Title: Power supply for an audio-video recording system

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Claims: What is claimed is:

1. In a recording system of the type which records composite video and audio television signals onto a recording medium which includes a tuning and intermediate frequency section for receiving and converting transmitted television signals into composite video and audio signals and a recording device for recording the composite video and audio signals and having an input adapted for connection to an AC power source, the improvement of a power supply for activating the tuning and intermediate frequency section and the recording device to enable recording of the composite video and audio signals at preselected times comprising:

a timer having an input adapted for connection to an AC line voltage source, a switch coupled to said input and selectively operable for closing at a preselected time for providing said AC line voltage, and a receptacle coupled to said switch and adapted for receiving the recording device input for supplying the recording device with activating AC line voltage when said switch is closed;

rectifying means also coupled to said switch for converting said AC line voltage to a pulsating DC voltage; and

filtering means coupled to said rectifying means and to the tuning and intermediate frequency sections for providing the tuning and intermediate frequency sections with activating filtered DC voltage when said switch is closed; whereby,

when said switch is closed at said preselected time, the tuning and intermediate frequency sections are activated by said filtered DC voltage derived by said rectifying means and said filtering means from said AC line voltage provided by said timer switch to therby produce the composite video and audio signals, and the recording device is activated for recording the composite video and audio signals by said AC line voltage provided by said timer switch at said receptacle.

2. A system in accordance with claim 1 wherein said rectifying means comprises a diode bridge.

3. A system in accordance with claim 1 further comprising a series regulator coupled between said filtering means and said tuning section for providing said tuning section with a regulated DC voltage when said switch is closed.

4. A system in accordance with claim 3 wherein said series regulator includes means for sensing its output current and means for interrupting said regulated DC voltage when its output current exceeds a predetermined limit.

5. A system in accordance with claim 3 further comprising power indicating means coupled to said voltage regulator for indicating when said regulated DC voltage is being provided to said tuning section.

6. A system in accordance with claim 5 wherein said indicating means is a light emitting diode.

7. A system in accordance with claim 1 wherein said timer includes a timer motor coupled to and powered by said AC line voltage for keeping time.

8. A system in accordance with claim 7 wherein said timer further includes a display coupled to said timer motor for displaying the time being kept by said timer motor.

9. In a recording system of the type which records composite video and audio television signals onto a recording medium which includes a tuning section for receiving transmitted television signals, an intermediate frequency section for converting the received television signals into composite video and audio television signals and a recorder for recording the composite video and audio signals and having a power input adapted for connection to an AC power source, the improvement of a power supply for activating and powering the tuning section, intermediate frequency section and the recorder to enable recording of the transmitted television signals at preselected times comprising:

an input adapted for connection to an AC line voltage source;

a timer motor coupled to said input for keeping time and powered by the AC line voltage;

a switch also coupled to said input and associated with said timer motor for being selectively closed responsive to said timer motor at preselected times;

an AC receptacle coupled to said switch for receiving the AC line voltage when said switch is closed and adapted for receiving the recorder power input;

a diode bridge rectifier also coupled to said switch for providing a pulsating DC voltage derived from the AC line voltage when said switch is closed;

filtering means coupled to said diode bridge rectifier for providing a filtered DC voltage;

a first terminal coupled to said filtering means and to the intermediate frequency section for powering the intermediate frequency section with filtered DC voltage when said switch is closed;

a series regulator also coupled to said filtering means for providing a constant filtered DC voltage when said switch is closed; and

a second terminal coupled to said series regulator and to the tuning section for powering the tuning section with a constant filtered DC voltage when said switch is closed; whereby,

when said switch is closed responsive to said timer motor at said preselected times, said second terminal provides the tuning section with a constant filtered DC voltage to thereby cause the tuning section toreceive the tr transmitted television signals, said first terminal provides the intermediate section with a filtered DC voltage to thereby cause the intermediate section to convert the received transmitted television signals into composite video and audio signals, and said receptacle provides the recorder with AC line voltage to cause the recorder to record the composite video and audio signals.

Other info:

Inventors: Aubert, Richard C. (Chicago, IL, US)
Dean, George R. (Chicago, IL, US)
Ricks, James B. (Evanston, IL, US)
Wade, John W. (Mount Prospect, IL, US)

Application Number: 569346
Filing Date: 1975-04-18
Publication_date: 1976-06-08
Assignee: Bell & Howell Company (Chicago, IL)
Primary Class(es): 348/730 360/69, 369/7, 386/96, 455/343.4
Other Classes:
US Patent Ref:

3611151	Oct, 1971	Fernandez	325/396.
3818352	Jun, 1974	Moran	325/396.
3873921	Mar, 1975	Petrinec	325/396.

Other Refs:
Primary Examiner: Griffin, Robert L.
Assistant Examiner: Psitos, Aristotelis M.
Attorney: Gray; Richard, Fitz-Gerald; Roger M.