Wireless local transmission of audio data has become very popular in recent years. Wireless transmission eliminates the need for wires which are annoying and limiting. A variety of wireless stereo speaker systems are now commercially available. A number of systems have been developed to avoid wiring stereo speakers directly to the source of signals used to drive the speakers, such as phonographs, tape decks, CD players, or AM/FM tuners. Wireless speaker systems may be moved about within a room to obtain optimum performance or, alternatively, may be moved from room-to-room or even from house to house with minimal inconvenience. Local wireless transmission is used in portable home telephone systems, stereo systems, home theater systems, and sound surround systems. Wireless speakers allow the listener to move from room to room without the distraction or nuisance of a cord. Wireless speakers also transmit some functional instructions to the stereo system. Wireless headphones may be used outside the home in conjunction with portable music players, for example while jogging. Wireless speaker systems use a variety of either analog transmission techniques or digital transmission techniques to communicate audio signals wirelessly from a transmitter to a receiver.

Wireless audio systems generally include an audio source such as a tuner transmitting a signal to one or more wireless speakers or headphones, wherein the signal carries a single stereo channel of audio data. In wireless audio systems, the signals are transmitted over the air via electromagnetic waves such as radio waves. Wireless headphones or speakers receive musical signals transmitted directly from home stereo systems or portable music players. These headphones or speakers receive signals over prescribed electromagnetic bands. This type of system requires the use of a transmitter for transmitting the signals, a receiver for receiving the signals at the speaker, and a power amplifier for amplifying the signals at the speakers to properly drive the speakers. Audio quality of a speaker is determined by its frequency response over the audible frequency range. Portable or cordless telephones transmit and receive digitized audio signals between a base station and a portable remote handset. Manufacturers of speakers normally provide a specified frequency response of a speaker when it is used in a free-field environment. To select a different channel of audio data, the user must operate the tuner to transmit the desired channel.

Wireless headphones and wireless speakers are commonly used for audio entertainment or television systems. In portable or cordless telephones, the system transmits from the base station on one channel or frequency and the handset or remote station transmits on a separate channel or frequency. This is commonly referred to as full duplex operation. The wireless speakers normally do not have any transmission capability and only receive the transmissions from the audio entertainment systems. Control of audio entertainment systems often occur with a separate remote control of the type that uses infrared communications unrelated to the transmission for the headphone or speaker. This type of communication is commonly referred to as simplex communication. Wireless transceivers are in wide use today in various forms including cordless and cellular telephones and other similarly configured portable units. A handheld portable electronic device employs a speaker to convert electrical signals into sound waves in the human-audible frequency range of 20 Hertz (Hz) to 20 kilohertz (kHz). The speaker enables a user of the radiotelephone to hear a representation of a caller's voice, as well as other sounds such as dial tones.