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Audio Signal Processing

Method-of-formation-of-channels-for-a-sonar-in-particular-for-a-towed-array-sonar

Audio system with amplifier and signal device

The present invention provides a sound system which is particularly adapted for use with such an ...

Correction circuit and method for improving the transient behavior of a two-way loudspeaker system

OF THE ILLUSTRATED EMBODIMENT Described herein are the transducers, correction circuits, a ...

Loudspeaker system

These and additional objects are accomplished by improvements in a loudspeaker system employing ...

Correction circuit and method for improving the transient behavior of a two-way loudspeaker system

OF THE ILLUSTRATED EMBODIMENT Described herein are the transducers, correction circuits, a ...

Hanging, positionable, speaker enclosure

OF THE INVENTION The above described drawing figure illustrates the invention, an enclosed audio ...

Digital duplex transmission system

We claim: 1. A digital duplex transmission system comprising: two terminals interconnected by a 2-...

Extended response dynamic noise reduction system

The block diagram of the preferred dynamic noise reduction system is illustrated in FIG. 1. The ...

Distortion-cancellation circuit for audio peak limiting

I claim: 1. In an audio peak limiting apparatus, an improvement for reducing distortion comprising: ...

Level control circuit for low and medium sound

It is an object of the present invention to provide a level control circuit for low and medium ...

Multi-signal processor synchronized system

We claim: 1. A multiprocessor system comprising: a plurality of signal processors each adapted to ...

Method of formation of channels for a sonar, in particular for a towed-array sonar

Details

Inventors: Gulli, Christian; Le Gall, Jean; Grall, Georges;
Assignee: Thomson-CSF (Puteaux, FR)
Primary Examiner: Pihulic; Daniel T.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt

In a method of formation of channels for a sonar, after having sampled at a frequency T=1/4f.sub.0 (where f.sub.0 is the receiving center frequency of the sonar) the signals from the hydrophones of the sonar and having translated them to baseband, the signals thus translated are subsampled with a period T.sub.SE =kT (wherein k is an integer) substantially equal to 1.25 B, where B is the reception bandwidth of the sonar. A first set of signals is subsampled at identical times to form a frontal sector. Two further sets of signals are subsampled with delays between the signals from two adjacent hydrophones equal to T, which determines two side sectors adjacent to the frontal sector. The subsampled signals are then transmitted serially by the towing cable of the sonar device towed array and are processed in FFT circuits which allow to form in each sector a set of channels covering the sector. This allows to considerably reduce the data transmission rate between the towed portion of the sonar and the portion located in the towing ship.

DETAILED DESCRIPTION To reduce the number of signals thus transmitted from the vehicle to the towing ship, the present invention proposes a method according to claim 1.

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