US3714575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Code controlled broadcasting system
Assignee: AMALGAMATED MUSIC ENTERPRISES INC US
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Filing: 1970-08-07
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Granted: 1973-01-30
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Expires: 1990-08-07
Abstract
Abstract A radio broadcasting system includes a transmitter which transmits a program signal such as music on one channel, periodic message signals such as advertising commercials on another channel and a plurality of code signals of different frequencies occuring in time at the beginning of selected ones of the message signals. A plurality of radio receivers each receive the program, message and code signals and include means for audibly reproducing the program and message signals. Each receiver includes first and second filtering means responsive to only the program or message signals, respectively, together with switching means for connecting either of the first and second filtering means in the receiver circuit. Each receiver also includes a control circuit operative in response to the presence of a particular one of the code signals to cause movement of the switching means from one of the filters to the other. The control circuit includes feedback adjusting means in the frequency responsive input portion thereof, a high resistance coupling from input to output, and time delay means associated therewith which together assure that receiver operation is switched from program to message signal reproduction only in response to the particular intended code signal and not in response to other control signals closely spaced in frequency or to transient or spurious signals.
Inventors
- 👤 T Rogalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:27
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/28; H04H20/30; H04H20/31
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
350 words
A radio broadcasting system comprising: a. a transmitter for transmitting a program signal on one channel and periodic message signals on another channel; b. coding means in said transmitter for generating plurality of code signals, each of a different frequency, and corresponding in time to the beginning of selected ones of the message signals; c. a plurality of radio receivers, each of said receivers normally audibly reproducing said program signal and each including means for switching operation to audibly reproduce said message signals and then switching operation thereof to resume reproduction of said program signal; d. control means in each of said receivers operative in response to only a particular predetermined one of said code signals and connected to said switching means for switching operation of said receiver to audibly reproduce said message signal upon the occurrence of said particular one of said code signals, said control means including frequency responsive circuit means tuned to the frequency of said particular code signal and having means for providing a constant voltage at the output of said frequency responsive circuit means in response to the presence of said particular code signal frequency, rectifier means connected to the output of said frequency responsive circuit means, and a high resistance path connecting the output of said rectifier means to transducer means, and e. each of said receivers including first and second speaker means connected to the output thereof and wherein said apparatus includes means responsive to the presence of said message signal and to the operation of said control means for disconnecting one of said first or second speaker means from the output of said receiver for the duration of said message signal. 2. Apparatus according to claim 1 wherein each of said receivers includes a first filter means for passing said program signal and rejecting said message signal, second filter means for passing said message signal and rejecting said program signal, switching means being connected in controlled relation to said control means for placing one of said filter means into operation in said receiver in response to the operation of said control means.
Claim 2
Dependent Claim
350 words
A radio broadcasting system comprising: a. a transmitter for transmitting a program signal on one channel and periodic message signals on another channel; b. coding means in said transmitter for generating plurality of code signals, each of a different frequency, and corresponding in time to the beginning of selected ones of the message signals; c. a plurality of radio receivers, each of said receivers normally audibly reproducing said program signal and each including means for switching operation to audibly reproduce said message signals and then switching operation thereof to resume reproduction of said program signal; d. control means in each of said receivers operative in response to only a particular predetermined one of said code signals and connected to said switching means for switching operation of said receiver to audibly reproduce said message signal upon the occurrence of said particular one of said code signals, said control means including frequency responsive circuit means tuned to the frequency of said particular code signal and having means for providing a constant voltage at the output of said frequency responsive circuit means in response to the presence of said particular code signal frequency, rectifier means connected to the output of said frequency responsive circuit means, and a high resistance path connecting the output of said rectifier means to transducer means, and e. each of said receivers including first and second speaker means connected to the output thereof and wherein said apparatus includes means responsive to the presence of said message signal and to the operation of said control means for disconnecting one of said first or second speaker means from the output of said receiver for the duration of said message signal. 2. Apparatus according to claim 1 wherein each of said receivers includes a first filter means for passing said program signal and rejecting said message signal, second filter means for passing said message signal and rejecting said program signal, switching means being connected in controlled relation to said control means for placing one of said filter means into operation in said receiver in response to the operation of said control means.
