Abstract: Provided is a speaker apparatus including a first speaker having a first surface communicating with an interior and a second surface not communicating with the interior; a second speaker having a first surface communicating with an exterior and a second surface not communicating with the exterior; and a cabinet having boundary surfaces that form an enclosed space. The second surface of the first speaker and the second surface of the second speaker are arranged on the boundary surfaces and are facing the enclosed space.

Abstract: Provided is a speaker apparatus including a first speaker having a first surface communicating with an interior and a second surface not communicating with the interior; a second speaker having a first surface communicating with an exterior and a second surface not communicating with the exterior; and a cabinet having boundary surfaces that form an enclosed space. The second surface of the first speaker and the second surface of the second speaker are arranged on the boundary surfaces and are facing the enclosed space.

Abstract: A signal processing apparatus includes: a digital processing unit to which a digital input signal is supplied, which performs a digital process on the digital input signal to produce a digital signal, and which produces a control signal designating a specific time period when an amplitude of an analog output signal is to be lowered; a DA-conversion unit which converts the digital signal to produce an analog signal; and a variable gain unit which adjusts an amplitude of the analog signal to produce the analog output signal, and which lowers the amplitude of the analog output signal during the specific time period designated by the control signal.

Abstract: A signal processing apparatus includes: a digital processing unit to which a digital input signal is supplied, which performs a digital process on the digital input signal to produce a digital signal, and which produces a control signal designating a specific time period when an amplitude of an analog output signal is to be lowered; a DA-conversion unit which converts the digital signal to produce an analog signal; and a variable gain unit which adjusts an amplitude of the analog signal to produce the analog output signal, and which lowers the amplitude of the analog output signal during the specific time period designated by the control signal.

Abstract: Compressed waveform samples are read out from a memory on the basis of progressive phase information corresponding to a tone pitch. Readout controller controls the readout so as to provide successive compressed waveform samples from the one corresponding to the phase information of a last sampling cycle to the one corresponding to the phase information of a current sampling cycle. Thus, irrespective of the pitch, all the samples existing between the last sampling cycle and the current sampling cycle are read out. Each of the readout samples is decoded and the thus-decoded sample is used as a prediction value for decoding the following sample, so that all the successive compressed waveform samples can be decoded. As the actual sample corresponding to the current sampling cycle, a necessary sample corresponding to the current phase information is selected from among the decoded samples. Loop reproduction is performed by repeating the advance of the phase information between loop start and end locations.