Apparatus and method for receiving audio signals transmitted as part of a television video signal

Claim 1

Apparatus for recovering a secondary signal which has been previously encoded on a video signal which encoding utilizes a modulated signal responsive to said secondary signal which modulated signal was combined with said video signal without increasing the bandwith required by said video signal or causing substantial amount of synchronizing information to be deleted from said video signal, including in combination separator means responsive to said video signal to determine the points on said video signal from which said modulated signal may be recovered in response to a clocking signal phase locked to said video and demodulator means responsive to said separator means and said modulated signal to recover said secondary signal.

Claim 14

The method of decoding an audio frequency signal which was previously encoded in the blanking interval of a television video signal which video signal is passed through or stored on standard video equipment, including a step of sampling said encoded audio frequency signal on said video signal at predetermined locations in the blanking interval thereof said locations determined in response to sync pulses of said video signal, a step of temporarily storing said samples in a memory, a step of outputting said samples from said memory at a steady rate and a further step of removing encoding related components from said output samples thus recovering said audio frequency signal.

Claim 15

The method of decoding an audio frequency signal which was previously encoded in the blanking interval of a television video signal which video signal is passed through or stored on standard video equipment, including a step of sampling said encoded audio frequency signal on said video signal at predetermined locations in the blanking interval thereof said locations determined in response to sync pulses of said video signal, a step of temporarily storing said samples in a memory, a step of outputting said samples from said memory at a steady rate and a further step of removing encoding related components from said output samples thus recovering said audio frequency signal.

Claim 16

The method of recovering a secondary signal which was previously used to generate a modulated signal which modulated signal is carried on a television video signal without reducing the number of synchronizing pulses of said video signal including a step of generating a first clocking signal responsive to synchronizing information of said video signal and generating a second stable clocking signal, a step of sampling said modulated signal in response to said first clocking signal, a step of storing said samples in a memory, a step of removing said samples from said memory in response to said second clocking signal and a further step of filtering said removed samples to recover said secondary signal.

Claim 17

The method of recovering a secondary signal which was previously used to generate a modulated signal which modulated signal is carried on a television video signal without reducing the number of synchronizing pulses of said video signal including a step of generating a first clocking signal responsive to synchronizing information of said video signal and generating a second stable clocking signal, a step of sampling said modulated signal in response to said first clocking signal, a step of storing said samples in a memory, a step of removing said samples from said memory in response to said second clocking signal and a further step of filtering said removed samples to recover said secondary signal.

Claim 19

The method of restoring a continuous secondary signal which has been compressed in time and combined in analog form with a video signal without substantially reducing the number of synchronizing pulses of said video signal including a step of sampling said video signal to produce an intermittent secondary signal, a step of storing said intermittent secondary signal produced by said sampling, a step of continuously retrieving said stored intermittent secondary signal and a step of converting retrieved signals to a continuous analog signal essentially the same as said continuous secondary signal.

Claim 20

The method of restoring a continuous secondary signal which has been compressed in time and combined in analog form with a video signal without substantially reducing the number of synchronizing pulses of said video signal including a step of sampling said video signal to produce an intermittent secondary signal, a step of storing said intermittent secondary signal produced by said sampling, a step of continuously retrieving said stored intermittent secondary signal and a step of converting retrieved signals to a continuous analog signal essentially the same as said continuous secondary signal.

Claim 24

An apparatus for receiving low bandwidth signals transmitted as part of a television signal having a timing pulse and a section without substantive picture related information, the transmission including converting the low bandwidth signals into an intermittent sped up modulated signal related to the timing pulse and including the modulated signal into the section of the television signal without substantive picture related information to be transmitted therewith, said receiving apparatus comprising meas to separate the sped up intermittent modulated signal from the section of the television signal without substantive picture related information, said separation means utilizing the timing pulse of the television signal, and means to reconvert theseparated sped up intermittent modulated signal back into a signal substantially equivalent to the low bandwidth signal.

Claim 25

An apparatus for receiving low bandwidth signals transmitted as part of a television signal having a timing pulse and a section without substantive picture related information, the transmission including converting the low bandwidth signals into an intermittent sped up modulated signal related to the timing pulse and including the modulated signal into the section of the television signal without substantive picture related information to be transmitted therewith, said receiving apparatus comprising meas to separate the sped up intermittent modulated signal from the section of the television signal without substantive picture related information, said separation means utilizing the timing pulse of the television signal, and means to reconvert theseparated sped up intermittent modulated signal back into a signal substantially equivalent to the low bandwidth signal.

Claim 28

An apparatus for receiving a low bandwidth signal transmitted as part of a television signal having a timing pulse and a section without substantive picture related information, the television signal including the low bandwidth signal having sampled at one clock rate, and converted into an analog intermittent signal at a different second clock rate, the intermittent signal having substantially the same information as the low bandwidth signal, the second clock rate being related to the timing pulse of the television signal, and combining the intermittent signal into the section of the television signal without substantive picture related information for transmission with the television signal, said receiving apparatus comprising means to receive the television signal including the intermittent signal, uncombining means to separate the intermittent signal from the television signal, said uncombining means having a clock rate substantially equal to the second clock rate, and means to reconvert the intermittent signal back into a signal substantially equivalent to the low bandwidth signal.

Claim 29

An apparatus for receiving a low bandwidth signal transmitted as part of a television signal having a timing pulse and a section without substantive picture related information, the television signal including the low bandwidth signal having sampled at one clock rate, and converted into an analog intermittent signal at a different second clock rate, the intermittent signal having substantially the same information as the low bandwidth signal, the second clock rate being related to the timing pulse of the television signal, and combining the intermittent signal into the section of the television signal without substantive picture related information for transmission with the television signal, said receiving apparatus comprising means to receive the television signal including the intermittent signal, uncombining means to separate the intermittent signal from the television signal, said uncombining means having a clock rate substantially equal to the second clock rate, and means to reconvert the intermittent signal back into a signal substantially equivalent to the low bandwidth signal.

Claim 31

The apparatus of claims 20 or 21 wherein the television signal has a horizontal sync timing and characterized in that the second clock rate is responsive to the horizontal sync timing of the television signal.