Ultrasonic television remote control system
First Claim
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1. An ultrasonic remote control system comprising:
- (a) means for receiving a pulse modulated continuous wave ultrasonic signal at a first predetermined frequency, each pulse being immediately followed by a continuous wave ultrasonic signal at a second predetermined frequency which has amplitude such as to mask echoes of the first predetermined frequency at the receiving means, the pulses being representative of transmitted data,(b) means to determine whether the received signal is above or below the frequency of a reference frequency,(c) means for recognizing a change in input frequency with respect to the reference frequency,(d) means for counting said changes, determining the values of the data represented and providing a parallel coded representative of said value,(e) in which said pulses comprise the data signal,(f) counting means for determining the data represented by the pulses of the data signal and for providing a coded address signal representative of the values of the data represented by said pulses,(g) means for generating clock pulses upon the reception of the data signal and for applying the clock pulses to the counting means for operating the counting means at particular times, and(h) means for enabling the counting means upon the reception of data.
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Abstract
A binary coded signal represented by sequential transmission of two frequencies, comprising means to determine if the frequency of the received signal is below or above a reference frequency generated within the receiver, means for recognizing a change in input frequency relative to the reference as start and end of bit intervals, means to establish if individual bits are of a "one" or "zero" level, means for converting the serial bits to a parallel digital word and means for storing this word indefinitely in the event the received data is a valid signal.
25 Citations
25 Claims
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1. An ultrasonic remote control system comprising:
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(a) means for receiving a pulse modulated continuous wave ultrasonic signal at a first predetermined frequency, each pulse being immediately followed by a continuous wave ultrasonic signal at a second predetermined frequency which has amplitude such as to mask echoes of the first predetermined frequency at the receiving means, the pulses being representative of transmitted data, (b) means to determine whether the received signal is above or below the frequency of a reference frequency, (c) means for recognizing a change in input frequency with respect to the reference frequency, (d) means for counting said changes, determining the values of the data represented and providing a parallel coded representative of said value, (e) in which said pulses comprise the data signal, (f) counting means for determining the data represented by the pulses of the data signal and for providing a coded address signal representative of the values of the data represented by said pulses, (g) means for generating clock pulses upon the reception of the data signal and for applying the clock pulses to the counting means for operating the counting means at particular times, and (h) means for enabling the counting means upon the reception of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A remote control system, including means for receiving a signal representing at least one digit, each digit being represented by a series of binary bits, each bit being represented by a series of two frequencies, a "0" being represented by a first predetermined frequency immediately followed by a second predetermined frequency and a "1" being represented by the second frequency immediately followed by the first;
- means for converting the bits of the signal into data pulses, register means for registering the data pulses, means for checking the data pulses for period and spacing and for resetting the register means in the case of error in said period and spacing, means for clocking the register means at a time derived from the data pulses for proper registration of the data pulses, and storage means connected to the output of the register means for storing an output signal represented by said digit.
- View Dependent Claims (11, 12, 13, 14)
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15. An ultrasonic remote control system for a television receiver, including means for receiving a series of two sequences of said ultrasonic signal representing a series of two binary coded numbers, comprising:
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(a) means for receiving a pulse modulated continuous wave ultrasonic signal at a first predetermined frequency, each pulse being immediately followed by a continuous wave ultrasonic signal at a second predetermined frequency which has amplitude such as to mask echoes of the first predetermined frequency at the receiving means, the pulses being representative of transmitted data, (b) means to determine whether the received signal is above or below the frquency of a reference frequency, (c) means for recognizing a change in input frequency with respect to the reference frequency, (d) means for counting said changes, determining the values of the data represented, and providing a parallel coded signal representative of said value including a counter or shift register, (e) further including means connected to the output of said counter or shift register for distinguishing between the first and second number, and for causing storage of the address represented by the first number in a first storage means and of the address represented by the second number in a second storage means, said numbers identifying a television channel to be selected. - View Dependent Claims (16, 17, 18, 19, 25)
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20. A remote control system comprising:
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(a) means for receiving a pulse modulated continuous wave signal at a first predetermined frequency, each pulse being immediately followed by a continuous wave signal at a second predetermined frequency which has amplitude such as to mask echoes of the first predetermined frequency at the receiving means, the pulses being representative of transmitted data and comprise the data signal, (b) means to determine whether the received signal is above or below the frequency of a reference frequency, (c) means for recognizing a change in input frequency with respect to the reference frequency, and (d) counting means for determining the data represented by the pulses of data signal and for providing a coded address signal representative of the values of the data represented by said pulses, means for generating clock pulses from the data signal and for applying the clock pulses to the counting means for operating the counting means at particular times, and means for enabling the counting means upon the reception of data. - View Dependent Claims (21, 22, 23)
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24. A remote control system comprising:
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(a) means for receiving a sequence of pulses representative of transmitted data, (b) counting means for counting the pulses and providing a parallel coded address signal representative of the values of the data represented by said pulses, means for generating clock pulses from the data signal and for applying the clock pulses to the counting means for operating the counting means at particular times, and means for enabling the counting means upon the reception of data.
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Specification