United States Patent  [ii] Patent Number: 4,580,174
Tokunaka  Date of Patent: Apr. 1,1986
 APPARATUS FOR RECORDING AND/OR REPRODUCING VIDEO AND AUDIO SIGNALS
 Inventor: Junzo Tokunaka, Yokohama, Japan
 Assignee: Sony Corporation, Tokyo, Japan
 Appl. No.: 553,195
 Filed: Nov. 18, 1983
 Foreign Application Priority Data
Nov. 19, 1982 [JP] Japan 57-204384
Nov. 27, 1982 [JP] Japan J 57-208166
 Int. CI* H04N 5/782
 U.S. CI : 358/328; 358/330;
 Field of Search 358/327, 328, 329, 330;
 References Cited
U.S. PATENT DOCUMENTS
4,509,083 4/1985 Nakano 360/19.1
Primary Examiner—Donald McElheny, Jr.
Attorney, Agent, or Firm—Alvin Sinderbrand; Lewis H.
A video and audio signal recording apparatus includes a first frequency modulator in which a first audio signal to be recorded that may represent a stereophonic left channel modulates a first carrier to produce a first FM audio signal, and a first frequency convenor converts the carrier frequency of the first FM audio signal to a different carrier frequency higher than the first carrier frequency to form a second FM audio signal. A second frequency modulator modulates a second audio signal to be recorded that may represent a stereophonic right channel to produce a third FM audio signal, and a second frequency converter converts the third FM audio signal into a fourth FM audio signal having a carrier frequency that is higher than any of the other FM audio signals so modulated. The first and third FM audio signals are mixed to form a first mixed audio signal and the second and fourth FM audio signals are mixed to form a second mixed audio signal, which are both combined in a mixing circuit with a composite color video signal to form first and second mixed audio and video signals which are fed to first and second magnetic recording heads, respectively. Reproducing apparatus reproduces the recorded signal.
16 Claims, 23 Drawing Figures