Multiband short range radio receiver for motor vehicle data

• US 6,965,757 B2
• Filed: 05/01/2001
• Issued: 11/15/2005
• Est. Priority Date: 05/04/2000
• Status: Expired due to Fees

• Current Assignee: Johnson Controls Automotive Electronic (Johnson Controls International plc)
• Original Assignee: Johnson Controls Automotive Electronic (Johnson Controls International plc)
• Inventors: Eray, Yves
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): LE, LANA N
• Application Number:
  US09/846,909
• Publication Number:
  US 20010039185A1
• Time in Patent Office: 1,659 Days
• Field of Search: 455/152.1, 455/151.2, 455/352, 455/92, 455/151.3, 455/353, 455/188.1, 455/255, 455/189.1, 455/318, 455/190.1, 455/180.1, 455/163, 340/825.22, 340/825.69, 340/825.31, 340/825, 340/310.01, 340/426.36, 340/825.72, 340/5.2, 340/5.64
• US Class Current: 455/151.2
• CPC Class Codes: H04B 1/28 the receiver comprising at least one semiconductor device having three or more electrodes
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

The short range radio receiver for motor vehicle data comprises antenna circuits (1–4) connected to a unit (10–15) for processing a carrier in a plurality of specific frequency bands which is modulated by a data signal, the unit (10–15) comprising frequency-transposing circuits (11, 23–28) connected to demodulation circuits (13) supplying the demodulated data, and frequency discrimination circuits (21, 22) are provided, connected to the antenna circuits (1–4), to determine respective reception levels within the bands in order to compare them with each other and to control the frequency transposing circuits (11, 23–28) depending on the result of the comparison.

Claims

1. Short range radio receiver for motor vehicle data, comprising antenna means (1–

4) connected to a unit (10–

15) for processing a received carrier in a specific band of frequencies which is modulated by a data signal, the unit (10–

15) comprising means (11, 23–

28) for frequency transposition of the carrier, which are connected to means (13) for demodulating the transposed carrier, which are arranged to supply the demodulated data, the receiver being characterised in that the antenna means (1–

4) are arranged to receive a plurality of frequency bands, and that frequency discrimination means (21, 22) are provided, connected to the antenna means (1–

4), arranged to determine respective reception levels within the bands in order to compare them with each other and to control the frequency transposing means (11, 23–

28) depending on the result of the comparison.

2. Receiver according to claim 1, wherein the frequency transposing means comprise a slave loop (24–

27) of a slave oscillator (27) with respect to a master oscillator (23).

3. Receiver according to claim 2, wherein the slave loop (24–

27) comprises a phase comparator (24) connected to the two oscillators (23, 27) by two respective inputs, with an adjustable frequency-changing circuit (25) interposed on one of the inputs and arranged to be controlled by the discriminator means (21, 22).

4. Receiver according to claim 2, wherein the loop (24–

27) controls a mixer (11) for transposing the frequency of the received signal via a frequency divider (28) arranged to be controlled by the discriminator means (21, 22).

5. Receiver according to claim 2, wherein the master oscillator (23) is arranged so that its frequency is controlled by the discriminator means (21, 22).

6. Receiver according to claim 1, wherein the discriminator means (21, 22) comprise two frequency-shifted band-pass filters (211, 212) connected to the inputs of a comparator (213) for selecting the frequency band.

7. Receiver according to claim 6, wherein the comparator (213) comprises, at its input, two noise-eliminating threshold circuits.

8. Receiver according to claim 7, wherein the comparator (213) comprises a circuit for at-rest priority polarisation of one of its inputs with respect to the other.