Abstract: A wireless microphone is provided with a recharging circuit which determines if a battery in the microphone is a rechargeable type and can be safely recharged. The recharging circuitry in the microphone, which could also be included in other handheld wireless devices, determines if a battery is in a charged state where it is difficult to distinguish rechargeable and non-rechargeable batteries. If so the battery is discharged until the battery reaches a charged state where non-rechargeable batteries can be readily distinguished from rechargeable batteries.

Abstract: An emulation circuit includes a digital signal processor with a digital filter controlled by frequency response conversion parameters for converting a standard microphone signal into a signal emulating the frequency response of one of a plurality of microphones selected by a selector connected to the digital signal processor. Optionally the conversion parameters can also include phase response conversion parameters. The emulation circuit can be included in a receiver for a wireless microphone or in a microphone itself.

Abstract: A holder for a wireless microphone includes a pair of terminals electrically connected to a power supply and mounted in a recess of a holder member for engaging corresponding terminals on an elongated handle body of the wireless microphone. In one embodiment, the holder includes an axially offset opening, a rib, a groove or other orienting provision form mating with a corresponding axially offset protrusion, a groove, a rib or other mating orienting provision on the microphone handle body to ensure engagement of the microphone terminals with the holder terminals. In another embodiment, first terminals of the microphone and holder terminals are axially centered and second terminals of the microphone and holder terminals are offset from the axis with one of the second terminals being annular.

Abstract: The magnitude of analog audio input signal to an analog to digital converter in a digital audio processing system is increased or decreased in response to the magnitude of a sample of the digitized audio signal being found below or above, respectively, an acceptable range of magnitudes of the analog audio input signal. The magnitude of an audio output signal is correspondingly decreased or increased, after a delay equal to the processing delay. Additionally the increase of the magnitude of the audio input signal is delayed by a predetermined period, e.g., five to thirty seconds, during which the magnitude of the audio input signal remains below the acceptable input magnitude range.

Abstract: A metal musical string having a plastic or polymer material covering an end of the string opposite to a ball end of the string is contained in a flexible enclosure or pouch. In a coiled configuration, the ends of the string are twisted around convolutions of the coil to maintain the coil configuration. Different colors of polymer material cover ends of respective different music strings to identify the strings contained in the single pouch. The polymer material is either thin to allow insertion through holes or slots of musical instruments or removable. The flexible enclosure is a sealed gas impervious pouch filled with a non-corrosive gas such as nitrogen, carbon dioxide, argon, helium, etc.