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Communication system, transmitting apparatus, receiving apparatus and communication method

A technology of a sending device and a receiving device, applied in the field of communication systems, can solve problems such as inability to ensure the privacy of calls, and achieve the effect of improving the privacy of calls

Inactive Publication Date: 2012-10-24
PANASONIC CORP
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Therefore, when the audio signal transmitted from the transmitter is received by another receiver (receiver without a balanced modulator), the low-frequency side of the balanced-modulated audio signal has fewer components other than "leakage audio" , as a result, "leaking audio" becomes easy to listen to, and there is a problem that the privacy of the call cannot be ensured

Method used

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  • Communication system, transmitting apparatus, receiving apparatus and communication method
  • Communication system, transmitting apparatus, receiving apparatus and communication method
  • Communication system, transmitting apparatus, receiving apparatus and communication method

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Embodiment Construction

[0033] Hereinafter, the communication system according to the embodiment of the present invention will be described with reference to the drawings. In this embodiment, a case where it is used in a communication system such as a wireless microphone system is exemplified. The communication system of this embodiment is composed of a microphone device having a function as a transmitting device and a speaker device having a function as a receiving device. In this communication system, a wide frequency band (audio frequency band of 100 Hz to 15 kHz) is transmitted and received. In addition, in the following description, the case of a wide-band audio signal (100 Hz to 15 kHz) will be described as an example, but the same can be implemented even when there is no lower limit (-15 kHz).

[0034] First, refer to figure 1 as well as figure 2 The configuration of the communication system according to the embodiment of the present invention will be explained. figure 1 It is a block diagram s...

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Abstract

The present invention provides a communication system, a transmitting apparatus, a receiving apparatus and a communication method. In a broad frequency band audio communication system, the audio level of the audio leakage output from a receiving apparatus can be reduced, thereby increasing the communication privacy. The communication system is formed by a microphone apparatus (1) as a transmitting apparatus and a loudspeaker apparatus (15) as a receiving apparatus; when road frequency band audio signals are input, the microphone apparatus (1) performs balancing modulation processing enabling frequency anti-clockwise rotation of the audio signals, and in a frequency band lower than a reference frequency in the audio signals undergone frequency anti-clockwise rotation, DCS signals or motion signals are laminatedly transmitted; and when audio signals transmitted from the microphone apparatus (1) are received, the loudspeaker apparatus (15) reduces the signals in a frequency band lower than the reference frequency in the received audio signals, performs inverted balancing modulation processing enabling re-anticlockwise rotation of the frequency of the audio frequency signals, and outputs the audio signals after the re-anticlockwise rotation of frequency.

Description

Technical field [0001] The present invention relates to a communication system for transmitting and receiving broadband audio signals, and in particular to a technology for improving the privacy of a call. Background technique [0002] In radio transceivers, home cordless phones, etc., communication systems that transmit and receive narrow-band audio signals including only the audio frequency band (300 Hz to 3 kHz) are used. In the past, as a technology that uses such a narrow-band communication system to realize call privacy at a relatively low cost, the following method has been proposed: a balanced modulator is installed on both the transmitter and the receiver, and the frequency is inverted after transmission on the transmitter side. The received audio signal is inverted again on the receiver side and restored (for example, refer to Patent Document 1 and Patent Document 2). [0003] According to this existing method, even if an audio signal sent from a transmitter is received ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04K1/04
Inventor 川崎裕二
Owner PANASONIC CORP
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