1. — an audio frequency amplifier unit, comprising at least an audio frequency amplifier and a sound generator,

2. an audio frequency amplifier unit, comprising at least an audio frequency amplifier and a sound generator,

3. These tubes are usually used for power amplification, especially at audio-frequency.

4. The invention relates to audio-frequency power amplifiers operating together with acoustic systems.

5. Method for sharing fm audio frequency during voice communication and mobile communication terminal

6. Audio frequency ripple control transmitter with a pulsed a.c. Rectifier provided with a capacitive accumulator

7. Data receiving error reduction system and method in audio frequency band sound communication, and device applied thereto

8. An audio frequency signal is quantified in a CELP-type encoder or the like using perceptual weighting.

9. Electric transformers, audio-frequency transformers, current transformers, distribution transformers, step up transformers, step down transformers, welding transformers

10. For example, filtering of audio frequency response in the design of loudspeaker cabinets can be achieved with mechanical components.

11. Microphones and stands therefor; loudspeakers, whether or not mounted in their enclosures; audio-frequency electric amplifiers; electric sound amplifier sets

12. Microphones and stands therefore; loudspeakers, whether or not mounted in their enclosures; audio-frequency electric amplifiers; electric sound amplifier sets

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14. Audio signal, an electrical representation of sound; Audio frequency, a frequency in the audio spectrum; Digital audio, representation of sound in a form processed and/or stored by computers or digital electronics; Audio, audible content (media) in audio production and publishing; Semantic audio, extraction of symbols or meaning from audio; Stereophonic audio, method of sound

15. This is accomplished such that the radio frequency message is converted within the transmission path at one part (3b, 3a) of a repeater into a message of audio frequency type, which is converted into a message of radio frequency type at a second part (3a, 3b) of the repeater, whereby the mobile phone (5) is capable to receive the same.