Claim 3
Dependent Claim
49 words
Apparatus according to claim 2 wherein said first filter means normally is in operation in said receiver and wherein said switching means removes said first filter means from operation and places said second filter means into operation in said receiver in response to the operation of said control means.
Claim 4
Dependent Claim
58 words
Apparatus according to claim 1 wherein the duration of each of said code signals is relatively much shorter than the duration of said message signals and wherein said control means includes holding circuit means for maintaining operation of said control means in response to the presence of said message signal and for the duration of said message signal.
Claim 5
Dependent Claim
39 words
Apparatus according to claim 1 wherein said control means includes timing means whereby the duration of said code signal must be greater than the time constant of said timing means for operation of said control means to be maintained.
Claim 6
Dependent Claim
275 words
In a radio broadcasting system wherein a transmitter transmits a program signal on one channel, periodic message signals on another channel, and a plurality of code signals of different frequencies and occurring in time at the beginning of selected ones of the message signals, a radio receiver comprising: a. means for detecting the program, message and code signals; b. means for audibly reproducing the program and message signals; c. first filtering means connected to said reproducing means for passing the program signal and rejecting the message signal; d. second filtering means connected to said reproducing means for passing the message signal and rejecting the program signal; e. switching means for connecting either of said first or second filtering means to said detecting means; and f. frequency responsive control circuit means including a resonant circuit having an input and an output and tuned to the frequency of a particular one of said code signals, means for connecting the input of said resonant circuit directly to the output of said receiver detecting means, transducer means having an output operatively connected to said switching means, said control circuit means having means coupling the output of said resonant circuit to said transducer means with a horizontal frequency response at the frequency of said particular code signal so that the signal applied to said control circuit means must correspond in frequency precisely with the frequency to which said resonant circuit is tuned in order to operate said transducer means thereby causing movement of said switching means from said first filtering means to said second filtering means in response to the presence of only said particular one of said code signals.
Claim 7
Dependent Claim
275 words
In a radio broadcasting system wherein a transmitter transmits a program signal on one channel, periodic message signals on another channel, and a plurality of code signals of different frequencies and occurring in time at the beginning of selected ones of the message signals, a radio receiver comprising: a. means for detecting the program, message and code signals; b. means for audibly reproducing the program and message signals; c. first filtering means connected to said reproducing means for passing the program signal and rejecting the message signal; d. second filtering means connected to said reproducing means for passing the message signal and rejecting the program signal; e. switching means for connecting either of said first or second filtering means to said detecting means; and f. frequency responsive control circuit means including a resonant circuit having an input and an output and tuned to the frequency of a particular one of said code signals, means for connecting the input of said resonant circuit directly to the output of said receiver detecting means, transducer means having an output operatively connected to said switching means, said control circuit means having means coupling the output of said resonant circuit to said transducer means with a horizontal frequency response at the frequency of said particular code signal so that the signal applied to said control circuit means must correspond in frequency precisely with the frequency to which said resonant circuit is tuned in order to operate said transducer means thereby causing movement of said switching means from said first filtering means to said second filtering means in response to the presence of only said particular one of said code signals.
Claim 8
Dependent Claim
48 words
A radio receiver according to claim 6 wherein said switching means normally connects the output of said detecting means to the input of said first filter means and is moved to the input of said second filter means in response to the operation of said control circuit means.
Claim 9
Dependent Claim
57 words
A radio receiver according to claim 6 wherein the duration of each of said code signals is relatively much shorter than the duration of said message signals and wherein said control circuit means includes holding circuit means coupled to said reproducing means for maintaining operation of said control circuit means for the duration of said message signal.
