Burst serial tone waveform signaling method and device for squelch/wake-up control of an HF transceiver
First Claim
1. A method of activating a radio receiver that is in a low power consumption sleep mode so that the radio receiver can receive a signal and of determining whether to squelch an audio output from the radio receiver, the method comprising the steps of:
- (a) providing a first serial tone based burst waveform to activate the radio receiver and to deactivate squelch;
(b) providing plural second serial tone based burst waveforms at random times during reception of a signal for maintaining deactivated squelch; and
(c) providing a third serial tone based burst waveform to indicate the end of a signal and to activate squelch.
2 Assignments
0 Petitions
Accused Products
Abstract
A device and method for controlling HF single side band radio squelch operation in which a serial tone burst indicates the start and end of a transmission and identifies an on-going transmission. Additionally, receivers in a power saving sleep mode can be activated by receipt of a set of serial tone bursts that have been transmitted with sufficient duration for the receiver to be assured the opportunity to detect them. During the subsequent transmission of information, single "keep-alive" serial tone bursts are transmitted at random time intervals. The end of a transmission is signalled by another set of serial tone bursts. The bursts are provided with the transmitted signal on its frequency and preserve signal bandwidth.
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Citations
29 Claims
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1. A method of activating a radio receiver that is in a low power consumption sleep mode so that the radio receiver can receive a signal and of determining whether to squelch an audio output from the radio receiver, the method comprising the steps of:
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(a) providing a first serial tone based burst waveform to activate the radio receiver and to deactivate squelch; (b) providing plural second serial tone based burst waveforms at random times during reception of a signal for maintaining deactivated squelch; and (c) providing a third serial tone based burst waveform to indicate the end of a signal and to activate squelch. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of determining whether to squelch or unsquelch an audio output from a radio receiver comprising the steps of:
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(a) providing serial tone bursts in an audio signal transmission received by the radio receiver for controlling the audio output of the receiver, each of the serial tone bursts including a first signal indicating whether to squelch or unsquelch the audio output; (b) evaluating the first signal in each of the serial tone bursts at the radio receiver; and (c) controlling the audio output of the radio receiver responsive to the evaluation. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A radio transmitter comprising:
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a serial tone burst generator for, generating a first serial tone based burst waveform to activate a radio receiver from a sleep mode, said first waveform including a first signal for deactivating squelch at the radio receiver, generating a plurality of second serial tone based burst waveforms after activation of the radio receiver, and generating a third serial tone based burst waveform to indicate the end of a transmission from a transmitter, said third waveform including a second signal for activating squelch at the radio receiver; a logic circuit for instructing said generator to generate one of said first, second, and third waveforms; and a multiplexer for adding said first, second, and third waveforms from said generator to a transmission from said transmitter. - View Dependent Claims (17, 18, 19)
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20. A radio receiver comprising:
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squelch means for muting an audio signal from said receiver; and means for selectively operating said squelch means responsive to serial tone bursts contained within a transmission received by said receiver, said bursts including a first signal indicating whether said squelch means is to mute the audio signal, wherein said means for operating said squelch means mutes the audio signal if a predetermined number of said serial tone bursts are not received within a predetermined period of time.
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21. A radio receiver comprising:
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squelch means for muting an audio signal from said receiver; means for selectively operating said squelch means responsive to serial tone bursts contained within a transmission received by said receiver, said bursts including a first signal indicating whether said squelch means is to mute the audio signal; delay means for delaying a portion of the transmission received by said receiver, and fill means for inserting a preceding audio into the transmission in place of said serial tone bursts.
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22. A method of determining whether to squelch an audio output from a radio receiver, the method comprising the steps of:
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(a) providing a first serial tone based burst waveform to deactivate squelch at the radio receiver; (b) providing a plurality of second serial tone based burst waveforms during reception of a signal for maintaining deactivated squelch; and (c) providing a third serial tone based burst waveform to activate squelch. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification