Matsushita Electric Industrial Co., Ltd.

Nippon Hoso' Kyokai

Hisashi Arita

Yuichi Ninomiya

Naoji Okumura

Yoshimichi Ohtsuka

Tadashi Kawashima

Takushi Iwamoto

Kiyoshi Imai

Toshihiro Miyoshi

Ryuji Matsuura

Kenji Ishikawa

Taku Takada

A double-picture type television receiver for displaying two different pictures on its screen. The television receiver is equipped with an image memory having a capacity required for storing a child picture signal to be inputted, the child picture signal to be stored being for one picture and a line memory coupled in series to an output of the image memory. Also included are multipliers, one being directly coupled to the output of the image memory for multiplying the output of the image memory by a predetermined coefficient and the other being coupled to outputs of the line memory for multiplying the outputs of the line memory by a predetermined coefficient. An adder calculates the sum of outputs of the multipliers and outputs the sum signal as a child picture signal. A switching device is responsive to a parent picture signal inputted from an external circuit and further to the output of the adder for performing a switching operation between the parent picture signal and the output of the adder with respect to a display device.

Double-picture type television receiver

A digital audio signal demodulation circuit comprises a synchronous detection circuit (18) and a muting circuit (17) for muting the output from an interpolation circuit (16) using a synchronization lock signal generated from the synchronous detection circuit (18) when synchronization has been lost. The differential signal output from the interpolation circuit (16) is muted by the muting circuit (17) and thereafter integrated by an integration circuit (19). Thus, an audio signal with high sound quality can be demodulated without producing interruption noise even when synchronization has been lost or forcible muting is done.

Audio signal demodulation circuit

Audio signal demodulating circuit with reduced power consumption

Growing community of inventors

Hyogo, Japan

Hisashi Arita