Claim 10
Dependent Claim
42 words
A radio receiver according to claim 6 wherein said control circuit means includes timing means whereby the duration of said code signal Must be greater than the time constant of said timing means for operation of said control means to be maintained.
Claim 11
Dependent Claim
62 words
A radio receiver according to claim 6 including first and second speaker means connected to the output thereof and further including means responsive to the presence of said message signal and to the operation of said control circuit means for disconnecting one of said first or second speaker means from the output of said receiver for the duration of said message signal.
Claim 12
Dependent Claim
97 words
A radio receiver according to claim 6 wherein said means coupling the output of said resonant circuit to said transducer means comprises: a. first amplifier means having an input and an output; b. means including a variable capacitor for connecting the output of said resonant circuit to the input of said amplifier; c. rectifier means coupled to the output of said amplifier means; d. second amplifier means having an input and having an output connected to said transducer means; and e. a high resistance path connecting said rectifier means to said input of said second amplifier means.
Claim 13
Dependent Claim
285 words
In a radio broadcasting system wherein a receiver includes first and second transmission means to be in operation during corresponding first and second modes of reception and switching means for connecting the receiver detecting means selectively to either of said transmission means, a control circuit for operating said switching means in response to the reception of a particular code signal, said control circuit comprising: a. a resonant circuit having an input and an output and tuned to the frequency of said particular code signal; b. means connecting the input of said resonant circuit to the output of said receiver detecting means; c. first amplifier means having an input and an output; d. means including a variable capacitor for connecting the output of said resonant circuit to the input of said amplifier; e. rectifier means coupled to the output of said amplifier means; f. second amplifier means having an input and an output; g. a high resistance path connecting said rectifier means to said input of said second amplifier means; h. capacitive timing means connected to the input of said second amplifier means whereby the duration of said code signal must be greater than the time constant of said timing means for operation of said control circuit to be maintained; i. means for coupling said output of said second amplifier means to said switching means whereby the latter is moved in response to operation of said second amplifier means; and j. holding circuit means coupled to one of said first and second transmission means and to the input of said second amplifier means for maintaining operation of said control circuit for the duration of one of said modes of reception upon cessation of said code signal.
Claim 14
Dependent Claim
285 words
In a radio broadcasting system wherein a receiver includes first and second transmission means to be in operation during corresponding first and second modes of reception and switching means for connecting the receiver detecting means selectively to either of said transmission means, a control circuit for operating said switching means in response to the reception of a particular code signal, said control circuit comprising: a. a resonant circuit having an input and an output and tuned to the frequency of said particular code signal; b. means connecting the input of said resonant circuit to the output of said receiver detecting means; c. first amplifier means having an input and an output; d. means including a variable capacitor for connecting the output of said resonant circuit to the input of said amplifier; e. rectifier means coupled to the output of said amplifier means; f. second amplifier means having an input and an output; g. a high resistance path connecting said rectifier means to said input of said second amplifier means; h. capacitive timing means connected to the input of said second amplifier means whereby the duration of said code signal must be greater than the time constant of said timing means for operation of said control circuit to be maintained; i. means for coupling said output of said second amplifier means to said switching means whereby the latter is moved in response to operation of said second amplifier means; and j. holding circuit means coupled to one of said first and second transmission means and to the input of said second amplifier means for maintaining operation of said control circuit for the duration of one of said modes of reception upon cessation of said code signal.
Claim 15
Dependent Claim
37 words
A control circuit according to claim 12 wherein said means connecting the input of said resonant circuit to the output of said detecting means comprises the series combination of first and second diodes connected in opposed relation.
Claim 16
Dependent Claim
67 words
A control circuit according to claim 12 wherein said first amplifier means comprises a triode, wherein said means including said variable capacitor is connected between said resonant circuit and the grid of said triode, and wherein said means further comprises a fixed capacitor connected to said variable capacitor and means connecting the junction of said fixed capacitor and said variable capacitor to the cathode of said triode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |