Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion
Patent
1997-11-21
2000-11-21
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
380253, H04H 900
Patent
active
061515787
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns the signal broadcasting field for signals including an audio-frequency component. More especially, it concerns a data broadcasting system.
2. Description of the Related Art
The broadcasting field (broadcasting of TV or radio programmes, radiotelephony, etc.) is well known.
A current tendency is to transmit, in addition to the programmes (or sound in the telephony field), data useful for the broadcasting companies, for control organisations, or for listeners or viewers. This data can concern for example: search for a radio station by name, search by type of programme, search by menu, etc.), (for example the name of the company which created a programme, the title of a film broadcast by a TV channel, the record reference of a song broadcast by a radio station, etc.),
We also remark the development of so-called interactive broadcasting systems which allow the viewers or listeners to dialogue in a more or less efficient manner with the programme source. These means are used either to act on the content of the broadcast programme, or to play, bet or communicate on the subject of this same programme. Thus, a form of interactivity, via small devices simulating pseudodialogue with a programme designed for this purpose, recently appeared. A remote-sized unit gives the illusion of interactivity as it allows, for instance, to reply to a televised question/reply game as and when the questions are asked. Or again, an electronic device dissimulated in a fluffy toy allows the toy to react to a broadcast programme or a programme played back on a video cassette recorder. In fact, the interactivity is not real as the string of good replies or the reactions of the toy follows preestablished sequences, common to the memory of the interactive device and the broadcast or played back programme. As the audiovisual sequence was prerecorded in accordance with a selected code, its execution is predictable and therefore the only information to be transmitted to the interactive device is the start signal and the exact timing of the questions/replies or the various possible reactions in the case of a toy.
There is also a demand for the automatic identification of a sound sequence, accompanied by an image or not. For the broadcasters, this is used to check that a given programme is correctly broadcast on the frequency allocated to it; this can become fairly complex when a national programme is affected by regional or local disconnectings. This also allows the controlling bodies to count the broadcasting of works protected by copyrights or to check the conformity of the broadcasting of commercials. Finally, for sample survey or audience evaluation organisations, it is used to rapidly identify that which is actually listened to or seen by a listener or a viewer. Today, to assess a radio audience, the only solution available is to conduct a sample survey by interviewing the consumers.
All these applications are easy to incorporate when designing new radio or TV broadcasting systems, especially digital systems. However, existing systems and equipment populations do not in general easily lend themselves well to this development and experience proves that, from a sales engineering viewpoint, the compatibility and the relative cost of the processes and devices to be implemented are critical factors when introducing a new service.
For the transmission of data concerning a broadcast programme, two techniques are currently used.
The first technique consists in transmitting these data outside of the passband occupied by the signal of the transmitted programme (sound and possibly image). A solution exists, for instance, in sound broadcasting by multiplex frequency modulation, in using the upper part of the multiplex, between 54 and 76 kilohertz. Another example consists in using the lines available during frame retrace for TV broadcasting. These techniques have drawbacks. The saturation of the frequency resources available for broadcasting limits the number of users of th
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Bourcet Patrice
Jahan Bruno
Masse Denis
Hudspeth David R.
Telediffusion de France
Zintel Harold
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