Single channel split-sound receiver for use with television set

• US 4,555,730 A
• Filed: 01/24/1983
• Issued: 11/26/1985
• Est. Priority Date: 01/24/1983
• Status: Expired due to Fees

• Current Assignee: Transference International
• Original Assignee: Media Transference International Limited
• Inventors: Briggs, James B.
• Primary Examiner(s): Chin, Tommy P.
• Application Number:
  US06/460,450
• Time in Patent Office: 1,037 Days
• Field of Search: 358/144, 358/142, 358/143, 358/186, 358/189, 358/198
• US Class Current: 348/738
• CPC Class Codes: H04N 5/607 for more than one sound signal, e.g. stereo, multilanguages H04N5/602 takes precedence

Abstract

A simple inexpensive single channel split-sound receiver is provided for use with a conventional television receiver, and which is capable of selectively providing a first language sound and a second language sound for the television programs of a particular television channel received by the television receiver, with the television receiver being used only to reproduce the video portion of the television programs.

Claims

1. A split-sound receiver for reproducing foreign language audio signals accompanying a television signal received on a particular channel of a television receiver, said television receiver radiating a radio frequency signal when the television receiver is tuned to television channel, said television signal including a first sub-carrier modulated in accordance with audio signals representative of a first language and a second sub-carrier modulated in accordance with audio signals representative of a second language, said receiver comprising:

an antenna for receiving the radio frequency signal from the television receiver when the television receiver is tuned to a particular television channel;

band-pass circuit means coupled to said antenna and tuned to said particular television channel to pass only the radio frequency signal associated with said particular television channel;

first detector means coupled to the band-pass circuit means for converting the radio frequency signal passed by said band-pass circuit means into an intermediate frequency signal of a selected intermediate frequency;

circuit means coupled to said first detector means and including a sub-carrier detector circuit responsive to said intermediate frequency signal from said first detector means for detecting said second sub-carrier to recover the second language audio signals;

a speaker; and

output circuit means connecting the output of said sub-carrier detector circuit to said speaker to apply said second language audio signals thereto.

2. The receiver defined in claim 1, in which said circuit means includes further sub-carrier detector means for detecting said first sub-carrier to recover the first language audio signals;

and switching means included in said output circuit means for selectively connecting the speaker to the output of the first-mentioned sub-carrier detector circuit and to the output of said further sub-carrier detector means.