Integrated short range RDS FM transmitter
First Claim
1. An FM transmitter, comprising:
- a processor configured to identify text data providing ancillary information descriptive of digital audio signal responsive to receiving a data type, to convert the selected text data into digitally encoded speech, and to encode the digital audio signal and the digitally encoded speech according to an FM standard into an FM digital signal responsive to receiving a transmission mode;
a converter configured to convert the FM digital signal into an analog FM signal; and
a transmitter configured to transmit the analog FM signal;
wherein the data type is configured to identify a type of ancillary information that is descriptive of the digital audio signal;
wherein the transmission mode is configured to identify a mode in which to encode the digital audio signal and the digitally encoded speech such that the digitally encoded speech is annunciated after decoding responsive to the transmission mode; and
wherein the processor includes a signal combiner configured to time-division multiplex the digital audio signal and the digitally encoded speech to generate the FM digital signal responsive to the transmission mode.
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Accused Products
Abstract
A low-power, software based modulator that is used to transfer text data from an auxiliary audio device to an FM radio receiver includes a processor that receives the text data to be transmitted to the FM receiver, processes the data as an RDS signal or converts the text data to speech and then combines the processed data signal with an FM audio signal that is sent to the FM receiver. In one embodiment, the auxiliary audio device is a CD or CD-MP3 player and the software-based modulator is implemented on the control processor or DSP of the device. The FM encoder that produces the FM encoded audio signal may be a separate analog encoder or may also be implemented in the control processor of the auxiliary audio device.
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Citations
22 Claims
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1. An FM transmitter, comprising:
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a processor configured to identify text data providing ancillary information descriptive of digital audio signal responsive to receiving a data type, to convert the selected text data into digitally encoded speech, and to encode the digital audio signal and the digitally encoded speech according to an FM standard into an FM digital signal responsive to receiving a transmission mode; a converter configured to convert the FM digital signal into an analog FM signal; and a transmitter configured to transmit the analog FM signal; wherein the data type is configured to identify a type of ancillary information that is descriptive of the digital audio signal; wherein the transmission mode is configured to identify a mode in which to encode the digital audio signal and the digitally encoded speech such that the digitally encoded speech is annunciated after decoding responsive to the transmission mode; and wherein the processor includes a signal combiner configured to time-division multiplex the digital audio signal and the digitally encoded speech to generate the FM digital signal responsive to the transmission mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transceiver, comprising:
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a radio data system (RDS) modulator configured to generate a modulated text data signal modulated as digital RDS signal using a digitized 57 kHz subcarrier in response to receiving text data configured to provide ancillary information descriptive of an audio signal and in response to receiving a data type; a frequency modulation (FM) encoder configured to generate an FM encoded audio signal in response to the audio signal; a signal combiner configured to time-division multiplex the modulated text data signal and the FM encoded audio signal into a combined digital signal in response to a transmission mode; and an FM transmitter configured to transmit the combined digital signal after conversion to a combined analog signal; wherein the data type is configured to identify a type of ancillary information that is descriptive of the audio signal; and wherein the transmission mode is configured to identify a mode in which to combine the audio signal and the modulated text data signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A handheld audio player, comprising:
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a storage device; a processor configured to receive an audio signal, to select text data providing ancillary information descriptive of the audio signal from the storage device responsive to receiving a data type indication, to generate from the selected text data a modulated text data signal including speech encoding of the text data, to combine the modulated text data and the audio signal into a combined audio signal responsive to a transmission mode indication, and to convert the combined audio signal into an FM signal; and a frequency modulation (FM) transmitter configured to transmit the FM signal; wherein the data type is configured to identify a type of ancillary information that is descriptive of the audio signal; wherein the transmission mode is configured to identify a mode in which to combine the modulated text data and the audio signal such that the speech encoding of the text data is annunciated after decoding the FM signal responsive to the transmission mode indication; wherein the processor is configured to convert the text data into digitally encoded speech and to time-division multiplex the digitally encoded speech and the audio signal to generate a combined digital audio signal responsive to the transmission mode indication; wherein a converter is configured to convert the combined digital audio signal into a combined analog audio signal; and wherein the FM transmitter is configured to transmit the combined analog audio signal. - View Dependent Claims (22)
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Specification