Abstract
MODERN broadcasting receivers tend to give an undue response to the lower audio frequencies, and in the majority of cases the range is limited to frequencies below 5,000 cycles per second. This is partly due to the fact that the lower frequencies, which at one time were not reproduced very well, have now become attractive as lending power and tone to the reproduction, but it is also due to the demand for increased range in distant reception, for which purpose a high selectivity is required, a virtue which is most easily attained by reducing or eliminating the higher frequencies. Compensation for this latter deficiency can be obtained to some extent by using tone-correcting arrangements in the audiofrequency stages of the receiver, but the effect of these in the sound reproduction is rather handicapped by the poor response of the moving-coil type of loudspeaker to the higher audio-frequencies.
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The Piezo-Electric Loud-Speaker. Nature 133, 184 (1934). https://doi.org/10.1038/133184a0
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DOI: https://doi.org/10.1038/133184a0
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