes analog input signals received by receiving antennas and converts them into digital values. The digital signal processing part always appears, and removes as a noise a frequency band of which spectrum hardly change within a predetermined time period. Moreover, the digital signal processing part sets a frequency band with a comparatively large spectrum change as an FSK modulation signal corresponding to code contents, and outputs binary data corresponding to the frequency band as a code signal.
CROSS REFERENCE TO RELATED APPLICATIONS This application is a U.S. continuation application filed under 35 U.S.C. 111(a) claiming benefit under 35 U.S.C. 120 and 365(c) of PCT application JP2003/008213, filed Jun. 27, 2003, which claims priority to Application Ser. No. 2002-222005, filed in Japan on Jul. 30, 2002. The foregoing applications are hereby incorporated herein by reference.
SUMMARY OF THE INVENTION It is a general object of the present invention to provide an improved and useful digital signal processing and receiving apparatus and method in which the above-mentioned problems are eliminated.
It should be noted that the �uniqueness of the modulation signal� means an appearance continuation period, an output intensity, etc. of the modulation signal to be received.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a system equipped with a digital signal processing and receiving apparatus according to an embodiment of the present invention;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a structure of a system equipped with a digital signal processing and receiving apparatus according to an embodiment of the present invention. The system according to the present embodiment is an in-vehicle equipment remote control system, which comprises an in-vehicle equipment 10 and a portable equipment 12 having a digital signal processing and receiving apparatus so as to perform a control of permission or non-permission of use of a vehicle based on a result of code check according to radio communication between the in vehicle equipment and the portable equipment.
The transmitting part 16 outputs data binarized into �0� and �1� according to an instruction from the vehicle ECU 14 after converting the data into a radio frequency in a frequency range of, for example, 300 MHz-400 MHz. The modulated signal output from the transmitting part 16 is sent outward through the transmitting antenna 20. Additionally, when the radio frequency in a frequency range of 300 MHz-400 MHz transmitted by the portable equipment 12 is received through the receiving antenna 22, the receiving part 18 demodulates the received signal into binary data as mentioned later. The signal output from the receiving part 18 is supplied to the vehicle ECU 14.
The transmitting part 42 outputs data binarized into �0� and �1� according to an instruction from the portable ECU 140 after converting the data into a radio frequency in a frequency range of, for example, 300 MHz-400 MHz. The modulated signal output from the transmitting part 42 is sent outward through the transmitting antenna 46. Additionally, when the radio frequency in a frequency range of 300 MHz-400 MHz transmitted by the in-vehicle equipment 10 is received through the receiving antenna 48, the receiving part 44 demodulates the received signal into binary data as mentioned later. The signal output from the receiving part 44 is supplied to the portable ECU 40.
In the above-mentioned structure, both the transmitting part 16 of the in-vehicle equipment 10 and the transmitting part 42 of the portable equipment 12 performs an FSK (frequency shift keying) modulation, which shifts the frequency of the carrier wave in accordance with the code contents of Lo-data �0� and Hi-data �1�. For example, the modulation is performed by setting a first frequency fL in the band of 300 MHz-400 MHz as a carrier frequency of the Lo-data �0� and setting a second frequency fH higher than the first frequency fL in the band of 300 MHz-400 MHz as a carrier frequency of the Hi-data �1�.
It should be noted that the modulation signal corresponding to a combination of the Lo-data �0� and the Hi-data �1� that is sent outward from the transmitting part 16 by the in-vehicle equipment 10 through the transmitting antenna 20 is referred to as a request signal. Additionally, the modulation signal corresponding to a combination of the Lo-data �0� and the Hi-data �1� that is sent outward from the transmitting part 42 by the portable equipment 12 through the transmitting antenna 46 is referred to as a response signal.
In the present embodiment, the portable equipment 12 and the in-vehicle equipment 10 perform the FSK modulation to change the carrier frequency between the first frequency fL and the second frequency fH according to the contents of the cord of �0� and �1�, and output the response signal or the request signal. In this case, the receiving part 18 of the in-vehicle equipment 10 and the receiving part 44 of the portable equipment 12 receive the modulation signal having different carrier frequencies according to the contents of the cord. The contents of the cord is maintained at �0� or �1� for at least a constant time (a minimum change period of the cord; bit rate), and after a maximum period during which a state of one content is maintained has passed, the code contents changes to the other content. That is, after the maximum continuation time has passed in a state having one of the carrier frequencies fL and fH, the modulation signal to be received by the receive section 18, 44 always changes to a state having the other of the carrier frequencies fL and fH.
In the present embodiment, the carrier frequency of the portable equipment 12 and the in-vehicle equipment 10 is equal to the first frequency fL or the second frequency fH according to the code contents of �0� and �1� The spectrum level of the first or the second frequency fL or fH is maintained to be equal to or greater than a fixed level by a minimum change period (bit rate) of the code. On the other hand, a level of a wide-band noise such as a motor noise or an inverter noise generated by an electric car and a hybrid car changes greatly over its entire frequency band.
It should be noted that, in the above-mentioned embodiment, each of the receiving antenna 22 of the in-vehicle equipment 10 and the receiving antenna 48 of the portable equipment 12 corresponds to a �receiving antenna�; the A/D converter 72 corresponds to an �A/D converter�; the digital signal processing part 74 of the DSP tuner 70 corresponds to a �digital signal processing part�; the preamplifier 62 corresponds to an �amplifier circuit�; the mixer 64 corresponds to a �down converter�; and the memory part 80 corresponds to a �memory part�. Moreover, the digital signal processing part 74 performing the process of step 104 shown in FIG. 7 and the process of step 122 shown in FIG. 9 corresponds to �noise eliminating means�.
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