| 摘要 |
PURPOSE:To suppress noise even with overflow due to transmission error while keeping simple constitution by providing an inverse quantizing ROM, an adder, a forecast device and a D/A converter and a circuit detecting overflow from 2 inputs and an output of the adder, replacing the adder output into a constant in response to the output of the detection circuit and applying the result to the fore case device. CONSTITUTION:Since an overlow detection output is generated thereby giving an output to a forecast device while being replaced into an upper or a lower limit when there is an error and overflow takes place, a decoded output is clipped at upper and lower limits and a jump to an opposite peak is lost, then a large noise is prevented. For example, a detected output 54 is fed to a clip circuit 6 to replace the output data of an adder 2 is replaced into an upper/ lower limit data and outputted to an analog output terminal through a forecast device 3 and a D/A converter 4. An analog output waveform is shown in waveform diagram, and even if an error takes place and the signal reaches the limits, noise generation is prevented.
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