Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1982-08-10
1984-10-16
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360 18, 360 22, 360 27, G11B 1504, G11B 1502, G11B 543
Patent
active
044778481
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the recording of information or messages at a first time and the subsequent reproduction of such messages at a later time together with an indication of the authenticity of the reproduced message.
In many applications it is desirable to be able to, for example, tape record a conversation or verbal statement and then at a later date play back the statement or conversation in such a way that the authenticity of the recording cannot be called into question.
This is particularly the case if such recordings are to be used in legal proceedings, particularly to record statements, interviews or confessions by persons suspected of a crime. In order to be admissable as evidence in Court, such recordings must, when played back, be capable of ready detection if not in every way authentic.
Apparatus has previously been provided for the recording of conversations and messages, especially in the field of communication recording systems, which incorporates voice logging where a digital time code is simultaneously recorded with the speech and a visual numerical display provided on playback. A system of this kind is described in U.S. Pat. No. 4,194,222 which although employing multiplexing of the time code and the audio on a single channel, the time code is recorded out of phase between two channels to assist in cancelling the time code subsequently from the audio. In such a system, however, it is possible without detection to tamper with the message after segregating it and subsequently returning it to the tape. Prior art arrangements of this kind also suffer from other disadvantages in that they include the requirement for multiple recording heads and that the design of the recorder/encoder is far too complex.
Many systems have also been proposed for scrambled and encyphered transmission of audio signals with inclusion in the transmission of various control or synchronising signals. However, in those instances there is no safeguard incorporated against the form of tampering referred to above. The examples of such prior arts systems occur in the specifications of U.S. Pat. Nos. 4,193,061; 4,126,761; 4,052,565; 4,004,089; 3,696,207; 3,723,878 and 3,723,364.
It is the principal object of this invention to obtain in a reasonably simple and effective manner the verification of recorded messages.
According to one aspect of the present invention there is disclosed a method of recording an original audio message and of subsequently reproducing said message while indicating the authenticity of said reproduction, said method comprising the steps of converting said original audio message to a first electrical message signal, generating first message information dependent on the instantaneous content of said first electrical message signal, forming a data signal from said first message information; forming a composite signal from said first message signal and said data signal; recording said composite signal on a record medium; recovering said composite signal from said record medium; resolving said composite signal into a second electrical message signal and said data signal, generating second message information dependent on the instantaneous content of said second message signal; making a comparison between said second message information and the message information contained in the resolved data signal and providing an indication whenever said comparison reveals lack of parity.
According to another aspect of the present invention there is disclosed apparatus for reproducing an original audio message which has been recorded on a magnetic tape as a composite signal including also a first data stream indicative of instantaneous values of a parameter of said audio message at the time of recording said message, said apparatus comprising an audio section separating said message from said composite signal for playback of said audio message, encoding means responding to said separated audio message to produce a second data stream indicative of instantaneous values of said parameter of said separated audio
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McWhirter Ian
Morgan Richard B.
Canney Vincent P.
McWhirter Holdings PTY. Limited
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