Communication system, transmitting device, receiving device and communication method

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

Inactive Publication Date: 2016-09-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment Construction

[0033] Hereinafter, a communication system according to an 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 constituted by a microphone device functioning as a transmitting device and a speaker device functioning as a receiving device. In this communication system, audio signals of a wide frequency band (audio frequency band of 100 Hz to 15 kHz) are transmitted and received. In addition, in the following description, the case of a broadband audio signal (100 Hz to 15 kHz) will be described as an example, but it can also be implemented in a case where there is no lower limit (to 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 described. figure 1 It i...

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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 invention relates to a communication system for transmitting and receiving wideband audio signals, in particular to a technology for improving conversation privacy. Background technique [0002] A communication system for transmitting and receiving audio signals in a narrow frequency band including only the audio frequency band (300 Hz to 3 kHz) is used in a transceiver, a home cordless phone, and the like. Conventionally, as a technique for relatively inexpensively realizing call privacy using such a narrow-band communication system, a method has been proposed in which balanced modulators are provided at both the transmitter and receiver, and the frequency is reversed after transmission on the transmitter side. The received audio signal is reversed again on the receiver side to restore it (for example, refer to Patent Document 1 and Patent Document 2). [0003] According to this conventional method, even if an audio signal transmitted from a tran...

Claims

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Application Information

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