JPS58107666U - Dropout correction circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a circuit block diagram showing an example of conventional dropout correction, Figures 2 to 4 are related to the present invention, Figure 2 is its block diagram, Figure 3 is its specific circuit diagram, and Figure 4. 3 is a waveform diagram showing waveforms at points A, B, and C in FIG. 3. 12... Dropout detection circuit, 13...
... Pulse width shortening means, 14 ... Dropout correction section, C section ... Capacitor, R1, R2
, R3...Resistance.

Claims (2)

[Scope of utility model registration request] (1) A dropout detection circuit that detects the width of dropout on a disk where signals are sequentially recorded line by line and outputs a correction pulse, and based on this correction pulse, the dropout occurs in the recorded signal one line before. In a dropout correction circuit consisting of an activated dropout correction section, the dropout detection circuit and the dropout correction section are interposed to detect the width of the correction pulse, and the width is set to a constant width. In the above case, the dropout correction circuit is characterized by comprising a correction pulse width shortening means that shortens the width of the correction pulse to select an operation time of the dropout correction section. (2) The dropout correction circuit according to claim 1, wherein the correction pulse width shortening means is constituted by a differentiating circuit.