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A digital audio transmitter system capable of transmitting high quality, wideband speech over a transmission channel with a limited bandwidth such as a traditional telephone line. The digital audio transmitter system includes a coder for coding an input audio signal to a digital signal having a tran

A digital audio transmitter system capable of transmitting high quality, wideband speech over a transmission channel with a limited bandwidth such as a traditional telephone line. The digital audio transmitter system includes a coder for coding an input audio signal to a digital signal having a transmission rate that does not exceed the maximum allowable transmission rate for traditional telephone lines and a decoder for decoding the digital signal to provide an output audio signal with an audio bandwidth of wideband speech. A coder and a decoder may be provided in a single device to allow two-way communication between multiple devices.

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A digital audio transmitter system capable of transmitting high quality, wideband speech over a transmission channel with a limited bandwidth such as a traditional telephone line. The digital audio transmitter system includes a coder for coding an input audio signal to a digital signal having a tran

A digital audio transmitter system capable of transmitting high quality, wideband speech over a transmission channel with a limited bandwidth such as a traditional telephone line. The digital audio transmitter system includes a coder for coding an input audio signal to a digital signal having a transmission rate that does not exceed the maximum allowable transmission rate for traditional telephone lines and a decoder for decoding the digital signal to provide an output audio signal with an audio bandwidth of wideband speech. A coder and a decoder may be provided in a single device to allow two-way communication between multiple devices. rowing a bandwidth of the laser beam to 0.6 pm or less. 7. The laser system of claim 6, wherein the resonator further comprises a beam expander before the phase conjugate mirror for increasing a radius of curvature of a wavefront of the laser beam incident on the phase conjugate mirror. 8. An excimer or molecular fluorine laser system, comprising: a discharge chamber filled with a gas mixture at least including a halogen-containing species and a buffer gas; a plurality of electrodes within the discharge chamber connected to a discharge circuit for energizing the gas mixture; and a resonator including the discharge chamber therein for generating a laser beam, wherein the resonator further includes: an adaptive optical element for making wavefront corrections, said adaptive optical element being selected from the group of adaptive optical elements consisting of a plate with a non-planar refr