Abstract
About 110 years ago Otto Nussbaumer was able to broadcast wireless tone-faithful sounds of certain musical instruments by using a spark-gap transmitter and the so-called singing-arc for his experiments. The circuit arrangements he used are proven to be the first published in this field.
The nature of the transmitted signals could be elucidated only recently. Thereby the spark-gap of the transmitter turned out as the component of the transmitter which sets an upper limit to the audio-frequency band. Further investigations have shown that by replacing the spark-gap of the transmitter with a particularly headed avalanche-transistor the transmission of human speech is possible as well. With density modulation of the transferred HF-pulses one even receives rendition qualities which are comparable to radiobroadcasting.
The nature of the transmitted signals could be elucidated only recently. Thereby the spark-gap of the transmitter turned out as the component of the transmitter which sets an upper limit to the audio-frequency band. Further investigations have shown that by replacing the spark-gap of the transmitter with a particularly headed avalanche-transistor the transmission of human speech is possible as well. With density modulation of the transferred HF-pulses one even receives rendition qualities which are comparable to radiobroadcasting.
| Translated title of the contribution | The experiments of Otto Nussbaumer |
|---|---|
| Original language | German |
| Pages (from-to) | 63-68 |
| Journal | Elektrotechnik und Informationstechnik |
| Volume | 131 |
| Issue number | 1/2 |
| DOIs | |
| Publication status | Published - 2014 |
Fields of Expertise
- Sonstiges
Treatment code (Nähere Zuordnung)
- Basic - Fundamental (Grundlagenforschung)
- Experimental