| 摘要 |
12 The device can be used to carry out a pre-correction of the audio signals before they are amplified in amplification systems of transmitters with amplitude modulation, the amplification systems each comprising a determined number of modules generating pulses of modulated width, said modules being series-connected to the input of a filter. This device comprises: - an analog-digital converter to convert the audio signal to be transmitted into digital samples; - an interpolation circuit coupled to the output of the analog-digital converter to carry out respectively the computation, by a linear interpolation, of the slope of variation and the computation, by a parabolic interpolation, of the value of the audio signal applied to the input of the analog-digital converter; - and memorizing means coupled to the output of the interpolation circuit to memorize pre-correction values of the samples of the audio signal addressable by means of the interpolation values of the audio signal computed by the interpolation circuit. Application to the making of radioelectrical transmitters. Figure 3.
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