Copy secure multimedia RFID with analog transmitter
First Claim
1. A portable content playing device arranged within a housing, comprising:
- a radio frequency identification (RFID) receiving and decoding circuit, coupled to an RFID antenna circuit, configured to receive a given RFID signal and generate corresponding RFID digital input data;
a control unit configured to retrievably store multimedia content, receive a given read command signal and, in response, select multimedia content from the stored multimedia content, and generate the selected multimedia content as playback multimedia data;
a digital-to-analog converter (DAC) configured to convert the generated playback multimedia data to an analog multimedia playback signal, wherein digital access to the stored multimedia content is permanently disabled after initialization;
a modulator/transmitter, coupled to a transmitter antenna circuit, configured to modulate a given radio frequency (RF) carrier signal by the analog multimedia playback signal, generate a corresponding modulated RF carrier signal, and transmit the generated modulated RF carrier signal from the transmitter antenna circuit; and
a power supply configured to receive a given power input signal and generate a corresponding internal supply power to the RFID receiving and decoding circuit, the control unit, the DAC, and the transmitter wherein the control unit is configured to detect a write command in the RFID digital input data, detect multimedia content in the RFID digital input data, and retrievably store the detected multimedia content in accordance with the detected write command.
10 Assignments
0 Petitions
Accused Products
Abstract
A portable RFID device includes an analog modulation radio frequency transmitter and a data storage holding audio data files. In response to user entered commands the device retrieves the audio data files, applies digital to analog conversion to generate analog audio signals, and transmits the analog audio signals through the analog modulation RF amplifier. Optionally, the analog modulation RF amplifier is a frequency modulation (FM) modulator and transmitter, optionally using a UHF broadcast FM band. The transmitted analog modulated RF signal is received and played by a receiver and playback device proximal to the transmitter. Optionally, a locking operation is applied after storing the multimedia files, preventing subsequent altering of the files.
8 Citations
16 Claims
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1. A portable content playing device arranged within a housing, comprising:
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a radio frequency identification (RFID) receiving and decoding circuit, coupled to an RFID antenna circuit, configured to receive a given RFID signal and generate corresponding RFID digital input data; a control unit configured to retrievably store multimedia content, receive a given read command signal and, in response, select multimedia content from the stored multimedia content, and generate the selected multimedia content as playback multimedia data; a digital-to-analog converter (DAC) configured to convert the generated playback multimedia data to an analog multimedia playback signal, wherein digital access to the stored multimedia content is permanently disabled after initialization; a modulator/transmitter, coupled to a transmitter antenna circuit, configured to modulate a given radio frequency (RF) carrier signal by the analog multimedia playback signal, generate a corresponding modulated RF carrier signal, and transmit the generated modulated RF carrier signal from the transmitter antenna circuit; and a power supply configured to receive a given power input signal and generate a corresponding internal supply power to the RFID receiving and decoding circuit, the control unit, the DAC, and the transmitter wherein the control unit is configured to detect a write command in the RFID digital input data, detect multimedia content in the RFID digital input data, and retrievably store the detected multimedia content in accordance with the detected write command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A portable content playing device arranged within a housing, comprising:
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a radio frequency identification (RFID) receiving and decoding circuit, coupled to an RFID antenna circuit, configured to receive a given RFID signal and generate corresponding RFID digital input data; a control unit configured to retrievably store multimedia content, receive a given read command signal and, in response, select multimedia content from the stored multimedia content, and generate the selected multimedia content as playback multimedia data; a digital-to-analog converter (DAC) configured to convert the generated playback multimedia data to an analog multimedia playback signal, wherein digital access to the stored multimedia content is permanently disabled after initialization; a modulator/transmitter, coupled to a transmitter antenna circuit, configured to modulate a given radio frequency (RF) carrier signal by the analog multimedia playback signal, generate a corresponding modulated RF carrier signal, and transmit the generated modulated RF carrier signal from the transmitter antenna circuit; and a power supply configured to receive a given power input signal and generate a corresponding internal supply power to the RFID receiving and decoding circuit, the control unit, the DAC, and the transmitter, wherein the control unit is configured to detect a write command in the RFID digital input data, detect multimedia content in the RFID digital input data, and retrievably store the detected multimedia content in accordance with the detected write command, and wherein the control unit is configured to generate RFID output data, the RFID receiving and decoding circuit is further configured to receive the generated RFID output data and generate a corresponding RFID transmitter output signal, and the RFID antenna circuit is further configured to transmit the generated RFID transmitter output signal, receive a given RFID signal, and generate corresponding RFID digital input data.
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Specification