An automatic equalizer has a transversal filter circuit for equalizing an input signal to be equalized and providing an equalized output according to the value of tap coefficients thereof. The transversal filter circuit includes a low-pass filter (LPF) at its output stage. The equalized output is subjected to a phase shift by the LPF. The equalized output is applied to a sign circuit as well as a wave integration circuit. The sign circuit generates a sign signal indicating a rate of change of th...

A transversal equalizer has a transversal filter which performs a convolution of an unequalized signal and a tap weight. In the automatic equalization mode, the tap weight is updated according to the result of a correlation of the unequalized signal and an error signal, and the updated tap weight is applied to the transversal filter. In the fixed equalization mode, a fixed tap weight stored in a memory is applied to the transversal filter.

In a digital system, especially where PCM coded speech is conveyed over twisted pair cables optimized for analogue speech, a pulse is received distorted, the distortion being especially bad on the trailing edge of the pulse. This decays slowly enough to cause intersymbol interference with the next pulse. This is overcome by applying the signal from an amplifier (11), FIG. 4, to one input of a subtractor (12) via a delay and attenuation circuit (13-15) and to the other input of the subtractor dir...

A small-sized LSI variable equalizer is provided for accurately equalizing waveforms of signals transmitted via transmission lines of different distances. Variable equalizer units capable of stepwise changing the equalizing characteristics thereof are connected in series with each other with the variable equalizer units having variable step widths different from each other. An output signal of the variable equalizer units is compared with a reference signal to convert the comparison output signa...

An equalizer apparatus for audio equipment capable of selecting between a 2-speaker system and a 4-speaker system, including a display device indicating proper operation of the control knobs of the equalizer. The display device includes a first illuminable element of a first color for indicating operation of one channel of stereophonic sound reproduction, a second illuminable element of a second color for indicating operation of the other channel of stereophonically reproduced sound, and color c...

A clamping device which has a plurality of elongated clamping members joined to a clamp main frame by a pair of slideable side plates which allow the separate clamping members to be moved axially relative to each other and to the clamp main frame so that the clamping members can be adjusted to compensate for irregularities in those workpieces to be clamped that require coaction of two or more clamping members. The slideable side plates are fixed to the clamp main frame and connected to the clamp...

An improved Kalman equalizer for providing a tap weight of a transversal filter for equalizing a transmission line has been found. A complex number fast Kalman equalizer (FIG. 27), which is the improvement of the prior fast real number Kalman equalizer (see; "Fast calculation of gain matrices for recursive estimation schemes" by Lennart Ljung, et al, INT. J. Control, 1978, vol. 27, No. 1, 1-19), has a complex conjugate generator (C.sub.2) for processing a complex input signal so that an equaliza...

An automatic equalizer includes two wave memories. These wave memories jointly constitute a wave integration memory for storing amplitude information of an input signal. The wave form of input signal to be equalized is divided into fragments along time base, and the amplitude components (analog) of respective fragments are sequentially converted to digital forms in a manner that these fragmentary digital components are alternatively distributed to respective wave memories. For instance, the digi...

An adaptive equalizer for adaptively equalizing a signal received over a channel on which intersymbol interference occurs. The adaptive equalizer accurately updates the tap coefficients of a transversal filter incorporated therein in a predetermined period of time without fail with no regard to the intersymbol interference on the channel.

An automatic equalizer for use with a recording and/or reproducing apparatus or with a communication transmission channel, wherein equalizer parameters are rendered variable and the degree of change of the error rate is extracted to set the parameters to optimum values based on the degree of change of the error rate. Output signal error rates are sequentially detected at a plurality of measurement points corresponding to preset plural characteristic parameters to find a minimum error rate measur...