Transmitter of infrared transmission system and reproducing apparatus comprising headphone device
First Claim
1. A transmitting apparatus comprising:
- a memory adapted to temporarily write digital audio signals inputted thereto to repeatedly implement time axis compression processing, every unit time period, to the digital audio signals thus written to write and read them for a second time;
a compression circuit for implementing compression to the digital audio signal which has been read out from the memory;
a modulation circuit for carrying out modulation of the compressed digital audio signal; and
an infrared light emitting element for converting a modulated signal outputted from the modulation circuit into infrared rays.
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Accused Products
Abstract
This invention is directed to a transmitting apparatus adapted for carrying out transmission of audio signals by using infrared rays and a reproducing apparatus using a headphone device adapted to receive audio signals transmitted from the transmitting apparatus to reproduce them. The transmitting apparatus allows digital audio signal to undergo time axis compression every unit time period, and to repeat the same contents to transmit such repetitive signals by infrared rays. The headphone device comprises a light receiving element for receiving infrared rays, and a memory adapted so that valid signals of the received repetitive signals are written thereinto and the written signals are caused to undergo time axis expansion and are read out therefrom to allow the signals which have been read out from the memory to undergo D/A conversion to deliver the signals thus obtained to speaker units of the headphone device to reproduce them.
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Citations
8 Claims
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1. A transmitting apparatus comprising:
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a memory adapted to temporarily write digital audio signals inputted thereto to repeatedly implement time axis compression processing, every unit time period, to the digital audio signals thus written to write and read them for a second time; a compression circuit for implementing compression to the digital audio signal which has been read out from the memory; a modulation circuit for carrying out modulation of the compressed digital audio signal; and an infrared light emitting element for converting a modulated signal outputted from the modulation circuit into infrared rays. - View Dependent Claims (2, 3, 4)
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5. A reproducing apparatus provided with a headphone device comprising:
- a memory adapted to temporarily write digital audio signals inputted thereto to repeatedly implement time axis compression processing, every unit time period, to the digital audio signals written to write and read them for a second time;
a modulation circuit for carrying out modulation of the digital audio signal which has been read out from the memory; and an infrared light emitting element for converting a modulated signal outputted from the modulation circuit into infrared rays, the reproducing apparatus comprising; a light receiving element for receiving the infrared ray; a demodulation circuit for demodulating the modulated signal outputted from the light receiving element to output a compressed digital audio signal; an expansion circuit for implementing expansion processing to the compressed digital audio signal for restoration to a digital audio signal which has not undergone compression processing; a memory for allowing the digital audio signal outputted from the expansion circuit to be repetitive signals to which time axis compression has been implemented every unit time to write signals of unit time period, and to implement thereto time axis expansion processing and defect correction processing of unit time period to carry out write and read operations thereof; a D/A converter circuit for allowing the digital audio signal which has been read out from the memory to undergo D/A conversion output an analog audio signal; and an electroacoustic conversion unit supplied with the analog audio signal outputted from the D/A converter. - View Dependent Claims (6, 7, 8)
- a memory adapted to temporarily write digital audio signals inputted thereto to repeatedly implement time axis compression processing, every unit time period, to the digital audio signals written to write and read them for a second time;
Specification