Wireless communication data storing medium for receiving a plurality of carriers of proximate frequencies and a transmission/receiving method

• US 5,889,273 A
• Filed: 09/18/1996
• Issued: 03/30/1999
• Est. Priority Date: 09/19/1995
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Goto, Yuichi
• Primary Examiner(s): LEE, MICHAEL GUNYOUNG
• Application Number:
  US08/715,465
• Time in Patent Office: 923 Days
• Field of Search: 235/492, 235/380, 235/449, 235/487, 340/825.54, 340/825.34
• US Class Current: 235/492
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

A wireless communication data storing medium capable of effectively receiving carrier waves of different frequencies proximate to each other. A composite wave of a first carrier for supplying a source voltage and a second carrier for transferring data is received by a circuit. The composite wave is rectified to generate the source voltage, which is supplied to the internal circuits of the medium from a circuit. On the basis of the composite wave, an amplitude change corresponding to the data transferred by the second carrier is detected by a circuit. The data is extracted by a circuit on the basis of the amplitude change.

Claims

1. A wireless communication data storing medium comprising:

means for receiving a composite wave including a first carrier for supplying a source voltage and a second carrier for transferring data;

means for generating the source voltage by rectifying the composite wave and supplying the source voltage to internal circuits of the wireless communication data storing medium;

means for detecting an envelope of the composite wave and an amplitude change of the detected envelope corresponding to the data transferred by the second carrier, wherein the detecting means includes second detecting means for comparing a second amplitude of a subcarrier based on an envelope of the composite wave with an average amplitude of the subcarrier in synchronism with the first carrier, and detecting the amplitude change corresponding to the data in accordance with a result of the comparison; and

means for extracting the data based on the amplitude change of the envelope detected bv the detecting means.

2. A wireless communication data storing medium according to claim 1, wherein the detecting means includes

means for generating a clock signal of a same frequency as the first carrier.

3. A wireless communication data storing medium comprising:

means for receiving a composite wave including a first carrier for supplying a source voltage and a second carrier for transferring data;

means for generating the source voltage by rectifying the composite wave and supplying the source voltage to internal circuits of the wireless communication data storing medium;

means for detecting an envelope of the composite wave and an amplitude change of the detected envelope corresponding to the data transferred bv the second carrier, wherein the detecting means includes

second detecting means for detecting the amplitude change corresponding to the data based on the comparison between the amplitude change of the envelope of the composite wave and an average amplitude of the envelope; and

means for extracting the data based on the amplitude change of the envelope detected by the detecting means.

4. A wireless communication data storing medium according to claim 3, wherein the second detecting means includes

means for outputting the envelope based on a difference between the first carrier and the second carrier.

5. A wireless communication data storing medium according to claim 3, wherein the second detecting means includes

means for outputting the envelope having a frequency one fourth that of the first carrier.

6. A wireless communication data storing medium comprising:

means for receiving a composite wave including a first carrier for supplying a source voltage and a second carrier for transferring data;

means for generating the source voltage by rectifying the composite wave and supplying the source voltage to internal circuits of the wireless communication data storing medium;

means for detecting an envelope of the composite wave and an amplitude chance of the detected envelope corresponding to the data transferred bv the second carrier;

means for extracting the data based on the amplitude change of the envelope detected bv the detecting means; and

means for generating a radio wave of the transmission data by modulating a frequency signal in phase with the first carrier according to the transmission data.

7. A wireless communication data storing medium according to claim 6, wherein the generating means includes

means for dividing the frequency signal at a predetermined dividing ratio so as to adjust the frequency signal to a frequency of the envelope.

8. A data receiving method for a wireless communication data storing medium comprising the steps of:

receiving a composite wave including a first carrier for supplying a source voltage and a second carrier for transferring data;

generating the source voltage by rectifying the composite wave and supplying the source voltage to internal circuits of the wireless communication data storing medium;

detecting an envelope of the composite wave and an amplitude change of the detected envelope corresponding to the data transferred by the second carrier, wherein the detecting step includes comparing the amplitude change of the envelope of the composite wave with an average amplitude of the envelope in synchronism with the first carrier, and detecting the amplitude change corresponding to the data in accordance with a result of the comparison; and

extracting the data based on the amplitude change of the envelope detected by the detecting step.

9. A data receiving method according to claim 8, wherein the detecting step includes the step of

generating a clock signal of a same frequency as the first carrier.

10. A data receiving method according to claim 8, wherein the detecting step includes the second detecting step of

detecting the amplitude change corresponding to the data based on the comparison between the amplitude change of the envelope of the composite wave and an average amplitude of the subcarrier envelope.

11. A data receiving method for a wireless communication data storing medium comprising the steps of:

receiving a composite wave including a first carrier for supplying a source voltage and a second carrier for transferring data;

generating the source voltage by rectifying the composite wave and supplying the source voltage to internal circuits of the wireless communication data storing medium;

detecting an envelope of the composite wave and an amplitude change of the detected envelope corresponding to the data transferred bv the second carrier, wherein the second detecting step includes the step of outputting the envelope based on a difference between the first carrier and the second carrier; and

extracting the data based on the amplitude change of the envelope detected by the detecting step.

12. A data receiving method according to claim 11, wherein the second detecting step includes the step of

outputting the envelope having a frequency one fourth that of the first carrier.

13. A data receiving method for a wireless communication data storing medium comprising the steps of:

receiving a composite wave including a first carrier for supplying a source voltage and a second carrier for transferring data;

generating the source voltage bv rectifying the composite wave and supplying the source voltage to internal circuits of the wireless communication data storing medium;

detecting an envelope of the composite wave and an amplitude change of the detected envelope corresponding to the data transferred by the second carrier;

extracting the data based on the amplitude change of the envelope detected by the detecting step; and

transmitting a radio wave of the transmission data by modulating the frequency signal in phase with the first carrier in accordance with the transmission data.

14. A data receiving method according to claim 13, wherein the generating step includes the step of

dividing the frequency signal at a predetermined dividing ratio so as to adjust the frequency signal to a frequency of the first envelope.