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Dynmaic compressor for compressing analogue signal

A dynamic compression, analog signal technology, applied in electrical components, transmission systems, etc., can solve problems such as expansion trouble

Inactive Publication Date: 2003-04-09
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Subsequent expansion is cumbersome for logarithmic compression

Method used

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  • Dynmaic compressor for compressing analogue signal
  • Dynmaic compressor for compressing analogue signal
  • Dynmaic compressor for compressing analogue signal

Examples

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Embodiment Construction

[0029] Such as figure 1 As shown, the receiving coil 1 of the coil arrangement receives magnetic resonance signals. The magnetic resonance signal is extracted by a resonant capacitor 2 and fed to a dynamic compressor 4 via a preamplifier 3 . The simulated magnetic resonance signal will be compressed by a dynamic compressor 4 . The dynamic compressor 4 produces a (likewise analog) sum signal which has a smaller dynamic range than the original magnetic resonance signal. The absolute value of the curve of the sum signal is approximately equal to a power characteristic curve of the absolute value of the curve of the magnetic resonance signal above the minimum level. The power characteristic curve has an index whose value is typically between 0.2 and 0.5, in particular mainly between 0.3 and 0.35, for example one-third.

[0030] The sum signal is then introduced into a modulator 5 which modulates the sum signal on a high frequency carrier signal. The output signal of the modula...

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Abstract

In a dynamics compressor, an analog signal to be compressed is supplied to a first amplifier stage as an input signal, and the output signal thereof is supplied to the next amplifier stage as an input signal, and so on for a number of successive amplifier stages. Each amplifier stage amplifies its input signal with a stage amplification until it reaches a stage limit level. The analog signal and the respective output signals of the amplifier stages are summed in a summation stage to form a sum signal. Above a minimal level, the magnitude of the curve of the sum signal roughly corresponds to an exponent characteristic of the magnitude of the analog signal.

Description

technical field [0001] The invention relates to a dynamic compressor for compressing analog signals, which has several amplifier stages connected in series, [0002] - where the first stage of the amplification stage takes an analog signal as its input signal, and the other amplification stages take as its input signal the output signal of the preceding amplification stage, [0003] -Among them, each amplifier stage uses the stage gain to amplify the input signal input to it and then outputs it until the output signal output by it reaches the limit level of the stage, [0004] - wherein both the analog signal and the output signals of the amplifier stages are fed to a summing stage, from which a sum signal is output. Background technique [0005] The dynamic region of the magnetic resonance received signal is very large, but its relative bandwidth at the magnetic resonance frequency level is very small. Typically the dynamic region is about 100 dB and the observation bandw...

Claims

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Application Information

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IPC IPC(8): H04B1/64
CPCH04B1/64
Inventor 拉尔夫·奥佩尔特马库斯·维斯特
Owner SIEMENS AG