Secure transmission of digital audio signals
First Claim
1. An audio interface device operable to provide a signal for controlling a telephone to communicate with a network via a data channel, the device comprising:
- a sampler that samples a received audio signal, and wherein the device is adapted to perform at least one of either encrypting and coding of at least one of the audio signal and one or more signals derived therefrom before providing them for transmission over the data channel.
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Accused Products
Abstract
In a headset audio speech signals are picked up by the microphone, where they are digitally sampled before being encoded by a vocoder. The coded speech data is then provided to a CRC module, where error correction data is added before the resulting data is encrypted by an encryption module. The resulting encrypted data is transmitted using a Bluetooth radio interface, by which the headset is connected wirelessly to a mobile telephone. Received data is decrypted by a decryption module, error corrected by an error correction module and decoded by a decoder, with the resulting audio signals then being reproduced at a speaker. When a user wants to instigate a telephone call with another telephone, the headset is caused to send a control signal to the mobile telephone instructing it to enter a data mode. A data call is then set up and, once established, the CPU controls the setting up of a 128 bit encryption key which is subsequently used for communications between the headset and a corresponding device associated with the recipient of the call. Encryption and decryption are performed only at the headset. This provides increased security since even if the call can be intercepted, the interceptor will need to decrypt the signals before being able to reproduce the audio signals.
45 Citations
25 Claims
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1. An audio interface device operable to provide a signal for controlling a telephone to communicate with a network via a data channel, the device comprising:
a sampler that samples a received audio signal, and wherein the device is adapted to perform at least one of either encrypting and coding of at least one of the audio signal and one or more signals derived therefrom before providing them for transmission over the data channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating an audio interface device, the method comprising acts of:
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controlling the device to provide a signal for controlling a telephone to communicate with a network via a data channel;
controlling the device to sample and to perform at least one of either;
a) encrypting, and b) coding audio signals or signals derived therefrom; and
controlling the device to provide the encrypted or coded signals, as the case may be, for transmission over the data channel.
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12. A method of transmitting audio signals, the method comprising acts of:
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controlling a mobile telephone to communicate with a network via a data channel;
sampling audio signals;
performing at least one of either;
a) encrypting, and b) coding the samples or data derived from the samples; and
providing the encrypted or encoded data, as the case may be, for transmission over the data channel.
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13. A system comprising:
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an audio interface device; and
a telephone, the audio interface device being operable to provide a control signal for controlling the telephone to communicate via a data channel, and to sample and either;
a) encrypt, or b) code audio signals or signals derived therefrom before providing them to the telephone, the telephone being responsive to receiving the control signal for communication with a network via a data channel, and being adapted to the encrypted or coded audio signals, as the case may be, over the data channel.
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14. A method of communicating between first and second devices, the method comprising acts of:
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in a first device, encrypting a session key using an encryption key;
sending the encrypted session key to the second device;
in the second device, decrypting the encrypted session key; and
using the session key to encrypt data transmitted in at least one direction between the first and second devices. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A communication device, comprising:
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an encryption module that is adapted to encrypt a session key and is adapted to encrypt data with the session key; and
a transmitter that is adapted to send the encrypted session key via a channel to another communication device and is adapted to send the encrypted data. - View Dependent Claims (22, 23, 24, 25)
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Specification