A receiving device of the present disclosure includes: a first processor that (i) receives a broadcast signal obtained by modulating multiplexed data including at least first multiplexed data in a first multiplexing format, out of the first multiplexed data and second multiplexed data in a second multiplexing format different from the first multiplexing format, (ii) demodulates the broadcast signal received, and (iii) outputs the multiplexed data obtained as a result of the demodulation; and a converter that (i) converts, into the second multiplexing format, a multiplexing format of the first multiplexed data included in the multiplexed data that has been output, and (ii) outputs converted data obtained as a result of the conversion.

A receiving device of the present disclosure includes: a first processor that (i) receives a broadcast signal obtained by modulating multiplexed data including at least first multiplexed data in a first multiplexing format, out of the first multiplexed data and second multiplexed data in a second multiplexing format different from the first multiplexing format, (ii) demodulates the broadcast signal received, and (iii) outputs the multiplexed data obtained as a result of the demodulation; and a converter that (i) converts, into the second multiplexing format, a multiplexing format of the first multiplexed data included in the multiplexed data that has been output, and (ii) outputs converted data obtained as a result of the conversion.

A method for processing audio signals in a radio transmitter, includes: receiving an analog audio sample stream and a digital audio sample stream; determining offsets in time between the analog audio stream and the digital audio stream using a normalized cross-correlation of audio envelopes of the analog audio sample stream and the digital audio sample stream; filtering the determined offsets in time to produce filtered offset values; determining an alignment slip adjustment value as a function of the filtered offset values; aligning the analog audio sample stream and the digital audio sample stream using the determined alignment slip adjustment value; and generating a hybrid radio signal for broadcast that includes time-aligned analog audio and digital audio.

A method for processing audio signals in a radio transmitter, includes: receiving an analog audio sample stream and a digital audio sample stream; determining offsets in time between the analog audio stream and the digital audio stream using a normalized cross-correlation of audio envelopes of the analog audio sample stream and the digital audio sample stream; filtering the determined offsets in time to produce filtered offset values; determining an alignment slip adjustment value as a function of the filtered offset values; aligning the analog audio sample stream and the digital audio sample stream using the determined alignment slip adjustment value; and generating a hybrid radio signal for broadcast that includes time-aligned analog audio and digital audio.

A method and system for the transmission of digital data (210) over existing analog radio frequencies (230) is presented, wherein the digital data may include audio data, visual data or audio-visual data for presentation either with analog broadcast data or at a selectable time. The digital data may be transmitted over a plurality of sub-channels that have varying degrees or reliability (250). A quality-of-service process manages the transmission of digital data over various sub-channels based on the reliability of the sub-channel, the amount of digital data and the type of digital data to be transmitted. The digital data may further be encrypted and authenticated.

A method and system for the transmission of digital data (210) over existing analog radio frequencies (230) is presented, wherein the digital data may include audio data, visual data or audio-visual data for presentation either with analog broadcast data or at a selectable time. The digital data may be transmitted over a plurality of sub-channels that have varying degrees or reliability (250). A quality-of-service process manages the transmission of digital data over various sub-channels based on the reliability of the sub-channel, the amount of digital data and the type of digital data to be transmitted. The digital data may further be encrypted and authenticated.

A receiving device of the present disclosure includes: a first processor that (i) receives a broadcast signal obtained by modulating multiplexed data including at least first multiplexed data in a first multiplexing format, out of the first multiplexed data and second multiplexed data in a second multiplexing format different from the first multiplexing format, (ii) demodulates the broadcast signal received, and (iii) outputs the multiplexed data obtained as a result of the demodulation; and a converter that (i) converts, into the second multiplexing format, a multiplexing format of the first multiplexed data included in the multiplexed data that has been output, and (ii) outputs converted data obtained as a result of the conversion.

A receiving device of the present disclosure includes: a first processor that (i) receives a broadcast signal obtained by modulating multiplexed data including at least first multiplexed data in a first multiplexing format, out of the first multiplexed data and second multiplexed data in a second multiplexing format different from the first multiplexing format, (ii) demodulates the broadcast signal received, and (iii) outputs the multiplexed data obtained as a result of the demodulation; and a converter that (i) converts, into the second multiplexing format, a multiplexing format of the first multiplexed data included in the multiplexed data that has been output, and (ii) outputs converted data obtained as a result of the conversion.

A radio transmitter comprises transmitting circuitry and processing circuitry. The transmitting circuitry broadcasts a frequency modulation (FM) in-band on-channel (IBOC) radio signal, wherein the FM IBOC radio signal includes multiple subcarriers grouped into multiple frequency partitions. The processing circuitry is configured to receive input bits for transmitting; encode and puncture the input bits using forward error correction (FEC) encoding; distribute encoded input bits between a main encoded component and a backup encoded component, wherein encoded bits of the backup encoded component are delayed for a specified duration relative to encoded bits of the main encoded component; allocate the encoded input bits of the main and backup encoded components into frequency diverse sidebands of the FM IBOC radio signal; and modulate the encoded input bits for transmitting using the frequency diverse sidebands of the FM IBOC radio signal, wherein the modulation is a type of quadrature amplitude modulation (QAM).

Systems and methods are provided for broadcasting a signal. A multiplexer combines a first signal from a first signal source and a second signal from a second signal source as a time divisional multiplexed signal and provides a timing signal, distinct from the time division multiplexed signal, that indicates, for a given time, from which of the first and the second signal source a corresponding portion of the time divisional multiplexed signal originated. A signal conditioning component receives each of the time divisional multiplexed signal and the timing signal and alters the time division multiplexed signal in a manner that prepares the signal for broadcast. The signal conditioning component dynamically alters its behavior according to the timing signal. An antenna transmits the time division multiplexed signal.