Four channel decoder with improved gain control专利检索-增强现实显示技术专利检索查询-专利查询网

Four channel decoder with improved gain control

阅读：76发布：2023-11-20

专利汇可以提供Four channel decoder with improved gain control专利检索，专利查询，专利分析的服务。并且Apparatus including a matrix for decoding four separate channels of information transduced from a medium having only two separate tracks and presenting it on four loudspeakers to give the listener the illusion of sound coming from a corresponding number of separate sources. Side-effect or transferred signals between channels tend to diminish the realism of four-channel reproduction. The realism is enhanced by a decoding system which accepts the two outputs from the medium, which, for example, may be a stereophonic disc record, separates them into four independent channels each carrying predominantly the information contained in one of the four original recorded sound signals, and, utilizing logic circuit techniques derives control signals for controlling the gains of amplifiers associated with the four loudspeakers. The control circuitry improves the separation of the four independent channels, particularly the generally ''''front'''' from the generally ''''back'''' signals. To prevent the transferred back signals corresponding to a ''''center front'''' signal from being heard instantaneously in the back channels (and vice versa) a selective gating voltage is applied to the control circuitry which reduces the quiescent gain of the amplifiers during silence or very low level passages by a pre-selected amount, whereby upon sudden application of a signal to the decoder the gain of the amplifier carrying the desired signal is raised rapidly to a normal operating level only in those channels intended to carry the signal and thus the undesired side-effect signals are essentially eliminated.，下面是Four channel decoder with improved gain control专利的具体信息内容。

权利要求

1. Signal-decoding apparatus comprising, in combination: a decoder matrix for translating first and second composite signals respectively containing dominant left front (Lf) and right front (Rf) signal components and each including subdominant left back (Lb) and right back (Rb) signal components, said signal components Lb and Rb in said first composite signal being in substantially quadrature relationship with the corresponding signal components in said second composite signal, into first, second, third and fourth separate output signals respectively predominantly containing the Lf, Rf, Lb and Rb signal components, the dominant Lf and Rf signal components at the output of the decoding matrix each being accompanied by lower-amplitude quadrature-related Lb and Rb signal components and the dominant Lb and Rb signal components each being accompanied by lower-amplitude quadrature-related Lf and Rf signal components; first, second, third and fourth gain-control amplifiers respectively connected to receive the said first, second, third and fourth output signals from said decoder matrix, each of said amplifiers being normally operative at a gain factor less than the maximum gain of the amplifier and having a time constant such that it responds more rapidly to application of a gain-increasing control signal than to a gain-decreasing control signal; a logic circuit connected to said decoder matrix and operative to determine whether a front or back signal is instantaneously predominant in the first and second composite signals and connected to apply a gain-increasing control signal to the first and second gain control amplifiers when a front signal is instantaneously predominant or to the third and fourth gain control amplifiers when a back signal is instantaneously predominant to increase their gains above the said normal gain factor; and circuit means including a source of potential operative when the amplitudes of said first and second composite signals are below a predetermined level to reduce the gains of the gain-control amplifiers below the said normal gain factor.

2. Apparatus in accordance with claim 1, including means for deriving from the first and second composite signals a control voltage having a first substantially constant amplitude, regardless of changes of level in the first and second composite signals, over a predetermined range of levels of the composite signals, and to produce a control voltage of a second lower amplitude over a range of levels of the composite signals below the predetermined range of levels, and wherein the means for reducing the gains of the gain-control amplifiers includes a source of potential opposite in polarity to the said control voltage and substantially of the said first amplitude and so connected as to oppose and substantially cancel the said control voltage when the latter has the said first amplitude and applying a resultant gain-decreasing voltage to the four gain-control amplifiers when the said control voltage is of the said lower amplitude.

3. Apparatus in accordance with claim 2, wherein the means for deriving the said control voltage includes first and second auxiliary gain-control amplifiers, a pair of signal-combining networks each connected to receive output signals from the first and second auxiliary gain-control amplifiers and respectively operative to produce sum and difference signals, means for rectifying the signals from the auxiliary gain control amplifiers and the said sum and difference signals, and means for combining the output signals from said rectifiers to produce said control voltage.

4. Apparatus in accordance with claim 3, wherein said logic circuit is connected to receive as input signals the outputs of said auxiliary gain control amplifiers and the said sum and difference signals from said signal-combining circuits and is operative to compare these signals.

5. Apparatus in accordance with claim 2 wherein the gain factor of said gain control amplifiers is reduced from its normal value by approximately 6db in response to the application thereto of the said gain-decreasing voltage.

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Four channel decoder with improved gain control

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