![]() However, the howler signal is much higher in level than a voice signal so that, for example, when a frequency-modulated (FM) signal is used as carried on the radio line, the direct transmission of the howler signal causes the level of the howling signal received at the mobile device to become remarkably low due to the limitation of the maximum frequency shift, thus disabling the sufficient informing function. In the prior art system, the howler signal is transmitted to the mobile device from the master device. ![]() In addition, when the line of the mobile device is cut off on the side of the master device, since the mobile device is left in its OFF-HOOK state, it becomes disadvantageously impossible to sound the mobile device at the time of receiving a new signal. However, even when such indication of prompting the ON-HOOK action of the mobile device is provided on the side of the master device, it is disadvantageously impossible for the operator by the mobile device to know the indication so long as the mobile device is located away from the master device. H04M3/14- Signalling existence of persistent "off-hook" conditionĪ conventional cordless telephone system of the type referred to has been arranged so that when the mobile device is left in its OFF-HOOK state, a howler signal is applied from a switchboard through a general subscriber's line to the master device to warn the operator of the OFF-HOOK state of the mobile device, in which case the master device does not transmit the howler signal through the radio line to the mobile device but flashes a light emitting element LED or gives an alarm sound in accordance with the howler signal on the side of the master device to prompt the operator to hook on the mobile device or cut off the line of the mobile device.H04M3/08- Indicating faults in circuits or apparatus.H04M3/00- Automatic or semi-automatic exchanges.H04M1/724- User interfaces specially adapted for cordless or mobile telephones.devices for establishing wireless links to base stations without route selection H04M1/72- Mobile telephones Cordless telephones, i.e.H04M1/82- Line monitoring circuits for call progress or status discrimination.230000005540 biological transmission Effects 0.000 description 7.238000001514 detection method Methods 0.000 claims abstract description 11.Assignors: TOKI, AKIO, UMEMOTO, YUJI Application granted granted Critical Publication of US4788712A publication Critical patent/US4788712A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links OF DE reassignment BAXTER TRAVENOL LABORATORIES, INC., A CORP. ![]() Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to JP61201550A priority Critical patent/JPS6359123A/en Priority to JP61-201550 priority Application filed by Toshiba Corp filed Critical Toshiba Corp Assigned to BAXTER TRAVENOL LABORATORIES, INC., A CORP. Original Assignee Toshiba Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/090,515 Inventor Yuji Umemoto Akio Toki Current Assignee (The listed assignees may be inaccurate. Google Patents Howler indicator in cordless telephone systemÄownload PDF Info Publication number US4788712A US4788712A US07/090,515 US9051587A US4788712A US 4788712 A US4788712 A US 4788712A US 9051587 A US9051587 A US 9051587A US 4788712 A US4788712 A US 4788712A Authority US United States Prior art keywords howler signal mobile device indicator telephone system Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4788712A - Howler indicator in cordless telephone system US4788712A - Howler indicator in cordless telephone system ![]()
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