Radio vision electronic network / analog output / viewing system

Abstract

A system and method bringing video to commercial FM and video to Sub-Carrier Authorization programming, the system would make use of a Double Sideband Suppress Carrier SCA frequency at 67 kHz, modulated by a Slow San Video Converter for providing minute by minute snap shots of video related to the audio program on the main FM channel such as if the main FM channel being listened to is 87.7 MHz then the related video channel would be 87.767 MHz, also, an additional audio/slow scan video FM station would be available as well and will be known as fm2, the audio portion of fm2 is an Independent Sideband Suppressed Carrier for providing audio in stereo at the SCA frequency at 92 kHz and the slow scan video portion of the station is again another Double Sideband Suppress Carrier SCA at the frequency of 114 kHz.

Description

A system and method to bring video to commercial FM and video to Subcarrier Authorization programming as well.

The system would make use of a Double Sideband Suppress Carrier SCA frequency at 67 kHz modulated by a Slow San Video Converter for providing minute by minute snap shots of video related to the audio program on the main FM channel such as if the main FM channel being listened to is 87.7 MHz then the related video channel would be 87.767 MHz

In addition to that an additional audio/slow scan video FM station would be available as well and would be known as fm2.

The audio portion of fm2 is an Independent Sideband Suppressed Carrier for providing audio in stereo at the SCA frequency at 92 kHz and the Slow Scan Video portion of the station is again another Double Sideband Suppress Carrier SCA at the frequency of 114 kHz, which is obtain by a modification to the presently used transmitter, making use of a Frequency Doubler and tapping off the 57 kHz RDS frequency and inputting that frequency into the input of the Frequency Doubler thus obtaining the desired output of 114 kHz.

By making the main FM radio station at 87.7 MHz thus causing the subcarrier fm2 radio station audio in stereo or not to be at 87.792 MHz and its Slow Scan Video portion at 87.814 MHz

The Radiovision receiver will tune in each FM station's audio/video simultaneously with one button dial tuning and has a mode switch labeled FM/fm2 for separate listening and viewing of the two FM radio stations within the 200 kHz bandwidth per channel on the commercial FM band comprising of 87.7 MHz to 107.9 MHz.

Broadcast equipment used for this project/invention were: A

NiCom_NT-30 FM transmitter with left and right channel STEREO inputs, 67 kHz and 92 kHz INDEPENDENT SCA inputs.

RDS generator and frequency doubler, an ISB adapter originally built by W7FEN for the Drake TR-4C transceiver, and the Kenwood VC-H1 with auto switch.

Receiving equipment used for this project/invention were: A

RCA 2764 mini component set for receiving regulator FM stereo broadcast,

a MetroSonix MS-3390 for receiving FM broadcast on the commercial FM band of 87.5 MHz to 107.9 MHz, as well as the 67 kHz SCA and the 92 kHz SCA per FM channel, and the Kenwood VC-H1 with auto switch.

100_DVD player.

101_antenna input coil connector.

102_OR gate FM stereo/RDS transmitter with a bandwidth of 58.65 kHz.

103_color SSTV converter.

104_auto power switch

105 _—87.7 MHz main oscillator.

106 _—67 kHz subcarrier (dsb-sc video) modulator for main FM channel.

107_Diplexer.

108_RF Amplifier.

109_Antenna Tuner.

110_Antenna.

111_Subcarrier summing amp/mixer/frequency division multiplexer.

112_auto switch #2

113_fm2 color SSTV convertor.

114_.fm2-114 kHz subcarrier (dsb-sc video) modulator.

115_DVD player.

116_fm2-92kHz subcarrier (isb-sc audio) modulator.

200_Antenna.

201_FM receiver.

203_RDS matrix and band pass filter, 1.65 kHz wide (57 kHz to 58.65 kHz) for main FM channel.

204_LCD video screen.

205_FM/fm2 mode switch.

206_Slow Scan TV converter.

207 _—92 kHz band pass filter, 10 kHz wide (87 kHz to 97 kHz).

208 _—114 kHz band pass filter, 4 kHz wide (112 kHz to 116 kHz).

209_lower sideband low pass filter =left channel.

210_=upper sideband high pass filter right channel.

211_and 221_ISB-SC Stereo Matrix.

212 _—67 kHz band pass filter, 18 kHz wide (58.65 kHz to 76.65 kHz).

213 _—0 Hz to 53 kHz band pass filter.

214 _Q and 217_not Q, =FM stereo detector.

215_Right channel audio amplifier.

216_Right channel output speaker.

218_Left channel audio amplifier.

219_Left channel output speaker.

220_Stereo sensor matrix and pilot light @19 kHz in 38 kHz out for main FM channel.

222 _—92 kHz oscillator for ISB-SC audio in stereo for fm2.

223_Double sidebands-suppressed carrier SCA demodulator for slow scan video.

A BRIEF DESCRIPTION OF THE DRAWING FIG. 1

Is the overall Radio Vision FM/fm2 stereo transmitter system, a signal source such as a microphone and a video camera, or in this case a DVD player (100) as the stereo audio signal source in the left and right channel input of the main channel of the test transmitter (102) operating on a frequency of 87.7 MHz,

The video source of the DVD player (100) is passed through a Slow Scan TV Converter (103), into the input of the 67 kHz SCA (106) portion of the test transmitter, the two signals are then passed through a diplexer (107), followed by the RF amplifier (108) and an antenna tuner (109) prior to being feed into the broadcast antenna (110).

In addition to that, the fm2 portion of the test transmitter makes use of two additional SCA's, the 92 kHz SCA (116) for the audio from the second DVD player (115) in use, as well it's video that passes through the second SSTV Converter (113), before reaching the 114 kHz SCA (114).

A BRIEF DESCRIPTION OF THE DRAWING FIG. 1

All three SCA output signals are all summed up into a summing amplifier (111) before reaching the diplexer (107) mention earlier.

The operating frequency is set by the Phase Lock Loop circuit (105) and can be set anywhere between 87.5 MHz to 108.1 MHz

The auto switches (104 and 112) enable the SSTV converters (103 and 113) to transmit color still life pictures one per minute over the commercial FM band.

A BRIEF DESCRIPTION OF THE DRAWING FIG. 2

Is the compatable receiver for the Radio Vision FM/fm2 stereo transmitter.

The fm stereo signal for the main FM channel is obtained in the usual manor as with any FM/RDS stereo receiver used in North America, all signals are filtered off from the broadband (201) of the receiver, the 30 Hz/53 kHz band pass filter (213) passes the audio for the main channel, that feeds the stereo comprising system L+R (214, 215 and 216) and L−R (217,218,219 and 220).

The 67 kHz band pass filter (212) passes the video signal related to the main FM channel to the video amplifier (223) then on to the SSTV converter (206) which converts the signals into color still life pictures, one per minute, shown on the color LCD screen (204).

An FM/fm2 switch (205) enables the audio and video signals of fm2 to be engaged.

A BRIEF DESCRIPTION OF THE DRAWING FIG. 2

The video signal of fm2 passes through the 114 kHz filter (208) onto the video amplifier (223), SSTV converter (206) finalizing at the color LCD screen (204)

The audio portion of the fm2 signal passes through the 92 kHz filter (207) then continues on to an Independent Sideband system (211 and 221) to achieve stereo audio at the output speakers.

A BRIEF DESCRIPTION OF THE DRAWING FIG. 3

Comprising of the main fm channel L+R frequencies of 30 Hz to 15 kHz modulated at a 100% with plus or minus tolerances factored in and the L−R stereo frequencies of 23 kHz to 53 kHz at a modulation factor of 85% of the double sideband suppressed carrier (213)

Frequency location of the 19 kHz stereo pilot at 10% modulation (220)

The Radio Data Service (RDS) spectrum of 57 kHz at a modulation index of 05% (203)

The 67 kHz Subcarrier Authorization represents the location of the Slow Scan TV video1 for the main FM channel at no more than 10% modulation (212)

The 92 kHz Independent Sidebands Suppress Carrier SCA modulated as well at no more than 10%, is the audio in stereo for the fm2 sub channel (207)

And the 114 kHz SCA is the Slow Scan TV video2 for the fm2 sub channel also modulated at no more than 10% modulation (208)

A BRIEF DESCRIPTION OF THE DRAWING FIG. 4

Is the Independent Sideband system used to receive compatible stereo for the fm2 portion of the Radio Vision FM/fm2 stereo receivers.

Only the signals 86 kHz to 98 kHz will pass this band pass filter (207) into two double sideband suppressed carrier balanced modulators (211 and 221).

A Low Pass Filter (209) passes only frequencies; 91 kHz down to 86 kHz, for the left channel audio output, and a High Pass Filter (210) will pass frequencies; 93 kHz up to 98 kHz for the right channel audio output.

The phase lock loop circuit (222) sets the center frequency (suppressed carrier) for the ISB stereo detector at 92 kHz.

Claims

1-3. (canceled)

4. A method for broadcasting audio and slow scan TV signals simultaneously from the same FM broadcast station, comprising: FM broadcast station is transmitting the audio and slow scan TV signals at the same time over the air, wherein the audio and slow scan TV signals to be transmitted over the same 200 KHz wide channel on the FM band of 87.7 MHz through 107.9 MHz within the bandwidth that is allowed by the Federal Communication Commission that regulates broadcast communications, wherein for FM Video at the 67 kHz subcarrier authorization for the traditional commercial FM audio broadcast, and FM Video at the 114 kHz subcarrier authorization for the addition FM audio broadcast at 92 kHz subcarrier authorization within the 200 kHz bandwidth of said FM channel.